DIY_EFI Digest Thursday, March 30 2000 Volume 05 : Number 130 In this issue: RE: As The World Turns . . . (was Cheap Protection ... The circu it) Re: Custom PCM & Injectors Questions Re: Looking for pulse output MAF Re: Diacom cable Re: Looking for pulse output MAF Re: Looking for pulse output MAF Re: Looking for pulse output MAF Re: Custom PCM & Injectors Questions See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Wed, 29 Mar 2000 20:06:34 -0500 From: Frederic Breitwieser Subject: RE: As The World Turns . . . (was Cheap Protection ... The circu it) >should Microsoft's new logo be that spinning 'world' >thing in IE (As The World Turns . . . ), or should >it be the hour-glass mouse-cursor? The new logo should be a rotating penguin with a sign "Microsoft Sucks !" >Back to the subject . . . so I gave up (on MS IE!); the new hyperlink Try Nutscrape. At least the logo is less blinding. - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Mon, 27 Mar 2000 08:32:21 -0500 From: "nacelp" Subject: Re: Custom PCM & Injectors Questions > I have a custom programmed PCM which, among other things, > is calibrated to run 30# injectors. Which PCM?. > I am currently running the custom PCM with the stock 19#. > Checking readouts during street and track driving conditions > from an OTC scanner seem to indicate that everything is aok > in both closed and open loops although on the rich side. Customized by who?. For doing what? > Generally, are there any effects on the life expectancy of > running the stock injectors with this PCM? I've tried > 24# injectors but experience serious bogging under WOT. Stock injectors with stock PCM normally go 150K miles > Also, the computer has been programmed to remove all delays. > I do not have any idea what delays are being referred to. > What are possible delays that can be removed? Various enrichments come to mind, like for WOT. > Thanks very much for any insights that you may have. Gave ya more guestions then answers, need more data to figure out what ya got. Easy for you to know what what you have, but to read this not knowing you just doesn't give enough info.. Grumpy > > Bob (retired) > -------------------------------------------------------------------------- - -- > To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) > in the body of a message (not the subject) to majordomo@xxx.org > - ----- End of forwarded message from owner-diy_efi@xxx.org ----- - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 29 Mar 2000 21:38:05 -0500 From: Scot Sealander Subject: Re: Looking for pulse output MAF Brian Franchuk wrote: > I'm looking for a GM MAF (pulse output) that can handle the flow > from a 4.0 liter motor (approx 220hp). Do you know what flow rate you actually have? 220 HP is about 170 grams/sec. If you are not going to go over this, the Buick 3800 MAF is a high freq MAF that will max out about 170 g/s. I put one of these in the intake path of my speed density turbo Grand Prix, but the 3.1L can max it out with enough boost. The 3800 MAF output is around 1 kHz to 10 kHz. If you are using the older 2.8L MAF, that is a low freq MAF..... Might need some changes in your converter. Scot Sealander - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 29 Mar 2000 22:43:34 -0600 From: MysticZ Subject: Re: Diacom cable Dave Plummer wrote: > > What good is a compatible cable? Is there software that you can use with > it? That's where we were getting with all of this. I already have the software, but don't want to coil up a long cable when the computer is in the glove compartment anyway. But I was talking to a friend tonite and he remembers someone working on some OBDII scanning software a while back. I'll see if I can find anything on it. - -- Steve 97 Chevy Camaro Z28, Mystic teal, A4, not stock 90 Kawasaki EX500A4, black, M6, not even CLOSE to stock! lt1_z28@xxx.net/~lt1_z28 Aluminum, steel, carbon fiber, titanium, and two cast iron balls. McMillan Motorsports- http://www.mmsbikes.com - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Wed, 29 Mar 2000 20:41:33 -0800 From: "TK" Subject: Re: Looking for pulse output MAF Do you mean the Hitachi "in TB" maf or the external maf? So I if get a reading of 252 g/s on Diacom on my 3800 SC, it's not really that much? TK - ----- Original Message ----- From: Scot Sealander To: Sent: Wednesday, March 29, 2000 6:38 PM Subject: Re: Looking for pulse output MAF > Brian Franchuk wrote: > > > I'm looking for a GM MAF (pulse output) that can handle the flow > > from a 4.0 liter motor (approx 220hp). > > Do you know what flow rate you actually have? 220 HP is about > 170 grams/sec. If you are not going to go over this, the > Buick 3800 MAF is a high freq MAF that will max out about > 170 g/s. I put one of these in the intake path of my speed > density turbo Grand Prix, but the 3.1L can max it out > with enough boost. > > The 3800 MAF output is around 1 kHz to 10 kHz. If you are > using the older 2.8L MAF, that is a low freq MAF..... Might > need some changes in your converter. > > Scot Sealander > > -------------------------------------------------------------------------- - -- > To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) > in the body of a message (not the subject) to majordomo@xxx.org > > - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Thu, 30 Mar 2000 05:32:58 -0500 From: Scot Sealander Subject: Re: Looking for pulse output MAF TK wrote: > Do you mean the Hitachi "in TB" maf or the external maf? The Hitachi MAF. > So I if get a reading of 252 g/s on Diacom on my 3800 SC, it's not really that > much? What freq is it getting? The NA 3800 uses the 170 g/s MAF. The supercharged 3800 probably uses a higher capacity MAF. At any rate, the tables stop at 170 g/s in the NA application. Scot Sealander - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Thu, 30 Mar 2000 07:17:35 -0500 From: "nacelp" Subject: Re: Looking for pulse output MAF On this thread I posted some grms/sec for HP, and just noticed I errored, it should be .75gm/sec per HP I used 1.3 grams/sec, my confusion was it's 1.3 CFM=1HP, more or less Grumpy - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Thu, 30 Mar 2000 07:19:06 From: Bob Tom Subject: Re: Custom PCM & Injectors Questions Hi, Grumpy. At 08:32 AM 3/27/00 -0500, you wrote: >Which PCM?. The PCM is a '96 Mopar Performance hi-po computer. My vehicle is a '97 Dakota 318 with 19# stock injectors, MP camshaft, and better breathing and exhaust modifications. >Customized by who?. For doing what? This computer was custom programmed by a company in AZ by the name of Z-Industries (I believe) for an owner of a Ram SS/T 360 with a Paxton SuperCharger and N2O. The goal was to increase performance for the 1/4-mi. track. The first computer sent to him with the custom program was erroneously put on a Dakota computer. At the time, he was told it was for a '97 and, hence, my interest and one of the main reasons for buying it. (MP has never put out a hi-po PCM for the '97s). The '96 and '97 Dakotas are both OBD-II compliant but went through a major exterior design as well as major differences in how sensor outputs reach the dash gauges. I do not have the technical specs of the custom program but I was told that it was calibrated to run with 30# injectors, calibrated for 160F coolant thermostat (stock is 195F with most performance Daks running 180F tstat), all delays were removed to give instantaneous throttle response, rpm and speed limiters were raised, tranny shift rpm points were raised, idle rpm raised, prevent detonation for 10lb supercharger boost and 150hp N2O shot, etc. While my surface knowledge of efi is enough to tell me that running this PCM on my vehicle is a gamble, I took the chance and am taking the time to put it through careful road tests with a scanner. At idle, scanner outputs show that timing has been advanced more than the MP hi-po PCM and pulse width of 19# injectors is shorter than with the MP PCM (I'm looking to see if the scanner can output duty cycle data). In closed loop, the o2 sensor is doing its job bouncing readout of rich and lean with longer stays at rich. At WOT (open loop) and initial startup, it shows rich. As previously stated, under sudden WOT at any rpm, there is a sustained 'bogging' with the 24# injectors, and hence the return to the 19s. Gradual changes in throttle position does not cause this problem. >> Generally, are there any effects on the life expectancy of >> running the stock injectors with this PCM? >> Also, the computer has been programmed to remove all delays. >> What are possible delays that can be removed? My questions were more of a general nature since I do not have any tech specs of the custom program. It seemed to me that, if a program is calibrated for 30# injectors, pulse width would be different than a program calibrated for 19# (or 24#) injectors as well as duty cycles (???) I have complete zero knowledge on delays. I've tried accessing the archives to see if there is anything in these subject areas (does not have to be specific vehicle related) but have been unable to access them lately. If there are any sites in which I can get a little deeper knowledge into engine/fuel management, I would appreciate any references. Thanks for taking the time to reply. Bob - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ End of DIY_EFI Digest V5 #130 ***************************** 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".