jslee225

http://youtu.be/l5KmxPMtSwY

Car was doing awesome all weekend even pulled double duty running 2 run groups by giving people rides. Not sure what happened but if you skip to 10 min you'll hear a loud fast buzzing noise appear around 7k right before I'm about to short shift to 3rd (i.e. did not shift). Then it was error code city! Found out later that some of the codes were camshaft and multiple cylinder misfire.

Good thing I was near the pits. Parked the car and shut it down and the car wouldn't start back up. Had car towed to dealer. I won't be able to sleep tonight

Any ideas what happened?

neoprufrok

Man sorry to hear.

Helping you post the video.

neoprufrok

Video listed as private...

Anyways, I worry about tracking the GT4 for these reasons, so please let us know what the dealer says. I know McLaren still honors the warranty even if they know I'm on track - as long as I do the pre and post inspections with the dealers.

zedcat

Sorry to hear. The 9A1 engine has overall been reliable since introduced in 09 and lots have been tracked, so a little surprising. But sometimes failures happen. Assume you didn't overrev it during the day? missed shift? Were you driving oem tires? What temps did you have? any warnings? Interested to hear the dealer diagnosis.

jslee225

No overrevs/mis shifts into wrong gear. Tires were RE71rs, but I must admit that I didn't keep an eye on the temps.

Car is stock engine wise besides fabspeed headers.

Jgarvish

I feel for you. Please let us know what happens. Good luck!

jslee225

thanks John. It was nice of you to come and introduce yourself!

Just spoke to my friendly service guy this morning and I hope to hear something back soon.

jslee225

When I stopped into the dealer and talked to the service guy this AM we somehow got into the conversation where I ended up saying "you obviously know I track the car right?" (It has rubber marks from the track, 3.5 degrees of camber, pagid pads, OZ wheels, and most of all, it was towed from COTA). He responded, "that is not a problem". He acted like it was no big deal. It gave me some relief, but I guess i'll find out soon enough!

Mech33

Very interested to hear if the headers cause any issue with repairs being covered under warranty.

bk_911

Damn right it's not a problem. Almost every piece of marketing material on this car shows it on the track in pictures. Not to mention the whole driving on the circuit supplemental owner's manual!!!

Good luck. Report back what the issue is when you get a chance.

Quack

Missed shift and over rev at around 7.30 min on the vid? Not accusing just observing. Hope everything will be OK for you.

Mech33

Doesn't look like the tech needle moves much during that mis-shift, so it doesn't seem like an over-rev.

Underblu

To the OP, good luck and keep us posted. As long as the wrong gear wasn't engaged forcing an over rev, the rev limiter should prevent an over rev in that instance where he didn't cleanly engage the proper gear.

neoprufrok

I read the manual back and forth and the warranty portion makes it pretty clear that the car is not covered if the car is being used in a track environment.

jslee225

Thanks to all for the get well wishes!

Just to clarify, I have put in about 4500 miles so far and not once have I "engaged" the wrong gear causing a material overrev. I may have missed a gear, but the gear was never engaged.

Dealer just called and they will have to take engine out today to investigate cams. Gt4 will have to be at the spa for at least a week. Will let everyone know asap.