70mm TB Hurt or Help?????????????

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projectfiveo

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Aug 30, 2005

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Sep 5, 2005

#1

• Sep 5, 2005

• #1

OK in the future i plan on getting a Trick Flow Street heat manifold, but for atleast 6 or 7 months im going to be stuck with the stock one....so my question is since i already have a 70mm TB laying around here would it HURT or HELP me to go ahead and install it with my stock manifold and cold air??? alot of people say it will help and i have also heard it will hurt me so.................??? what do you all think?

 

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IntenseBlue

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#2

• Sep 5, 2005

• #2

I think it'd be fine.

 

DW5.0L

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May 28, 2005

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Sep 5, 2005

#3

• Sep 5, 2005

• #3

The TFS has a 75mm opening. An unported stock intake probably does flow well enough to take advantage of a larger throttlebody. You may actually lose some power.

 

vikingpower

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Dec 6, 2004

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Sep 5, 2005

#4

• Sep 5, 2005

• #4

losing power from a bigger TB is a myth. The only thing you might lose is tip-in throttle response, even then, its negligible. Just remember to port-match the TB to the manifold before you put it in

 

Grn92LX

Fidanza Man!

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Sep 5, 2005

#5

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• #5

Yep. Putting a 70mm tb on a 60mm opening creates a 10mm wall for air to hit and disrupt flow. That is pretty dumb. You have to port match the inlet to do it right. The 70mm tb will work fine on your tfs intake when you get it.

 

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projectfiveo

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#6

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ok call me stupid but how do i port-match the TB to make it work better?

 

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projectfiveo

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#7

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and if im going to actually loose power it isnt going to be worth it??????

 

Grn92LX

Fidanza Man!

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#8

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You have to port match your inlet to 70mm. Then when you get the tfs intake you have to spend another $10 on new tb gaskets. I say leave it off for now unless the intake isn;t comming anytime soon then do it now and break out the dremel and port match the inlet to 70mm. Do NOT do this with the upper intake still on. Take it off and then buy a new upoper intake gasket!

 

gruvee87vertgt

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Oct 7, 2003

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Sep 5, 2005

#9

• Sep 5, 2005

• #9

I have a 70 mm on a stock intake....works great. I will be throwing on a 75 mm in a couple days....I will let you know.

 

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projectfiveo

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Sep 5, 2005

#10

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are you talking about the inlet to my manifold that needs to port matched?

 

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projectfiveo

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#11

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gruvee87vertgt what all did you do when you installed yours??? and could you tell a difference when it was installed?? or about the same?

 

Henceforward

The Avatar Master

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#12

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• #12

You don't have to port match it per say, but you need to taper it a little to ease the flow between that 10mm step up.

Here is the entire how to...

http://mustangandfords.com/howto/29458/

 

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projectfiveo

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Sep 5, 2005

#13

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well im pretty sure i have a stock 65mm throttle body but i could be wrong? so it would only be a 5 mm difference?? would that make alot of difference if i just left it like it was with out grinding it out?? im just afraid of messing it up???

 

legalize420

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May 21, 2005

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Sep 5, 2005

#14

• Sep 5, 2005

• #14

projectfiveo said:

well im pretty sure i have a stock 65mm throttle body but i could be wrong? so it would only be a 5 mm difference?? would that make alot of difference if i just left it like it was with out grinding it out?? im just afraid of messing it up???

Click to expand...

stock is 60. if it were me i would wait. i tryed a 70 on the stock intake and the throtle response sucks.