which would be faster? - Third Generation F-Body Message Boards

rockit · 03-26-2007, 10:00 PM

an l98 topped with the tbi or still with the tpi? assuming both were tuned "right" in the eprom.

i have a chance to pick up a GTA with the l98, wonering howthings stack up between the two systems

UnderCover89TBI · 03-27-2007, 01:56 PM

umm id imagine the TPI would be better deffinately..

Fast355 · 03-27-2007, 03:03 PM

Quote:

Originally Posted by UnderCover89TBI

umm id imagine the TPI would be better deffinately..

If this tells you anything, GM turned a 300 HP longblock into a 250 HP weakling by adding TPI to it.

dimented24x7 · 03-27-2007, 03:59 PM

If the TPI is in place and your just going to drive it as is, you might as well just leave the TPI in place for simplicities sake.

Kevin91Z · 03-28-2007, 01:45 AM

Quote:

Originally Posted by Fast355

If this tells you anything, GM turned a 300 HP longblock into a 250 HP weakling by adding TPI to it.

That crate engine 300 HP rating is GROSS horsepower. The 250 HP TPI rating is NET horsepower. You know that, right?

Werent the 350 TBI's about 220 HP?

rockit, this topic has been debated since before this website existed. Do a search on "tpi vs tbi" and you'll cry from all the dead horses being beaten.

kdrolt · 03-29-2007, 08:11 AM

Quote:

Originally Posted by Fast355

If this tells you anything, GM turned a 300 HP longblock into a 250 HP weakling by adding TPI to it.

That's overstating it.

The heads would have limited the output on a TPI long block. GM didn't even get to 300 fwhp until the Ycar LT1 and that was using a slightly higher lift cam and (LT1 / L31 style) heads that were much improved over TPI on both intake and exhaust.