Throttle Body Size?
03-20-2009, 11:43 AM
#1
1st Gear Member
Thread Starter
Join Date: Mar 2009
Location: Ohio
Posts: 84
Throttle Body Size?
Right now I'm going to be putting in my new upper intake to gain more HP and allow for more total HP and new valve covers. While I'm replacing it im thinking of putting in another throttle body but not sure what size to get. Eventually, not this year, I'm going to put either a turbo or supercharger in it. So all that being said what size? 65mm?? 70mm?? 75mm!??? I know I don't have to do it now, but I figured while I had it apart from the upper intake i'd replace it. Lemme know what you guys think.
03-20-2009, 01:36 PM
#6
4th Gear Member
Join Date: Aug 2007
Location: Texas
Posts: 1,788
No, I do not. However, unless he's running a 347 stroker with turbo or supercharger, a 65mm or 70 will suffice. Heck the stock throttle body can easily support 300rwhp, before it starts to hamper flow. There are people running 65mm TB's pumping out 450-500rwhp. It seems the OP is pretty mildly modified(stock heads and cam), so it's safe to assume that either TB's will work fine.
Last edited by NoGo95GT; 03-20-2009 at 01:45 PM.
03-20-2009, 01:47 PM
#8
3rd Gear Member
Join Date: Feb 2008
Location: Florida
Posts: 836
If he plans on spinning rpm with this engine a larger throttle body maybe needed. Combination and goal will dictate what is needed to make the determination. Let me guess, by your theory a 75mm is too large for a 302 or a +900cfm carb is too large for a 289.
03-20-2009, 01:54 PM
#10
4th Gear Member
Join Date: Aug 2007
Location: Texas
Posts: 1,788
I am not saying that at all. But it sounds like you are saying a 65mm would be too small for a 302. I have a 70mm TB. Do you think that it is too small for my boosted combination?If we wan to start this argument between which Throttle body works best, then lets just settle on a 70mm, since it's right in the middle and call it a day.