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Is a 65mm mustang throttle body really necessary???

L

LukeDuke

CEG'er
Joined
Oct 25, 2005
Messages
179
Location
MN
Hey guys,

been reading up and cant find a few answers to this question. to people that have a 65mm tb, was it worth it? and what year tb is the one we need for either the svt 2.5 or a 3L.

and what all needs to be done to it for it to work the best for say a 3L turbo?

any info regarding this would help. i tried searching but it got confusing and not too much out there.

thanx in advance.....
 
No, it isn't necessary. In a realistic back to back, all else equal, engine dyno comparison, it will only give you 1-2 hp, at the expense of poor low throttle opening performance because the engine calibration wouldn't be optimized for it. For a turbo application, the improvements would be smaller than the inherent variation in measurement from different dyno runs. And I have seen the back to back engine dyno data that supports these statements.

A larger throttle body would only be a real necessity if you had significantly ported the heads, and had a larger custom intake manifold.
 
In theory, it would be about right for a 3.0 with SVT cams. A 3.0 provides 20% more displacement. With proper valving and porting (might be a big if) a throttle body with 20% more area than the stock 60mm SVT throttle body would be a 66mm throttle body.

It would certainly be worth trying on a 3.0 conversion with SVT cams.
 
ok cool, im planning on going 3L with svt cams in the future so i wanted to find out what would be best to use. or if optimizing stock is just as good. any other comments feel free to add.....
 
has anyone had problems with a opt. TB. i read some were that the countersunk screws cause problems. but i don't know.
 
If you follow the howto and use a drill bit to countersink the throttle plate, you'll run a high risk of the holes not being properly aligned... so the plate would not close properly (idle issues). Using a drill bit is ghetto... you should always use a countersink bit when countersinking.
 
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