hypertech programmer
The BEST thing that you can do with one of these tuners is to change shift points. That, and fan settings, are the ONLY useful things the HPP offers IMO. I've used it many times on various cars to up the shift points with great results. The stock rev limiter is 6200rpm, and the stock shifts usually occur around 5900-6000rpm, which is a bit low. If you up them about 1mph on the 1-2 shift, you should not need to change the limiter at all, and it should shift around ~6100rpm without issues. I've personally done this without a problem.
Now, what I have seen people have issues with is getting their shift points correct using the HPP to both compensate for gearing changes AND change WOT shift points. But if you're working with stock gears and stock tire size, this feature works just fine.
FYI, I would not recommend upping the rev limiter much with stock valvesprings, they are not designed for it. Just because it allows 6600rpm does not mean you should use it (you won't make more power up there with a stock cam anyway). You'll probably be ok with 6300, MAYBE 6400, but I wouldn't push it, unless you don't mind the risk.
Overall, these types of tuners are not usually the best option. If you don't have a dyno tuner close, then try the mail order option - I hear great things about Frost.
It has had a couple of Nitrous backfires in it's time and taken out a couple of intake manifolds and a lid. He doesn't run a window switch so it over sprayed into the next gear. ouch. I've bought and sold these tuners for anywhere between $75-125 depending on the market at the time.
The Best V8 Stories One Small Block at Time
you should have a sticker list on your driver side door with RPO codes on it.
GU2 = 2.73's
GU5 = 3.23's

I had 2.73's in my Z28 and still ran low 13's with only full exhaust and street tires on a 2.1 60 foot time.
I must've missed the fact that you were also programming in a different tire height. I have heard of people having issues with HPPs when trying to get shift points correct with a gear and/or tire height change.





