throttle body change on stock motor. how big can i go??

Foxfan88

My Grandpa has great wood.

Sep 13, 2004

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Miami, Ok

Dec 26, 2005

#1

• Dec 26, 2005

• #1

hey is it even worth it to grab a bigger TB for a stock motor??
Keep in mind, i am building a motor thats going to have heads and cam etc.... So if its not exactly great with my stocker, it will work well with the new motor.... so it wont be money wasted

So will a bigger TB create slower throttle response??

 

jrichker

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Mar 10, 2000

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Dublin GA

Dec 26, 2005

#2

• Dec 26, 2005

• #2

Stock engine = 65 MM TB. Not much HP will be gained without a change to an improved intake manifold.

Stay away from the 70 MM and larger unless you are going to a stroker engine or Forced Induction.

 

aleborjas

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Sep 11, 2005

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Dec 26, 2005

#3

• Dec 26, 2005

• #3

i have a 306 with 185's, typhoon intake stage 2 ported, XE274HR cam, 1 5/8 lt's, 2 1/2 pipes and i alreay bought the 70TB is not instaled i have right now stock one, can my 70TB work on my engine or i am goin to lose power what can i do?

 

I

IntenseBlue

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Jul 10, 2005

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Dec 26, 2005

#4

• Dec 26, 2005

• #4

aleborjas said:

i have a 306 with 185's, typhoon intake stage 2 ported, XE274HR cam, 1 5/8 lt's, 2 1/2 pipes and i alreay bought the 70TB is not instaled i have right now stock one, can my 70TB work on my engine or i am goin to lose power what can i do?

Click to expand...

70mm should be perfect for yours.

As for the original post, would a stock H/C engine benefit from a 65mm throttle body?

 

aleborjas

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Dec 27, 2005

#5

• Dec 27, 2005

• #5

can i run 30pounds with my engine or stock ones?
i have stock ones and 30 pounds with 75mm maff
what should i run?

 

I

IntenseBlue

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Jul 10, 2005

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Dec 27, 2005

#6

• Dec 27, 2005

• #6

aleborjas said:

can i run 30pounds with my engine or stock ones?
i have stock ones and 30 pounds with 75mm maff
what should i run?

Click to expand...

With AFR185s, I'd run 30s before I'd run 19s.

 

Michael Yount

Mustang Master

Apr 10, 2002

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Charlotte, NC

Dec 27, 2005

#7

• Dec 27, 2005

• #7

The bottleneck to flow on the stock engine is the lower intake manifold. If you want to get some bang for you buck right now, go ahead and buy your intake and put it on. That will make a difference in peak power. Putting the larger t/b on won't make a significant difference since the bottleneck to flow is downstream of it. And a 65mm t/b is sufficient for just about any streetable naturally aspirated 302.