Cadillac Powertrain Control Module (PCM) Tuning Discussion, What tuners do we have here? in Cadillac Engine Discussion; I personally do a lot of personal tuning for the LT1/4L60E. I have capabilities to do most any GM car ...
TwEECer is for Fords right? I haven't heard of them just what little I have seen on the net.
As for HP on the LT1, I would say 10-15 hp is reasonable. But the improvements in transmission shifting and driveabiliy are soooo well worth it.
You can turn off EGR, or change when or how it turns on, you can turn on/off the AIR pump (legal on 95-96 models per EPA), you can change timing anywhere, you can remove the MAF, you can tweak the timing retard for traction control, you can change shift times, you can change shift pressures, you can change shift speeds/rpms, you can change idle speeds, you can do all kinds of good stuff, the list goes on and on!
You can get a cable at akm cables or pcmperformance.com. I use the latter.
Considering I work for the company who designed and manufactured your PCM, I should know, but we don't have the tools like that, we don't even do any software programming, Ford doesn't want us to. The factory does to a limited extent, but most of the software is programmed by programmers and we solder the memories to the board already programmed. Ford controls the software, we have nothing to do with it and Ford doesn't want us to know much about it. Silly eh?
I work with one of the guys who was the processor guy on the Marauder PCM. But he works on cell phones now....
do you have a leak in you exhaust manifold i have seen this before on a typhoon i had if you dont and you have changed the vcm with a good one then you know its not in the vcm it might be a o2 senser oh and tunercat has the software for your truck i have done few of them
No leaks. Even then, the PCM would see lean, not rich. It thinks it is waay rich (-18.0% LTFT) Both O2's are new and both agree on -18.0% rich. Note -18.0, not -18.1, not fluxuating, a strict -18.0%. Only time it deviates from it is decel and idle. So it strikes me as PCM intentional, but it doesn't make sense why, if it intentionally is doing it, why would it trip a code then???
I have 2 PCM's, stock and tuned, both are the same, -18.0%