Sheetmetal Intake Manifold possible? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 10-02-2006, 04:03 PM   #11
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Lovely, like you said, let'* get the ball rollin'....

I love the word "cheap".
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Old 10-02-2006, 04:06 PM   #12
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Just for reference for those that don't know or aren't sure, long runners are good for low end torque and horsepower. Short runners are good for high-end torque and horsepower.
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Old 10-02-2006, 04:09 PM   #13
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Quote:
Originally Posted by willwren
Just for reference for those that don't know or aren't sure, long runners are good for low end torque and horsepower. Short runners are good for high-end torque and horsepower.
Thanks I didn't know that.

I want the short runners....
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Old 10-02-2006, 06:15 PM   #14
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One thing you do not want to do is remove the plastic runners from the UIM completely. This has been tried by a few GPGTers at the track with negative results.
ZZP'* HVII (http://www.easyperformance.com/ article in tech info) replaces the runners in the UIM with a smoothed bellmouthed transition.
This jump down in take runner length has been found to be way too sort to see 1/4 mile gains on a realtively stock car. (no cam or rockers)
They don't produce this anymore though so you would need to find a second hand piece.
The plastic intake runners could be cut a few different ways to shorten the runner length. The hard part would be keeping everything together in there since they are joined at the top.
And theres always swapping over an F-body upper/lower intake combo for the shorter runner length. Thats is lot of work and I have yet to see any gains from it.
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Old 10-02-2006, 06:28 PM   #15
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I'm looking at a couple ways of modifying the OEM UIM to allow a shorter runner length and perhaps even selectable, semi-automatic, or fully automatic. (L36).
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Old 10-02-2006, 07:22 PM   #16
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So my old UIM is going to be a test subject?
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Old 10-02-2006, 07:24 PM   #17
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Quote:
Originally Posted by EK98
So my old UIM is going to be a test subject?
If I can talk Bob Dillon into letting me keep it.
Or send him another core.
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Old 10-02-2006, 11:18 PM   #18
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when you say that the longer runners make more low end power does that mean you lose a lot up top or is it ok at the top
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Old 10-02-2006, 11:37 PM   #19
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Quote:
Originally Posted by gojo83
when you say that the longer runners make more low end power does that mean you lose a lot up top or is it ok at the top
Yes, you will loose some up top hp but how much is hard to determine.
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Old 10-03-2006, 02:26 AM   #20
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Gojo, it'* generally a trade-off. Either you focus on low end, or focus on high end. It'd be nice to have the best of both worlds, but realistically an engine will always be optimized for a certain range in the powerband.
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