Overspinning Your Centrifugal Blower??
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Overspinning Your Centrifugal Blower?? How many here have had problems with their head units due to overspinning? I have Vortech SQ S-Trim that is rated for 50K rpms, but I overspin to 52K rpms before shifting from 1st to 2nd gear, and again to 52K from 2nd to 3rd gear. This is only a very brief period, a second or less while I am accelerating so I am not "overspinning" for extended periods. Does anybody have any stories of head unit failure due to overspinning?...I would be interested to know because I am contemplating going from a 3.4" head pulley with a 6 Rib setup, to a 3.6" head pulley with an 8 Rib setup with 8" balancer pulley while shifting at the same rpm(6800-6850). This would only increase my impeller speed by about 500 rpms. I am switching to the eight rib setup to eliminate some occassional belt slip which I know will eventually eat my belt at the worst time. Thanks in advance 
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From: Norn Iron
How exactly would you attribute failure to overspinning ?
I overspin my YSi, and yes, one of the bearings did fail recently. I doubt it was due to overspinning though.
I recently read of a guy in Sweden with a BMW M3 and a YSi, making a,little over 1000bhp, spinning his to 71,000rpm, cog drive.
Which is like 6,000rpm over what is reccomended.
So far he's ok too.
I overspin my YSi, and yes, one of the bearings did fail recently. I doubt it was due to overspinning though.
I recently read of a guy in Sweden with a BMW M3 and a YSi, making a,little over 1000bhp, spinning his to 71,000rpm, cog drive.
Which is like 6,000rpm over what is reccomended.
So far he's ok too.
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Originally Posted by stevieturbo
How exactly would you attribute failure to overspinning ?
I overspin my YSi, and yes, one of the bearings did fail recently. I doubt it was due to overspinning though.
I recently read of a guy in Sweden with a BMW M3 and a YSi, making a,little over 1000bhp, spinning his to 71,000rpm, cog drive.
Which is like 6,000rpm over what is reccomended.
So far he's ok too.
I overspin my YSi, and yes, one of the bearings did fail recently. I doubt it was due to overspinning though.
I recently read of a guy in Sweden with a BMW M3 and a YSi, making a,little over 1000bhp, spinning his to 71,000rpm, cog drive.
Which is like 6,000rpm over what is reccomended.
So far he's ok too.
I was told by a Vortech technician that you lose efficiency and reliability, which I feel is a "canned" or at least expected answer. I know the head units have a "sweet spot" and anything above that results in diminishing returns: input vs. output. My main concern is if I overspin by 5-7k will the impeller "frag" and destroy the head unit. I plan on squeezing every last hp out of my little S-Trim before upgrading just to see how much power can be had from optimizing my setup. When it is time to upgrade, I'm not sure whether I will go YSI or Paxton Novi 2000. Andy at A&A said his YSI is very quiet, would you characterize your YSI as quiet?
Scotty-when you decide to upgrade don't even bother considering the Novi2000, the Ysi is a much better blower-unless of course you want an even better blower than you could slap in a Procharger. Sorry just had to add that. I think what happens with overspinning the blower is getting out of it's efficiency range and then robbing your motor horsepower to spin the blower.
Originally Posted by eb02z06
Scotty-when you decide to upgrade don't even bother considering the Novi2000, the Ysi is a much better blower-unless of course you want an even better blower than you could slap in a Procharger. Sorry just had to add that. I think what happens with overspinning the blower is getting out of it's efficiency range and then robbing your motor horsepower to spin the blower.
This is exactly what happens just heats the air more and you loose efficiency with the hotter air and as far as the mechanical aspect yes they can fly apart at a certain point, but I don't think you are any where near it just yet I over spun the G-trim a long time just like what you are describing at the top of the gears it was a couple grand, but no issues with blower just hotter air I used the meth to combat that at the time etc... ebo2zo6 and I have already talked about this same what blower deal in another thread and I agreed you could make more with an F1, but I believe a YSI and a D-1 are Very comparable in HP capabilities just preference is yours both are reliable units I do believe you will find a used D-1 cheaper and easier than you can a YSI although that means new brackets etc... Good luck I have been meaning to call you just been busy with work and moving etc..
Jeff
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Originally Posted by eb02z06
Scotty-when you decide to upgrade don't even bother considering the Novi2000, the Ysi is a much better blower-unless of course you want an even better blower than you could slap in a Procharger. Sorry just had to add that. I think what happens with overspinning the blower is getting out of it's efficiency range and then robbing your motor horsepower to spin the blower.
