Going to a smaller pulley, any concerns?
08-02-2010, 01:07 PM
#1
Safety Car
Thread Starter
Going to a smaller pulley, any concerns?
I'm going to go from a 3.85 to a 3.25 inch pulley. Is there anything I should be concerned about as far as the supercharger system goes?
I am having a new dyno tune right after the change over.
I am having a new dyno tune right after the change over.
08-02-2010, 01:38 PM
#2
Instructor
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08-02-2010, 05:01 PM
#9
Race Director
08-02-2010, 08:15 PM
#14
Melting Slicks
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I think your going to overspeed the impeller with a 3.25 pulley, I'm not home so I don't have the max speed in front of me but I think it's around 60,000 rpm.
08-02-2010, 08:33 PM
#15
Burning Brakes
08-02-2010, 09:00 PM
#16
Safety Car
Thread Starter
Sounds like I shouldn't go that small right?
08-02-2010, 09:29 PM
#17
Race Director
Should be right over 62k with a 6800 rpm redline.
08-02-2010, 09:34 PM
#18
Safety Car
Thread Starter
This car is a daily driver. Don't get into boost much but sometimes on the highway.
Won't be pushing 6800 rpm, limit the dyno tune to 6500 and that would be my biggest risk?
Daily driver, some track days. No regular WOT time, no drag strip.
Am I safe?
08-02-2010, 09:43 PM
#19
Race Director
To be honest, I would still worry about some belt slip. 3.25 is very small for a procharger as their internal gearing is more aggressive than other manufacturers. If you wanted max spin with minimal risk of slippage I would get the Innovators West overdrive crank (8") and then you could use a 3.6 on the blower. That would get you more wrap on both pulleys and you would have darn near the same blower rpms as the stock+3.25 setup would give you.
08-03-2010, 07:40 AM
#20
Safety Car
Thread Starter
To be honest, I would still worry about some belt slip. 3.25 is very small for a procharger as their internal gearing is more aggressive than other manufacturers. If you wanted max spin with minimal risk of slippage I would get the Innovators West overdrive crank (8") and then you could use a 3.6 on the blower. That would get you more wrap on both pulleys and you would have darn near the same blower rpms as the stock+3.25 setup would give you.
I already have a 10% overdrive crank, came with the A&A 8 rib kit.
The car makes about 700rwhp as it is and it is a very reliable system this way too. I'm thinking of not going with a smaller pulley, at least not down to 3.25.