on the other day I was driving around in my 159 and it did some not-so-funny things... firstly it didn't build boost at all... that was cured with a restart... I blame the 40C weather to be honest, car has been fine ever since.
The other was a bit more frightening... when I put it in reverse it made a horrendous, violent and pretty loud clunking noise... or I would rather say a f*cking big "BANG". I had sat in cars with dying auto trannies before, and this was waaay more violent. I was afraid to put in R again. All forward gears were perfectly fine. Grabbed my laptop and MES, and checked the oil temp. It was a whopping 112C, which is way too high for normal driving conditions! Usually it stays around 95C. Again I blame the 40C heat and a rubbish stock cooler.
Has anybody installed an external tranny cooler on this cars? I believe that would a be a great preventative mod to the tranny. Not sure about the UK guys, but here we have unbelievably hot summers. Also eying with Autolusso's engine oil cooler kit...
Changing the transmission cooler would be a huge job on Q-Tronic and would need some development and probably a CNC machine. The gearbox does not have an oil/air cooler but oil/water heat exchanger that is hooked on engine coolant circuit, actually located on the hoses that are passing EGR cooler as well. The heat exchanger is made by KTM and sits on the front part of the transmission:
Q-tronic cooler 02.jpg Photo by gotcha147 | Photobucket
To modify it you would need to manufacture a pickup plate that would be bolted on the transmission precisely instead of the heat exchanger, all the piping and air cooler in the front of the car.
This all can be of course done, but other problem is that you can not make any thermostatic regulation of the oil temperature. The Aisin heat exchange is full flow exchanger, this means all the volume of oil from the pump in the gearbox flows via the heat exchanger. So if you replace it with big cooler, you can not regulate the flow at all as you would be blocking the pressure of oil in the gearbox and blocking the pump. In hot summer you would get lower temperatures of gearbox oil, right, but in winter at -10 degrees you would also still have full oil flow via the cooler and you can not block it or regulate so your gearbox temp would be always too low in winter.
I think 112 deg is not too much for the gearbox oil. Its cooled by engine coolant that is normally around 90 degrees, so when driving the car in summer you can never expect gearbox to be under 90 as that is the cooling medium tempearture. Actually its pretty good system, as in winter the coolant heats up the gearbox oil to get up to temperature faster and in summer it cools it down so compared to air cooler it maintains the gearbox temperature in a relatively small range both at -20 or +40 outside.
I would start with oil replacement with your Q-Tronic. Its the cheapest and easiest thing to do if you have starting issues. It might help you but its of course not guaranteed, its anyway the only thing you can really do without having the gearbox removed and rebuild by a professional.
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Last edited by gotcha; 14-08-15 at 07:53.