BRP/SOT Hotside SC Install
Joined: Aug 2006
Posts: 3,214
Likes: 32
From: Huntsville, AL
neeman is correct it depends on your altitude, pulley selection and ambient temps. Boost is not the best thing to look at when it comes to a PD supercharger when trying to determine power output.
I am in Huntsville AL
Approx PSI Vs pulley size on a AP2 in huntsville.
(depending on supporting free flowing modifications)
AKA free flowing mods = less boost but more power at the wheels
126=6.5-6.8
135=8
142=9
To prove my point
Say you started with 8 psi making 350whp
Put on a restrictive exhaust and you are now sitting at 10psi but only making 330
Put on a free flowing exhaust and you are now sitting at 7 psi but making 360.
Its how much air you can get the motor to take in burn and pump out that determines power output not specifically the boost pressure.
I am in Huntsville AL
Approx PSI Vs pulley size on a AP2 in huntsville.
(depending on supporting free flowing modifications)
AKA free flowing mods = less boost but more power at the wheels
126=6.5-6.8
135=8
142=9
To prove my point
Say you started with 8 psi making 350whp
Put on a restrictive exhaust and you are now sitting at 10psi but only making 330
Put on a free flowing exhaust and you are now sitting at 7 psi but making 360.
Its how much air you can get the motor to take in burn and pump out that determines power output not specifically the boost pressure.
Joined: Jul 2006
Posts: 6,419
Likes: 0
From: The Antagonist
Originally Posted by MugenRioS2k,Apr 30 2008, 12:34 PM
neeman is correct it depends on your altitude, pulley selection and ambient temps. Boost is not the best thing to look at when it comes to a PD supercharger when trying to determine power output.
I am in Huntsville AL
Approx PSI Vs pulley size on a AP2 in huntsville.
(depending on supporting free flowing modifications)
AKA free flowing mods = less boost but more power at the wheels
126=6.5-6.8
135=8
142=9
To prove my point
Say you started with 8 psi making 350whp
Put on a restrictive exhaust and you are now sitting at 10psi but only making 330
Put on a free flowing exhaust and you are now sitting at 7 psi but making 360.
Its how much air you can get the motor to take in burn and pump out that determines power output not specifically the boost pressure.
I am in Huntsville AL
Approx PSI Vs pulley size on a AP2 in huntsville.
(depending on supporting free flowing modifications)
AKA free flowing mods = less boost but more power at the wheels
126=6.5-6.8
135=8
142=9
To prove my point
Say you started with 8 psi making 350whp
Put on a restrictive exhaust and you are now sitting at 10psi but only making 330
Put on a free flowing exhaust and you are now sitting at 7 psi but making 360.
Its how much air you can get the motor to take in burn and pump out that determines power output not specifically the boost pressure.
So this only applies to PD superchargers correct?
Joined: Nov 2006
Posts: 1,836
Likes: 1
From: Canada
More specifically for PD supechargers because a certain volume of air compressed into the engine depending on rpm rather than a wastegate. The density of the air (altitude and temperature dependant) will change the boost pressures. The restriction theory applies to all engines and FI setups which is most apparent when looking at turbo selection. A small restrictive turbo will make 280 hp at 10 psi but a larger free flowing will make 350 at 10 psi.
Joined: Nov 2004
Posts: 1,239
Likes: 13
From: Denver
I like this thread! Everyone who is seriously looking at this supercharger setup seems to know their stuff 
On another note, is the crank pulley going to be a custom unit or does it attach to the stock crank pulley?
On another note, is the crank pulley going to be a custom unit or does it attach to the stock crank pulley?
Joined: Aug 2006
Posts: 3,214
Likes: 32
From: Huntsville, AL
the kit includes a new OEM crank pulley that has been modified to receive the supercharger crank pulley(s).
The new modified OEM Crank pulley modular meaning once you install the modified crank pulley supplied with the kit you will never need to remove it later on if you decided to change the supercharger crank pulley for more boost.
The new modified OEM Crank pulley modular meaning once you install the modified crank pulley supplied with the kit you will never need to remove it later on if you decided to change the supercharger crank pulley for more boost.
Joined: Oct 2003
Posts: 11,950
Likes: 474
From: MAHT-O-MEDI
Originally Posted by MugenRioS2k,Apr 30 2008, 11:10 PM
the kit includes a new OEM crank pulley that has been modified to receive the supercharger crank pulley(s).
The new modified OEM Crank pulley modular meaning once you install the modified crank pulley supplied with the kit you will never need to remove it later on if you decided to change the supercharger crank pulley for more boost.
The new modified OEM Crank pulley modular meaning once you install the modified crank pulley supplied with the kit you will never need to remove it later on if you decided to change the supercharger crank pulley for more boost.
