Low Boost HELP!!!

**Nasty93** · 07-29-2009, 02:30 PM

I dont think they even have a 2psi pulley, gotta be going somewhere

**BLOWNDFIZ** · 07-29-2009, 02:54 PM

Check the bypass valve again. Make sure the vacuum line is connected to it. Make sure all the hose connections are actually connected. If the boost is not escaping then I'd say the head unit needs inspected. Time to trade it in on a T or YSi...

**1toofastlt1** · 08-08-2009, 05:46 PM

i have a 6 inch crank pulley i think that was the problem. 3.33 was making me 2 psi so i got a 2.95 and im making about 4 psi. WTF! do i need a smaller supercharger pulley or do i get a bigger crank pulley?

***popo8*** · 08-08-2009, 08:20 PM

Out of curiosity, what heads do you have on your car, and do you have any work done to them?

I lost 2 pounds of boost when I had head work done before. It was explained to me like this:

If you blow through a straw you will build more pressure than if you blow through a garden hose.....

**BLOWNDFIZ** · 08-08-2009, 10:58 PM

Originally Posted by 1toofastlt1

i have a 6 inch crank pulley i think that was the problem. 3.33 was making me 2 psi so i got a 2.95 and im making about 4 psi. WTF! do i need a smaller supercharger pulley or do i get a bigger crank pulley?

You should be making 8-10 with a 6", 2.95" combo.

You make more boost going with a bigger crank and/or smaller blower. The problem is the 6" is the only Vortech pulley available unless you go with a custom pulley from ASP or something. That is what I did.

**1toofastlt1** · 08-09-2009, 02:42 PM

my heads are stock, I guess i will just run the 4 psi and be happy with it till i can build the motor. It fast enough i guess, i got a ticket for speeding today