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What size TB to go with [Archive] - StangBangerz Forums
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Steves LX
03-30-2008, 09:52 AM
I currently have a 70 MM TB on the car right now and I also have a 75MM TB. I need some advise on which one is going to net me more at the track. And any ideas how much more one is going to benefit vs the other.
Timido
03-30-2008, 10:31 AM
You probably wont see much if anything from a bigger TB. If you dont have coolant going through your egr spacer make a pass or 2, then put the 75mm on at the track and make a pass or 2. Compare both ETs and MPH then let us know which worked better. The performer intake you have might only be cast for the 70mm size
Buckeye
03-30-2008, 05:00 PM
Sell me the 75!
12seclx
03-30-2008, 06:33 PM
I currently have a 70 MM TB on the car right now and I also have a 75MM TB. I need some advise on which one is going to net me more at the track. And any ideas how much more one is going to benefit vs the other.

Put the 75 on!

I gained 12.4hp/11.9 ft. lbs. on the dyno....
Switching from a 70 to 75....

:wave:
Timido
03-30-2008, 07:25 PM
See you wont know till you try. Thats anouther Idea go to the Dyno and try both and report back to us.
PaulFiveOh
03-30-2008, 07:44 PM
Put the 75 on!

I gained 12.4hp/11.9 ft. lbs. on the dyno....
Switching from a 70 to 75....

:wave:

Wow! On a N/A setup?
12seclx
03-30-2008, 09:24 PM
I'm just messin' with Steve.....
;)

I agree with Timido, probably little gain to be had...
Best thing to do is try both at the track.... I talked to
Rocky a couple years ago and he was doing this same thing....

I'm real fond of the Accufab race throttle bodies myself.....
PaulFiveOh
03-30-2008, 09:27 PM
Lol. Noob Pawnage.

Katmandu (I think) brought up a good point to me one time, he said you want to your entry point to be your maximum volume then have it taper down to the entry point being the smallest volume in an attempt to increase the velocity of the charge and to find the intersection between max flow volume and max flow velocity.

Seems like a good point. Thoughts?
12seclx
03-30-2008, 09:35 PM
Lol. Noob Pawnage.

Katmandu (I think) brought up a good point to me one time, he said you want to your entry point to be your maximum volume then have it taper down to the entry point being the smallest volume in an attempt to increase the velocity of the charge and to find the intersection between max flow volume and max flow velocity.

Seems like a good point. Thoughts?

That's a real good point... I agree....
The throttle body I have has a 90mm opening then tapers down to 75mm
at the blade.... pretty cool if you've never seen one before... :bigthumb