Hey guys 70 or 65 mm tb?

[remat457]

does anyone have any dyno runs showing a comparison between the tb's?
i have the exact same setup as the guy who started this thread. i think i should go with a 75mm now,

I looked through "5.0 Dyno Tests" and they dyno several TB's but the actual chart isn't really worth much unless you happen to have that exact setup....

BUT....they also conluded:


"Installing a larger 75mm throttle body actually resulted in less power, even on a motor that produced 350 hp with the right combination of components."


so...again it all depends on what you want to do...

 

[mob]

stock is either 55 or 60..

id go with a 70mm

yea i no its 60

 

[89CopCoupe]

70mm is a decent choice for the combo you have. As everyone knows, they work well for a decent 302-347 build. A little bit of a bottleneck will help with port velocity (throttle response on a n/a motor). Dead air sucks

My friend Aidan's '89 306 coupe pushes 305hp/320tq n/a through a "stock" FRPP 65mm unit. I don't know what he'd gain or lose by going to a 70 , but his works and has good throttle response.

 

[Jo_885o]

Alot of back and fourth here. hmmmm..... I'm going with a 70 mm tb and 70mm mass air fella's so thankz anyway.