The car is a stock bottom end LS1. I ported a typhoon intake, and it has 85mm tb. No MAF, 4" silicone coupler between the lid (standard SLP lid, not a bigger one) and tb. Atmosphere was at 98, and the lowest recorded kpa was 95, briefly, the majority of the upper rpm range was at 96.

How much of a restriction is the intake acting as? Is a standard issue replacement lid a restriction in any case?

I'm kind of new to this and was hoping someone might shed some insight.. thanks!

 

what intake manifold do you have, and what's the peak airflow do you get?

 

95kPa/98kPa is roughly 97% of ideal, as far as that goes.

However when you are looking at manifolds, the MAP is
plenum pressure and doesn't really tell you about the flow.
A manifold with better runners will draw the plenum down
harder than one that's got skinny or inferior runners.

Similarly a cammed car is going to pull down harder against
the TB/MAF/filter/lid pressure-drop stackup than a stocker.

 

The proffessional products 85mm typhoon. I wanted to see how far I could push it since I already had it.