986 Boxster ChampCar Endurance racing build

[78F350]

Originally Posted by Endurance Racer

I've converted the car to a manual 5 speed. At this point couldn't find a way to get a lower gear ratio. ...

I'm curious... Not counting gathering parts, was the tip to manual swap straightforward/bolt-in? I have stripped a couple manual cars and probably have the parts. Are all the holes and mounting points for the manual stuff already there?

Have you looked at the aero with it open on the sides and rear? Seems like it would make a lot of turbulence (drag) at 70+ mph. I think that extending the sheeting of the roof further back (even shooting brake style) or putting a gurney flap at the back of the roof might reduce the drag at speed, but I'm just guessing.

[Endurance Racer]

Originally Posted by 78F350

I'm curious... Not counting gathering parts, was the tip to manual swap straightforward/bolt-in? I have stripped a couple manual cars and probably have the parts. Are all the holes and mounting points for the manual stuff already there?

Have you looked at the aero with it open on the sides and rear? Seems like it would make a lot of turbulence (drag) at 70+ mph. I think that extending the sheeting of the roof further back (even shooting brake style) or putting a gurney flap at the back of the roof might reduce the drag at speed, but I'm just guessing.

The tip to manual is fairly straight forward if you have all the bolt in parts.
The DME is common but the software is not. The Tip wire harness works, but you need to add a pin D1 to ground or add the clutch switch.


As far as drag well yes but extending panels adds points for material used that I can't afford. Its on an even playing field as all the cars run without widows and such and thus have drag (wind resistance) going thru the roll cage, B and C pillars on hard tops

[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.

[Endurance Racer]

Originally Posted by 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.

Thanks I really appreciate that, but its not going to work.

I believe I will need DME with Immobilizer and key together or it will not start.

Or replacement DME will need to be reflashed to work this my Immobilizer and key. I don't know of a source or person that has the capability to do that.

:

[78F350]

To clarify, This is what I have:

https://www.ebay.com/itm/155065766086?nma=true&si=MmbRQ601PC5CgEY138kHApcbDZY%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557


I bought it from that seller off eBay. It's currently in a 2004 2.7L car that runs, but shows an error for ABS coding. If nothing else, I figure that it could help with your diagnosis and only cost shipping to try it out.
To test your car, I would send the DME, Central locking module (immobilizer box), and the key fob - which houses the transponder for the immobilizer. It is from a Tiptronic car, but should be able to run the engine in your car - is the DME in your car the original Tiptronic?

I also have a DME and immobilizer box that originally came with the '04 2.7L car, but no key fob to go with it.

[Endurance Racer]

Hi All,

Time for a quick up date. With the car converted to a manual 5 speed and the crank sensor issue resolved, we went back to WGI. Man, I love this car. The braking and handling are just outstanding. So much nicer than the 944's. But not without issues. I think its cursed. We developed a fuel pressure issue. Only getting 40psi from the returnless 65psi system. Looking at pump, regulator or the in tank filter.

We ran the Continental Extreme Contact Force Tires. I could drive this thing anywhere on the track which was handy as there were 110 or so cars on track. I really like these tires. If you want to try these you can use my discount code SOFIANEKVIP You get 4 tires for the price of 3 with this discount. https://trackdaytire.com/continentalpreorder/

But, man is it fun when its running. At less with the 944's we got a 1st, 3rd, 4th and 6th with the 2 cars and 2 days of racing.