RPi dynodynamics dyno shows no significant gains from the
pulleys. From my understanding they've run many cars and
the results are always the same. I'm not sure if it's because
of the type of dyno or what. A dynojet seems to show gains.
Dynojets are notorious for showing much higher readings that
dyno dynamics/mustag dynos. Here is some dynojet numbers
which measure hp/tq differently:
Evosport Pulley Installed & Dyno'd.....
Be careful how you read this as the first dyno shows stock vs.
pulley, exhaust, charcoal filters. The final results show something
like a 16hp/18tq. Also see that there was NEVER a before
dyno run on the same day so the numbers can be very misleading.
If someone could do a before/after pulley only dyno and post the
results that would be great.