questions on pcm for new l67

**TCS Off** · 02-11-2012

Okay so I’m pretty new to the grand prix and 3800 world and the world of pcm tuning. I’ve got a 2000 gtp body but I’m putting a 99 supercharged 3800 in it this weekend. I’m putting headers, HAI, 180 thermostat, 104 autolightes, spark plugs wires, a 3.4 pulley, and a 3.29 built Trans. My question is can I use my old pcm, that was tuned for the 3.4 pulley and Trans before I got the car, and if I can use it how long will it last? Also should I just order one from overkill or is there someone in Grand Rapids anyone knows that’s good with this stuff or something else?

**blueguy** · 02-11-2012

You can use the old PCM, but with a trans that has a 3.29 ratio, you'll be banging off the rev limiter unless you change that in the trans settings.

**dsmuts** · 02-11-2012

If it worked with the motor and trans you are using then you'll be fine.

**TCS Off** · 02-11-2012

It was tuned for the transmission before but I were bouncing off the rev limiter all the time, is there any way to change the Trans setting without a complete tune. And it’s not tuned for the headers and HAI I don’t know if that makes a difference or not. Also the old motor blew up with the last computer and I think it had something to do with that or the crap tone of miles and no really flow mods.

**dsmuts** · 02-11-2012

How did it blow? Chipped piston? rod knock? You'd be better off taking the car and getting it tuned.

**blueguy** · 02-11-2012

Go buy a DHP PCM.

Tell 3800 Performance you want the GT trans settings in the PCM.

Done.

Also, if it was bouncing off the rev limiter, then it WASN'T correctly tuned.

**TCS Off** · 02-11-2012

Yeah I don’t think it was correctly tuned and no compression in piston third and messed up the heads and stuff. And I was wondering if it makes any difference that it came out of a Buick regal?