only making 3lbs of boost

the_target · #1 (**permalink**) 05-27-2009, 05:07 PM

This is a older tbi chev kit. I have a 55mm TBI built 383 with arf heads. I had the whipple rebuilt by Highspeed labs. the motor is running great but am looking for more boost

jared@lethal · #2 (**permalink**) 06-24-2009, 11:57 AM

Quote:

Originally Posted by the_target

This is a older tbi chev kit. I have a 55mm TBI built 383 with arf heads. I had the whipple rebuilt by Highspeed labs. the motor is running great but am looking for more boost

Put a smaller blower pulley on?

3.4Marauder · #3 (**permalink**) 06-24-2009, 12:10 PM

Is the bypass valve closing all the way?

the_target · #4 (**permalink**) 06-24-2009, 11:53 PM

Well I already have a 2.75 uppger and a 7.75 crank, I cannot spin that ol thing much higher

as for the bypass valve these dont have one

. I hate to say this but I may need to go to a procharger to make enough boost to make the motor happy

2bad05gto's · #5 (**permalink**) 06-28-2009, 10:50 PM

What compressor?

James B. · #6 (**permalink**) 06-29-2009, 09:13 PM

Some of those early kits were a 1.2L Autorotor compressor I think. The pulley size and boost you're describing do seem consistent with a 1.6L compressor on a 383, in my experience.

the_target · #7 (**permalink**) 07-02-2009, 06:21 PM

yes its the 1.6l. I am afraid that its just too small for the motor. the thought now is to go with a accel proram system with a DFI and twin turbo's.. Oh well I still have the whipple on my jeep