DIY_EFI Digest Monday, 25 November 1996 Volume 01 : Number 360 In this issue: SFI to MPFI Conversion Re: Subaru Fault Codes [none] Re: Oliver's ALDL decoder Re: Diff between theory and practice Re: Oliver's ALDC converter See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: Roger Feingold Date: Sun, 24 Nov 1996 18:34:47 +0000 Subject: SFI to MPFI Conversion Hi group, I'm a microprocessor engineer who works on cars, very happy to find this list. I searched the archives but couldn't find any info on my project. I'm putting a 3.4l engine in my Fiero in place of the 2.8l one. I have the fuel injectors, with GM part number, 17103007, but don't know the flow rate, any way to find out? The 3.4 used SFI and the Fiero is MPFI, would the 3.4l injectors work in the Fiero?, (one pulse every two rotations verses one pulse every rotation). I'm wondering about differences in pulse width. Thanks. ------------------------------ From: Doug Robson Date: Mon, 25 Nov 1996 08:57:45 +1100 Subject: Re: Subaru Fault Codes John Firkins wrote: > > Hi all > > Does anyone have any idea on where to find out about the fault codes from a > Subaru B2 cpu? > It was originally fitted to a quad cam EJ20 motor & was working well in my > Kombi until this morning. Now the ignition is momemtarily cut at revs above > 4k & the led on the cpu is flashing > 3 long,3 short,1long,2 short. > > TIA > > John Firkins I have a friend who works for subaru he says whilst they dont use the B2 computer in Oz the fault codes are the same for all subarus we use comptuers designated 63 d5 g1 u1 1 long, 2 short = 12 is starter switch, usually caused in autos by turning the ignition switch on/off real quick and the autoi computer doesnt get up quick enough so the main ecu blames the starter switch. This is 99% of the time crap so ignore 3 long 3 short = 33 is speed sensor from gearbox for speedo. you need the foolowing sensors to make it go .Crank angle, Cam angle, Tps or air flow if you disconnect tps or air flow the computer will let the other take over so you can eliminate tps or a/f meter as cause by unplugging. He says if you have ignition coils on the plugs then look at the boot between the plug and coil.The coils are usually ok but ANY!!!!!! split or weather in the boot will be a problem. New Zealand have problems with their coils. I also suggest you put on a proper scope and let it run at say 3000 for a minutes and get the mechanic to look at the graph even if it sounds ok the graph will get abit spikey hope it helps regards |===============================================================| | When I die, | | I want to go in my sleep, like my grandfather, | | not screaming like the passengers in his car. | |---------------------------------------------------------------| | Doug Robson (H) mailto:doug@xxx.au | | (W) mailto:Doug.Robson@xxx.com | | Sydney, Australia http://www.cia.com.au/doug | |---------------------------------------------------------------| | Club Car Racing Register of NSW | Thank God | | 1992/93 Under 2 litre State Champion | for | | http://www.clubcars.org.au | Gravity | |===============================================================| ------------------------------ From: NICK_VAUGHAN@xxx.com Date: Mon, 25 Nov 96 00:55:28 +0000 Subject: [none] Item Subject: cc:Mail Text ....................................................................... Item Subject: efi.txt 25/11/96 0:48 Author: NICK VAUGHAN at HP-UnitedKingdom,om10 Date: 24/11/96 23:43 Priority: Normal TO: DIY_EFI (Majordomo@xxx.edu) Subject: - ------------------------------- Message Contents ------------------------------- Does anyone have any experience of EFI for small capacity (850cc) two stroke outboard motors. The engine I am conserned with is an 850cc three cylinder two stroke, developing about 125HP @ 9500 rpm, presently fed by three twin choke webber carbs. It in used on a F3 race boat. ------------------------------ From: Todd King Date: Tue, 24 Sep 96 18:04:00 PDT Subject: Re: Oliver's ALDL decoder <<< From: "Curt Martin" Date: Sat, 23 Nov 1996 11:17:26 -0500 Subject: Hello...short introduction... ... I've just started working with a ALDC to RS-232 converter made by Oliver Scholz (from the Fiero e-mail list) to start figuring out the serial output of the GM computer. >>> Isn't Oliver the guy who worked with the Turbolink Buick scantool guy (Ken Mosher) back in the early stages of reverse engineering and development? Todd Todd_King@xxx.com ------------------------------ From: jon hanson Date: Mon, 25 Nov 1996 09:01:20 +0200 Subject: Re: Diff between theory and practice At 11:42 23/11/96 +1000, you wrote: >The difference on this motor could be due to the motor involved. With >these 4AG toyota motors the inlet tract length is changed by the TVIS >system. Removing these butterflies will change the torque point. Toyoto >use this system to spread the tourque curve. It is a common racing >change in australia to remove the butterflies which then gives you more >torque at higher revs than before. With this modified motor the torque >peak could well be occuring at 6000 rpm as the injector duty cycle >implies. > >Regards > >David Chambers > > David, I've got some doubts on this one. On a TVIS 4age each of the 8 intake valves draws its air thru a separate tuned length intake runner. one of the 2 runners to each cylinder is throttled with a a butterfly which opens at 4350 rpm (on the 112 hp usa spec motor anyway).This maintains a high gas velocity and turbulence which peps up the torque curve at lower revs. When open all 8 runners provide the airflow needed at higher rpm's. The length of the inlet tract which would move the peak torque point is not changed and the butterflies are fully open at > 4350 rpm so I dont think it would move peak torque up from 4800 rpm. Any thoughts on this one, anyone Regards Jon Hanson Johannesburg South Africa ------------------------------ From: Doug Rorem Date: Mon, 25 Nov 1996 01:41:52 -0600 Subject: Re: Oliver's ALDC converter ... .. ... >>Oliver is into Fiero's, so naturaly, the only two motor/ecm combos that it >>decodes completely are the VIN "9" 2.8L V6 and the VIN "R" 2.5L L4 >> >>I've hooked it up to my VIN "S" '87 Camaro and it does decode most of the >>values (rpm, IAC, coolant temp, TCC, integrator, TPS, O2 rich/lean, Loop, >>etc.) Some of the values that don't decode or I question are the MAT, MAF >>(not suprised, the Fiero is a MAP system), and AC settings. The car is 10 >>years old and has a flaky idle to start with, so I may have a few bad >>sensors... I still have to go through the system sensor by sensor. I'm not >>getting an SES light or error codes, so nothing has failed completely. >> >>Oliver's web page is... >>http://www.franken.de/users/degobah/luke/scantool.html >> >>hope this helps, >> >> >> >> The URL is: http://www.franken.de/users/dagobah/luke/scantool.html - -- Doug Rorem University of Illinois at Chicago (312)-996-5439 [voice] EECS Department RM 1120 (312)-413-1065 [fax] 851 S. Morgan Street (708)-996-2226 [pager] Chicago, IL 60607-7053 rorem@xxx.edu ------------------------------ End of DIY_EFI Digest V1 #360 ***************************** 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".