Over spining a procharger D1sc???? Help?
Thread Starter
TECH Regular
Joined: Nov 2002
Posts: 408
Likes: 0
From: Houston TX (Chicago/Evanston IL)
Over spining a procharger D1sc???? Help? It seems like I will be over spining my ATI procharger D1SC. The recomended maximum RPM for a D1SC is 62,000 rpm. My red line will be 6500 engine RPM's, at 6100 engine RPM's the Blower will be at 62,525 rpm's thats ok 6300 engine rpm's will put the blower at 64,576 rpm's and at my red line 6500 engine RPM's the blower will be spining at 66,635 RPM's thats 4625 RPM's above the rating. Its not that overspun. Will it break quick? I know I will be cutting the life of the blower, but will it hold? Are prochargers claims at 62k conservative for waranty/liability reasons?
Re: Over spining a procharger D1sc???? Help? it's not the life or longevity of the blower that determines the max. rpm. what happens at 62000 rpm is that the blower impeller approaches the the speed of sound, when that happenes a small shockwave leads the impeller blade edge. what this does is actually diminish the efficiency of the impeller and in turn the blower looses boost.
hope i made sence with all that babbling.
hope i made sence with all that babbling.
Thread Starter
TECH Regular
Joined: Nov 2002
Posts: 408
Likes: 0
From: Houston TX (Chicago/Evanston IL)
Re: Over spining a procharger D1sc???? Help? I have seend Blowers rated at 70K and above. Some turbo's are rated at over 100K? So I should be ok with the blower being over spun a little? The guys over at CamaroZ28.com said that it will break for sure. That seemed a little hard to swallow.
TECH Apprentice
Joined: May 2002
Posts: 320
Likes: 0
From: Phoenix, AZ
Re: Over spining a procharger D1sc???? Help? I'm guessing that the turbos and superchargers that you saw with ratings 70k+ were actually smaller than your D1SC. Since the impeller is smaller, the linear velocity is lower at a given rpm. Therefore, it can spin higher before it hits the speed of sound. The larger the impeller, the lower the max speed.
Trending Topics
Teching In
Joined: Aug 2003
Posts: 21
Likes: 0
From: Rochester Hills, MI
Re: Over spining a procharger D1sc???? Help?
I have seend Blowers rated at 70K and above. Some turbo's are rated at over 100K? So I should be ok with the blower being over spun a little? The guys over at CamaroZ28.com said that it will break for sure. That seemed a little hard to swallow.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Re: Over spining a procharger D1sc???? Help? Negative on the 'whiping out your blower'.
Reefing on your belt tensioner enough to get it to spin to 62,000 rpm, is how you whipe out a blower.
I have never seen a D1 whiped out from overspinning. I have seen D1's whiped out from too much tension on the belt, or misalignments which plays all kind of havoc on the blower at high RPM.
Just my .02
Reefing on your belt tensioner enough to get it to spin to 62,000 rpm, is how you whipe out a blower.
I have never seen a D1 whiped out from overspinning. I have seen D1's whiped out from too much tension on the belt, or misalignments which plays all kind of havoc on the blower at high RPM.
Just my .02
TECH Addict
Joined: Nov 2001
Posts: 2,207
Likes: 0
From: College Station, Tx
Re: Over spining a procharger D1sc???? Help? I don't know about the D1, but I know plenty of vortech setup's that are regularly overspun - is it the best thing to do? Probably not, as you would benefit from a larger blower more than likely, but it should not destroy the blower unless you are having other issues (compressor surge, etc.)
Also it's worth noting that while you want to avoid going sonic at exducer, that the speed of sound will actually increase relative to atmospheric since the air is compressed - so at higher pressure ratio's you can get away with higher impeller speeds before you run into this issue.
I would also question how you are determining red line, etc. In the end you are just going to have to throw the car on a dyno and see where it makes the best sense to shift - if you really go significantly hypersonic then you will probably see a reduction in horsepower - so it will not benefit you to spin that high anyway - so you would shift lower regardless.
Also it's worth noting that while you want to avoid going sonic at exducer, that the speed of sound will actually increase relative to atmospheric since the air is compressed - so at higher pressure ratio's you can get away with higher impeller speeds before you run into this issue.
I would also question how you are determining red line, etc. In the end you are just going to have to throw the car on a dyno and see where it makes the best sense to shift - if you really go significantly hypersonic then you will probably see a reduction in horsepower - so it will not benefit you to spin that high anyway - so you would shift lower regardless.
Re: Over spining a procharger D1sc???? Help? f2-r now thats a big daddy
i know the f1 will fit on the d1sc bracket the transmission is just a little deeper i would " assume" the f2-r would be similar
i know the f1 will fit on the d1sc bracket the transmission is just a little deeper i would " assume" the f2-r would be similar
