VANOS Codes After Drivetrain Malfunction on Track

[torpeteo]

Looking to get some leads on what I can chase down before we start teardown.

We had a track event this weekend, car ran well until our third session out and after 5 laps went into limp mode with a drivetrain malfunction. Was coming out of T5 at Autobahn South, 4th gear and lower RPMs (5-6k) when power shut down. Brought the car back into paddock, noticed a faint pulsation in the exhaust tone, turned it off and scanned the codes. It gave me a 13308: VANOS exhaust position not reached, and 120408: Charging pressure control switchoff. Initially I was thinking maybe the VANOS exhaust solenoid took a dump.

We trailered the car home, pulled it into the garage, re-scanned the codes (image below) with car running and got more faults on both intake/exhaust cams with same pulsation in exhaust tone. From the front the motor sounds okay in my perspective. This would be quite the coincidence that both VANOS solenoids fail, so Im wondering if the car skipped timing or slack in chain tensionor? I did notice what seemed like a slight drivetrain grinding noise back to the paddock, but not sure if it was in my head and just the NVH from the suspension/driveline. Car is a 2017 ZCP 6mt on stock engine/power with pinned crank hub.

[chewbakam4]

Could be that one solenoid failed and caused the other to also throw a code.

[Tech567]

Looks like crankhub spinnage faults. Happens a lot with downshifting or kick down.

[Theruleslawyer]

Originally Posted by Tech567

Looks like crankhub spinnage faults. Happens a lot with downshifting or kick down.

"Car is a 2017 ZCP 6mt on stock engine/power with pinned crank hub"

unlikely.

[slaughter.mode]

I know a pinned crank hub is pretty specific but can you clarify the parts installed? I have seen (even I have mistakenly used) the term pinned for things that correlate to the idea of the hub being un-spinnable. Just trying to approach with the good ol' deductive reasoning angle.

[torpeteo]

Originally Posted by slaughter.mode

I know a pinned crank hub is pretty specific but can you clarify the parts installed? I have seen (even I have mistakenly used) the term pinned for things that correlate to the idea of the hub being un-spinnable. Just trying to approach with the good ol' deductive reasoning angle.

RK Autowerks 4 pin crank hub with a crank bolt capture.

The car goes in tomorrow so it’ll be interesting on the assessment. I’m wondering if the timing chain stretched or tensioner failed which created some slack to disrupt the timing.

[slaughter.mode]

Originally Posted by torpeteo

RK Autowerks 4 pin crank hub with a crank bolt capture.

The car goes in tomorrow so it’ll be interesting on the assessment. I’m wondering if the timing chain stretched or tensioner failed which created some slack to disrupt the timing.

That's something I've not seen (being a chain) but anything is possible. Let us know. Hope it's not a costly fix.

[deli333]

Originally Posted by Tech567

Looks like crankhub spinnage faults. Happens a lot with downshifting or kick down.

4th gear and lower RPMs (5-6k) when power shut down

does not sound like kick down or downshift. stop making up things, most of the cars spin without kickdown or downshift.

I really wonder how you drive your cars, between 2 to 5k rpm, no hard brakes..

[Tech567]

Originally Posted by Theruleslawyer

"Car is a 2017 ZCP 6mt on stock engine/power with pinned crank hub"

unlikely.

Definitely something with the timing.