foru2nv4

Does anyone know the size of a stock throttle body on a 2003 Mustang GT 4.6 litre? I am curious of the size then I want to upgrade to a larger bbk throttle body because I have a twin screw supercharger on the car right now running the stock throttle body. Any suggestion on the size I should upgrade to would be also appreciated.


Thanks

cliffyk

65 mm, upgrade to a 75 or BBKs new 78 mm TB/plenum combination--but don't expect a gigantic difference. It will be quite noticable but not huge...

foru2nv4

I don't need the plenum because I have a twin screw supercharger that sits ontop of the engine with a stock throttl body attached to the arm of the saleen series IV supercharger. So you say the stock size of a 2003 mustang gt throttle body is 65mm? I appreciate that I think a 75mm on this supercharger will be a big increase for air to the supercharger?





2003 Mustang GT
Saleen supercharger series IV, 4.10s, slp loudmouth exhaust, 30lb fuel injectors, saleen pcm programmed, mass air to 30lb injectors, cold air kit, 160 degree thermostat, 2.91 pulley for supercharger, smaller belt 112.5"

devore86

Do u think the 78mm would be too much for my car, ive been lookin at it, its a good deal.........just not sure

cliffyk

It won't hurt anything to any great degree (a slight decrease in charge velocity at WOT, that will hurt a bit at higher RPMs when the 2V heads don't breath so well), however as long as you run n/a it also won't do anything that a 70 mm TB (and aftermarket plenum) couldn't...

SilvrStang

Dude 75 or 78 mm is an overkill . Yes it will hurt the performance. Go with a 70mm its more then enough on an N/A 2 valve.

devore86

kinda what i figured, its always good to have a 2nd opinion though........thnx

boduke0220

he is supercharged

SilvrStang

Havent read that. N/A 70 MM

75MM would do the job for your twin screw setup.

248spider

after reading your comments that u posted about not going with a 75mm tb, not to be a smart *** but i was looking at your bolt ons and your hp.compaired to what i put on i gained more rwhp from that.i have c&l plenum,bbk75mm tb,bbk cai,and tune by donnie walsh jr.i got 255 rwhp 300torque this was also at 92 degree temps w 30% humidity.i should also add that i have a cheapo pace setter h pipe,and 100,000 stock mufflers.