Anyone remember % Ok to Overspin Blower?
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From: Centrifugal City
Anyone remember % Ok to Overspin Blower? What is the rule of thumb with overspinning blowers past their stated redline?
I believe 5-10% was ok last time I talked to Vortech. They noted that all SC's have belt slippage, so even at 5-10% over on paper you are not achieving those blower RPM's due to minor slippage.
Any thoughts?
Am considering going 4-7% over my T-Trim Redline (55k).
TIA.
P.S. FWIW, my S-Trim made peak power at 4-5% past Redline (50k).
I believe 5-10% was ok last time I talked to Vortech. They noted that all SC's have belt slippage, so even at 5-10% over on paper you are not achieving those blower RPM's due to minor slippage.
Any thoughts?
Am considering going 4-7% over my T-Trim Redline (55k).
TIA.
P.S. FWIW, my S-Trim made peak power at 4-5% past Redline (50k).
Last edited by MelloYellow; Jan 8, 2005 at 03:48 PM.
on the old s-trim, we were truning it to 54K rpms and never had a problem for a couple of years it was on there. this new YSi trim we are going to turn to 58K rpms ( but it is rated to 62). i personally wouldnt overspin a blower more than 5-7K over its max.
i also agree that most people dont account for the 10% slipage at top rpm if using an 8 rib.
i also agree that most people dont account for the 10% slipage at top rpm if using an 8 rib.
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From: Centrifugal City
It's the belt setup for the C5 Vortech kits.
Primary drive is a 6-Rib serpentine. There is a 3.60" SC Jackshaft pulley on the 6-Rib serpentine. There is a jackshaft that goes thru the Vortech SC bracket. On the rear is a 32 Cog Pulley attached to the same jackshaft the 3.60" 6-Rib is on. The Supercharger itself has a 28 Cog pulley. Cog belt between the 32 and 28.
If something is going to slip it will be the primary 3.60" 6-Rib in our setup.
Primary drive is a 6-Rib serpentine. There is a 3.60" SC Jackshaft pulley on the 6-Rib serpentine. There is a jackshaft that goes thru the Vortech SC bracket. On the rear is a 32 Cog Pulley attached to the same jackshaft the 3.60" 6-Rib is on. The Supercharger itself has a 28 Cog pulley. Cog belt between the 32 and 28.
If something is going to slip it will be the primary 3.60" 6-Rib in our setup.
Last edited by MelloYellow; Jan 10, 2005 at 02:13 PM.
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Thread Starter
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From: Centrifugal City
Not my car, but here are some pics:
1st Pic = Belt wrap around 3.60" 6-Rib w/loose cog belt in background.
2nd Pic shows Cog Side view.
1st Pic = Belt wrap around 3.60" 6-Rib w/loose cog belt in background.
2nd Pic shows Cog Side view.
Last edited by MelloYellow; Jan 10, 2005 at 02:14 PM.
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crank divided by blower pulley size X the step up ratio of the blower X the max RPM you shift at.
like my old setup
7.25" crank pulley divided by my 3.4" blower pulley= 2.132
2.132 X 4.1 steup of the blowers internal ratio= 8.742
8.742 X 6600 RPM shift point= 57,701 RPM's
Kyle
like my old setup
7.25" crank pulley divided by my 3.4" blower pulley= 2.132
2.132 X 4.1 steup of the blowers internal ratio= 8.742
8.742 X 6600 RPM shift point= 57,701 RPM's
Kyle
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From: Centrifugal City
Calculator for a C5 Vortech setup is here:
http://www.vortechsuperchargers.com/...edv-2jack.html
http://www.vortechsuperchargers.com/...edv-2jack.html
Last edited by MelloYellow; Jan 15, 2005 at 03:59 PM.
Im wanting to try a smaller pulley on my S trim. Right now Im shifting at 5800 and seeing almost exactly 50K. Id like to go to a 2.95 pulley and spin to 6200, at that point Id be seeing 56,7XX not factoring in slip.
Originally Posted by MelloYellow
You'll make a bit more power and also shift your powerband down a little maybe.
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From: Centrifugal City
I believe Vortech said it was ok to go up to 10% over due to belt slippage, but you could call. I know they shipped S-Trim pulleys to me that spun the blower to 56k as the highest they made/supported even tho that carried no warranty. Past that the didn't really advise spinning much more.
I made max S-Trim power at 52500rpm. Power started falling off fast at 55000rpm, I believe due to heat and inefficiency. Max efficiency is at 45000rpm I think. Not factoring in belt slip.
I made max S-Trim power at 52500rpm. Power started falling off fast at 55000rpm, I believe due to heat and inefficiency. Max efficiency is at 45000rpm I think. Not factoring in belt slip.
Last edited by MelloYellow; Jan 15, 2005 at 04:00 PM.
Originally Posted by MelloYellow
I believe Vortech said it was ok to go up to 10k over due to belt slippage, but you could call. I know they shipped S-Trim pulleys to me that spun the blower to 56k as the highest they made/supported even tho that carried no warranty. Past that the didn't really advise spinning much more.
I made max S-Trim power at 52500rpm. Power started falling off fast at 55000rpm, I believe due to heat and inefficiency. Max efficiency is at 45000rpm I think. Not factoring in belt slip.
I made max S-Trim power at 52500rpm. Power started falling off fast at 55000rpm, I believe due to heat and inefficiency. Max efficiency is at 45000rpm I think. Not factoring in belt slip.
One more..... I seem to remember someone saying that the upgrade to the T trim hybrid was $900. Does that seem about right? Thanks alot.
the trading in never seems to add up. esp for what you can sell your head unit on line. as for overspining, i think it is ok to overspin by 10% as long as you 1) account for overspin 2) it depends if it is not a daily driver. if you put 10 thousand miles + on your blower a year, then it is going to adversely affect your blower as compared to the weekend warrior.
Originally Posted by gator's 99TA
the trading in never seems to add up. esp for what you can sell your head unit on line.
Originally Posted by gator's 99TA
as for overspining, i think it is ok to overspin by 10% as long as you 1) account for overspin 2) it depends if it is not a daily driver. if you put 10 thousand miles + on your blower a year, then it is going to adversely affect your blower as compared to the weekend warrior.