Over spinning a D1?
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From: Scottsdale, AZ
Over spinning a D1? I did a search and didn't find exactly what I'm looking for on the D1 and over spinning it.
I have a 8.5" crank with a 4" blower pulley and I want to go to a 3.4" as the 4" only makes 12# in cold air. In the summer it barley passes 10#s. If I throw a 3.4" in there is my blower going to explode or what?
What's the math on my blower RPM to what it's rated?
I have a 8.5" crank with a 4" blower pulley and I want to go to a 3.4" as the 4" only makes 12# in cold air. In the summer it barley passes 10#s. If I throw a 3.4" in there is my blower going to explode or what?
What's the math on my blower RPM to what it's rated?
62K is max on a D1SC. it most likely wont explode at 64K but the higher you turn it the better chance of something failing and its just going to get to the point where it will make more heat then boost.
its crank pulley diameter/blower pulley diameter * step up (4.1 for a D1SC) * engine rpm.
its crank pulley diameter/blower pulley diameter * step up (4.1 for a D1SC) * engine rpm.
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From: Scottsdale, AZ
Originally Posted by kp
62K is max on a D1SC. it most likely wont explode at 64K but the higher you turn it the better chance of something failing and its just going to get to the point where it will make more heat then boost.
its crank pulley diameter/blower pulley diameter * step up (4.1 for a D1SC) * engine rpm.
its crank pulley diameter/blower pulley diameter * step up (4.1 for a D1SC) * engine rpm.
And if I slap the 3.4" on there I'll get 69,000rpm which is 7K to much. But if I go with the 3.8" I'll get 62,000rpm, a much better result!
I think I'll go 3.8 and call it a day. Right?
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From: Scottsdale, AZ
Originally Posted by Jake@EPP
Like others said, it wont blow up, it will make more heat and your IAT will yank timing.
My above math was based on 6,800 where my limiter is set. Since I shift close to that I think I'll go 3.6" and a 110 octane tune. I'll post the results in a new thread in a week or so.
Thanks a ton for the formulas!
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From: Scottsdale, AZ
Originally Posted by ls1290
I do not think there is be much benefit for spinning it that high. The extra air flow will be offset by the much high IAT temps and timing removal.
Keith
Keith
I won't over spin by 7K, but I'll let everyone know how the extra 2K is being taken.
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Thread Starter
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From: Scottsdale, AZ
Originally Posted by mdhmi
Is there a certain turbo car you are afraid to lose to? 
There is however a Ford GT here that's running a 3.2 whipple with meth that put down 750rwhp on a mustang dyno that I want to kill. Since his gearing is perfect for such a torque monster of a blower I'm going to put my rig on kill just because I can.
If he tries to up it any more I'll throw a 100 shot on.
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From: Scottsdale, AZ
Originally Posted by NicD
Drew, use nitrous in addition to the smaller pulley and race gas. No more problem. 
