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Does anyone know the size of a stock throttle body

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Old 11-11-2008, 11:21 AM   #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, 11:37 AM   #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, 11:49 AM   #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, 05:17 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, 05:23 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, 05:26 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, 05:26 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, 08:04 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, 08:17 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, 08:40 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, 10:03 PM   #11
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Default Thanks silvr stang for your input

Some how everyone got off of what I was askin to sumone else. I will go with a 75mm throttle body for my saleen twin screw series IV supercharger. I think it will make a big difference in what the car is doing now in horsepower.

Thanks Silvrstang for your help.
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Old 11-12-2008, 02:10 PM   #12
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Default Thanks everyone for your reply

What kind of horsepower gain do you think I should gain bolting on a 75mm throttle body onto the arm of a saleen supercharger series IV?
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Old 11-12-2008, 02:25 PM   #13
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What kind of horsepower gain do you think I should gain bolting on a 75mm throttle body onto the arm of a saleen supercharger series IV?
10ish
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Old 11-12-2008, 02:31 PM   #14
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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.
you also probably have a manual. silvrstang has an automatic...
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Old 11-13-2008, 10:46 AM   #15
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I do have a manual on this car.
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Old 11-13-2008, 07:00 PM   #16
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Thank You all you mustang enthusiasts. I bolted on a bbk 75mm to mu saleen supercharger series IV (twin screw) and it was the biggest bang for my buck bolt on I have done. I can get the car ti peel out all the way thru first gear reaving the engine up to 2000 rpms and releasing the clutch and get it to peel out at the beginning of second gear and the grab and take off. Biggest bang for my buck bolt on ever. It was noticeable right off the start after the install.
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Old 11-13-2008, 08:49 PM   #17
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close to 30 horsepower gain using the 75mm throttle body on a twin screw supercharger. If ur doing a cintrifegual supercharger make sure u get the 75mm with the plenum upgrade. This is the first bolt on that I have put on this car that u can feel a difference. It is worth every bang for your buck trust me. Been at this for 15 years betwen camaro's and mustangs and its worth the money. I have a 2003 mustang GT with a saleen series IV supercharger with intercooler SLP loudmouth I catback exhaust, 30Lb fuel injectors, PCM programmed to saleen specs. by saleen, cold air intack with 30Lb maf sensor program and thats it and out of all this the throttle body at 75mm was the biggest impact for my dollars.
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Old 11-19-2008, 06:18 PM   #18
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Go with a 75mm if you are running a twin screw supercharger the hole opening on the arm of the supercharger on a twin screw is big enough for a 80mm but I didn't want overkill so I went with 75mm throttle body and it was an impact on the car.
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Old 11-19-2008, 06:18 PM
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