DIY_EFI Digest Thursday, 11 March 1999 Volume 04 : Number 157 In this issue: diesel home dyno RE: AutoMeter (Aluminum or Platinum???) Re: AutoMeter (Aluminum or Platinum???) Re: Wiring harness for late model GM trucks Re: AutoMeter (Aluminum or Platinum???) Fwd: Recommend an a/f meter? Re: Wiring harness for late model GM trucks Dangerous injection ideas... EFI in a boat 3800 supercharged, please read! Re: Recommend an a/f meter? Re: MAP Q? Re: Dangerous injection ideas... Re: AutoMeter (Aluminum or Platinum???)Found Low cost EGT RE: ProJection mods, was Re: New to list, have a question. Re: ProJection mods, was Re: New to list, have a question. Re: Harnesses O2 sensor Re: 3800 supercharged, please read! Re: AutoMeter (Aluminum or Platinum???) Re: O2 sensor Re: AutoMeter FP gauge response time re: EGT gauges and thermocouples Suggestions on altitude compensation for mechanical FI system wanted... Fuel managment system See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: xxalexx@xxx.com Date: Wed, 10 Mar 1999 17:19:33 +0000 Subject: diesel home dyno Mar 4, 99 Design News has rpm sensor that uses a piezoelectric sensor and a alligator clip attached to fuel line. Scope trace shows shows other cylinders. Circuit uses a ICL7611 charge amp. alex ------------------------------ From: Roger Heflin Date: Wed, 10 Mar 1999 16:35:44 -0600 (CST) Subject: RE: AutoMeter (Aluminum or Platinum???) On Wed, 10 Mar 1999, Jeray, Rick wrote: > I use the Cyberdyne gage, it does respond slow but its good enough to set > up my TBI pressure. > It displays 0-30 psi in .2 increments, might not be enough for MPI. Its > digital and rectangular. > > I think the issue with it is that the blowers and N2O kits gneerally work by boosting (significantly) the fuel pressure, and that is how they get more fuel into the engine, and the gage apparently does not respond fast enough to this boosting of the fuel pressure. I think stock the f-bodies run 45 psi, and I have heard of the kits boosting the pressure up to 60psi or more, and this is all at the same rate as the rpm is rising (for a blower). It may be less of a problem in a N2O car since it should only boost once, and then stay steady, where in the blower the pressure is rising at a fairly rapid rate, with rpm (rising boost). Roger ------------------------------ From: xxalexx@xxx.com Date: Wed, 10 Mar 1999 17:38:57 +0000 Subject: Re: AutoMeter (Aluminum or Platinum???) Aircraft gauges can or used to be found surlpus. Response can depend on ground. sheath ground is faster. You could try a ceramic protection tube, if you have a smooth engine. alex > >Dan, > > > > I feel your pain, man. I don't think you're expecting too much for too > >little, either. Autometer is definitely trying to act like microsoft lately. > >There is a sliver of hope, though. Cyberdyne advertises an electric fp gauge > >with sender for under $80; the downside, it's digital and looks a little > >cheesy, but fits the 2 1/16" holes, I think. Not sure which, Jegs or Summit > >carries it. As far as the egt, I don't know. > > > >Daniel > > Try Barry Grant for the EGT--dunno their price, but always good stuff there. > > Any T/C with the same letter code ("K" , for instance) will interchange. > The letter code designates the metal pairing. The trick with EGT T/C probes > is to combine RUGGED with low mass (for quick response). These two > qualities may not happen in the same piece for cheap. > > Regards, Greg > > > > > > > ------------------------------ From: Shannen Durphey Date: Wed, 10 Mar 1999 17:43:43 -0500 Subject: Re: Wiring harness for late model GM trucks If someone finds more complete info please post. My source says they're some type of forward lamp harnesses for P chassis vehicles, 1990-94. Shannen Ken Kelly wrote: > > Eugene, > I would like to look at that harness add! I bought a > harness at Carlisle that sounds like it might be the same. > It