Novi 2200 setup and 3.33 upper stock lower pullyer max boost

[blownby]

Just a quick question....
Given stock motor, BOSS 302 intake & full exhaust with Long tubes, 6 rib kit, what should be the boost the 3.33 pulley will make say at 7,000 & 7500 rpm?

Seems like maybe 11 psi looking at my boost curve currently

 

[GBCoyote]

More than your stock motor can handle. Get a torque booster if you want to pulley down for a better power curve. 11psi is going to pop your motor. (Yes people have done it but it is VERY short lived)

 

[blownby]

Have the tq booster. Was juts curious as I expected to peak 10 psi sooner in rpm

 

[GBCoyote]

Your wastegate is going to determine your boost level then. The spring is what needs to be addressed. It comes with a spring for about 10lbs. So regardless of pulley size 10lbs is all you're going to make. The smaller the pulley will determine how soon you'll see the boost. So with a 3.33 pulley, you may see full boost at around 5k, but with a 3.15 pulley you may get full boost around 4600 or so, for example. Either way, an 8 rib setup is in your future. There are people who run the wastegate setup on a 6 rib successfully, there are more than a few who can't get it to run without belt slip.

 

[blownby]

Yeah I have the 10 psi spring but don't see 10 psi till like 7000,. So is the spring probably starting to slightly open early and bleed off a tad to slow the boost build

 

[blownby]

The boost curve looks like to slowly flatten around 5500 at 8 psi and then get to 10 psi by 7000

 

[GBCoyote]

You could have a boost leak. Never really watched what RPM mine hits full boost at to be honest, I just know it's faster than what it was.

 

[blownby]

I found this old thread and graph and my boost curve seems pretty similiar...

http://www.svtperformance.com/forum...r-quot-Package-for-Paxton-Vortech-coyote-cars