Throttle Body Size: 70mm or 75mm?

A

Apollo Creed

New Member

Jun 16, 2004

14

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0

Jun 16, 2004

#1

• Jun 16, 2004

• #1

I have a 99 GT. The only current mods on it right now is a Cold Air kit, Off-Road H-Pipe, American Thunder Cat-Back. The only other performance mods it will see is shorty headers, 3.73 gears, and possibly underdrive pulleys. I plan on installing the C&L plenum. My question is shoud I go wth a 70mm or 75mm throttle body? I know most of the people here have went with the 75mm but I was told by several people that it may be too much air and I cold run to lean. They advised me to go with the 70mm. Any input?

 

stang976

New Member

Apr 13, 2004

853

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Westchester, NY

Jun 16, 2004

#2

• Jun 16, 2004

• #2

in your case i would go with the 70mm. with your applicationn and a 75mm your bottom end may not be as spunky

 

ProCharger GT

Member

Jun 3, 2004

153

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16

Cleveland

Jun 16, 2004

#3

• Jun 16, 2004

• #3

70mm on N/A buildup. 75 would be overkill unless your running a blower application.

 

A

Apollo Creed

New Member

Jun 16, 2004

14

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0

Jun 16, 2004

#4

• Jun 16, 2004

• #4

Thanks guys!

 

Barker02GT

New Member

Mar 17, 2004

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SC

Jun 16, 2004

#5

• Jun 16, 2004

• #5

On Accufab's website, which is what I have, they show that even on a NA motor that the 75 makes more power than a 70. Not drastic as if you were adding a blower and a 75 of course, but still gains nontheless. However, as stated before the power band for a 75 on a NA motor will be different than a 70.