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The Wiring: I basically had to go through each individual system, understand from the schematics how they worked and what they communicated with to then determine how to integrate it with the Lotus, or if I could remove it without cause. Since a lot of the systems communicate via the canbus, and since there are modules which monitor the health of every sensor and switch in the donor vehicle, deciphering what was and was not needed was complicated. Hence the crazy prototype electronics board I ended up with. With all of the immobilizer features of the donor vehicle, it took a while to track them all down and bypass them so that I would not need to use the donor vehicle's wireless key fob or dash. I also had to have the ECU specially coded since I was bypassing the immobilizer items. As I mentioned earlier, the schematic diagrams manual for the VW was over 1000 pages. But it was well documented and I could track everything down I needed. The Lotus wiring is very simple comparatively.


The DSG: It indeed has all of the sensors it needs to operate, within. It uses items like the ABS as backup sensors should one fail in the transmission. The DSG communicates with the engine ecu via the drivetrain canbus. The shift selector does have a single physical cable, but it is solely a parking brake. When a DSG transmission is in Park, both clutches are disengaged, basically putting the transmission in Neutral, which would allow the vehicle to roll. The parking brake is internal to the DSG via cogs on the differential. When you move the shift selector to Park, that cable simply engages a pawl which interacts with the cogs to keep the vehicle from rolling. All information from the shift selector to tell the transmission which gear to be in (P, R, N, D, etc) is all done via the canbus. That is why I am able to remove the donor vehicle’s gear selector all together. I retrofitted the parking cable to work with the stock Lotus parking brake lever and am working with a guy from Lithuania (a canbus guru!) to code a microcontroller so I can select the gears via buttons on my console. This part has also been quite the science project in itself. Using a canbus sniffer, I put the DSG through its gears while logging all of the can messages and then decoded them. These messages will then get coded into the microcontroller for broadcast, when requested.

I did not integrate the stability/traction control from the donor. I always had it turned off on my Exige anyway.

The coolant lines were very straight forward. Simply plumbed into the stock radiator lines. I already had a 2nd front radiator which I had connected to my rev400, which is now connected to an air/water intercooler for the turbo.

A lot of this project has been spent just educating myself on how the VW systems work. Fortunately I was already very familiar with the Lotus.
It was simply a puzzle to solve putting them together. Lots of testing and debugging. Fortunately I love problem solving :smile2:
I'd lose my mind going thru the VAG wiring, I did a kswap into a non-honda product and thought I was going to lose my mind, and that's simple to wire up.

You sir are a god among men.
 
Discussion starter · #68 · (Edited)
Finally received the buttons for the center console and tested out the canbus controller for the gear select. I still need to apply the gear select indicator decals on each of the buttons for P, R, N, D, S, M.
I hope to have all of the electrical cleaned up within the next few weeks, then on to the track for testing. Runs great on the street. Tons of torque in this motor. The DSG shifts are quick and smooth. Gonna be a fun ride...
 

Attachments

Finally received the buttons for the center console. Tested out the canbus controller for the gear select, and it works perfectly. I still need to apply the gear select indicator decals on each of the buttons for P, R, N, D, S, M.
I hope to have all of the electrical cleaned up within the next few weeks, then on to the track for testing. Runs great on the street. Tons of torque in this motor. The DSG shifts are quick and smooth. Gonna be a fun ride...
Congrats! That is amazing!
 
Discussion starter · #73 ·
She's DONE!!!!

Last night I put the final touches on her and took her out for about a 50 mile stint.
What an amazing ride. This motor is incredibly smooth as she revs up. Will take some getting used to as the redline is 7100 rpm and it revs so quickly.

In normal drive mode, the shifts are silky. In sport mode, it livens up the shifts a bit and holds gears longer. In manual mode, it is a BLAST! Quick up-shifts and crisp blips on downshifts. I am just amazed how smooth every is.

I will work to get my gopro up and running to try to get some on-board videos.

Another big thanks to Joe, Paulius, All the guys at New German Performance and APR. I couldn't have done this project without you all!

-David
.
.
 

Attachments

She's DONE!!!!

Last night I put the final touches on her and took her out for about a 50 mile stint.
What an amazing ride. This motor is incredibly smooth as she revs up. Will take some getting used to as the redline is 7100 rpm and it revs so quickly.

In normal drive mode, the shifts are silky. In sport mode, it livens up the shifts a bit and holds gears longer. In manual mode, it is a BLAST! Quick up-shifts and crisp blips on downshifts. I am just amazed how smooth every is.

I will work to get my gopro up and running to try to get some on-board videos.

Another big thanks to Joe, Paulius, All the guys at New German Performance and APR. I couldn't have done this project without you all!

Image


-David
.
.
But you didn't improve the rear visibility on the Exige! haha. :)
 
61 - 80 of 117 Posts