Stock Throttle Body - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 02-03-2013 Thread Starter
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Stock Throttle Body

Can anyone tell me what the dia. of the stock 4.6L v8 throttle
body is ?
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post #2 of 11 (permalink) Old 02-03-2013
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I believe it is 65mm.

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Meziere electric W/P & 170 stat, C&L air filter system, Summit & March U/D pulleys, FRPP 70mm throttlebody, Perf Prod. plenum, FRPP alum. D/S & 4:56 gears, Auburn Diff, Alloy axles, Revmax 3000 stall conv. UPR rear upper & lower control arms, Lakewood drag shocks & struts, Eibach rear drag springs, SCT chip & tune, Flowmaster mufflers
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post #3 of 11 (permalink) Old 02-03-2013 Thread Starter
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Thanks for the reply. I thinking about a bigger throttle body,but can,t decide how big to go. The engine is stock other than FlowMaster system and then BBK CAI.
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post #4 of 11 (permalink) Old 02-03-2013
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75mm throttle body and c&l intake plenum combo worked great for me from American Muscle
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post #5 of 11 (permalink) Old 02-04-2013
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OP,

Tons of our 2v GT customers run the BBK 78mm Throttle body Intake. It's a very nice affordable part, that replaces the TB and upper intake, as one. Which is especially helpful since the stock upper intake is very restrictive. We've seen solid gains of 12-15hp over stock. I think it's exactly what you're looking for.

Let me know if you have any questions!

Shane

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post #6 of 11 (permalink) Old 02-04-2013
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Quote:
Originally Posted by zachyd23 View Post
75mm throttle body and c&l intake plenum combo worked great for me from American Muscle
I would go with this or a 70mm but no bigger then 75mm.

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post #7 of 11 (permalink) Old 02-04-2013
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Go 75mm, but do the upper plenum as well, that is a major restriction in the stock setup. Have not seen a single drawback from going 75 over 70 and it has some room to grow later.

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post #8 of 11 (permalink) Old 02-04-2013
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Quote:
Originally Posted by racin366 View Post
Go 75mm, but do the upper plenum as well, that is a major restriction in the stock setup. Have not seen a single drawback from going 75 over 70 and it has some room to grow later.
I know there have been a million threads on it, but do you think there's any torque reduction going from 70 to 75? Assuming replacing the plenum at the same time.

2002 Mustang GT: 5-spd, 78k: CAI, IAC restrictor plate, Steeda Tri-ax shifter, Mac Prochamber O/R, Borla Stingers
1997 Mazda B2300 5-spd: a 4.6 cut in half
1972 Yamaha CT2 175cc: 2 stroke, also a 5-spd
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post #9 of 11 (permalink) Old 02-05-2013
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Is the gain worth the cost?

Lesky claims 12hp. Is that on a completely stock car, no tune? Or is that the sales pitch? Lol
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75mm unless you plan on going with forced induction in the future, go with something bigger.
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Quote:
Originally Posted by Hood Time View Post
Is the gain worth the cost?
That is something only you can answer. It shows gains across the rpm's and some better response, but what that is worth is up to you.

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