was sold by a tool dealer that had at least 100 of them. > On Thursday they were $50, I bought it on Sat for $25. It is > a Chassis wiring harness, not an Engine harness. I haven't > used it yet, but was planning to use it in a street rod. It > has a GM fuseblock with the 1980's style spade fuses, not > the minature 1990's style spade fuse. It has a lot of > cabling and plugs attached, but I haven't even opened it out > yet. > > Ken > > Eugene Jones wrote: > > > > ---------- > > > From: Jim Yeagley > > > To: diy_efi@xxx.edu > > > Subject: Wiring harness for late model GM trucks > > > Date: Tuesday, March 09, 1999 8:56 PM > > > > > > I found this in my browsing: > > > > > > Manufacturer's overstock buyout on wiring harness assemblies for late > > model > > > GM trucks, busses, vans and RV's. These harnesses are priced at pennies > > on > > > the dollar compared to original distributor cost ! MFG P/N: 12069696, and > > > also MFG P/N: 12069591 > > > > > > > > > Does anyone know if one of these will work with that 7747? > > > > > > > > Jim > > Please send info on where to purchase these, I'm interested in one now !! > > thanks much. > > Eugene Jones > > jtvette@xxx.net ------------------------------ From: "Clarence L.Snyder" Date: Wed, 10 Mar 1999 18:30:54 -0500 Subject: Re: AutoMeter (Aluminum or Platinum???) What about Westach? I have 2" singles listed at $130 canadian, duals at $230, standard probes at $60 and quick response at $70 ------------------------------ From: Jeff Moskovitz Date: Wed, 10 Mar 1999 15:40:25 -0800 Subject: Fwd: Recommend an a/f meter? I've been a lurker on this list for some time, but I finally have a question: could someone on the list recommend a good/cheap a/f meter setup that uses a wide band EGO, and possible a good source for same? TIA, Jeff ------------------------------ From: "Bruce Plecan" Date: Wed, 10 Mar 1999 18:44:36 -0500 Subject: Re: Wiring harness for late model GM trucks - -----Original Message----- From: Shannen Durphey To: diy_efi@xxx.edu> Date: Wednesday, March 10, 1999 6:14 PM Subject: Re: Wiring harness for late model GM trucks I got one of each coming, they say they got lots of them Bruce >If someone finds more complete info please post. My source says >they're some type of forward lamp harnesses for P chassis vehicles, >1990-94. >Shannen > >Ken Kelly wrote: >> >> Eugene, >> I would like to look at that harness add! I bought a >> harness at Carlisle that sounds like it might be the same. >> It was sold by a tool dealer that had at least 100 of them. >> On Thursday they were $50, I bought it on Sat for $25. It is >> a Chassis wiring harness, not an Engine harness. I haven't >> used it yet, but was planning to use it in a street rod. It >> has a GM fuseblock with the 1980's style spade fuses, not >> the minature 1990's style spade fuse. It has a lot of >> cabling and plugs attached, but I haven't even opened it out >> yet. >> >> Ken >> >> Eugene Jones wrote: >> > >> > ---------- >> > > From: Jim Yeagley >> > > To: diy_efi@xxx.edu >> > > Subject: Wiring harness for late model GM trucks >> > > Date: Tuesday, March 09, 1999 8:56 PM >> > > >> > > I found this in my browsing: >> > > >> > > Manufacturer's overstock buyout on wiring harness assemblies for late >> > model >> > > GM trucks, busses, vans and RV's. These harnesses are priced at pennies >> > on >> > > the dollar compared to original distributor cost ! MFG P/N: 12069696, and >> > > also MFG P/N: 12069591 >> > > >> > > >> > > Does anyone know if one of these will work with that 7747? >> > > >> > > >> > Jim >> > Please send info on where to purchase these, I'm interested in one now !! >> > thanks much. >> > Eugene Jones >> > jtvette@xxx.net > ------------------------------ From: Vinnie Moscaritolo Date: Wed, 10 Mar 1999 15:48:37 -0800 Subject: Dangerous injection ideas... At 12:27 AM -0500 3/10/99, "Bill the arcstarter" wrote: > > I've seen