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Old 11-11-2008, 12:21 PM   #1
foru2nv4
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Default Does anyone know the size of a stock throttle body

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.


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Old 11-11-2008, 12:37 PM   #2
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Originally Posted by foru2nv4 View Post
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.


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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...
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Old 11-11-2008, 12:49 PM   #3
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Default Dont need the plenum

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?





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Old 11-11-2008, 06:17 PM   #4
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Do u think the 78mm would be too much for my car, ive been lookin at it, its a good deal.........just not sure
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Old 11-11-2008, 06:23 PM   #5
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Do u think the 78mm would be too much for my car, ive been lookin at it, its a good deal.........just not sure
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...
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Old 11-11-2008, 06:26 PM   #6
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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.
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Old 11-11-2008, 06:26 PM   #7
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kinda what i figured, its always good to have a 2nd opinion though........thnx
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Old 11-11-2008, 09:04 PM   #8
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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.
he is supercharged
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Old 11-11-2008, 09:17 PM   #9
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Havent read that. N/A 70 MM

75MM would do the job for your twin screw setup.
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Old 11-11-2008, 09:40 PM   #10
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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.
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.
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Old 11-11-2008, 09:40 PM
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