Procharged stage 2 , 4.25 pulley going to E85 same pulley how much increase of HP?

Unas2k5

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I have a stage 2 procharged 15 Mustang GT I have the 4.25 pulley . I was told that the 4.25 is from 10-14psi and it shouldn't be ran on 93 with more boost.

Now with this same pulley and e85 how much of a HP difference would I see?

Thanks

 

Cory S

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Depends how much timing you will see before and after the fuel change.....

If you are capped at lets say 17.5 degrees of spark on gas, and now your E85 calibration allows 22 degrees, you could probably see around 75-100whp gain. YMMV.
 
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Unas2k5

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Depends how much timing you will see before and after the fuel change.....

If you are capped at lets say 17.5 degrees of spark on gas, and now your E85 calibration allows 22 degrees, you could probably see around 75-100whp gain. YMMV.
Ok thanks. 100WHP would be great. I Paid $2400 for the L2 Fore and the install is gonna be $1450.
Im just trying to stay at a pulley size I can run with both fuels instead of swapping pulleys and belts all the time.
 
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Unas2k5

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80-100 rwhp is the normal gain I get going to E85 without a change in boost.
If I have long tubes I lose 2-3 PSI im told so what size pulley should I make up for that I want 12PSI
 


Brad1810r80

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i don’t think you’ll lose that much boost , I’d see what the car is making after long tube install.

If I have long tubes I lose 2-3 PSI im told so what size pulley should I make up for that I want 12PSI
 

Cory S

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i don’t think you’ll lose that much boost , I’d see what the car is making after long tube install.
Agreed. 1-1.5 max.....
 
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@Brad1810r80
@Cory S I spoke to a Procharger tech and that’s what he told me over the phone
 

Cory S

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@Cory S I spoke to a Procharger tech and that’s what he told me over the phone
Don't always rely on $16.00/hr phone techs. Most of the time they are quick turnover fill in employees..

You aren't losing more than 1.5psi of boost from going to long tubes on less than a 1000whp setup. Period.
 
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Unas2k5

Unas2k5

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Don't always rely on $16.00/hr phone techs. Most of the time they are quick turnover fill in employees..

You aren't losing more than 1.5psi of boost from going to long tubes on less than a 1000whp setup. Period.
Ok thanks. So the one in my P1x car is 4.75 that’s rated at 9psi and he said each tenth smaller is 1 psi. I want 12 psi so what size would get me closest to that ?
 

Cory S

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Ok thanks. So the one in my P1x car is 4.75 that’s rated at 9psi and he said each tenth smaller is 1 psi. I want 12 psi so what size would get me closest to that ?
4.63" is usually around 12-12.3psi at 7700-7850....
 

 
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