comments about the Holley TBI heads. You can buy this unit > as a replacement part for about $289 or so. There is also a similar > unit w/o an AIV motor (air stepper). Anyone know if I can get the > proper wiring connectors to fit one of these TBIs? If you mean the injector connectors, they are not WeatherPack. Typical Holley, they used non-standard parts. I am curious myself where to get them since I am building a custom harness. The TPS is however a three pin WeatherPack and you can get them from Summit (as a Painless wiring part). Incidentally, WeatherPack's are made by (Delphi Automotive) Packard Electrics special product division there is info on the parts at http://www.delco.com/pdf/packardpdfs/weatherpkds.pdf good luck Vinnie Moscaritolo http://www.vmeng.com/vinnie/ PGP: 3F903472C3AF622D5D918D9BD8B100090B3EF042 - ------------------------------------------------------- Those who hammer their swords into plows, will plow for those who don't." ------------------------------ From: NIls =?iso-8859-1?Q?Bj=F6rkman?= Date: Thu, 11 Mar 1999 01:26:38 +0100 Subject: EFI in a boat Hi I´m pretty new on this list I have been thinking of implementing EFI on my boat engine for a while now I wonder if there are anyone with experiance of EFI on engines for boats. Im planing to design my own EFI based on an PIC16C74A microcontroller. Im pretty familiar whith that and have all nesessary equipment and experience to make the design and program. My boat is a 20 ft long hardtop boat at aprox 1 ton. Engine is Volvo Penta AQ145. It´s a 2.3 liter, 4cylinders. aprox 145 hp, dual solex carbs, overhead camshaft. To day the top speed is 25 knots at 5500 rpm, but it takes LONG time to get there. I hope to be able to move the torque curve a bit downwards so it will accelerate in a more sufficient way. I know I have to experiment with different camshafts and so on to get what I want from the engine. Best regards Nisse ------------------------------ From: "Kevin" Date: Wed, 10 Mar 1999 19:25:29 -0500 Subject: 3800 supercharged, please read! This is a multi-part message in MIME format. - ------=_NextPart_000_0004_01BE6B2B.C1CC25A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi all.. the question I pose is a tough one I believe. I own a 1988 buick Lesabre T-type with a 3800 series I in it.=20 I am changing the engine for a 1997 3800 series II supercharged.=20 What I would like to do is run the motor off of the stock computer. I = figure what I need to change is the prom, or the information on it = anyways.=20 I think I already got the correct binary image of my prom from one of = the link sites.. but I would like to get an image of the 1997 grand prix = GTP codes.. so that I can program mine the same.. any other suggestions = on reprogramming the unit? or should it just run ok off the stock = motor? Somone else I know has done this swap... with success.. but he hasn't = touched the computer yet.. he say's it's running fine however the check = engine soon light has been on since the swap. I'm sure things like the = BLM #'s, and spark advance are different.. please email me with any help = you might have, thanks again Kevin - ------=_NextPart_000_0004_01BE6B2B.C1CC25A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
  Hi=20 all.. the question I pose is a tough one I believe.
 
I own a 1988 buick Lesabre T-type with a 3800 series = I in it.=20
I am changing the engine for a 1997 3800 series II=20 supercharged.
What I would like to do is run the motor off of the = stock=20 computer. I figure what I need to change is the prom, or the information = on it=20 anyways.
I think I already got the correct binary image of my prom = from one=20 of the link sites.. but I would like to get an image of the 1997 grand = prix GTP=20 codes.. so that I can program mine the same.. any other suggestions on=20 reprogramming the unit? or should it just run  ok off the stock=20 motor?
