Boost / vacuum line routing 92 HDJ81 (1 Viewer)

[SegFault]

Installed my new turbo this weekend (love it) however I noticed my routing for the lines didn’t really match what I’ve seen on others pictures of their engine bay.

I’m just trying to make sure it’s routed right, in the case of my fuel pump it was routed to this vs coming off the manifold:

The manifold tees off and goes to my boost controller and these two devices I can’t identify (the bottom of one has a vacuum line connection that isn’t attached to anything)

I rerouted the line from the IP back to the manifold and disconnected it from whatever it was connected to before, I gained 3 PSI of boost (near where I should be with the wastegate spring I have installed, still 5psi lower than it should be). Any help with the routing would be appreciated, thanks!

 

[Echelon]

The hose going to your boost compensator on top of the IP should go to your ac idle up.

The two sensors are for the red and green turbo lights on the dash. Stock the hoses leave the manifold, just above the valve cover, with one hose going to the boost light sensors and one hose going to the IP.

Your boost controller should be connected to the wastegate actuator.

 

[Jroc561]

What turbo did you go with?

 

[Feistl]

The hose going to your boost compensator on top of the IP should go to your ac idle up.

Are you sure?

The top hose of the injector pump should go straight to the intake manifold... it adjusts how much fuel is going in based on boost pressure.

The A/C idle up vacuum line should go to the vacuum pump on one end, and to the idle up actuation arm on the other that’s bolted to the injection pump. That way when you supply vacuum by activating that solenoid the vacuum causes the mechcanical arm to increase the rpm of the engine.

If you’re supplying vacuum to the injector pump you’re effectively running without a turbo (Eg no extra fuel for the turbo boost pressure).

 

[SegFault]

Mamba TD05H-20G, so far zero regrets.

As for the vacuum lines I’ve simplified it since I had the A/C removed for the turbo install (it wasn’t filled since I had it imported. So no loss not having it). I have it going to the fuel pump, my boost gauge and to the little guys that provide the boost light. Thanks again for the help!

What turbo did you go with?

 

[Echelon]

Are you sure?

The top hose of the injector pump should go straight to the intake manifold... it adjusts how much fuel is going in based on boost pressure.

The A/C idle up vacuum line should go to the vacuum pump on one end, and to the idle up actuation arm on the other that’s bolted to the injection pump. That way when you supply vacuum by activating that solenoid the vacuum causes the mechcanical arm to increase the rpm of the engine.

If you’re supplying vacuum to the injector pump you’re effectively running without a turbo (Eg no extra fuel for the turbo boost pressure).

Yes I was saying it is currently wrong in reference to the picture he posted. That as it currently sit he needs to remove that hose on top of the IP and put it to the ac idle up actuator. Then he needs to run a hose from the manifold to the boost compensator so it actually works. So we are saying the same thing.

 

[SegFault]

Unfortunately that’s how it was routed when I bought it, and I’ve run it that way for almost a year. I didn’t think it looked right And fixed it when I installed the new turbo. I was second guessing it’s routing so I posted how it was setup before I changed it to make sure I didn’t muck it up (the previous owner in Japan had a bunch of things not hooked up / random s*** added like a million grounding cables etc...). Surprised it ran as good as it did honestly. I’m

I’m sure the engine suffered from it but it’s still chugging along. when I tear it down next year for a complete rebuild I’ll see what it did to the motor.

Yes I was saying it is currently wrong in reference to the picture he posted. That as it currently sit he needs to remove that hose on top of the IP and put it to the ac idle up actuator. Then he needs to run a hose from the manifold to the boost compensator so it actually works. So we are saying the same thing.

 

[Echelon]

It wouldn't have caused any damage. It would have been under fueled and therefore low EGT's unless the main fuel screw was turned in to make up for the boost compensator not working. It would have been really smoky down low if that was the case. Glad you have it sorted out.

 

[veiloctane]

Mamba TD05H-20G, so far zero regrets.

As for the vacuum lines I’ve simplified it since I had the A/C removed for the turbo install (it wasn’t filled since I had it imported. So no loss not having it). I have it going to the fuel pump, my boost gauge and to the little guys that provide the boost light. Thanks again for the help!

hi interested in what specific turbo you got I noticed on Mamba's website they have many choices. mainly the Wheel specs 12-6 12-11 9-11 9-6
if you got a link to which one you got I would love to check it out as I am also due for turbo replacement