Why does my car ping?????

UnderPressureGT

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Dec 31, 2002

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TR- Jersey Shore

Oct 20, 2004

#1

• Oct 20, 2004

• #1

my cars timing is at 10, fuel pressure at 40, running 8-9 pounds of boost...

My car pinged real bad up top..... i then upped the fuel to 45... it made it a little better, but not totally.... i then took the 6:1 FMU disk out and pit a 10:1 in there.... it helped dramatically, but it still pings high in 3rd gear... WHY?!?!

 

5.0Droptop

...all those nights we shared, and you're a dude??

Special Agent Mukity-Muck Whats in Charge Round Here

May 15, 2002

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Indiana

Oct 20, 2004

#2

• Oct 20, 2004

• #2

ping = lean

 

FrdMustangCpe

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May 27, 2004

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Sin City, NV

Oct 20, 2004

#3

• Oct 20, 2004

• #3

you have a timing/boost retard gizmo?

 

UnderPressureGT

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Dec 31, 2002

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Oct 20, 2004

#4

• Oct 20, 2004

• #4

nope.. i thought about it.. the guy at downs ford told me not to get it ebcause its not worth it for how much boost im putting out.. i really doubt this.. but do i need one???

EDIT: FYI, my car started out at 12 timing and 40 fuel pressure right from the dyno.. id rove home and when it got to operational temp, it pinged REAL bad.... i retarded it to 8.5 and it didnt ping at all but it ran pretty crappy not under boost.. everytime i would shift hard out of boost, i would get fireballs from my mufflers under the car.... i then advanced the timing to 10 and it pinged also, which is where i started tweaking witht he fuel which helped, but not totally..... soo do i need a retard?

And are 24's ok for the power i am making??? if i were to switch to 30's i would need amss air correct?? someone told me my injectors are fine and my FMU is making them act bigger then what they really are

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

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Oct 21, 2004

#5

• Oct 21, 2004

• #5

ill add two cents (and not one cent more). to add to what was said above, compression (boost) leads to heat, which also causes detonation/preignition (two different things).

more than one guy has had a Boost retard mechanism fail at the track. i would rather run locked out timing - have you considered that?

good luck.

 

TT91

Active Member

May 23, 2003

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Paramus, NJ

Oct 21, 2004

#6

• Oct 21, 2004

• #6

colder spark plugs?

 

TT91

Active Member

May 23, 2003

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Paramus, NJ

Oct 21, 2004

#7

• Oct 21, 2004

• #7

he refuses to convert to mass air..

 

RydeOn

Licensed to Chill

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Sep 26, 2000

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orange county, CA

Oct 21, 2004

#8

• Oct 21, 2004

• #8

Probably because your running those little 24lb injectors with 9 psi. I dont see an upgraded fuel pump either. Im surprised the car aint blown up yet. 9 psi with a 10:1 FMU is well over 100psi fuel pressure thats needed to make them act the proper size. No fuel pump can do that. You need 36lb injectors so you can run no FMU, and in the 40-50psi range.

 

UnderPressureGT

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Dec 31, 2002

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Oct 21, 2004

#9

• Oct 21, 2004

• #9

sorry i forgot to mention.. i am running a 255 fuel pump soo tthere SHOULDNT be a reason im running out of fuel..

mike the plugs are autolite 24's gapped at .035
About converting to amss air.. i dont see that haveing anything to do with the problem

 

D

Daggar

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Jul 19, 2004

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Oct 21, 2004

#10

• Oct 21, 2004

• #10

You get that fuel pump replaced already Joe? I'm guessing so since you seem to be up and running again.