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Crawford Z Performance Cast Plenum Polished
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Reviews
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Date product posted
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0
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4726
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Wed December 6, 2006
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Description:
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Anyone should know one of the largest contributors to performance loss, is the starvation of air to the engine. While the majority of people would never notice such a loss, we began looking for causes of the sharp decrease in power within the upper part of the powerband.
There was our problem! That attractively molded plenum tucked under a plastic cover.
We still don't know why such an aggressive angle was incorporated into the design, perhaps to fit under the hood? Regardless, after flowbench testing we found a 30% difference in flow between the rear cylinders and the front due to the dip at the front of the plenum which allows for the oem strut bar to fit.
In taking the current design, and raising the forward portion by nearly one inch... we reduced that difference to less than 5%. This was a HUGE discovery and one that has proven itself already on the dynos, and in the hands of MANY Z owners.
On average the VQ with our plenum is making 9 hp at the original peak, and a solid 17-20 at redline.
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Polished Plenum Crawford |
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myGFRENZY Advisor
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Posts: 1,560
Registered: September 2006
Location: GA
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