Pinging after Performance Tune with Predator

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01mgvert

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Jan 12, 2004

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Apr 23, 2004

#1

• Apr 23, 2004

• #1

Two days ago I installed the Diablo performance tune with the Predator. Now when I accelerate in first gear, the engine pings (sounds like knocking). When I accelerate in other gears, the engine runs fine. I am using premium gas (91 octane) as the instructions require. The diagnostic tool in the Predator listed my idle timing at 14 degrees. Do I need to lower this to prevent the pinging? Are there any other reasons for this noise?

 

LI98GTStang

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Apr 23, 2004

#2

• Apr 23, 2004

• #2

Have you tried octane boost to see if it goes away? Either way, I would suggest calling the place where you bought it from or Diablo directly to see if there is something that can be done.

 

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01mgvert

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Jan 12, 2004

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Apr 23, 2004

#3

• Apr 23, 2004

• #3

I sent an e-mail to Diablo today, but I wanted to get some feedback from fellow stangers. I am primarily interested in the danger of the pinging. For example, is this the same as detonation.

I have tried any octane boost yet. I might just use the Predator to modify the timing in the performance tune. That is one of the benefits of the Predator: You can install the Diablo performance tune and still have the option to modify the tune.

 

stangman

15 Year Member

Jul 10, 2003

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Apr 23, 2004

#4

• Apr 23, 2004

• #4

i would play with the timing on it, & see if that helps it. that's what it sounds like to me

 

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01mgvert

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Jan 12, 2004

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Apr 23, 2004

#5

• Apr 23, 2004

• #5

I read on another discussion board that some guys were getting better performance with the timing set at 12-13 degrees. I will try backing mine down to see if that helps. Again, the pinging makes me nervous.

 

SonicB

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Apr 29, 2002

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Apr 23, 2004

#6

• Apr 23, 2004

• #6

must use premium gas.

 

O

okc2KGT

New Member

Oct 27, 2003

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Oklahoma City

Apr 23, 2004

#7

• Apr 23, 2004

• #7

91 is premium

 

COramprat

...I can take it. I think.

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Mar 2, 2003

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Sea of Tranquility

Apr 23, 2004

#8

• Apr 23, 2004

• #8

01mgvert said:

I read on another discussion board that some guys were getting better performance with the timing set at 12-13 degrees. I will try backing mine down to see if that helps. Again, the pinging makes me nervous.

Click to expand...

My bet is that is the problem. Adjust your timing and it shoud go away.

 

Go HoTO!

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Apr 11, 2004

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Apr 23, 2004

#9

• Apr 23, 2004

• #9

Pinging is basically the same thing as detonation. It will tend to ocurr most readily under stress conditions such as load (towing, hills, WOT...) and when the ambient temps are higher.

If your car is pinging, the timing is advanced to much for the fuel that you are using. Think of "Octane" as meaning "resistance to pinging". The more octane, the greater the resistance to pinging. Either less timing or more octance should correct the problem.

 

holler

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Dec 5, 2000

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Apr 24, 2004

#10

• Apr 24, 2004

• #10

try finding a sunaco station with 93 and 94 octane and see if that helps.

 

Beau

Founding Member

Jan 29, 2000

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Apr 24, 2004

#11

• Apr 24, 2004

• #11

just bump the timing back down a few degrees and I think you'll be just fine

 

grodgers

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Aug 21, 2003

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Apr 24, 2004

#12

• Apr 24, 2004

• #12

IIRC...

01mgvert said:

Two days ago I installed the Diablo performance tune with the Predator. Now when I accelerate in first gear, the engine pings (sounds like knocking). When I accelerate in other gears, the engine runs fine. I am using premium gas (91 octane) as the instructions require. The diagnostic tool in the Predator listed my idle timing at 14 degrees. Do I need to lower this to prevent the pinging? Are there any other reasons for this noise?

Click to expand...

Doesn't the performance tune require 93 Octane?

 

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01mgvert

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Jan 12, 2004

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Apr 24, 2004

#13

• Apr 24, 2004

• #13

grodgers said:

Doesn't the performance tune require 93 Octane?

Click to expand...

The Diablo literature states that only 91 octane is required for their performance tune.

 

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01mgvert

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Jan 12, 2004

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Apr 24, 2004

#14

• Apr 24, 2004

• #14

1990StangLX said:

just bump the timing back down a few degrees and I think you'll be just fine

Click to expand...

I tried this but the noise is still there.

I put in a C & L TrueFlow inlet pipe at the same time. Could this be rattling? The only time the noise occurs is during first gear acceleration. Again, the noise sounds more like knocking than pinging.

 

7

702 bullitt

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Aug 8, 2003

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ST. LOUIS

Apr 24, 2004

#15

• Apr 24, 2004

• #15

My diablo flip chip clearly states the use of 93 octane not 91 unless the predators tune has a little less timing.

 

twogts4us

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Apr 1, 2004

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Apr 24, 2004

#16

• Apr 24, 2004

• #16

Make sure the Trueflow isn't impacting anything, like the shock tower - I didn't have any problem with mine, but I guess it is possible. If you still have pinging after dropping the timing down to 12 or 13, then I'd drop it a bit further, or reset back to stock and start over. I'd also recommend 93 octane, or just add some octane booster to the tank. Detonation, or pre-ignition is potentially VERY damaging. That sound is your cylinder walls essentially rattling from a soundwave created by the A/F mixture exploding before its time! Sounds scary, eh?

 

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01mgvert

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Jan 12, 2004

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Apr 24, 2004

#17

• Apr 24, 2004

• #17

Problem solved. The C & L TrueFlow inlet pipe was bumping against the Steeda strut tower brace. There is a 1/4 inch between the parts so I put a rag between them and the noise went away. The engine must really buck during acceleration in first gear.