i hear detonation but can't see it

[ASSAMI]

Hello guys ,

How can I know if the knock sensors are lazy ??

I have this, Chevy CAMARO that I'm trying to tune. Everything is fine on the DYNO but when I went out for a road test it hit me !!!

The dam engine is detonating like hell …. I can hear it so clearly when I put the windows up ( low RPM part throttle – high RPM WOT )!!!!
The problem is I can not see anything on my scanner it shows 0° of knock even if I melting the engine !!!!


Please look at the file and tell me if I'm doing anything wrong ?


Thanks for your help guys

[ASSAMI]

Here is the scam for that same vehicle with the same tune .

As you can see there is not a single detonation that was deducted !!!

As I said you can clearly hear that detonation under load with the windows closed .

I thought for a moment that it was filed detonation . I added 4 liters( one gallon ) of C16 to a half full tank and the car was running like crazy with not a single det that I've heard . That makes what I was hearing for sure is detonation before the C16


Hope this helps you to help me

[joecar]

ASSAMI,

Several things from looking at your files:
- looks like there is too much spark advance for a 2002 F-body;
- IAT settles to 38C/100F after car is going, so the ambient air is hot (where are you located...?);
- LTFT's are zero throughout, running OL, do you know the AFR...?
- MAP sensor hits 95 kPa at WOT, does this match your elevation...?
- Injector duty cycle hits 90%, it's getting close.

The knock sensors may not hear all knock, and they do degrade over time;
also, changing engine internals may move the knock resonant frequency.

[RonC]

It looks like several changes have been made to the Knock and the Knock-Software settings. You might trying resetting to stock and start over to see if it knocks with those settings. I think some of your spark curves could use a little reworking and it would improve driveability after you find your no-knock problem.

[johnsZ06]

Check out the TPS. It stays on "0" until he's up to 85 mph!

Of course, that doesn't have anything to do with your problem but a few PIDs are based on throttle position.

[joecar]

Check out the TPS. It stays on "0" until he's up to 85 mph!

Of course, that doesn't have anything to do with your problem but a few PIDs are based on throttle position.

I didn't see that one... yes, that's very important.

[johnsZ06]

You should pull some of the timing as well. No need to go over 40 degrees on an LS1 at cruise.

[ASSAMI]

joecar:

Several things from looking at your files:

- looks like there is too much spark advance for a 2002 F-body; (( I JUST WANTED YOU PEPOLE TO SEE THAT THE KNOCK IS NOT HEARING ANYTHING IT IS DOWN 5D NOW))

- IAT settles to 38C/100F after car is going, so the ambient air is hot (where are you located...? (( SAUDI ARABIA THE OUTSAID TIMP IS 29c ))

- LTFT's are zero throughout, running OL, do you know the AFR...? (( ON THE DYNO IS 12.8 AT MAX TORQ AND 13 UP END ))

- MAP sensor hits 95 kPa at WOT, does this match your elevation...? (( SEA LEVEL ))

- Injector duty cycle hits 90%, it's getting close. (( YES THANKS ))


The knock sensors may not hear all knock, and they do degrade over time;(( CAN YOU EXPLAIN ))

Also, changing engine internals may move the knock resonant frequency.(( THE CAR CAME WITH AFR 64cc AND A SMALL CAM. DOING 362whp ))

[ASSAMI]

It looks like several changes have been made to the Knock and the Knock-Software settings. You might trying resetting to stock and start over to see if it knocks with those settings. I think some of your spark curves could use a little reworking and it would improve driveability after you find your no-knock problem.

I DID…. ITS ALMOST THE SAME L

[ASSAMI]

Check out the TPS. It stays on "0" until he's up to 85 mph!

Of course, that doesn't have anything to do with your problem but a few PIDs are based on throttle position.

CANT SEE IT ? WHAT ARE U TALKING ABOUT !!