Discuss What size throttle body is stock on my 98 GT? on AllFordMustangs.com, the place for Mustang enthusiasts.
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if you were to go with a bigger throttle body, would you need bigger injectors? If so, what kind?
~1997 Mustang GT Laser Red w/2000 GT Rims~
5 speed HURST
Bassani O/R X Pipe w/Borla Mufflers
Home Made Ram Air/Cold Air
Removed Air Silencer
K & N Air Filter
MW “MUSTANG GT” Inserts (Silver Metallic)
Gas Pedal Mod
NITTO EXTREME ZR 555- 245/45/ZR17
1998 Cobra Leather Shifter knob
Removed MAF Post
New ‘RECALLED’ INTAKE MANIFOLD
White Face Gauges
Center Force II Clutch
MSD 8.5mm Wires
I thought the stock throttle body on the 2000 GT was 70 mm but was restricted down to 60-65mm. And then once I replaced it with a Ford Racing Throttle body, it was a true 70 mm throttle body with no restrictions.
i placed my stock 65mm TB up against the 70mm and low and behold there is a difference. the stock intake opening where the TB mounts to is already 70mm. the stock TB is where it is reduced to 65mm. Upgradeing to the 70mm you may feel a decrease in low end torque for a slight increase in HP >8HP. I'm probably going back to the stock TB because I want the torque and the 65mm is good till around 400HP, so I've heard.
Search the posts for TB questions and you will see many pro's and con's pertaining to the 70mm TB's