Originally Posted by SciFion
Does anybody have an idea of what kind of horsepower gains can be expected after installing one of these headers, a CAI, and a performance exhaust? I'm guessing around 10-15 percent of stock output.
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I read about a company that made an intake manifold and header for the xD to test it out, and were able to produce 148hp on a dyno with a CAI, Magnaflow exhaust, Header and intake manifold. So more like 20hp for a CAI, header and exhaust...
---------- Post added at 01:01 PM ---------- Previous post was at 12:58 PM ----------
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Originally Posted by Richard Holdener
Here are the dyno results of the new long-tube header for the 1.8L Yaris TS and Scion xD (possibly other apps as well).
Equipped with just a home-made air intake, the otherwise stock Xd produced 123 wheel hp and 121 ft-lb of torque.
Equipped with the long-tube headers and 2.5-inch mid pipe (2.25 would work equally well) and no axle back, the motor produced 134 wheel hp and 134 ft-lb of torque.
At just 3000 rpm, the header and mid pipe offered an additional 15 ft-lb of torque.
Next we installed the prototype of the Xd intake manifold. The peak power numbers jumped to 148 hp and 137 ft-lb of torque.
At 6000 rpm, the intake offered gains of 16 hp.
It appears from this testing that if we add an NST u-pulley and receive the same results as we did on the 1.5L Yaris motor, the 1.8L can produce a real 150 wheel hp (possibly more if it reponds favorably to the FIC).
BTW-We already made 151 wheel hp with a version of the intake that won't be offered for sale-it adds a bit more peak power but sacrafices too much elsewhere)
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^^there is the original text
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