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Gear box oil temperature, obd, downforce

2K views 4 replies 4 participants last post by  DrPyro2k 
#1 ·
1) Did anyone logged the gearbox oil temperature in parallel with the engine oil temps (on a racetrack) ? This would be important for those who plan on tracking the car as the oil engine might be ok but the gearbox one can rise too much.
2) Is there any information about the car aerodynamics? What happens at higher speeds (like lift or down-force) ?
 
#3 ·
You have it on the dashboard. If you can see the gearbox temp via obd (bluetooth) then you can go a few laps until the engine oil goes towards 120 grd and see what happens with the gearbox oil.
If it goes up for example to 110 grd then on every track day it would be enough to have a look on the oil temperature in the dashboard and estimate how high the gearbox oil temperature is.
 
#4 ·
I did see some aero info a while back but can't remember where I saw it. The car does have some downforce front and rear in stock form. You have to be careful as the car is pretty balanced in that regard and you shouldn't only fiddle with one end without doing something on the other end. For instance putting only a big rear spoiler with nothing in the front will cause more understeer......front aerodynamics tweaks will move it towards over oversteer.

I have a LE coupe which has the vents just forward of the front tires. That will reduce front end lift a bit at speed compared to the non LE cars. If you look through the front grill and at the area near the radiator mount you will note the sheet metal angle there is actually acting a bit as a front spoiler. The car has a full belly pan and you will note a splitter under the rear of the car (two plastic fins). Even the "cam back" (sharp cut off rear end) is a good aero design trick too.

I have a friend who is head of the wind tunnel of GM here in Detroit. He said he 4C has quite advanced aero design. There is enough down force designed in that at high speed the car will run into a "wall"....where the power to overcome that drag and downforce will impact top speed a bit. That is a good design engineering wise as cornering is much more useful than sheer top speed.
 
#5 ·
The only information you can via the CAN port on the OBDII connector via AiM or Racelogic is Engine Coolant Temperature (at this time). I believe that you would have to add the sensors or specific code to get engine oil temperature and gear oil temperature. On my recent HPDE weekend where the temperature was 90+ with high humidity, I had engine coolant temperatures in the range of 230F.
 
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