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Red is over design speed with the stock crank pulley. Both the 88 an 84 are over I have a 84mm pulley and ran it on a 1.0 install with
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08-03-2014, 12:08 PM
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#16 (permalink) |
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 Red is over design speed with the stock crank pulley. Both the 88 an 84 are over I have a 84mm pulley and ran it on a 1.0 install with no issues. Just waiting to put it on my 1.5 setup.
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08-03-2014, 04:34 PM
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#17 (permalink) |
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Interesting, so even the 88 is techically smaller than this setup should allow? I think it's the most popular pulley size though and I've never heard of a blower go out from over spinning. Thanks for that info though, cool to know how fast I'm actually spinning it
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08-04-2014, 04:43 AM
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#18 (permalink) |
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A True Z Fanatic
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from rotrex's website the c38 has a 1:7.5 gear ratio with a max impeller speed of 90,000 now we need an accurate measurement of the O.E. pulley.
Edit: also due to the high speed nature of centrifugal superchargers the manufacturers redline is usually set a little lower than it's designed redline to CTA for warranty reasons.
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08-04-2014, 01:00 PM
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#19 (permalink) |
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A True Z Fanatic
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the factory crank pulley is 146mm
SO an 88mm pulley would be 146/88 x 7500 x 7.5 = 93324rpm
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08-09-2014, 11:53 PM
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#20 (permalink) |
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^ So I (and everyone who runs an 88mm) am over spinning the blower by about 3k rpms? Doesn't seem to be a big deal though, you're right it can probably take a little more with no problems they just want you to stay conservative
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08-10-2014, 09:35 AM
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#21 (permalink) | |
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Quote:
You are only overspeed when you are turning the engine near redline. If you want to be safe, reset your max RPM to 7K with Up-Rev.
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