c6_a6_novi

I've been trying to find what the range of temps for C6 LS3 Z51 A6 is normal, and haven't found any good data yet - anyone on here know?

Background: I have an ECS Novi SC (stage 1) on '09 Z51 A6 coupe, and doing a track day last year, on 3rd 1/2 hour session some trans fluid came out. No problem or leak was found, the shop thought it had gotten hot and overflowed. I just installed a DeWitts radiator (which also has higher capacity trans cooler built in). During a shake-down cruise in 55 deg temp, the coolant stayed ~185, oil ~210, and trans fluid ~208 - does this seem like a normal range? What temp range should I start to worry?

Any ideas on a separate trans coolers if required?

Thanks

PCMusicGuy

I have 145k on my A6 (2007) and long term data for me is this:

- Commuting, on the interstate or highways, the temperature stabilizes at 176 degrees in anywhere from 75 to 100 degree ambient temperature.
- Spirited driving, lots of shifting, higher than usual RPM, the temperature will easily go over 210 degrees in the same ambient temperatures from above. The temperature will never get below about 195 again even if I do 60 mph with no shifts for the next 2 hours.
- Stop and go traffic, the temperature will see over 220 on 95+ degree day. The highest I've ever seen on my transmission was 232.

In general, I would say if you are seeing temperatures of under 220, you are probably good. If you are consistently getting hotter than that, you might want to think about adding an external/additional cooler.

mikeCsix

Should be + or - 20 from engine temp when fully warmed.

ls1wolf

HOXXOH

For proper operation and longevity, the temps ideally should range from 160 to 190. GM chose to use engine coolant to control the trans temps, so the expected results will have a range from 190 to 205, assuming coolant temps remain in the same range and trans use is normal and fully warmed up. Temporary excursions up to 240 are not enough to do damage, but you can get in trouble at higher temps for longer periods. Shifting is also negatively affected at temps below the 150-160 range, especially at or near WOT.

There is no thermostatic control on trans fluid and none can be added, since the pump to circulate fluid is not a full flow pressure system. If you tend to see temps exceeding 200 on a regular basis along with high coolant temps, an external cooler plumbed after the radiator cooler will help. If the engine coolant is in the normal range, but the trans temps are high, plumb an external cooler prior to the radiator cooler. The size and location of an external cooler will make a difference, just as much as the ambient temperature and driving conditions does. There is no one-size-fits-all.