Turbo BS Thread

It’s referenced one of the three ports on the throttle body

 

Does the FPR see vacuum? It shouldn't.

 

I don’t think those TB ports see vac. I hooked up my boost to all of them and none of the read vac. Only got a reading once the motor went into boost.

On another note. I currently have mine hooked up so it sees both vac and boost. The vac signal helps to trim the fuel of the larger injectors at idle. I have had no issues with how it runs. I still need to post a screen shot of my FT’s with the 440’s and stock ecu. I keep forgetting

 

If you're on stock ECU, yeah that probably does help lower fuel pressure and trims. And before I knew better, I ran FPR hooked to vacuum and boost on the 5vz for over a year and it ran fine...

@Jstand does your fuel pressure rise as you give it more throttle? (indicating low voltage((failing alternator?)) or FRP hooked to vacuum source)

 

It falls drops to 20psi with more throttle

 

I wondered though if it was voltage related but if that would cause the pressure to raise with more throttle then that’s out.

 

Would something electrical cause a steady fuel pressure drop ?

 

Steady in what way? Like, steady drop at idle, or steady drop when adding throttle input?

 

If you remove the vacuum hose to the FPR, and cap/plug the ends, what does the fuel pressure read?

 

It just stays in one place at idle. When you put throttle and let off it drops at least 5 psi then back to when it’s idling

 

I’ll check this tomorrow and get back with you but I don’t think it will change because it’s boost referenced no vac at idle

 

I wonder if you have crap in your fuel lines. This has been going on for a while, and the changes you have made have made no difference

 

Also put a voltmeter on your battery while running and verify you get 14+ volts

 

I thought you were supposed to reference the FPR directly to as close to the snail as possible?

 

I believe this is where some of the problem lies. Like being in the middle of a magnetic field and trying to use a compass.

 

No. Post throttle body for a vacuum/non vacuum or boost reference, or pre throttle body for the Venturi or whatever it’s called method of regulation.

With boost, it needs to be Post throttle body. NOT throttle body.

Post throttle body means that it is raising the fuel pressure for the amount of actual boost the intake manifold is getting. Not what is coming out of the turbo, as there could be a psi drop from turbo to intake manifold.

 

Hope I haven't missed too much that's impotent to the #boosted2.7lyfe

I did this, though:

https://youtu.be/pabsdbK13Jw

 

So at least a new muffler. Sounds good. Is that all, or anything else?

 

OK I'll put a volt meter to check for 14v. I wish it weren't so but I've been running it with the FPR in this same spot when the pressure was 45-50 psi since the beginning. I want it to be in the correct spot so I will move it.

 

Just the muffler, for now.