what size tb???

jrc_03_gt · Apr 25, 2005

I have a 2003 GT with underdrive pulleys ,cold air intake , Diablo predator, 4.10 gears, and an off road h pipe. I was going to get BBK'S new plenum. What size throttle body should I go with. I want to make sure I dont go too big on the tb because I dont want it to be a turd down low. I dont want to have any kind of torque loss in lower range. What do you think?

ab 281 gt · Apr 25, 2005

70mm for n/a
75 or 80mm for f/i

Gearbanger 101 · Apr 25, 2005

You might as well go with the 75mm right off the bat. The bigger throttle body hasn't been shown to hamper low-end and part throttle performance on a N/A 4.6L like it used to on an old 5.0L. Starting bigger in the first place saves you from needing to upgrade later on when/if you decide to push the power levels further.

jrc_03_gt · Apr 25, 2005

2 replys 2 different answers.

StangPro · Apr 25, 2005

Go 75, there's no downside. I know someone will quote the MD testing, but that was one instance. If you plan on more mods, go 75.

We did the Dragon 75mm TB on a bone stock '04 GT with the Dragon plenum and got nice results and great driveability.

http://www.stangpro.com/html/articles/dragon.htm

Gunfighter · Apr 25, 2005

70mm if staying n/a; 75mm (or more) if a blower is in the very near future. I wouldn't worry too much about TQ loss in the low end, though, the 4.10's and a good flash tune will more than make up for the loss.

BlackenedSVT · Apr 25, 2005

Gearbanger 101 said:
You might as well go with the 75mm right off the bat. The bigger throttle body hasn't been shown to hamper low-end and part throttle performance on a N/A 4.6L like it used to on an old 5.0L....

yes it has.

Go with the 70mm T/B & Plenum Combo (accufab)
I agree with one of the other guys that said:
- 70mm for N/A and
- 75mm+ for Power Adders

Gearbanger 101 · Apr 25, 2005

UDTBadkarma said:
yes it has.

Show me....prove me wrong!

mto gt2000 · Apr 25, 2005

Im switching to a 75 because I am going s/c sometime in the summer. If you decide to go with a 70 I have a ford racing tb I will sell you for a good price.

what size tb???

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