Hello everyone
I have an 89 EF Hatch with d15b2 DPFI I put a turbo on
I have a boost gauge and AF Gauge
I'm also running a Spa turbo FMU for fuel, My wastegate is set to 5psi and I run a boost controller, The issue I'm having is that the car won't boost over 1psi the turbo spools relatively quick and doesn't take too much time to hit 1psi but it won't go past.
I checked all the gaskets and charge piping to make sure there's no leak as well as the vacuum lines. Oddly enough when i reference the Intake Manifold for boost initially it gave me a vacuum reading under the 1 psi or not. for now, I run it after the boost controller it T'd it off from the wastegate so I could get an accurate reading.

I understand that the d15b2 is a terrible motor for boost even more so with DPFI before everyone gets up in arms about it. I'm currently building a d16y8 that's going in it and bought the turbo kit brand new as I'm planning to transplant it to the d16 when it's done.

Any help would be greatly appreciated

 

Sounds like you need a map bypass valve.

 

I’m wondering if he has a missing link on the MAP sensor or multiple one way check valves. When I used the FMU, one check valve wasn’t enough, I had to use like 3, not in line or in a strait row, but a box shape. The easiest way is the missing link but it’s like $70.

 

Thanks guys issue was solved here!

https://honda-tech.com/forums/honda-...ssues-3360942/