I just use my stock belt?
*Technical application for pulley size is a balance between low RPM torque and upper RPM horsepower. With decreasing blower pulley size, the blower spins faster for a given engine speed. Dyno tests will show that increasing the blower speed to engine speed ratio (i.e. using a smaller blower pulley) will effectively shift the power band of the engine toward the lower RPM. Lower RPM torque will increase but upper RPM horsepower will ultimately suffer due to the intense heat generated by the relatively low adiabatic efficiency of the roots type blower. If you DO NOT plan to make any other performance modifications to avoid the detonation caused by a higher temperature intake charge, we recommend you stick with the 3.4" pulley.
*THE SOLUTION? If you
want to install a 3.25 or smaller pulley, cool it back
down and get maximum throttle response with the THRASHER
Cold Air Intake Kit and colder
sparkplugs (2 heat ranges colder). With these FWD vehicles
being traction limited (they'll light the tires at ease as you
racers well know!) the pulley must be correctly sized to balance
the low speed torque and upper RPM horsepower. THRASHER also highly
recommends either headers, ported and polished exhaust manifolds,
or THRASHER Intercooler.
100% virgin steel THRASHER pulley is polished &
How will it feel?
Hey, don't just take our word for it! You
must experience this for yourself! Throttle response is much
improved even with the stock factory torque converter and final
drive ratio. Torque increases are evident at all RPM ranges
and throttle positions - even light throttle applications are
noticeably quicker. Given max stock boost levels of approximately
8 psi at the shift points, this pulley will give approximately
a 40% increase to 11+ psi. Of course,
maximum boost levels will vary somewhat due to air density,
temperature and rpm.
Why Should You Choose THRASHER?
Shown above is an early production unit
from 1997. It's turned on a CNC lathe from a solid steel billet
and was gold iridated for corrosion protection. It was
determined that increasing boost significantly beyond 11 psi
on this Eaton M90 blower was detrimental to performance without