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HOW DOES
RUNNER LENGTH AFFECT POWER?
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Before & After >
Windstar
Intake
vs Intake Spacer
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Windstar Intake vs Intake Spacer
Here is a price comparison and my posted gains for the two
products.
99-04 Intake Spacer Kit 7ft/tq 5hp $ 115.00
99-04 Windstar Intake Kit 15ft/tq 7hp $ 300.00
Ok, so now I am going to try and explain why a comparison like this
is completely incorrect. Stay with me here.
Here is an excerpt from the intake spacer dyno thread:
"The dynos consistently showed up to an extra 6-7rwtq and up
to 8rwhp. The gains were primarily in the lower rpm's though.
Overall, peak performance (the highest number on the dyno) only went
up by about 2rwtq and 3rwhp. Remember though, peak power typically
occurs high in the rpm's. As was just stated, this mod is best for
low-end power."
When Ford or any other car manufacture
tests their engines they post up the "peak" performance gains. The
Windstar is rated at 200HP, 240TQ. The 99-00 Mustang makes 190HP,
220TQ and the 01-04 Mustang makes 193HP and 225TQ. The Windstar and
Mustang both have an identical engine setup except for the Intake
manifold. This gives the Windstar a 10HP, 20TQ lead on a 99-00 and a
7HP, 15TQ lead on the 01-04 Mustangs. But now remember this is
"peak" power output which occurs at high RPM's. As you see above,
the spacers provide a really nice power gain down low, (longer
runners give power to lower RPMs) but the "peak" gain was
lower, at 2TQ,
3HP. The Windstar will provide more of a steady ~15TQ gain
throughout the entire RPM band, where as the spacer would give
a 7TQ
gain located more in the lower RPM's.
Our splitport engines have two runners per cylinder; short runners
for high RPM, long runners for low RPM. The
more efficient Windstar has longer "long" runners and shorter
"short" runners. Where as a spacer can only lengthen the runners,
which gives you more low end power - but you can only go so far
before the top end gains diminish.
The only way to visually see what I am saying would be in a dyno
graph and see the area under the curve. I am hoping to get Stock vs
Spacer vs Windstar dyno done this summer.
- Steven
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