Throttle bodies

**blownaway** · 04-09-2003, 01:12 AM

What size are you all running? Are there issues with bottom end power on the bigger ones?

**midnight** · 04-09-2003, 07:10 AM

65mm.there could be some low end torque loss if too big..i have 600+rwhp w/the 65..as u prob already know the bigger the TB opening the less speed a same given amount of air w/travel thru it.(Volumetric efficiency) however,the loss could be made up on top in all out race car..prob not on street though..bigger is not always better except in cubes in my exp's/opinion..too many folks are running way too big tb's as proven on dyno(unless that is the flow restriction)normally it's the heads, not tb...

**bumblebee03** · 04-09-2003, 07:20 AM

I am running a 65mm TB as well,,, Not too long ago I saw a write up on a TB that had interchangable venturies,,,, it was pretty trick,, I think w/o any venturi it was 75mm,, but you can add the venturies to make it either 70 or 65mm,,, you should look around for that one,, then you can experiment,,, Bee

**Redsnk95** · 04-09-2003, 12:19 PM

I run a 70mm now, when air is being forced in you can get away with a bigger throttle body. I did run some 11.80s @ 120 a few years ago with a stock 60mm tb.

Troy

**MoDo** · 04-09-2003, 06:37 PM

mine is 75mm

**blownaway** · 04-09-2003, 08:22 PM

I have a 70mm right now, it isn't good right now cause I am breaking in the motor without the S/C . I had a buddie who needed a bigger tb so he got my 65mm, I think I want it back! Maybe it will get better with the S/C, will it?