Cobra4B

Just curious... I added 3-5 gallons of 100 octane to my tank each day at VIR this past weekend.

My car was tuned to 13.0:1 at WOT in February. I'm guessing this is good... when it gets hot the car will get less air and get richer, correct? Where as if the car was tuned to 13.0:1 in the summer heat... it'd possibly go lean in the cold months when the air is denser correct?

I hear people saying they can detect pinging on track... how? With a helmet on, windows down, loud exhaust, header noise, driveline noises etc.... that's a bunch of other noise.

Everyone says marbles in a can etc... is it something that overpowers the exhaust note?

wallyman424

by the time you physically HEAR detonation, your motor has sustained pretty serious damage.

Now, if you log the timing and whatnot, you can see where the motor and ECU see pinging. The ECU will pull timing, and a lot of people look for that as a sign of detonation.

2000BSME

those people are driving in high gears coming out of a slow turn (kinda like a grandpa if you know what I mean). That's the only way I could think that you could hear it.

Falcon

Hell, I'm a grandpa, but I try not to lug the engine.

ErnieN85

Ya, around here it's great grandpa,
The Grandads are kind of fast

Axelrod

Log it. Knock retard is the tell tale sign.

wallyman424

ya dont have to be so vulgar about it. i mean, brian might be a bit slow, but that doesnt warrant name calling.

Axelrod

Glad someone has a sense of humor as warped as mine

Cobra4B

Slow? It's hard to go fast when you smash into the armco comming out of turn 1 at VIR

wallyman424

ouuuuuuuuuuuuch.

and, i meant slow... mentally.

Mikelly

Brian, Two years ago this last weekend we were at the track together I think... That was the weekend my car threw a rod... In the video tape, you can clearly hear the rod knocking... I could NOT hear it from inside the car with the helmet on... Until it holed the block... If I couldn't hear a ROD KNOCKING, I ain't gonna hear detonation...

Food for thought.
Mike

AU N EGL

That armco is 200 feet from turn 1

Cobra4B

Sorry turn 2 then... I didn't realize they considered those 2 turns... I thought the left curve before 3 was 2.

Cobra4B

Very true... so was it rod knock that lead to that failure? I assumed it was a weak pre-2001 rod bolt letting go.

gpm30236

Brian , have had that issue, blew engine #2 at Rd Atlanta in dec when it leaned out lost half of the upper ring land of #7 and the pieces were sucked up into the intake and hammered #3 as well as stacked the bearings , have taken a break from track events other than the russel school at infineon while rebuilding , and retuning .

Have added an A/F gauge where the radio was to try to minimize the time that i would have a lean condition and not know it , also have the potential with the tuning software to log the events as i drive. Its been a tedious process but am learning a lot .

Cobra4B

Geeze... another motor gone! Not good... hope to see you out there again.

BTW who makes that crazy tow rig you have?

Falcon

Not only that, but it was the infamous #7 cylinder.

I was talking to a racer who has a LS6 in his car and he said they blew one up and discovered the fule pump wasn't pumping correctly and it was creating a lean condition that led to their problem.

Glen, your's was a built modded engine, wasn't it?

Z06cool

In 3rd out of Oak Tree and wouldn't hear it (or something like it) until the upper RPMs - above 4500. Shift into 4th and start hearing it again at upper RPMs. Very faint "marbles in a can". Only other thing I thought it could be was ruble/marbles on the track but wouldn't think there's that much, plus that spins off after a little bit. So call my crazy.

hardlight

Stepped on a few grandpa's crankshaft's, glad to see so many chimed in. My headers and Borla Stingers at 120 plus next to the wall are awesome. That with some hearing loss due to being around jet engines for 30 years leaves me depending on the grandsons for ping detection.

0Randy@DRM

Roll up the windows for a lap or two. It will get rid of a ton of sound. Plus you will be a couple 1/10th quicker too.

Randy