marc wrote:

The West Penn RX-7 Club had its first sporadic dyno day last Saturday.  You
can check www.rx-7.org/events/dynoday2000.htm for pix, and hopefully graphs
as soon as the download process is completed.

Here are a few results/finding for comparison:

IC Upgrade:

I took 2 runs to establish a baseline, and then replaced my stock IC with a
PFS unit (about two hours between runs - 2:00-4:00, so conditions were near
identical).  All other settings (manual boost valve) remained the same.  The
dyno had a fairly sizeable fan, the output of which was nearly identical to
the size/shape of the IC ducting, and placed right up to the duct.  I would
estimate it simulated the flow at 40-50 mph.

Other mods:  N-tech intake, 3" SS dp, PFS cat-back, Pettit ECU upgrade (see
next post), Unorthodox main underdrive pulley, 11lb flywheel:

Stock IC - 10.8 psi - 283.9 hp  247.7 ft-lbs
PFS IC -  11.2 psi  - 299.3 hp  264.9 ft-lbs

(Yes, I know the boost gauge isn't accurate to 0.1 lbs, but they are my best
estimates from the passenger seat and the relative difference should be
within .1-.2)

So, the PFS has about .4psi less pressure drop than stock, and is good for
about 15 hp/17 ft-lbs.

I then retested at a slightly higher boost setting:

PFS IC -  12.4 psi  - 317.4 hp  274.8 ft-lbs

So, it looks like boost is worth 15hp/psi at this level.

Rich
'93 R1

Marc Wiese, 76 RG

 
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