Headers HP for a auto?

[Ragtop George]

My stock 0-60 time was about 9.5 seconds. Granted, this is with the heavier convertible and with about 8-9% loss due to altitude. Even so, your 7.5 second stock time sounds optimistic, I think 8 seconds is more likely. With the stock pulley, you should be up by 22-25% in acceleration, so working back from your 6.4 second time, 8 seconds sounds about right. The 2.75" pulley gained me about 10% in power, but at your lower altitude and higher temperatures in Texas, you may not gain as much due to detonation and the associated timing pullback by the engine computer. Still, if you have a sense of adventure, go for it!

George

[Flipside909]

:o woa...35% increase in 0-60 with auto ???now i understand that u have an upgraded pulley...however with the stock pulley i only noticed about a .7-.9 sec. difference....before s/c my car did about 7.5 i think...now with the 4psi pulley(stock) it does about 6.4 or so...so with a 6 psi pulley ur saying ill be under 6 secs easy? IF thats true i cant wait for my car to be done i have a 6.2 psi pulley..hehe...by the way: FLIP...any comments? L8r moe

And you're getting these 0-60 times from what? Show us some real time slips instead of estimation and assumption from the butt dyno.

[xXsolaraXx]

ummm ok so i mite be a LIL off on the 0-60 sue me! hehe! i was just trying to make a point that 30% power time increase is almost impossible for the s/c on an auto...am i right? L8r moe