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

 

Check out "Fuel cut off" at 38A and 38C

/N.

 

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.

 

Or Ask Tunercat for $58B def file, its adjusted for 8 cyl select.

/N.

 

The stock cal is kinda odd, in that it uses a ton of AE, and when that runs out, the PE is often too lean.

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.

 

Where can i get this program?

 

http://www.sytyauthority.net/prom.html
page down and you should find the link to download it.

 

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.

 

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.

 

That makes sense now, thanks.

 

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.)