What size throttle body for my set-up?

BYRDPE · Jul 27, 2007

Combo is in my signature.
My Cobra intake has a 70mm opening.
I already have a 65mm and I can get a 75mm real cheap.
Would I gain anything from the 75 over the 65 and/or 70?
Will a 75mm be too big?

Thanks

Foxfan88 · Jul 27, 2007

doesnt really matter, i doubt you would see a difference swapping over to 75 mm

5spd GT · Jul 27, 2007

No difference with the swap, if you plan on boost in the future, I say go for it.

A big throttle body will not hurt wide open throttle performance. Your engine can only take in so much air either way. The 65mm is doing plenty of air for ya

A bigger throttle body gives you a 'touchier' gas pedal.

BYRDPE · Jul 27, 2007

Thanks Guys.
So no need to upgrade with the ported heads and intake?

5spd GT · Jul 27, 2007

Your correct, it will not be the restriction to your engine at this or that point...

BYRDPE · Jul 27, 2007

Cool...thanks.

Aliate X · Jul 27, 2007

5spd GT said:
A bigger throttle body gives you a 'touchier' gas pedal.

what do you mean? Id like to know as Im going to a 75mm accufab from my stock TB on my hci setup.

5spd GT · Jul 28, 2007

Aliate X said:
what do you mean? Id like to know as Im going to a 75mm accufab from my stock TB on my hci setup.

You will have a bigger blade with a 75mm TB over the stock TB. On the 75mm TB, the blade provides a bigger surface area to hit, so when you open up the blade, it creates a bigger 'hole' at part throttle.

Let's say you depress the gas pedal 20* on a stock throttle body and it let's 20% of your air in. Well if you open up your 75mm TB 20*, you are letting in maybe 25-30% of air...

More air comes in the engine with less pedal push. This can cause a touchier gas pedal...

If your going N/A, a 65 or 70mm TB would flow plenty (Accufab), but if you are getting a blower, the 75mm is just fine You will make gains with your swap, but keep in mind you would make the same gains with the Acc. 65 and 70 All three flow plenty for your engine...

Grn92LX · Jul 28, 2007

Aliate X said:
what do you mean? Id like to know as Im going to a 75mm accufab from my stock TB on my hci setup.

My 75mm accufab isn't touchy at all. No issues what so ever

68keyblr · Jul 28, 2007

If you are going to get rid of your 65mm TB, PM me

5spd GT · Jul 29, 2007

I have drove 5+ cars after a throttle body swap, each time the mm got larger the pedal got touchier...been there done that.

Some people may not think it is touchy, but it will make the pedal touchier...it is unavoidable.

More air intake with less throttle depression...so part throttle performance increases (if you like that), and wide open throttle stays the same...under certain circumstances.

enyawix · Aug 27, 2007

Do you use a bigger throttle body when you get more cubes? I am going 351. I may build it .30 over

5spd GT · Aug 28, 2007

What throttle body do you have now?

What size throttle body for my set-up?

BYRDPE

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