is the bbk 78mm throttle body worth it?
01-27-2012, 10:58 PM
#3
revert to stock to trade in, is what his reason was, i did search seems like 70mm is the prefered setup, but there is a 80% chance i F/I this stang before too long, so it would hurt to have the 78mm, but i dont want it to hurt me until i get F/I
01-27-2012, 10:59 PM
#4
wouldn't hurt* , if he didnt want my stock setup i would just buy it and hang onto it just in case, but i dont wanna downgrade performance with such a big throttle body, with the hope the i turbo or supercharge it in the future
01-28-2012, 04:23 AM
#5
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
78 mm is too big for n/a on the 2V engine, and somewhat counter-intuitively won't do much for f/i when running a centrifugal blower or turbo unless you're running pretty high levels of boost. Once you start pushing air into the engine the manifold/lower plenum, and that there's only two valves per cylinder¹, become become the weak points.
That said, it's negative impact on n/a performance won't be a big deal at anything but higher rpm (5000+) WOT, and you get bragging rights when talking with people that don't know any better--which is most of them...
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¹ - An example of how the 2V heads affect performance can be found with my "little" 400 cc (actually 385) scooter. It is EFI, has a 4V head, and puts out 24 rwHP (32 fwHP claimed. the CVT drive eats up 25%).
That's 83 fwHP/liter, from the factory.
Compare that to my bolt-on, well tuned (if I do say so myself) 4.6L 2 V '03 GT, that peaks at 262 rwHP, probably 308 at the flywheel --or a lousy 67 fwHP/liter...
That said, it's negative impact on n/a performance won't be a big deal at anything but higher rpm (5000+) WOT, and you get bragging rights when talking with people that don't know any better--which is most of them...
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¹ - An example of how the 2V heads affect performance can be found with my "little" 400 cc (actually 385) scooter. It is EFI, has a 4V head, and puts out 24 rwHP (32 fwHP claimed. the CVT drive eats up 25%).
That's 83 fwHP/liter, from the factory.
Compare that to my bolt-on, well tuned (if I do say so myself) 4.6L 2 V '03 GT, that peaks at 262 rwHP, probably 308 at the flywheel --or a lousy 67 fwHP/liter...
Last edited by cliffyk; 01-28-2012 at 05:13 AM.
02-04-2012, 01:28 AM
#9
Join Date: May 2010
Location: Sahuarita(Tucson), Arizona
Posts: 29
On mine I have PI heads, so the extra air did help with the increased compression...
I really only 'feel' the difference over 5000RPM. I did pick up a few more ponies from 3500-on on the syno, but nothing wild!
Not sure I'd recommend it with a mostly stock motor...
I really only 'feel' the difference over 5000RPM. I did pick up a few more ponies from 3500-on on the syno, but nothing wild!
Not sure I'd recommend it with a mostly stock motor...
