Fuel pressure/flow problem Push turbo M8

[hatchers]

And then comes the question, what is the standard fuel pressure? Mine reads 43-45 @ idle.

no such thing as a standard...the fuel box everyone has is mapped to a baseline fuel pressure and the engine you have.....other things come to concider, but each sled might have to raise or lower the idle fuel pressure depending on where your fuel box numbers end up after you tune the sled in to a good A/F of 12.4ish......keyword ish

i had to lower mine a bit from 39 to 36 idle because my green and green/blue was at 2 when dialed in, sure it would be ok for most, but my mid was too rich and i could not lower the mid enough

 

[hatchers]

side note - i took my old BD Nascar grade fuel reg apart two times, found nothing, replaced fuel pump and all way good...the last fuel pump i had go bad would just act up and die at idle, later in the day it would flat out not run......had to let the pump cool down for almost an hour before the sled would run again, then it would run for 2-3 hrs......drove me nuts!!!

 

[sweperformance]

Have the same problem on my BD PG 08 m8 running 6-7 psi @ sealevel.
When doing long pulls (35-40sec) the AF meter starts to climb..
Was thinking that the "non return" fuelrail/system could be the problem.
Do you have pictures of your install? Hard to weld on the OEM fuelrail?
Have the fuelpump and oil pump on the "fuelpump circuit" and a AEM AF and fuelpressure gauge thogeter with the BD box/EBC on the Aux outlet.

Have bought a walbro 255 pump and 875cc inj. if the the fuel rail mod does not work..

I will take some pics this week, took it apart today anyway .

 

[jijohans]

I will take some pics this week, took it apart today anyway .

Exelent, did recive my Aeromotive fpr on Saturday, now just waiting for the plug'n play harness for the high flow fuelpump to arrive...

 

[sweperformance]

This is the line from the fuelrail to the regulator, drilled a hole in the end of the rail and TIG welded a nut in place, very thin material.

Fuel pressure regulator.

Returnline from regulator to tank.

You can see the line from the rail to the reg, near the clutch.


// Daniel

 

[YETIms]

this is the way to go.

I installed the extern reg a little different. I welded a return line on the fuel rail where I connected the reg. The return on the reg goes to the tank. Now I have full flow to the fuel rail and adjust the pressure after the fuel rail. This should work even better, maybe a little overkill

 

[jijohans]

Did you do anything with the regulator in the tank or did you leave it as it is?

 

[product tester]

you have to block off the regulator in the tank...

 

[jijohans]

How? Pictures?

 

[sweperformance]

Yes you have to block the regulator in the tank. I think I put a skrew in the returnhole so the reg in the tank puts out max pressure. Have no pics of that but you will understand when you take it apart.

 

[jijohans]

Ok, I did find the procedure in the Boondocker Race gas manual...

 

[YETIms]

very good external regulator is SARD
cost around 100 USD

you can mount it on the fuel rail and connect the vacum from the charger tube direct to rise the pressure when hit the throttle