[Cobra1956]

Making a little progress on my heating issues and would like to get this all sorted and move on to the tune. Tracked last friday and two weeks before that when I installed the smaller DCT cooler and mounted it a bit farther away from the back of the radiator. As for the heat exchanger, I had just plumbed in the first cooler with hose barbs, great idea unless you need to get it out of there. So I cut the cooler out and I removed the exit hose from the heat exchanger and cut the remaining oem hose off the fitting with a dremel. What you have left is a fitting that works with .5 inch hose or dash 8 and a somewhat quick disconnect. While its apart you can change out the o ring inside the fitting. NAPA has various sizes and can usually provide what is needed.


I still worry about coolant temps and I did see as high as 235 on the mechanical gauge. If I run the defrost cycle on the car the temps dropped to just below 230. In BMW world that may be okay but my car is not producing enough power so I know there will be more heat to address down the road. The came with a tune from MHD and they have 3 different cooling setting so I think that addresses water pump speed. Since BMW is picking up temps from the oil system, my thoughts are that adding the second oil cooler tricks the ecu into thinking things are cool enough. Would love to get under 220 if possible. Will be back at the track Thursday and plan to get the car smoke tested to check for any leaks and then tune to @350 hp. Should be fine for the weight of the car and I think with the few bolt ons the car came with I can safely go to around 400.

Here is a screen shot of the temp information I found when scrounging the web for ideas on the cooling. None of this has been confirmed so your results may very.


I do have about 15 track days left for this year so I hope to get all this sorted by the time the car comes back home.