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I found the original computer for my 2001 Z28 and read it. I'm pretty sure the previous owner had a fairly big cam in it, but it was stock when I got it.
If this is a tune for a cam would it be a good place to start if I put a cam back in it? Should I change the things changed in the tuned computer? Then fine tune it from there.
Thanks in advance for any info.
Tuned PCM
Attachment 96028
Tune in use
Attachment 96029
The "as read" file has been monkeyed with (at a glance - spark, trans, idle, injectors, PE); judging by the IFR (and lack of other changes) it had redrilled injectors in there at one point, if your fueling is correct now they were probably swapped back out
I would recommend starting with your current tune or a stock file and working from there - none of the changes made in the "as read" file will make for a better starting point (and I wouldn't say it was put together with a great deal of care in the first place)
What do you mean redrilled injectors?
Maybe it's a nitrous tune, the car had nitrous on it and a bunch of electronics. I bought it as a roller in 2007 and it was one of the fastest street cars in the area a few years earlier until the engine let go. This tune was done by a 'professional' and couldn't have been that bad. I just don't have many details on the set up.
Injectors modified for higher flow by redrilling
Regardless of the combo the tune you pulled was for - cam, spray, otherwise - there's just no real reason to use any portion as a starting point:
The airflow models are stock (they may have put them back to stock, or may have never tuned them and just fudged IFR to give okay fueling)
Spark (HO and idle) isn't tuned in any meaningful way
Injector tables may not reflect the injectors you currently have
Changes in the transmission tables are anyone's guess
The remainder of the changes - deleting TM, changing PE, raising idle - are just bog standard changes
Even if the old tune was perfectly calibrated for the old combo, without knowing what the old combo was and knowing what you put in will most certainly be different, you'll still need to redo all of those tables - unless the new combo is *very* close to whatever the old combo was, the old tune may be no closer to correctly calibrated than stock
Well thanks. I'm just curious if nothing else. I never ran the car with it's original PCM. The engine I bought to put in it came with one and I used it.
It's been in the car 13 years with no problems.