Boost Pressure

[TurboTPI]

How much boost does a stock Sy/Ty run. I have a Sy/Ty ecm in my car and it goes into a fuel cuttoff mode and i cant figure out why. This occurs at like 7-8 lbs of boost @ 4500 rpm. I cant beleive that they run only 7 lbs of boost. Any ideas what would cause this. Is this the rev limit?

 

[syclonekid43]

Re: Boost Pressure

14.7 lbs of boost. anything over that for more than 5 seconds. it kills the injectors

 

[93ty475]

Re: Boost Pressure

What injectors are you running? Any ecm mods? There are a few threads stashed away in here regarding V8 749 apps...

 

[skwayb]

Re: Boost Pressure

I would suggest going to the DIY Prom section on www.thirdgen.org Lots of info in there on how to run the 749 on a V8.

 

[TurboTPI]

Re: Boost Pressure

I am running 32lb injectors. Yeah, im on thirdgen.org, but i just cant seem to figure it out so i figured someone on here might know the problem. How can i find old threads about v8s running the 749 ecm?

 

[dgoodhue]

Re: Boost Pressure

4500 RPM sounds like the stock RPM fuel cutoff. On the stock chip its 4800 cutoff and drop to 4600 before goes on. (its adjustable) Boost cut off with a 2 bar map is basic 15+ psi pegged for more than 2 sec, that can be removed.