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Old 03-21-2011, 08:22 PM   #1 (permalink)
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Default Match Throttle body size to plenum or not?

I had bought a custom intake manifold a few years back, and I was redoing my setup and finally got around checking the inside diameter of the plenum and my current throttle body, and that I have been running the wrong size throttle body. I measured the plenum to be a minimal of a 72 mm inside, while I have been running a 62 mm throttle body. I have searched on some forums for this answer and could not find an exact one, so I turn to you all for your expertise. Some say to match the size of the plenum, some say to go 2 mm smaller to make a cone effect. What size throttle body should I be running on this intake manifold? Any info will be appreciated at this point. Not sure if it will make any more power, but maybe help out with efficiency/less restriction.

D16Y8 Block
D16Z6 - JGE Pro Series Head
- JGE custom intake manifold
- JGE custom grind cam - 85VT80
Turbo
- T3/T4 .50AR
15~17 psi.
302 whp
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Old 03-21-2011, 08:29 PM   #2 (permalink)
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this has been discussed hundreds of times. search.

start here: Engine Building - D-series.org

hell, i even posted a link to a very good thread with in the last day!



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Old 03-22-2011, 04:20 AM   #3 (permalink)
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You are about to surpass the recommended flow limits on a stock throttle body. Barely. a 60mm MAYBE a 62mm TB could benefit you. But 72? Really?
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intake manifold, match, plenum, size, throttle body

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