 
Somone else I know has done this swap... with = success.. but he=20 hasn't touched the computer yet.. he say's it's running fine however the = check=20 engine soon light has been on since the swap. I'm sure things like the = BLM #'s,=20 and spark advance are different.. please email me with any help you = might have,=20 thanks again
 
Kevin
- ------=_NextPart_000_0004_01BE6B2B.C1CC25A0-- ------------------------------ From: "Bruce Plecan" Date: Wed, 10 Mar 1999 19:35:18 -0500 Subject: Re: Recommend an a/f meter? - -----Original Message----- From: Jeff Moskovitz To: DIY_EFI@xxx.edu> Date: Wednesday, March 10, 1999 6:53 PM Subject: Fwd: Recommend an a/f meter? Boy ya hear of one, let me know Bruce >I've been a lurker on this list for some time, but I finally have a >question: could someone on the list recommend a good/cheap a/f meter >setup that uses a wide band EGO, and possible a good source for same? > >TIA, > >Jeff > ------------------------------ From: Tom Sharpe Date: Wed, 10 Mar 1999 19:31:57 -0600 Subject: Re: MAP Q? Jason wrote: > < run pretty high boost, so I need a sensor that can cope with 2 bar > boost. > Do anyone know of a good source for these. Is the sensor from > electromotive or haltech any good? Are there cheaper alternatives?>> Digi-key pg 560 Sensym 1-30/100 0-5V $47.70Digi-key pg 558 Lucas 0-30/50/100psi 0-100mv $17.00 Tom S ------------------------------ From: "Jeffrey T. Birt" Date: Wed, 10 Mar 1999 19:26:59 -0600 Subject: Re: Dangerous injection ideas... You can use the acetylene regulator with propane. They are chemmically compatable as far as the gases are concerned. I would not reccomend trying to modify such a unit and use it in an application where it could get oily or greasy. The regulator and oil\grease don't mix. I work for a welding equipment supply\service company and have heard of several horrer stories from our apparatus repair people. Jeff Birt Bill the arcstarter wrote: > OK - now I'm dangerous. > Just ordered a linear actuator stepper motor from C&H surplus. Also > got an acetylene regulator and a shaft encoder. > > I'm thinking about building some sort of DIY-EFI propane system. Am > planning on using the linear stepper motor to replace the pressure > adjustment of the acet. regulator to dispense propane into the test > engine. I think I can get away with using an acetylene regulator with > propane. Anyone think otherwise? I know the pressures are similar and > I also think that chemically they call for the same/similar type of > hosing too. But I may be wrong. > > If I stay with propane I'll probably start out with using the riding > lawn mower as proof of concept. Then I'll think about converting it to > gas (or maybe not) and putting it on in lieu of the shagged Q-jet on the > 350. > > So if Holley can build a system which computes (via lookup table) an > injection volume as a function of engine rpm and TPS - well I bet I can > too. > > I'm thinking about using one PIC processor to manage this stepper > motor, and another to read rpm/tps, do the table stuff and feed the > final "fuel amt" to the 1st PIC. A serial EEPROM device will contain > the output mapping. You can get single eeprom parts, 8 pin ICs with up > to 32Kbytes of memory. Thats one heck of a lookup table. > > TBD is how/if I'll arrange for the hacking/massaging of this table. > Comments anyone? > > I've seen comments about the Holley TBI heads. You can buy this unit > as a replacement part for about $289 or so. There is also a similar > unit w/o an AIV motor (air stepper). Anyone know if I can get the > proper wiring connectors to fit one of these TBIs? > > I'm also wondering if I should go with some sort of MAP sensor instead > of the tps, and just use tps for accel pump stuff... > > Anyone have any clues as to some minimum resolution of these lookup > tables? I know that the GM ECUs use a megar table, something like 4x4 > or so. Anyone also know a minimum precision of the output of this table > - ie 8 or 16 bits? Thanks and wish me luck! > > Comments invited. > -Bill > > > Get Your Private, Free Email at http://www.hotmail.com ------------------------------ From: AL8001@xxx.com Date: Wed, 10 Mar 1999 20:59:56 EST Subject: Re: AutoMeter (Aluminum or Platinum???)Found Low cost EGT Pegasus Auto Racing Supplies 1-800-688-6946 www.execpc.com/~pegasus Single EGT guage for $50. Dual needle guage is $ 86. Thermocouple probe ( attached to a hose clamp, drill a 3/16 hile in the header pipe) with 44" of armored cable is $ 42. Extension cables are 4, 6 , 8 Ft $10 to $12. Four position switch with 8 ft wires $ 33. The brand is unknown. I've bought lots of stuff from Pegasus over the years and they allways have had good products. They deal mostly in open wheel road race and some sedan RR stuff. Harold ------------------------------ From: andy quaas Date: Wed, 10 Mar 1999 18:15:35 -0800 (PST) Subject: RE: ProJection mods, was Re: New to list, have a question. No gots. I sold the whole setup to someone and i gave it to them. The traces were shot, big time. They were burnt worse than any i have seen before. The inside of my truck actually smoked up! Andy - ---"Van Setten, Tim (AZ75)" wrote: > > > > > ---------- > > From: andy quaas[SMTP:realsquash@xxx.com] > > Reply To: diy_efi@xxx.edu > > Sent: Tuesday, March 09, 1999 2:40 PM > > To: diy_efi@xxx.edu > > Subject: Re: ProJection mods, was Re: New to list, have a question. > > > > I used to have a 4Di on my truck, then the IAC wires shorted to the > > intake manifold, then the IAC driver chip burned out on the ECM, > > taking with it traces that run the injector drivers. > > Andy > > efi@xxx.com > > realsquash@xxx.com > > > Andy, do you still have that unit? Maybe it's fixable.......Tim. > _________________________________________________________ DO YOU YAHOO!? Get your free @xxx.com ------------------------------ From: andy quaas Date: Wed, 10 Mar 1999 18:17:28 -0800 (PST) Subject: Re: ProJection mods, was Re: New to list, have a question. I do have them, but this SAP project at work is taking all of my time! Andy - ---cloud@xxx.edu wrote: > > At 01:40 PM 3/9/99 -0800, Andy Quaas wrote: > >The website is www.genevaonline.com/~efi > > > >I haven't updated it in a long time, but all file should still be > >there in www.genevaonline.com/~efi/files > > you don't have the analog PJ files I sent you ??? (nope, feelings not > hurt, just noting that they're not there ??) > > > Tom Cloud > _________________________________________________________ DO YOU YAHOO!? Get your free @xxx.com ------------------------------ From: "Jim Yeagley" Date: Wed, 10 Mar 1999 20:29:50 -0500 Subject: Re: Harnesses > >>I got someone looking to find out what the part no.s fit. >>GM uses lots of harnesses, ie headlight harness, dash >>harness etc.. >>Bruce >> > I guess I didn't think about that. I just caught the key words and got overly excited! Jim ------------------------------ From: cwagner@xxx.net Date: Wed, 10 Mar 1999 20:14:53 -0700 Subject: O2 sensor I am currently running a EFI setup using a GM TBI unit and a 7747 computer. I purchased a chip from Howell for a 258 cube. inch engine for my 77 Toyota Land Cruiser. The engine is stock other than the EFI. The problem is the engine runs rich and uses quite a bit of fuel. I don't have the money to purchase a scanner to see what the computer is doing, so I disconnected the EGO sensor to mess around with it to see why the rich mixture. During idle, the reading on a DVM is almost zero. Any other time it is around 600 mv. From what I have read, this indicates a rich mixture but the computer doesn't set a code for a rich mixture. I drove around with the sensor disconnected and never got a code for a lean O2 sensor reading which seemed weird. Does anybody have any ideas? Also, this is the first time posting anything here, so any ideas about how to go about posting are welcome. ------------------------------ From: "David A. Cooley" Date: Wed, 10 Mar 1999 22:39:02 -0500 Subject: Re: 3800 supercharged, please read! At 07:25 PM 3/10/99 -0500, you wrote: > > > Hi all.. the question I pose is a tough one I believe. > > I own a 1988 buick Lesabre T-type with a 3800 series I in it. > I am changing the engine for a 1997 3800 series