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70mm Throttle bodys? worth it?

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Old November 21st, 2012, 04:23 PM   #21
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On back to back dyno test At exotic engine development ,my slightly warmed over 2001 GTS motor is (11:1 forged pistons, 708 cam and slow blead lifters) my motor didn't make any more horsepower, but it did create a lean spot between 2000 and 3000rpm
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Old November 21st, 2012, 04:25 PM   #22
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Oops I mean 2500 to 3000
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Old November 24th, 2012, 10:23 AM   #23
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Underground Racing wanted my stock throttle bodies over my 70mm Accu Fabs, so I sold my 70mm. I still have more power than I know what to do with.
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Old November 26th, 2012, 09:29 PM   #24
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The big reason the 70mm TB don't do much above 3000rpm is because of the intake mani doesn't flow enough to make it worth it. Yes below 3000rpm it is pretty good. But above that the intake mani just will not flow the air.

So on a ROE, they are ideal, on a N/A engine it does help (with throttle responce and low end.) But in the upper RPM's, doesn't do alot.
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Old December 3rd, 2012, 12:13 PM   #25
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Thought I'd throw up some pics as I do the install. My car will be down at least until Friday because one of the intake gaskets tore, but here is what I have so far.

Rag stuffed in the first inlet, Dremel'd and vacuumed out:


One done, one not:


Approximately how much material needs to come off to accommodate the Accufabs, using the new gasket as a template:


Previously in the thread, it was mentioned that you'd need ~20 of these to get all the material off. I am getting closer to 30, but that's only because the Dremel attachment that holds the sanding drum is losing it's grip on these, so they're getting less and less effective. By the time I got to the middle of the second inlet, the sandpaper would spin off of the attachment within 5-10 seconds. I went and bought a second attachment today so I can wrap this up with my sanity.


Stock vs 70mm:


Hopefully my car works when it's put back together.
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