I'm looking at the JLP uppers, and was wondering how much additional boost I can expect from a 2.8 upper? Right now all I have is a homemade fast air setup with a K&N. Would a 2.8 give me about 2 more pounds?

 

Thats a yes or no answer VTSVT
But yes you should see every bit of 12 lbs with a good Filter
and a 2.8 Upper (I DID, and thats how I originally started )
Of course I immediatly added a 4lb lower a week later,
(that was well over a yr ago)
Here's a quote form one of the Vendors of a 2.8


The stock Supercharger Pulley produces about 9 lb. of boost, whereas the DUB 2.80" Performance Supercharger Pulley has shown 12 lb. of boost by many owners of this unit. Also from one of our Vendors, we have an update from the Track over the weekend. One of the modified 2001 Ford Lightning's running a 12.82 ET with a stock SC Pulley, upgraded to the DUB 2.80" Performance SC Pulley and ran a 12.53 ET. That was not only a 3 lb. increase in Boost pressure, but also nearly 3/10's off their quarter-mile ET!!! How's that for performance??

BLACK IS BEAUTIFUL

 

I think a 2.80 pulley adds a 1 pound extra boost, the vendors all provide quality parts but Riechard uppers have a non belt slip design and look great, just another option.

 

Forget about a upper just get a lower, less slipage


PEacE.............
Jim