II supercharged. > What I would like to do is run the motor off of the stock computer. I figure > what I need to change is the prom, or the information on it anyways. > I think I already got the correct binary image of my prom from one of the > link sites.. but I would like to get an image of the 1997 grand prix GTP > codes.. so that I can program mine the same.. any other suggestions on > reprogramming the unit? or should it just run ok off the stock motor? > > Somone else I know has done this swap... with success.. but he hasn't touched > the computer yet.. he say's it's running fine however the check engine soon > light has been on since the swap. I'm sure things like the BLM #'s, and spark > advance are different.. please email me with any help you might have, thanks > again > > Kevin Kevin, The 1988 and 1997 PCM's are totally different animals... You can't take the binary from a 1997 PCM and run it in the 88 PCM. What you need is the table info for the computer you have so you can modify it (Try the chip from a 1988 Bonneville Supercharged if they made one or a park ave ultra). or put the PCM and harness from the 1997 donor. =========================================================== David Cooley N5XMT Internet: N5XMT@xxx.net Packet: N5XMT@xxx. Member #7068 I am Pentium of Borg...division is futile...you will be approximated. =========================================================== ------------------------------ From: David Askren Date: Wed, 10 Mar 1999 22:45:37 -0500 Subject: Re: AutoMeter (Aluminum or Platinum???) Goto westach.com, and look at the automotive gauges they have. I purchased the EGT with thermocouple probe for 68 bucks, and have been very satisfied. (Feelin' good, makin' my first contribution to the list) Dave d houlton x0710 wrote: > Anybody know what's up with AutoMeter and their seeming astronomical prices > on some of their gauges? > > I asked about their electric fuel pressure gauges a while ago. I had > wanted one for tuning my turbo install until I found out they were $180. > So, I passed and may end up getting one of the Intellitronix ones though. > > Kinda bites though as I really like the UltraLite series gauges and > would prefer to keep mine all the same. > > So now I'm also looking for an EGT gauge. I had seen somewhere that > they had these in the 2" UltraLite and Phantom series, but couldn't find > a listing for them. So I called AutoMeter and yes, they do make them and > I got the part numbers. Called Summit to check on price and availability. > > Yes they've got em. $101 for the EGT. Kinda high I think, but for an > EGT gauge, maybe not. So feeling moderately gouged, I'm figureing I might > as well get it because I really do want one. But, AutoMeter also said I > need a thermocouple. So I have Summit check that. I'm expecting another > $20 or so, but I'm willing to part with it. Guess what, it's $141.00!!! > WTF is up with that? $141 for a thermocouple? What's with AutoMeter? > > $180 for an electric fuel pressure gauge. Around $250 for an EGT gauge. > Do people actually pay these prices? Am I expecting too much for too > little? Most of their other gauges seem reasonable, but these are so > over priced I can't believe it. > > BTW, is a thermocouple a thermocouple a thermocouple? I mean are they > like O2 sensors at all. Can I go find a cheap one from Wick's (I think > I've seen them for under $20) or someplace else and expect it to work? > > thanks > --Dan ------------------------------ From: "Bruce Plecan" Date: Wed, 10 Mar 1999 23:19:41 -0500 Subject: Re: O2 sensor - -----Original Message----- From: cwagner@xxx.net> To: DIY_EFI@xxx.edu> Date: Wednesday, March 10, 1999 10:22 PM Subject: O2 sensor Trouble with aftermarket chips is ya never know what they did, if ya invest in a burner a couple chips and holders eraser, and read programming 101 stuff and the Home page about oem systems you could do lots with the 747. With the O2 disconnected should set at least a code 13 Bruce I am currently running a EFI setup using a GM TBI unit and a 7747 computer. I purchased a chip from Howell for a 258 cube. inch