Originally Posted by wssickk

We'll I'm going auto so I'm going to go with a bigger tire

Originally Posted by thunderstruck507

What does it weigh with you in it? I've seen Trans Ams weigh over 3800lbs with normal sized driver if they don't have weight reduction or maybe have added things like an amp sub

How is your shifting? Lazy shifting will kill your times

Are you going by the stock tach? It can be off a large amount at WOT. A computer log that shows where you actually shift would be useful. You need to shift at least 6500rpm actual engine RPM I would think...where did it make peak HP on the dyno? Add several hundred RPMs to that. I doubt it peaks before 6200rpm.

Where are you getting that compression ratio? Stock ls1 is 10:1 and the stock ls6 heads would bump that to around 10.5:1, that is a long way from 11.9:1 (not that it matters as far as your track times)

Originally Posted by HCI2000SS

It has nothing to do with the tire diameter! What rpm do you shift at? Are you a decent shifter?

Originally Posted by madmike9396

you got any videos

Originally Posted by madmike9396

try shifting at 6500

Originally Posted by madmike9396

lets hope it improves

Originally Posted by madmike9396

What converter you using ?

Originally Posted by HioSSilver

Good luck with this one guys.

Originally Posted by LS1rob00

That makes absolutely no sense but do what you want. Unless you are running out of gear or adding a significant amount of power you don't need bigger than a 26" tire right now.

Originally Posted by 62nalide

X2, wonder what gear OP is running. What was the DA on that run? Car should see mid 11s as it sets. OP is running slower than a good bolt-on setup IMHO.

Originally Posted by Holloway5

Should figure out the issue before swapping. Typically with an auto you will trap even lower than a M6, but ET better.