Hi guys
I had to try the car some more now. And found a few week points (possible improvements).
First I tried some 201m drag racing. After 7 rounds I ended up with a broken gear box. The gear box used was a 722.634 from 270CDI so I was aware that it would be at risk. So I bought a 722.636 from E55 AMG and transferred the bell housing.
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After the gear box change it was time for some 402m drag racing. Unfortunately not to many rounds that day. Was anyway able to find things that have to be improved.
*Gearbox is not aggressive enough when gearbox oil gets warm. Could notice from the logg-file that gear changes was slower and slower as temperature increase. Hopefully this can be sorted out by adjusting the temperature compensation in the gearbox controller.
*Converter is to tight. I'm not able to spool the turbo, when putting the gearbox in D, holding the brakes and full throttle I get a stall speed of 2500rpm. This is not enough to build any boost. During these last two tests I instead put the gearbox in N, used launch control 5500rpm and 1.5bar of boost and shift to D. This caused the rear wheels to spin uncontrolled for some time. Causing really bad 60-feet time.
*Intercooler is not functioning properly. On the 402m run I could see the manifold temperature increase drastically. After about 1/3 of the run intake temperature is 60 degrees. After about 2/3 of the run intake temperature is about 70 degrees. When exceeding 70 degrees about 7-8 degrees of injection timing have already been removed by the ECU (safety function). So this is really something that has to be sorted out in order to get down the track quicker.
Building a new inter cooler is the biggest job of the three point. New tube and fin core is already ordered, hopefully I can find the time to build it within a couple of weeks.
Converter is sent for readjustment (this is still a mystery to me so I don't try it myself).
Adjustment of the gearbox I suppose/hope we can do on the highway.
Take care until next time!