986 Boxster ChampCar Endurance racing build

[Endurance Racer]

I've been battling a P0336 code. RPM Circuit error.
Its kept me from 2 race events.

This is a 2003 2.7L 3 chain engine


I have verified the mechanical timing with the cam timing tool - The cams and crank are properly in sync.
The crank sensor is good. And a second sensor was tried and tested.
The wiring harness from sensor to DME is good
I can see engine RPM on the scan tool.




per Porsche diagnostics.
The DME (ECM) is bad.



Does anyone have a DME for a 2003 manual trans Boxster I could try to test?
Or a good source for the DME to purchase used?

[78F350]

I have a DME-Immobilizer set from a 2004 2.7L Tiptronic that I can loan you if that helps. I am open to selling it if it works for you.

[78F350]

Mrs 78F350 is dropping it off for shipping it as I type. Here's what is being sent:



The VIN that it is coded for shows a 2003 2.7L Tiptronic.

The transponder is inside the key fob. I'm not sure how your ignition is set up on the race car, but you can put your key blade in the fob, or just have it in position at the ignition when you turn your key - I expect that your original key fob will interfere if both are in proximity at the same time.

[Endurance Racer]

Well I'm at a loss battling the p0336 code.
Many thanks to @78F350 for lending me his DME, Immobilizer and transponder (key pill). I got the car to run with this loaner DME but still have the P0336 error.

I've checked the engine mechanical timing (all 4 cams and crank positions), the crank sensor (2 of them), the wiring to the DME and now a second DME.

I get RPM output on the tach and on the scan tool.

But still have an error.

[Endurance Racer]

Problem found.
I need to pull the transmission to get to the flywheel to see exactly what happened. Crank sensor had no damage.

:dance::dance:

[Endurance Racer]

Since I have to get a new flywheel, does anyone have a recommendation for a nice light weight flywheel?

[seningen]

Originally Posted by Endurance Racer

Since I have to get a new flywheel, does anyone have a recommendation for a nice light weight flywheel?

AASCO is what most spec boxster folks use

[Endurance Racer]

I'm reading that some don't think a lightweight low mass flywheel is a good idea becuase the engine vibrations lead to crank shaft failures.

[Quadcammer]

some dispute on that. Jake Raby, the so called god of the m96/m97 says not to use it, but plenty of race cars are so equipped with no real issues. just depends on your risk tolerance.