749 help
04-25-2005, 11:57 PM
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Car: 92 Formula 350
Engine: L98 with a T-76
Transmission: ArtCarr 700-R4
Axle/Gears: Bone stock 10bolt and 3.23's
749 help
I have the 749 and $58 setup in my car. The car is going into some sort of fuel cutoff mode around 7-8lbs of boost @ 4500rpm. And it also runs kind of lean between 2000-3500 rpm with a slight throttle input.(20-30% and not in boost) I mean the car is driveable but i just cant go WOT for very long before it enters that fuel cutoff mode. Any ideas what i can adjust to help these two problems. The SES light is not on either. I am using tunercat. Thanks
-Tim
-Tim
Last edited by TurboedTPI; 04-25-2005 at 11:59 PM.
04-26-2005, 12:29 AM
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Car: 1991 Z28
Engine: 305 TPI under 14 psi
Transmission: aftermarket T56
Axle/Gears: Moser 12 bolt 3.08 gears
Try using promgrammer instead of Tunercat to edit the rpm limit. TC for some reason screws up when switched to 8 cyl on the rev limit. That should fix your problem.
04-26-2005, 06:22 AM
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Car: An Ol Buick
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Re: 749 help
Originally posted by TurboedTPI
I have the 749 and $58 setup in my car. The car is going into some sort of fuel cutoff mode around 7-8lbs of boost @ 4500rpm. And it also runs kind of lean between 2000-3500 rpm with a slight throttle input.(20-30% and not in boost) I mean the car is driveable but i just cant go WOT for very long before it enters that fuel cutoff mode. Any ideas what i can adjust to help these two problems. The SES light is not on either. I am using tunercat. Thanks
-Tim
I have the 749 and $58 setup in my car. The car is going into some sort of fuel cutoff mode around 7-8lbs of boost @ 4500rpm. And it also runs kind of lean between 2000-3500 rpm with a slight throttle input.(20-30% and not in boost) I mean the car is driveable but i just cant go WOT for very long before it enters that fuel cutoff mode. Any ideas what i can adjust to help these two problems. The SES light is not on either. I am using tunercat. Thanks
-Tim
It can take some effort to balance the two out. I'm using only about 1/3 of the AE the original cal had, and then a richer PE AFR.
04-26-2005, 10:28 AM
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Car: 92 Formula 350
Engine: L98 with a T-76
Transmission: ArtCarr 700-R4
Axle/Gears: Bone stock 10bolt and 3.23's
Originally posted by YenkoZ28
Try using promgrammer instead of Tunercat to edit the rpm limit. TC for some reason screws up when switched to 8 cyl on the rev limit. That should fix your problem.
Try using promgrammer instead of Tunercat to edit the rpm limit. TC for some reason screws up when switched to 8 cyl on the rev limit. That should fix your problem.
04-26-2005, 10:38 AM
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Car: 1991 Z28
Engine: 305 TPI under 14 psi
Transmission: aftermarket T56
Axle/Gears: Moser 12 bolt 3.08 gears
http://www.sytyauthority.net/prom.html
page down and you should find the link to download it.
page down and you should find the link to download it.
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04-27-2005, 10:07 AM
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Car: 92 Formula 350
Engine: L98 with a T-76
Transmission: ArtCarr 700-R4
Axle/Gears: Bone stock 10bolt and 3.23's
I downloaded the promgrammer and when i used a bin that i modified with that program the engine light flickers dimly and it runs bad. I am not sure if i am doing something wrong or what.
04-27-2005, 10:43 AM
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Car: '87 Pontiac Trans AM
Engine: 350 CID STS Turbocharged
Transmission: T56 6-Speed SPEC Stage II
I don't think Promgrammer updates the checksum when you save. You have to go to tools -> checksum calculator and put it in manually. The car is running in limp home mode if the checksum fails, unless you change the mask to AA.
08-08-2007, 09:00 AM
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Car: 86 IROC-Z
Engine: Superramed 355 w/ intercooled T72
Transmission: T56 -=- www.iroc-ss.com
Re: 749 help
Uggggh, Ive been chasing this problem. Man I love thirdgen.org search! I think this fuel cutoff should be mentioned in the 749 conversions. I dont know why the default setting is so low??? My car is just dropping dead at 4500-5000 rpm. I even swapped out a new MSD 6AL I put in while installing this new engine/ECU combo thinking it might be the problem(luckily I had an old 6A to test with.)
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