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These supercharger drive pulleys are
designed for the ScienceofSpeed Paxton 1200/1220 based Supercharger
System and Comptech Supercharger Systems retrofitted with the Paxton
1200/1220 superchargers.
Proper belt engagement is crucial as a slipping belt will cause the
supercharger to not spin reducing power. In several years of installing
these supercharger systems on the S2000, we have found what design and
materials work best. Compared to other pulleys available - these pulleys
fit right on the shaft of the supercharger (no grinding or sanding required), feature a belt
guide that prevents belt movement, and feature a durable yet high
traction plating that reduces belt slip.
We manufacture these pulleys in 5.0 - 3.0" in 0.2" increments
and usually have every size in stock. |
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It is important to note that the accepted
industry practice to measure pulley diameter is at the top of the pulley
teeth. Our pulleys are measured and listed by this standard. Other
manufactures, including Comptech, do not advertise pulleys by this
standard.
ScienceofSpeed pulleys have extra flat "teeth" that aid measuring
diameter. ScienceofSpeed pulleys are engraved with diameter sizes
& part numbers to prevent confusion. |
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approximate
pressure at redline (at sea level, at stock compression)
PLEASE NOTE: These
numbers vary drastically based on air density, intake efficiency, and charge
cooler design, so they should only be used as a very rough starting
guide. Novi 1200 calculations are |
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Novi 1220 |
2.0L |
2.2L |
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Novi 1200 |
2.0L |
2.2L |
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pulley size |
9000 RPM |
8000 RPM |
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pulley size |
9000 RPM |
8000 RPM |
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5.0" |
5 |
4 |
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5.0" |
6.5 |
6 |
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4.8" |
6 |
4.5 |
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4.8" |
7 |
6.5 |
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4.6" |
7 |
5 |
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4.6" |
8 |
7 |
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4.4" |
7.5 |
6 |
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4.4" |
9 |
8 |
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4.2" |
8.5 |
7 |
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4.2" |
10 |
9 |
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4.0" |
9 |
8 |
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4.0" |
11 |
10 |
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3.8" |
10.5 |
9 |
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3.8" |
12.5 |
11.5 |
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3.6" |
11 |
10.5 |
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3.6" |
13 |
13 |
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3.4" |
11.25 |
11.25 |
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3.4" |
15.5 |
14.5 |
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3.2" |
11.5 |
11.5 |
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3.2" |
16 |
15 |
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3.0" |
n/a |
12 |
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3.0" |
n/a |
16 |
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As a very general rule of thumb, with all things being equal our testing
has shown: |
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each increase of 0.2" of pulley size
results in a pressure increase of 1 - 1.5 PSI (in the most efficient
area of the supercharger)
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each increase of 1000 RPM results in a
pressure increase of 1 PSI
- Each 1 point of compression loss
results in 1 PSI of pressure loss
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However,
this again varies by a number of factors -
including air density, intake efficiency,
and charge cooler design, so they should only be used as a very rough
starting guide. |
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standard ScienceofSpeed Supercharger
Configuration Pulleys: |
- Stage 1 2.0L: 1220 4.8" (approx 6
PSI)
- Stage 1 2.2L: 1220 4.4" (approx 6
PSI)
- Stage 2 2.0L: 1220 4.0" (approx 9
PSI)
- Stage 2 2.2L: 1220 3.8" (approx 9
PSI)
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Please note that supporting fuel system
(fuel & ignition controller / stand alone engine management, injectors,
regulator, & fuel pump) are required.
AP1 (2.0L, 9000 RPM) should not use smaller than 3.2", AP2 (2.2L, 8000
RPM) should not use smaller than 3.0". |
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Shorter drive belts are required with these smaller pulleys. We will
provide the correct pulley if you order them from ScienceofSpeed. You
must specify if the belt is for use with ScienceofSpeed or Comptech
kits.
Please note that for customers upgrading Comptech Supercharger systems,
the pulley mounting hardware from the original kit is not compatible
with the Novi 1200/1220. An optional pulley mounting hardware kit is
available below. |
S2000, all yrs