engine for my 77 Toyota Land Cruiser. The engine is stock other than the EFI. The problem is the engine runs rich and uses quite a bit of fuel. I don't have the money to purchase a scanner to see what the computer is doing, so I disconnected the EGO sensor to mess around with it to see why the rich mixture. During idle, the reading on a DVM is almost zero. Any other time it is around 600 mv. From what I have read, this indicates a rich mixture but the computer doesn't set a code for a rich mixture. I drove around with the sensor disconnected and never got a code for a lean O2 sensor reading which seemed weird. Does anybody have any ideas? Also, this is the first time posting anything here, so any ideas about how to go about posting are welcome. ------------------------------ From: Glen Beard Date: Wed, 10 Mar 1999 23:18:24 -0500 Subject: Re: AutoMeter FP gauge response time Roger Heflin wrote: > I think the issue with it is that the blowers and N2O kits gneerally > work by boosting (significantly) the fuel pressure, and that is how > they get more fuel into the engine, and the gage apparently does not > respond fast enough to this boosting of the fuel pressure. I think > stock the f-bodies run 45 psi, and I have heard of the kits boosting > the pressure up to 60psi or more, and this is all at the same rate as > the rpm is rising (for a blower). I run an Autometer Sport-Comp 2" mechanical FP gauge. I know that you are looking at electric FP gauges, but if you want a fast response, I recommend mechanical. Once you get past the fuel pressure isolator (bleeding it is a PITA) it works fine. BTW, I have seen my fuel pressure ramp up to 95-100psi at 5800rpm and 6psi boost. - -- Glen Beard -- 'why get bigger injectors' -- 95 T/A conv M6 Vortech !heads, !cam http://home.nycap.rr.com/gbeard1/TransAm.html ------------------------------ From: "Robert W. Hughes" Date: Wed, 10 Mar 1999 23:16:25 -0600 Subject: re: EGT gauges and thermocouples Check http://www.westach.com/ for EGT gauges and thermocouples. Not cheap but more reasonable than some others. - -- Robert W. Hughes (Bob) BackYard Engineering Houston, Texas rwhughe@xxx.org ------------------------------ From: "Michael D. Porter" Date: Wed, 10 Mar 1999 23:07:38 -0700 Subject: Suggestions on altitude compensation for mechanical FI system wanted... Okay, I know it's nuts... but I bought, mostly for nostalgia's sake, an older Lucas PI mechanical fuel injection system, made for the TR6 2.5 liter inline six. After lots of queries on the Triumphs list, and of people in England, it seems there was some very crude altitude compensation built into later units, but that it didn't work very well. The metering unit uses a baseline spring and cam calibration which is controlled by manifold vacuum. Higher the vacuum, the less fuel delivery at the injectors... It's mostly just controlling shuttle movement, I think. Anyone have any interesting ideas on including workable barometric compensation on such a system? Digitally, it's fairly easy, at least in closed loop mode. As I recall, the older L-Jetronic Toyotas had a sealed bellows with a strain gauge inside which altered the closed loop resistance. But, given the vacuum control system of the Lucas mechanical system, something like that would not be feasible, unless it operated a valve controlling a vacuum reservoir or some such which fed the metering unit. Cheers. ------------------------------ From: "allen pope" Date: Thu, 11 Mar 1999 01:18:16 -0500 Subject: Fuel managment system >I own a '82 280ZXT that I am in the process of adding more horsepower to, my >goal is about 300hp - 350hp at the flywheel. I am thinking about putting in >a programmable fuel management system, with larger injectors. I am wondering >have you had any experience with these types of systems, and if so would you >recommend any particular brand name. I would appriciate any information you >have on these systems because they are very expensive, and I only plan on >doing it one time. ------------------------------ End of DIY_EFI Digest V4 #157 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".