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

[Unas2k5]

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

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[Cory S]

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.

 

[Unas2k5]

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.

 

[ProChargerTECH]

80-100 rwhp is the normal gain I get going to E85 without a change in boost.

 

[Unas2k5]

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]

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]

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.....

 

[Unas2k5]

@Brad1810r80
@Cory S I spoke to a Procharger tech and that’s what he told me over the phone

 

[Cory S]

@Brad1810r80
@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.

 

[Unas2k5]

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]

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....

 

[5.0_Lojos]

4.63" is usually around 12-12.3psi at 7700-7850....

I went from a stock 4.74 to a 4.63 and there was zero change or notable drivability. Im installing a 4.25 soon and will datalog on pump 93. Reving to 6500 to 7k is cool with me and it wont be often.

 

[Cory S]

I went from a stock 4.74 to a 4.63 and there was zero change or notable drivability. Im installing a 4.25 soon and will datalog on pump 93. Reving to 6500 to 7k is cool with me and it wont be often.

4.63 to 4.25” is a huge drop. 93 octane won’t be enough knock suppression for that.

 

[5.0_Lojos]

4.63 to 4.25” is a huge drop. 93 octane won’t be enough knock suppression for that.

I am risking a lot lets see what the logs say.. Ill keep everyone posted.

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