my friend and are trying to tune his 383 stroker with the new FAST ECU installed and the software. Around 5500 rpm it is missing or sounds like it's missing, wires are fine plugs are new and checked all of that last night. We have gone higher in the VE in this part of the graph or KPA/RPM range and also tried leaning it, neither work it does the same thing. We think we have the manifold pressure and fuel ratio set pretty close. It does smooth out at about 6000 rpm a little bit. We can throw his stock PCM back in and it runs just fine. Whole reason he bought the FAST was to allow shifting over the stock 6300rpm (believe that's the stock rpm). It's pretty smooth throught all the ranges and idles fine it's just the 5500 rpm causing us problems. I tried this in the Computer Programming but obviously nobody seems to know. Maybe someone familiar with the various tables and pretty good at this could help. Were very close with it just need some fine tuning.

 

Go here....
http://turbobuick.com/messagebd/
There are plenty of people who can, and will help you there.

 

ok thanks for the tip

 

Umm...is this in an LT1? I'm pretty sure you can go past 6300rpm?

 

Because RPM is an 8-bit field, it is not possible for the PCM to indicate more than 6,375rpm, but it will function right on up to 7,000rpm.

I think "Drag Bear" claimed to be running well over 7K on the stocker.

 

i thought the stock PCM couldn't handle more than 6999 rpms

 

Trey: Some people have pushed their pcm past that point, and for some reason 7200 sticks out in my brain. However, when Jason Short used the pcm in my car (I bought it from him) he said he could not even touch 7k or else the car would shut down (turn off).

Ryan

 

back on topic anyone familiar with the tuning tables that can help. The turbobuick site was pretty good but turbo VE tables run quite a bit different.

 

is the computer just not fast enough? cant "thinik" fast enogh and just kills spark (no pcm, no opti), fuel (EFI) and a slew of othe things

 

Brettinator, do you have the Wideband O2 Option? If so, do some data logs, see what the O2 is doing, as far as correcting, and go from there. If you get some data logs, I can take a look at em if your running the Windows version of the software.

 

God I hope it's fast enough, it cost him enough...no it's plenty fast enough it's just getting it set right is the trick

 

nope doesn't have wideband, we can tune it live and watch everything but does not have wideband is what he told me.

 

theres no tables for it to read from above 7k.

 

Brettinator, if you don't have the Wideband, I would suggest either getting an EGT meter on the car, or get it to a dyno soon that has a Wideband, you could be doing damage if it's lean.