Boost Question

[FlyBy763]

So I know going from a stock intake to an aftermarket one you will lose some boost, but how much? Im making about 5 pounds right now, does that seem right with a stock 6-8 lb pulley? or do i have bigger problems?

 

[94gsl5.0]

Check your belt could be slipping.... How high are you revving?

 

[FlyBy763]

Check your belt could be slipping.... How high are you revving?

5500ish...Not real high.

 

[94gsl5.0]

My set up when similar to yours was yeilding similar boost numbers as you at 5500 with a slipping belt and the stock SC inlet. Once the belt was tightened i was seeing closer to 8 and 9#'s at 6000 rpm's.

Are you using the stock tach to judge rpm's? I have found mine was reading higher than the motor was actually turning.

Anywhich way.... You should see lower boost with a better intake manifold.... and thats a good thing More effiecient = more power with less heat.

 

[v6v8swap]

My set up when similar to yours was yeilding similar boost numbers as you at 5500 with a slipping belt and the stock SC inlet. Once the belt was tightened i was seeing closer to 8 and 9#'s at 6000 rpm's.

Are you using the stock tach to judge rpm's? I have found mine was reading higher than the motor was actually turning.

Anywhich way.... You should see lower boost with a better intake manifold.... and thats a good thing More effiecient = more power with less heat.

I agree with this. Less boost isn't always a bad thing. More airflow potential equals better power. One of the magazines, sometime in the recent past, did a test that was something like this and they made more power with less boost with a free-er flowing intake system. Having said that, I would def. make sure you're not losing some psi to a slipping belt etc. You don't want to lose power that way after investing in a SC'd setup.


Phil