Thanks for chiming in Arun. Is the Ysi as loud as the D1SC ?...I know the F1R sounds like a 747
Sorry had to add that too 
IMHO Prochargers are great units and one would be in my car now if it weren't for the availability issues when I first purchased my kit from A&A. Procharger could not supply me one either as I believe they were holding out for the release of their upgraded C5 kit. I'm just looking for something quieter, if possible, when I do upgrade the head unit. BTW, has your new setup seen the track? Trending Topics
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Originally Posted by Inspector12
Scotty,
This is exactly what happens just heats the air more and you loose efficiency with the hotter air and as far as the mechanical aspect yes they can fly apart at a certain point, but I don't think you are any where near it just yet I over spun the G-trim a long time just like what you are describing at the top of the gears it was a couple grand, but no issues with blower just hotter air I used the meth to combat that at the time etc... ebo2zo6 and I have already talked about this same what blower deal in another thread and I agreed you could make more with an F1, but I believe a YSI and a D-1 are Very comparable in HP capabilities just preference is yours both are reliable units I do believe you will find a used D-1 cheaper and easier than you can a YSI although that means new brackets etc... Good luck I have been meaning to call you just been busy with work and moving etc..
Jeff
This is exactly what happens just heats the air more and you loose efficiency with the hotter air and as far as the mechanical aspect yes they can fly apart at a certain point, but I don't think you are any where near it just yet I over spun the G-trim a long time just like what you are describing at the top of the gears it was a couple grand, but no issues with blower just hotter air I used the meth to combat that at the time etc... ebo2zo6 and I have already talked about this same what blower deal in another thread and I agreed you could make more with an F1, but I believe a YSI and a D-1 are Very comparable in HP capabilities just preference is yours both are reliable units I do believe you will find a used D-1 cheaper and easier than you can a YSI although that means new brackets etc... Good luck I have been meaning to call you just been busy with work and moving etc..
Jeff
Sound advice Bro. Good to hear your out there and doing well. I've been having my house remodelled, what a F*ckin Money Pit!!!
Give me a call if you don't hear from me first, Later Bro LS1 Tech Stories
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Originally Posted by NemesisC5
Thanks for chiming in Arun. Is the Ysi as loud as the D1SC ?...I know the F1R sounds like a 747 Sorry had to add that too IMHO Prochargers are great units and one would be in my car now if it weren't for the availability issues when I first purchased my kit from A&A. Procharger could not supply me one either as I believe they were holding out for the release of their upgraded C5 kit. I'm just looking for something quieter, if possible, when I do upgrade the head unit. BTW, has your new setup seen the track?
Sorry had to add that too IMHO Prochargers are great units and one would be in my car now if it weren't for the availability issues when I first purchased my kit from A&A. Procharger could not supply me one either as I believe they were holding out for the release of their upgraded C5 kit. I'm just looking for something quieter, if possible, when I do upgrade the head unit. BTW, has your new setup seen the track? I'll be hitting the dyno some time this week with the D1SC and then off to the track this coming weekend-FINALLY!!!!!!
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Originally Posted by eb02z06
I'm pretty sure the YSi will be louder than the D1SC but who know's-i have a D1SC on my car right now and to me it's pretty quiet compared to my F1R. The YSi will be louder than the S-trim because it only comes in straight cut gears-but man that YSi will be make some power. There was a guys selling a T-trim on the CF forum for dirt cheap-like $1200-that would be an easy 50-75 horse over the S-trim. I kind of like the noise and I'm missing my F1R-but that D1 is pretty potent too. I finally got a free weekend so I got my Wolfe Rollcage installed, my fuels system sorted out and hooked up a 3 bar map so i can log boost.
I'll be hitting the dyno some time this week with the D1SC and then off to the track this coming weekend-FINALLY!!!!!!
I'll be hitting the dyno some time this week with the D1SC and then off to the track this coming weekend-FINALLY!!!!!!
Originally Posted by eb02z06
I'm pretty sure the YSi will be louder than the D1SC but who know's-i have a D1SC on my car right now and to me it's pretty quiet compared to my F1R. The YSi will be louder than the S-trim because it only comes in straight cut gears-but man that YSi will be make some power. There was a guys selling a T-trim on the CF forum for dirt cheap-like $1200-that would be an easy 50-75 horse over the S-trim. I kind of like the noise and I'm missing my F1R-but that D1 is pretty potent too. I finally got a free weekend so I got my Wolfe Rollcage installed, my fuels system sorted out and hooked up a 3 bar map so i can log boost.
I'll be hitting the dyno some time this week with the D1SC and then off to the track this coming weekend-FINALLY!!!!!!
I'll be hitting the dyno some time this week with the D1SC and then off to the track this coming weekend-FINALLY!!!!!!
Can't wait for the dyno numbers.
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From: Norn Iron
I wouldnt characterise my YSi as quite....but I wouldnt say its terribly loud either.
It is quite audible over the engine though, although in-car its not bad at all.
Im overspinning, because they wont make me a bigger supercharger to fit in the same space
Is it efficient ?? havent a clue, they wont release a compressor map for it. So I'll just keep spinning it.
All these guys making new wheels for the turbos....why not the blowers !!!!
It is quite audible over the engine though, although in-car its not bad at all.
Im overspinning, because they wont make me a bigger supercharger to fit in the same space
Is it efficient ?? havent a clue, they wont release a compressor map for it. So I'll just keep spinning it.
All these guys making new wheels for the turbos....why not the blowers !!!!
