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Old 12-23-2011, 12:41 AM   #1
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Throttle Body Questions

I am really new, I was wondering if I am not planning on forced induction, what would the differences be with the 65, 70, and 75mm throttle bodies on the engine? All I have on the car is a set of long tube headers, flowmasters, and 3.55 gears.
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Old 12-23-2011, 01:49 AM   #2
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First of all welcome!!! Pretty much the difference is better air flow..the bigger the hole the more air that goes in.its like the exhaust system.stock is usually 2 1/2 inches others change it to 3 inch pipes for better flow.hope it helps.
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Old 12-23-2011, 04:02 AM   #3
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Re: Throttle Body Questions

Quote:
Originally Posted by 89Saleen141 View Post
I am really new, I was wondering if I am not planning on forced induction, what would the differences be with the 65, 70, and 75mm throttle bodies on the engine? All I have on the car is a set of long tube headers, flowmasters, and 3.55 gears.
Sequentially larger bores with the 75MM likely being too large for your mods.
With stock injectors I'd go with the 65MM.
With 24lb injectors I'd use the 70MM.

You also need to check the size of your intake opening.
A smaller intake opening can cause some unwanted restriction and turbulence in the air flow and possible hanging of the TB blade.
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Old 12-23-2011, 07:16 AM   #4
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Quote:
Originally Posted by 89 Foxloco
First of all welcome!!! Pretty much the difference is better air flow..the bigger the hole the more air that goes in.its like the exhaust system.stock is usually 2 1/2 inches others change it to 3 inch pipes for better flow.hope it helps.
Sorry it's bugging me, stock is 2 1/4. And bigger is not always better.

---------- Post added at 07:16 AM ---------- Previous post was at 07:16 AM ----------

Quote:
Originally Posted by Trojan Horse

Sequentially larger bores with the 75MM likely being too large for your mods.
With stock injectors I'd go with the 65MM.
With 24lb injectors I'd use the 70MM.

You also need to check the size of your intake opening.
A smaller intake opening can cause some unwanted restriction and turbulence in the air flow and possible hanging of the TB blade.
+1
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Old 12-23-2011, 08:12 AM   #5
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Quote:
Originally Posted by 93slowstang

Sorry it's bugging me, stock is 2 1/4. And bigger is not always better.

---------- Post added at 07:16 AM ---------- Previous post was at 07:16 AM ----------



+1
The 2 1/2"-3" was bugging me also. Was in the middle of something else and about to hunt it down lol Ty for correcting this slowstang! +++
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Old 12-23-2011, 08:23 AM   #6
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Quote:
Originally Posted by 89 Foxloco
First of all welcome!!! Pretty much the difference is better air flow..the bigger the hole the more air that goes in.its like the exhaust system.stock is usually 2 1/2 inches others change it to 3 inch pipes for better flow.hope it helps.
You don't need anything bigger than stock width of 2.25inches. If I remember correctly its enough flow with that width to support up to roughly 380-400hp. Then you jump to 2.5inches up to 550. Then 3inches will hold you from 550+
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Old 12-23-2011, 09:07 AM   #7
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Quote:
Originally Posted by ColeJohnson

You don't need anything bigger than stock width of 2.25inches. If I remember correctly its enough flow with that width to support up to roughly 380-400hp. Then you jump to 2.5inches up to 550. Then 3inches will hold you from 550+
Gonna put that to rest too, 2.5 will open it up nicely, but you are correct about running a full 3" exhaust.

Just trying to set it a little more right
http://www.carcraft.com/techarticles...ion/index.html
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Old 12-23-2011, 01:28 PM   #8
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Quote:
Originally Posted by 93slowstang

Sorry it's bugging me, stock is 2 1/4. And bigger is not always better.

---------- Post added at 07:16 AM ---------- Previous post was at 07:16 AM ----------



+1
My bad on that one..its just I had forgotten about the size since I have the three inch piping..
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Old 12-23-2011, 03:54 PM   #9
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Re: Throttle Body Questions

Thanks a bunch guys. Means a lot.
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