hey guys, have a quick question.. I am building a forged 355 . Le1 heads, 226/230 cam. 11.4 CR (9.0 DCR) .. and all supporting mods.. My question is, How much power can I gain realistically from going from a 48 mm to a 58 mm TB? ..

AND my intake is fully ported as well... opened up for 58mm tb... Thanks

 

ttt ttt

 

If I can save a couple of bucks, I will.. Then later just upgrade to a 58 MM and see if my ET or MPH improves .. ?? I doubt Ill gan even 10RWHP

 

ok guys, i used the search feature.. It took me a while to find a good thread, but It seems the stocker will get the job done for me ....

 

If it were me I would spring for a 52MM or 58MM TB. I have a 58MM TB on my stock bottom end LE2 car and it works very well for me. Since you have the manifold opened up to accomodate the 58MM TB I say got for it. I have a Professional Products unit that ran me under $200 new and works awesome.

 

thanks for the input.. i will eventually get a 58mm. But im gonna run a 48 for some time, then swap in a 58.. then do back to back runs and see if I gain any at the track... Or dyno for that matter

 

I wouldn't swap the 58mm TB on untuned for, especially for a auto car.

 

yes, ive heard of driveabilty probs, especially on a4's.. lets say i tune for a 58, but run a 48mm ?? any cons??

 

The stock throttle body is not holding you back.