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blower speed-RPM calculator formula?

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Old Feb 27, 2008 | 12:44 AM
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Default blower speed-RPM calculator formula?
I need the formula to figer out what my blower speed will be,
does anyone know the math, i used to have it.
thank you for your help
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Old Feb 27, 2008 | 07:42 AM
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Procharger I assume?

edit: never mind, I just saw your other thread.
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Old Feb 27, 2008 | 08:02 AM
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engine RPM x pulley ratio x blower step up ratio
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Old Feb 27, 2008 | 08:07 AM
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Here ya go..

Just enter your application pulley sizes / gear ratio / and engine RPM.
Attached Files
Last edited by b727pic; Feb 4, 2011 at 12:00 PM. Reason: Typo's fixed
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Old Feb 27, 2008 | 10:06 AM
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Originally Posted by b727pic
Here ya go..

Just enter your application pulley sizes / gear ratio / and engine RPM.
That calculater is awesome! Makes it super easy to figure out. Thanks. I still have a lot left in my little D1, should work just fine with my new 408 set-up.
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Old Feb 27, 2008 | 10:37 AM
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I believe the D1 kit comes with a 7.25 crank pulley and 4.5" blower pulley which is suppose to be about 8psi. Can anyone verify that?

If so I'm at 42936rpm and its making about 10psi on a stock LS1 and I've still got another 19000 to go
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Old Feb 27, 2008 | 11:02 AM
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Originally Posted by rufretic
That calculater is awesome! Makes it super easy to figure out. Thanks. I still have a lot left in my little D1, should work just fine with my new 408 set-up.

Happy to be of service
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Old Feb 27, 2008 | 11:05 AM
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Originally Posted by No Juice
I believe the D1 kit comes with a 7.25 crank pulley and 4.5" blower pulley which is suppose to be about 8psi. Can anyone verify that?

If so I'm at 42936rpm and its making about 10psi on a stock LS1 and I've still got another 19000 to go

Not sure about the F body, but the GTO was a 7" crank pulley. I had a custom 8" pulley made by ASP to get my RPM's up on the impeller yet still keep enough belt wrap on the blower pulley to keep belt slip to a minimum.
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Old Feb 27, 2008 | 11:46 AM
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SDCE uses a 7.25" crank pulley. The ATI 8 rib crank pulley is 7.65"
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Old Feb 27, 2008 | 11:46 AM
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Hi b727pic
thank you for your help but i cant open the file, can u send me the link to the procharger calculator, i cant find it either on there sight

thank you very much
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Old Feb 27, 2008 | 12:21 PM
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Originally Posted by Lawnboy
Hi b727pic
thank you for your help but i cant open the file, can u send me the link to the procharger calculator, i cant find it either on there sight

thank you very much

responded to your PM.

If you dont have Excel you can't open it.

If you do have excel not sure why it wont open??? I can always email you the calc, but you will need MS Excel or excel reader...
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Old Feb 27, 2008 | 03:38 PM
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maybe he doesnt have winzip?
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Old Feb 27, 2008 | 04:22 PM
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Originally Posted by ChevyChad
maybe he doesnt have winzip?
Could be...

If anyone needs this, simply shoot me a PM, I can email it to you.....
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Old Feb 27, 2008 | 04:34 PM
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although it really is not hard to do the math yourself
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Old Feb 27, 2008 | 04:52 PM
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Originally Posted by ChevyChad
SDCE uses a 7.25" crank pulley. The ATI 8 rib crank pulley is 7.65"
Wow, guess I was a little off
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Old Apr 3, 2008 | 08:32 PM
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Originally Posted by b727pic
Here ya go..

Just enter your application pulley sizes / gear ratio / and engine RPM.
Thanks for the spreadsheet. Makes it real easy!
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