i have a jrsc on a lsv with gsr head, on a base map with 440s, was told 8 psi i just put boost gauge not 8

need to know whats wrong first is it normal for vacuum to be at 20 at idle?
then 1st and 2nd&3rd gear w.o.t almost 6psi and drops to 4 at high rpm?
but 4th and 5th at 7psi then drops to 4psi at the top end?
any help woul be greatfull

cat has normal boltons,i,h,e headers are really pinched on the bottom, not sure if that has something to do with it

 

Maybe your filter is too restricting?
Where did you place your boost gauge vacuum line?

 

filter isnt open on the back end not sure , ill buy new one

boost line is teed off the back of charger, also the one that goes to fuell pressure reg?

 

Pinched header would lead to higher boost numbers, as the boost would back up in the intake manifold because it can't get through the motor. Are you belts tight, and not slipping? Usually when you loose boost at higher RPMs, it due to slipping belts.

 

X2-I have this problem with my Mustang. I had to go with wider pulleys with more ribs to fix the issue.

 

I had boost dropping off at high rpms also and tightened belts problem solved. Just remember the belt from crank to alt drives the alt which drives the blower so make sure you check both belts could be either belt causing boost loss

 

thanks guys for the info.... ill try that tmmrw long work day today, anybody heard of pullyboys.com the sell smaller pulleys for the charger...thinking about going with 2.6 size pulley need that boost lol....

 

i hope you mean 3.6, if your haveing slipping problems now...wait till you put a 2.6 on it, not to mention you'll probably blow somthing.

 

I got the car with the belt it has on it, 7pounds is not enough with 9.5.1 compresion