Quote:
Originally Posted by Shipkiller
VMZ432,
I do not understand your comment that 'the Z4M does not have enough cooling capacity for the track'?
If you say this with regards to having a SC I would have to agree looking at the data that everyone else has posted, since I do not have a SC.
I would disagree if you are talking about a stockish (not SC) engine. Just my personal experience over the last three or four years on the track with this car says you are incorrect. I have been on the track in 100’ ambient temps and my oil temperature has never been above 225. If the temperature is less than 100’ the oil temps always hover around 220. This past weekend at the track, the ambient temp was 95’ and my oil temps never climbed above 205, but I am using a different weight oil now also which allows my engine to run a tad bit cooler all the time now. Even on the street.
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It definitely does not have enough cooling capacity for SC applications especially the radiator system. To confound the issue those running an intercooler now have it disrupting flow to part of the radiator and a large oil cooler in front of it as well. The stock coolant system just can't handle that on track (water temps in the red within 3 hot laps on a 90 degree day.
Stock it really is variable , but depends on the track and most importantly the drivers skill level. I had no problems NA at Roebling Road (Momentum track with a long straight), but did run hot at CMP (lots of braking/ turns and acceleration).
The bottom line is to truly track a car hard in hot conditions cooling modifications are always useful . The Z4M for an OEM car is set up well for occasional track use but once you reach an advanced skill level it is not enough on many tracks.