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Which intake combo to use on a track car?

Old 08-08-14, 02:49 AM
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Which intake combo to use on a track car?

I was wondering if I should use a s4 upper and lower or a s5 upper with s 4 lower on my track car? Any help? It is a s4 6 port na block, that I might turbo at a later time.
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Old 08-21-14, 04:06 PM
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Old 08-24-14, 04:56 PM
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try both! the upper manifolds interchange, so you can run the lower intake of your choice, and then try each upper.
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Old 08-24-14, 07:02 PM
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I dont have much to ad to this fight, but ive heard that the S4 lowers have shorter and more direct runners. To maximise my de-actuated S4 lower, I removed all my 6-port actuators and associated nonsense , filled in all the remaining holes with JBweld and smoothed and ported the remaining, as well as also knife edging the small divider between the pairs of secondary ports
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Old 08-25-14, 11:30 AM
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Thanks, any suggestions on which porting to run on a track only car, we run in the chumpcar endurance series.
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Old 08-26-14, 12:42 PM
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Originally Posted by Diver22 View Post
Thanks, any suggestions on which porting to run on a track only car, we run in the chumpcar endurance series.
if you aren't limited by the rules, go peripheral, everything else is a waste of time...

with the S4 vs S5 manifold you're talking about the difference between 155 and 160hp, with a peripheral you're starting at ~230rwhp.
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