DIY_EFI Digest Wednesday, July 28 1999 Volume 04 : Number 436 In this issue: Re: Trip computer? Re: DIY_EFI Digest V4 #435 Re: DIY_EFI Digest V4 #435 Some efi: carby/super charger setup Re: DIY_EFI Digest V4 #435 Tpi on a Suburban See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Tue, 27 Jul 1999 15:59:39 -0400 (EDT) From: Pat Ford Subject: Re: Trip computer? a few months ago circuit cellar ink ( a magazine) had just that kind of beasty try http://www.oztechnics.com.au/frame_car.htm this beast keeps track of your injector on time hope it helps Previously, you (DIY_EFI Digest) wrote: > > DIY_EFI Digest Tuesday, July 27 1999 Volume 04 : Number 435 > > > > In this issue: > > Trip computer? > TPI into a 86 4x4 Suburban. > > See the end of the digest for information on subscribing to the > DIY_EFI or DIY_EFI-Digest mailing lists. > > ---------------------------------------------------------------------- > > Date: Tue, 27 Jul 1999 10:39:10 -0400 > From: Barry Tisdale > Subject: Trip computer? > > I owned a Dodge Omni, early '80s carb version, which had an aftermarket trip computer installed. It'd give you MPG, time to empty, miles & time to destination, etc. Info needed by it was wheel rpm, time & fuel flow. Flowmeter on fuel line to carb gave it that info. > > Question: are there any units available for FI engines, where a fuel flowmeter wouldn't be of much use? Could you get *any* sort of accuracy calculating from rpm, bpw & throttle opening? Maybe 2 flowmeters, one on supply rail, one on return line, subtract out from in? > > Any thoughts from anyone? > > Thanks - Barry > > ------------------------------ > > End of DIY_EFI Digest V4 #435 > ***************************** > > 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". > - -- Pat Ford email: pford@xxx.com QNX Software Systems, Ltd. WWW: http://www.qnx.com (613) 591-0931 (voice) mail: 175 Terrence Matthews (613) 591-3579 (fax) Kanata, Ontario, Canada K2M 1W8 ------------------------------ Date: Tue, 27 Jul 1999 17:53:31 -0400 From: "Clare Snyder" Subject: Re: DIY_EFI Digest V4 #435 > > Date: Tue, 27 Jul 1999 10:39:10 -0400 > From: Barry Tisdale > Subject: Trip computer? > > I owned a Dodge Omni, early '80s carb version, which had an aftermarket trip computer installed. It'd give you MPG, time to empty, miles & time to destination, etc. Info needed by it was wheel rpm, time & fuel flow. Flowmeter on fuel line to carb gave it that info. > > Question: are there any units available for FI engines, where a fuel flowmeter wouldn't be of much use? Could you get *any* sort of accuracy calculating from rpm, bpw & throttle opening? Maybe 2 flowmeters, one on supply rail, one on return line, subtract out from in? > > Any thoughts from anyone? > > Thanks - Barry The "compucruise" unit (sounds like what you have) was available with a little black box for EFI use that totalled the injector open time to calculate fuel flow. Worked real good. > > ------------------------------ > > Date: Tue, 27 Jul 1999 07:59:49 PDT > From: "David Sagers" > Subject: TPI into a 86 4x4 Suburban. > > I'm in the process of doing a similar conversion, except mine is a '92. > > There is a lot of work to do, but many resources for the parts & > information. > > How far along are you? Have you decided to go with a MAF or a MAP system or > will you use what you can find? > > You might start with http://www.fuelinjection.com/ These guys specialize > in complete conversions or just parts depending on what you want. The > complete kit from Fuel Injection Specialties is a whopping $2400!! You can > save yourself some major dollars by > just shopping around, in fact by watching the ads on: > > http://128.196.140.199/classifieds/search2.cfm?type=sale&which=part > > you can usually find complete TPI systems. Before you buy many parts do > some research and decide what you want or you could end up like me and have > lots of extra parts around that you won't be using. For instance, with a > 350 you probably don't want to buy the huge 58mm or 1000 cfm throttle body, > stay with the smaller version and driveability will be a lot better. Also > consider that many of the "speed parts or the week" are made for high > revving IROCs and Z28s, a 4x4 is a different story. > > Read all the info at the Fuel Injection Specialties web site. They can even > help you figure out which cable you'll need for the tranny, throttle and > cruise control. I've called them a couple of times and they are good to > talk to on the phone. > > Here are a few items I learned along the way. The center head to manifold > bolt angle changed in about '87. If you use older heads with a TPI intake, > the bolt holes in the intake will need to be elongated, since you engine is > already built just plan on this modification. > > The injectors give a better spray pattern if run at fuel pressures somewhat > above the factory settings, try 50 to 55 vs. the factory setting of 