Thanks for the mentions guys.
Angel,
High tranny temp warning is very common for the Z06 on the track (not auto-x). I got one my very first DE. Warning comes in at about 274-277F or so.
Problem with the C5 and C5 Z06 is that the tranny and diff are in the back of the car, tucked in between the exhaust and muffler, they are bolted together, they hold relatively little fluid, there is little cooling airflow there, and the car has no tranny or diff cooler. This all equates to lots of heat in and little heat out.
Tranny and diff cooler really is not necessary for an auto-x. For a track event, the decision you have to make is whether a cooler is worth it given the tradeoff of bumping you up into another class at auto-x events. You always have the option of pulling in and letting the tranny cool down at a track day event.
At the temps you are seeing, even good synthetics like AMSOIL don't last forever. I have a tranny cooler and I still change my tranny and diff fluid about every fourth track weekend or so. I use
AMSOIL ATF for the tranny (which meets GM Dexron III standards for the Z06 manual) and
AMSOIL Severe Gear Extreme Pressure Synthetic 75w90 for the diff. If you change these yourself, having something like this will be required to pump the fluids up into the diff and tranny:
AMSOIL Hand Pump. Finally, the AMSOIL Severe Gear 75w90 comes with friction modifier in it and adding extra is not normally needed. Some guys do add a bottle of friction modifier such as the
AMSOIL Slip-Lock Differential Additive to prevent differential chatter, but I've never needed to do that in my diff.
As for brakes, I am currently using Wilwood EXP 600 Plus which has a very high wet and dry boiling point. Note that this fluid doesn't meet OEM specs. I also suggest you upgrade to track pads. I race on Carbotechs and think these pads are the best, but also very reasonably priced. I race on XP11 front and XP10 rear on R compound track tires such as the Kumho V710. You might start at XP10 front, XP8 rear if you are on stock tires. These pads are carried by forum vendor pfyc.com.
What track did you run at, Heartland Park?
