Thread: Tune acting different at home vs track

Somebody please tell whats wrong with my 2001 GTP i live in Northern Utah and travel down to RMR maybe once a month. I just did a bunch of work this spring and my car runs like crap down the track but awesome up here. my mods include block bored .20 over, XP cam, balancer shaft removed, OE-R 875 lifters, #105 springs and retainers, powerlog headers, ported SC and ported lower intake. ported TB. and a some what cold air intake (warm air intake) it doesnt go down the fender like it should. and 3.2 pulley. And a tune on the PCM. the problem im having is i cant break 15.0 seconds to save my life, its driving me crazy everyone i talk to say i should be in the low 14.0 high 13.0. Please dont quote me on that the first of the season i had bald radial tires and a 3.4 pulley and i ran 14.8 all day. Thank you for all your opinions you might have for me.

I think West Valley, UT is like 4200 and up in Logan im maybe only 4300 or 4400 tops we are in a valley so smog gets trapped up here as much as Salt Lake. i tried the driver mods and that didnt work.

Originally Posted by jwduke01

Somebody please tell whats wrong with my 2001 GTP i live in Northern Utah and travel down to RMR maybe once a month. I just did a bunch of work this spring and my car runs like crap down the track but awesome up here. my mods include block bored .20 over, XP cam, balancer shaft removed, OE-R 875 lifters, #105 springs and retainers, powerlog headers, ported SC and ported lower intake. ported TB. and a some what cold air intake (warm air intake) it doesnt go down the fender like it should. and 3.2 pulley. And a tune on the PCM. the problem im having is i cant break 15.0 seconds to save my life, its driving me crazy everyone i talk to say i should be in the low 14.0 high 13.0. Please dont quote me on that the first of the season i had bald radial tires and a 3.4 pulley and i ran 14.8 all day. Thank you for all your opinions you might have for me.

Post logs/scans...

What timing, what afr, any KR?

Not sure on the timing you guys can chew me out but its a ZZ Performance tuned pcm, no KR, AFR is normal unless im cruising at 65 mph for awhile then it goes alittle to the rich side.

Sweet thank you anybody know where i can get it re-tuned in Utah? What does a tune run price wise? Yeah when i got the cam from ZZP i sent in my PCM to have it programmed for the cam but i thought it was kindof odd they didnt ask questions like what altitude im in, and what other mods do i have and so on.

Well, scan your commanded timing, and tell us AFR... we cant suggest anything without this information..

If your maf is reading the same amount of air while giving you a good airfuel ratio output... and you make the same timing... there is nothing wrong with your tune.

Too many people are on the "you have to get it tuned" bandwagon on this forum... and as a tuner of almost 7 years now, I can say that mailorder tunes are much better than people think they are (hell factory stock tunes are pretty awesome on most things as well).

Ported tb, xp cam, 3.2 pulley on a mail order tune in his location?

Ported TB's are a pain in my ass.. but for the most part just because it has a cam, it does not need any special attention... The maf sensor could care less what cam is behind it... its still going to read the amount of air coming in.