45. > For a 350 start out with the 22 lbs injectors and bump the fuel pressure. > > On my '92 I have to change the mounting brackets for the A/C for the TPI, > Fuel Injection Specialties can tell you what you need for your application. > > Filter your fuel with a good high pressure filter made for the higher > pressures in an TPI. DO NOT use a filter made for a carbureted system or a > TBI system!! They can burst and create a deadly fire. > > Don't fight with the factory wiring harness, buy one from Painless Wiring, > see their web page at: http://www.painlesswiring.com/ This harness > connects everything from the VSS, to the tranny lockup, to the fuel pump > relays, etc... Again, read everything on the web site, but when it comes > time to buy the harness, buy it from Summit, you'll save a couple of hundred > dollars. Painless even recommends that you buy from one of their dealers > instead of buying from them. Once you own the Painless harness they have > very good tech support. > But before you buy make sure you know which type of system you are going to > use. > > I don't mind continuing this conversation on line, in fact maybe it'll > revive this board. However, if you want to you can contact me off line. > > > _______________________________________________________________ > Get Free Email and Do More On The Web. Visit http://www.msn.com > > ------------------------------ > > End of DIY_EFI Digest V4 #435 > ***************************** > > 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". > ------------------------------ Date: Tue, 27 Jul 1999 19:16:09 EDT From: A70Duster@xxx.com Subject: Re: DIY_EFI Digest V4 #435 << Could you get *any* sort of accuracy calculating from rpm, bpw & throttle opening? Maybe 2 flowmeters, one on supply rail, one on return line, subtract out from in? >> If the FI pump is external, you could run the flow meter between the tank pickup and pump and route the return to in input of the pump. Any return fuel would be sucked up by the pump. My 2¢ Mike ------------------------------ Date: Wed, 28 Jul 1999 09:33:29 +0800 From: dzorde@xxx.com Subject: Some efi: carby/super charger setup Hi all, With the list in digest mode it seems the mail has really slowed down. Anyway, I'd appreciate if someone has a solution for this minor inconvenience. I have finally managed to get my Fiat 850, with the MR2 supercharger on it, running. Currently its using the original carby in a blow through configuration (the setup is crap, but will have to do for the time being). With the whole carby being pressurised there is enough fuel pressure in the electric pump to make the car idle, however I'm sure as the pressure builds up the fuel pump runs out of steam. What is the solution? Do you use a high pressure efi pump with a 0.5bar regulator, vacuum/boost compensated to the inlet manifold, so the fuel pressure is always 0.5bar above boost level ? What about the float. The carby currently uses a soldered brass float, will it be strong enough to withstand say 20psi of boost ? Or will I need to fill it with something non collapsable ? What about the needle and seat, will there be any problems here ? Might sound logical, but I'm a bit out of my depths here and so appreciate any answers, on list or off list. Dan dzorde@xxx.com ------------------------------ Date: Tue, 27 Jul 1999 23:24:32 -0400 From: "Gary Derian" Subject: Re: DIY_EFI Digest V4 #435 Connect to an injector and add up the "on time" to get fuel flow. Gary Derian > > I owned a Dodge Omni, early '80s carb version, which had an aftermarket trip computer installed. It'd give you MPG, time to empty, miles & time to destination, etc. Info needed by it was wheel rpm, time & fuel flow. Flowmeter on fuel line to carb gave it that info. > > Question: are there any units available for FI engines, where a fuel flowmeter wouldn't be of much use? Could you get *any* sort of accuracy calculating from rpm, bpw & throttle opening? Maybe 2 flowmeters, one on supply rail, one on return line, subtract out from in? > > Any thoughts from anyone? > > Thanks - Barry ------------------------------ Date: Tue, 27 Jul 1999 23:35:45 -0700 From: "Mike" Subject: Tpi on a Suburban Just to join in im doing a tpi swap too. Ive got a 88 350 tpi going into a 72 chevy P/u. My application is a little different since i wont be 4weeling a lowered truck :). I'm going with 350 flattop world sportsman heads tpis bigmouth intake slp simeese runners lt4 hot cam 1.6 roller rockers 24# injectors (ford svo injectors only $200 instead of $400 for chevy) I still need a external fuel pump and a 52mm tb(maybe 58mm). I have a complete harness from the 88 camaro, looks real simple to install so ithink im going to go with it. Im also going with a s10 converter and a 91 700r4 tranny. Mike ------------------------------ End of DIY_EFI Digest V4 #436 ***************************** 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".