Running Lean, and knocking.

[djj624]

Took the car out for a drive yesterday after not driving it for a couple of months. Prior to this drive i installed a double pumper, fuel filter, new plugs, and dialed down the boost to 17/18psi. I filled up the Alky tank and away i went. Car felt strong but had alot of knock, so i pulled over and upped fuel in the chip +5%. Took it back out and still knocking. Then i turned up the alky gain knob to 7 1/2, and still got knock. I headed home at this point to grab a bite to eat. After dinner i upped fuel in the chip to +9% took her out and still got knock. On that run a recorded a PL file. When i got home i let the car cool off and pulled some plugs to my surprise they were WHITE as a ghost. I was checking out my Double Pumper install and noticed I forgot to groung the black ground wire where the pump drops in and connectors from the pump and hotwire go together.. Was this not being grounded causing my problem. I can hear the first pump kick on when i turn key on ignition. And i have 40psi of fuel pressure at the rail(vac on).

Here is the PL file
View attachment blast.dat.zip..

Let me know what you think.

 

[Bigjack7440]

Did you raise the fuel pressure . I gave my TT chip more fuel +5 but I did add more fuel pressure so it did not change at all . 42lbs with the line off , that should do it. Good luck

 

[djj624]

Its set to 42 line off.

 

[TurboBuRick]

Are you able to verify fuel pressure is rising with boost?

 

[mygn276]

Check your second pump at the switch to see if its turning on.

 

[djj624]

How can i check it , not sure what you mean, at the switch?

 

[HEATSEEKER]

I hade the same problem, i have the corect fuel pressure at the rail when idle.
I lost the half fuel pressure when i hade full gas, it was the ground on the doubel pumper installation that not had enough ground.

 

[Eric Stage I]

At 17psi, your MAF reading is 230gr/sec. Should be 255.

 

[djj624]

Eric what exactly does that tell you. I'm still trying to learn what all the readings tell me exactly.

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[jasjamz]

You have a lot of fuel pump there fella. Try a MAF.

 

[djj624]

Heetseeker. I'm going to ground that tomorrow morning. Then tape my fuel pressure gauge to the window and carefully make some passes.

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