Crank already was Pinned so good to go there....SBC not LSx.

 

Bends are made out of 3 ply silicone. I'm really thinking more air box not getting enough air but possible.

 

So this you say is a 85-92 tuned port injection style manifold ?

I know they were awesome for low end TQ , but fell off up high , so with this in mind it really should be making boost higher RPMs due to restriction .

So do you see any signs of leaking gaskets around the plenum / intake runners ?

 

Have you verified boost with a mechanical gauge? If your inlet is suspect just take it off for testing purposes and see if it changes on your datalog. If it's an autotrans setup you can put a load on the engine in reverse and feel your hand around all your hose connections to find leaks. Also check the intercooler for leaks as well. You can also remove intercooler and pressurize it by plugging the ends with pipe plugs you can buy at your local hardware store pressurize to ten to 15 psi and check again in a minute or so. Also you can test for intercooler efficiency or if it's loosing boost by welding pipe bungs before/ after the intercooler and monitor boost pressure before and after, and check with your manufacturer and see what they feel is acceptable. Good luck you should probly find whether your issue is mechanical engine/ or kit/ or simple install error by these checks via process of elimination.

 

It's a 85-92 style system but using a Victor Jr intake and a 1550 cfm throttle body.

No signs of leaks.

 

Could timing cause this but having low timing or a bad ignition module? I had a spare MAP sensor 3 bar laying around and tried that one. It shows the same.

 

Could really use some more info about this build......

 

Post a pic of the engine bay.

 

I'll try and post a picture later tonight.

 

What you need to know?