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36 Minutes Ago

dfarr67 replied to a thread Vortec/Edelbrock TPI in Buy - Sell - Trade - Wanted

Sold

3 replies | 2836 view(s)

8 Hours Ago

rauldelp replied to a thread Using a $61 bin on a $62 ecm, damage? in GM EFI Systems

Was afraid of that, oh well, no biggie. I'll probably just upgrade to the 7427 PCM, which will get me all the options I could possibly want it...

2 replies | 67 view(s)

11 Hours Ago

kevinvinv started a thread Throttle Kicker and TCC in $0D and a 16197427 in GM EFI Systems

So I've been struggling for a LONG time with this one: Situation: 94 Blazer, SBC removed, BBC installed 16197427 PCM 4L60 Trans from Finish...

0 replies | 19 view(s)

13 Hours Ago

threefiddy started a thread Small block conversion in Introductions

Hi Folks new to the forum - I'm running a worked small block , turbo 700 and 9 inch in a 66 Holden which is a GM body from down under. The plan is to...

0 replies | 22 view(s)

14 Hours Ago

Firefighter Z started a thread 94' Z28 4L60E 3600 stall tuning help. in GM EFI Systems

So Last year I ran at the track with my 94 Z28 A4, cc503 cam, 3600 stall, 3:23 gears on a MT DR's with other supporting mods. My time was a 13.0with...

0 replies | 20 view(s)

16 Hours Ago

Jim_Rockford replied to a thread Need a chip burned 1992 B4C camaro in EFI Tune

OK fixing to start tuning, I noticed the chip is AXYC that come up as a 90 f car 305 5 speed, Mine is a 92 ..... soory I had it listed as TC it was...

16 replies | 2162 view(s)

19 Hours Ago

dave w replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

Each ECM might work slightly differently. Sometimes it might be necessary to use a "belt & suspenders" approach to disabling a routine like "closed...

21 replies | 428 view(s)

21 Hours Ago

SkinnyG replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

OK, With BLM restrained to 128, and Closed Loop turned off, I went and did some driving for about 40 minutes. Strangely, the ECU still went into...

21 replies | 428 view(s)

1 Day Ago

myburb replied to a thread 1227747 question in GM EFI Systems

I think $31 was for HD that had 4l80e trans. Are you using vss? Although there are work arounds od, oe and 31 won't be real happy without vss.

9 replies | 206 view(s)

1 Day Ago

Jadgsxr replied to a thread 1227747 question in GM EFI Systems

Yes and I was mistaken earlier, it's Fast355's $od that's working better for me. I'm still goofing around with it though. Still not up to par. I'm...

9 replies | 206 view(s)

1 Day Ago

myburb replied to a thread 1227747 question in GM EFI Systems

Did you try $OD with fast 355 700r xdf.

9 replies | 206 view(s)

1 Day Ago

SkinnyG replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

Mind you, it did throw a High-MAP, Rich-O2, and EST codes. I'll check those out first. Maybe make sure the chip was fully seated....

21 replies | 428 view(s)

1 Day Ago

1project2many replied to a thread Hi all! Working on 94 Z-28, A4. in Introductions

The more popular OBD1 stuff was hacked back then and software was available to reprogram EPROM's. The L98, many of the TBI applications, and the...

7 replies | 134 view(s)

1 Day Ago

SkinnyG replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

Humble pie. I max'd the Open Loop temperature, and set min and max BLM to 128, and went for a drive. OMG. Rich. Ok. So I will do a bunch of...

21 replies | 428 view(s)

1 Day Ago

SweetZRag replied to a thread Hi all! Working on 94 Z-28, A4. in Introductions

kur4o - Thanks so much for this info. This is exactly what I am looking for. I need theory so can really understand the topic. I have no intention...

7 replies | 134 view(s)

1 Day Ago

Jadgsxr replied to a thread 1227747 question in GM EFI Systems

Repinning to the '7427 wasn't that bad. It started running rough and I never did get it smooth last night. I have a '90 G20 Vin K, 700R4, 3.08s w/...

9 replies | 206 view(s)

1 Day Ago

kur4o replied to a thread new $EE tuning thing! in GM EFI Systems

I was thinking to fix some of the notes and forget to upload source. Ignore any wierd looking info. The closed loop control is as follow. 02...

1024 replies | 188407 view(s)

1 Day Ago

spfautsch replied to a thread new $EE tuning thing! in GM EFI Systems

I might have time to test this weekend. Any chance you could post the source so I can build it for linux?

1024 replies | 188407 view(s)

2 Days Ago

dave w replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

Screen shot below showing $OD closed loop tuning AFR averages with WBO2 data logs. BLM averages below 128 indicate rich / BLM averages above 128...

21 replies | 428 view(s)

2 Days Ago

kur4o replied to a thread Hi all! Working on 94 Z-28, A4. in Introductions

http://calibra-classic.org/pages/ecu2pc1.htm#PurposeAndScope http://calibra-classic.org/pages/ecu2pc.htm Another interesting article.

7 replies | 134 view(s)

2 Days Ago

SkinnyG replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

Just looking at temperature multipliers. These don't really make sense to me. On one hand, the coolant multiplier at 108°C should be giving...

21 replies | 428 view(s)

2 Days Ago

steveo replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

nope, closed loop is only capable of targeting what it percieves to be stoich, thats just how a narrow band trim system works. altering o2 voltage...

21 replies | 428 view(s)

2 Days Ago

SkinnyG replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

I guess I should clarify: this wasn't a "known good" setup to start with. The factory tune "worked" (more or less) with the unmolested LO3 305 V8,...

21 replies | 428 view(s)

2 Days Ago

SweetZRag replied to a thread Hi all! Working on 94 Z-28, A4. in Introductions

I have been a member of cz28 forum for years but only recently found this site. Nice to see so many people finally get into tuning. When I bought...

7 replies | 134 view(s)

2 Days Ago

SkinnyG replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

Ah, yes, that is unclear. My bad. I can fatten the VE table until I get 14.7, but the BLMs see "rich" and pull fuel. If I set the VE to what the...

21 replies | 428 view(s)

2 Days Ago

myburb replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

I am not trying to be a smart ass but I don’t understand. Above there was a line in the post. Even at idle and cruise the WB is around 14.7, but...

21 replies | 428 view(s)

2 Days Ago

SkinnyG replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

Am I understanding you correctly in that I tune so the computer/BLM is happy with whatever the end result it? Could I just change the listed...

21 replies | 428 view(s)

2 Days Ago

dktool replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

I misspoke here, I meant " use the WB as a reference" being just to monitor what the CL fueling is doing and under all conditions (except P.E.) it...

21 replies | 428 view(s)

2 Days Ago

steveo replied to a thread BLMs say rich, but WBO2 and NBO2 and surging all say lean - what gives? in GM EFI Systems

there's also the argument that if you're going to run closed loop, you are never going to achieve the wideband AFR, all you'd be doing is making the...

21 replies | 428 view(s)

2 Days Ago

steveo replied to a thread Using a $61 bin on a $62 ecm, damage? in GM EFI Systems

i doubt it'll work, they're written for fairly different ECMs. will it fry it if you try? as long as the chips are the same type and size, i have...

2 replies | 67 view(s)