Hello

I bought 88 GTA which has a 355 engine with blown pistons, headers, RAM air inlet, ATI Procharger P-1sc, MSD 6BTM fire box.

Boost clock shows only 5 PSI when the gas pedal is on the groud. Visual pipe leaks dont see beetween procharger to Ram air but somewhere the boost goes away.

During factory data smaller pulley form procharger should give out 12 PSI. I have installed smaller 85 mm pulley.

Where i shoud start sheck the problem?

I thought that is there any change that MSD 6 BTM firebox controll the boost and dont allow more than 5 psi because it is changed previus owner.

I have seen on JEGS catalog that togheter with MSD 6 BTM box olso must be some controller ( dashborad mounting) where can be turn ingnition later 1 degree untill 15 degrees and all this are controlled thrue the current boost.

In my car i didnt find the control unit. Can be like that the controller is removed and the most lower setup controls the boost?

People who have experience with 6BTM fire box i wait your comments.