Just as the title says.

Alot of people just say, O its good for 5. But I really have never seen a actualy dyno before and after of just the TB on a bolt on car.

 

Ya, I did on a stock LT4 with headers n exhaust. Made 331 rwhp with the factory TB and made 331 rwhp with the 58mmTB. Save your money unless you got a few mods.

On a car making about 420 rwhp the 52mmTB was replaced with a 58 (just happened to be mine) and it picked 6 hp. But that was with a car already making 420.

 

Try a "search" on the ProjectTansAM LT1 bulletin board. There was a guy there that dyno'd before and after on a fairly stockish motor and lost 10HP with the 58mm TB. Was a couple years ago, though.

http://www.ws6zxr.com/index_forums.php?

 

....but dont they look pretty?

 

Any dyno's of a 48mm to 58mm on a modified heads/cam LT1?

 

hahah thats funny as hell.

 

well i went from a 12.2 to a 11.87 just by swapping tb to a 58mm it was also less humid out too

 

was that on your 396 in sig?

 

yea

 

I have a ported heads/HOT Cam car with all the bolt-ons. I swapped from the stock 48mm to 58mm BBK right at the track and picked up a tenth and one mph. Later, a dyno showed an increase of 12 rwhp.