Procharger on Coyote?

[TrueStreetTim]

Originally Posted by blownaltered I believe the formula is. Lower pulley diameter/top pulley= X engine rpm= X step up ratio= blower rpm The max is written on your blower along with the step up ratio. Engine rpm would be where you shift at or the max rpm you want to run. Hope this helps

(Crank pulley size / Blower pulley size X step up ratio) X max rpm= impeller speed

Bold items are simply to separate the math

So how do you know if you are over spinning a blower? I bought my P1 used and it came with the smaller pulley. The shop said it was fine so I didn't worry about it.

I'm assuming a lot here as I don't have all your specs. So your roughly 630whp? I'll also assume you've got headers & full exhaust?

P1SC-1's max impeller (max efficiency) speed is 65k. It should also be a 4.1 gear (step-up) ratio. Your blower pulley roughly a 3.60? And crank pulley a 7.5.

So [I](Crank pulley size / Blower pulley size x step up ratio) x max rpm= 61.5k impeller speed @ 7,200rpm. So your around 95% the max efficiency.

To see that kind of power on a P1 I'm guessing the car is around 12-14psi. What kind of psi are you seeing?

[blownaltered]

Originally Posted by TrueStreetTim (Crank pulley size / Blower pulley size X step up ratio) X max rpm= impeller speed Bold items are simply to separate the math I'm assuming a lot here as I don't have all your specs. So your roughly 630whp? I'll also assume you've got headers & full exhaust? P1SC-1's max impeller (max efficiency) speed is 65k. It should also be a 4.1 gear (step-up) ratio. Your blower pulley roughly a 3.60? And crank pulley a 7.5. So [I](Crank pulley size / Blower pulley size x step up ratio) x max rpm= 61.5k impeller speed @ 7,200rpm. So your around 95% the max efficiency. To see that kind of power on a P1 I'm guessing the car is around 12-14psi. What kind of psi are you seeing?

Ok lower pulley is the crank but hey the math was right. I wasn't thinking when I wrote lower

Hey what's the stock crank pulley on a fox. I think it's a 6" but can't remember.

[TrueStreetTim]

Originally Posted by blownaltered Ok lower pulley is the crank but hey the math was right. I wasn't thinking when I wrote lower Hey what's the stock crank pulley on a fox. I think it's a 6" but can't remember.

To clarify; the crank pulley in this scenario is in reference to the crank...blower...pulley. In other words...the one that comes with the kit for installation. So, yes, the "lower" is still correct lol

[blownaltered]

Originally Posted by TrueStreetTim To clarify; the crank pulley in this scenario is in reference to the crank...blower...pulley. In other words...the one that comes with the kit for installation.

I know which pulley is which. Just because I didn't write it out the way you would like doesn't make it wrong. I was also typing on a phone while taking a shit so give a fucker a break.

So what is the stock size crank pulley on a fox or does a cripple have to measure when he gets home.

[TrueStreetTim]

Originally Posted by blownaltered I know which pulley is which. Just because I didn't write it out the way you would like doesn't make it wrong. I was also typing on a phone while taking a shit so give a fucker a break. So what is the stock size crank pulley on a fox or does a cripple have to measure when he gets home.

Lmao, I wasn't throwing punches. Just letting you know that you were indeed correct and can continue your shit unstressed! The "clarification" was meant for others general knowledge. Sorry to confuse.

As for the fox pulley....I'm uncertain. The others might know. I'll see what I can find out unless you beat me to it.

[blownaltered]

Originally Posted by TrueStreetTim Lmao, I wasn't throwing punches. Just letting you know that you were indeed correct and can continue your shit unstressed! The "clarification" was meant for others general knowledge. Sorry to confuse. As for the fox pulley....I'm uncertain. The others might know. I'll see what I can find out unless you beat me to it.

Lol I was just giving you shit. When I read it back after you did yours I knew it didn't make since. Yeah if you find out let me know. I think it is 6" but I can measure later if need be. I'm just trying to see where I'm at rpm wise myself.

[ProCharge5.0]

Originally Posted by TrueStreetTim (Crank pulley size / Blower pulley size X step up ratio) X max rpm= impeller speed Bold items are simply to separate the math I'm assuming a lot here as I don't have all your specs. So your roughly 630whp? I'll also assume you've got headers & full exhaust? P1SC-1's max impeller (max efficiency) speed is 65k. It should also be a 4.1 gear (step-up) ratio. Your blower pulley roughly a 3.60? And crank pulley a 7.5. So [I](Crank pulley size / Blower pulley size x step up ratio) x max rpm= 61.5k impeller speed @ 7,200rpm. So your around 95% the max efficiency. To see that kind of power on a P1 I'm guessing the car is around 12-14psi. What kind of psi are you seeing?

The car has 1 7/8" JBA longtubes, H-pipe/ no cats, and axleback. I don't know what size the pulleys are. I will measure when I get home. It makes 10.5 psi. Car is stock other than exhaust and procharger.

[ProCharge5.0]

Originally Posted by TrueStreetTim (Crank pulley size / Blower pulley size X step up ratio) X max rpm= impeller speed Bold items are simply to separate the math I'm assuming a lot here as I don't have all your specs. So your roughly 630whp? I'll also assume you've got headers & full exhaust? P1SC-1's max impeller (max efficiency) speed is 65k. It should also be a 4.1 gear (step-up) ratio. Your blower pulley roughly a 3.60? And crank pulley a 7.5. So [I](Crank pulley size / Blower pulley size x step up ratio) x max rpm= 61.5k impeller speed @ 7,200rpm. So your around 95% the max efficiency. To see that kind of power on a P1 I'm guessing the car is around 12-14psi. What kind of psi are you seeing?

Yes that is what size the pulleys are. Thanks for your help.