ScienceofSpeed manufactures "high boost" pulleys for the Comptech Novi
1000 Supercharger kit for the S2000. These billet aluminum machined
pulleys are smaller than the standard Comptech design causing the
supercharger to spin faster increase boost and power levels.
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 4.0 - 3.2" in 0.2" increments.
We keep the most popular sizes in stock at all times so there are no
production delays to get your project on the road. |
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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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pulley size |
part |
approximate peak
wheel horsepower (with recommended modifications) |
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4.4" |
Comptech supplied
size for 2.0L |
305 whp |
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4.2" |
Comptech supplied size for 2.2L |
310 whp |
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4.0" |
ScienceofSpeed
enpp-1091.400 |
325 whp |
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3.8" |
ScienceofSpeed
enpp-1091.380 |
340 whp |
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3.6" |
ScienceofSpeed
enpp-1091.360 |
350 whp |
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3.4" |
ScienceofSpeed
enpp-1091.340 |
360 whp |
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3.2" |
ScienceofSpeed
enpp-1091.320 |
370 whp |
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We do not list our pulleys by "pressure" since this varies
significantly by a variety of factors including RPM, engine displacement
(2.0L AP1 vs 2.2L AP2), factory or modified compression, air density,
etc.
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
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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 (although this is highly variable
based on method of lowering compression ratio
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However,
this again varies by a number of factors including compressor
efficiency and the following should only be used as a general guide. |
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pulley size |
AP1 2.0L approximate
boost range at max RPM (9000) |
AP2 2.2L approximate
boost range at max RPM (8000) |
| 4.4" |
5.7 PSI |
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| 4.2" |
7.0 PSI |
5.5 PSI |
| 4.0" |
8.0 PSI |
7.0 PSI |
| 3.8" |
9.0 PSI |
8.5 PSI |
| 3.6" |
10.0 PSI |
10.0 PSI |
| 3.4" |
11.0 PSI |
11.5 PSI |
| 3.2" |
12.0 PSI |
12.8 PSI |
| Testing completed at
1000 ft ASL, approx 100 deg F, 25% humidity. Estimated pressures all
listed at standard 11:1 compression for comparison. Lower
compression recommended for pulleys smaller than 3.8" size. |
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Please note that supporting fuel system
and engine modifications are required to be used with these higher
performance pulleys.
For recommended upgrade stages,
please see this page.
A thicker head gasket will reduce
compression - increasing the durability of the engine with proper tuning
allowing a smaller pulley with the ability to produce more power to be
used. Replacing the head gasket can be a cost effective way to get above
350 hp.
We recommend a properly prepared short block with forged low
compression pistons for any power level above 380 wheel horsepower. As
always, the tuning is the most crucial aspect to reliability and these
details should be discussed with your tuner.
The aftercooler option from Comptech is recommended for use with higher
boost pulleys. |
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pulley size |
recommended
modifications |
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4.0" |
engine management,
injectors |
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3.8" |
engine management,
injectors |
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3.6" |
engine management,
injectors, lower compression head gasket |
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3.4" |
engine management,
injectors, lower compression head gasket |
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3.2" |
engine management,
injectors, lower compression head gasket or prepared bottom end
(sleeved block, forged low compression pistons) |
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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. |
![2406_3_L[1].jpg (44859 bytes)](/products/exhaust_airflow_products/S2000/PasswordJDM/air_induction_system/2406_3_L[1]_small.jpg)
S2000, all yrs
