GTM Motorsports Oil Cooler

Denny McLain

Thanks for the information. Very informative and useful .

Water Temps......... The first time I dynoed my 370Z it sat 30-45 minutes with the hood closed going on the dyno. After the first pull it sat 30 minutes with the hood open and a fan on it. It gained 10 hp on the second pass. My opinion at the time was that it was heat soak which is common on numerous cars. The SVO Mustang is famous for losing as much as 60 hp when they get hot vs cold. The opposite is LSx engines which usually make the best hp on the third pull and don't seem to mind running a little hotter.

After getting the Cobb AccessPort and logging my timing, I've noticed the car pulls more timing out when it get hotter. Logged two runs with one at 184 water temp and the other after a couple of passes @ 207 degree water temps. The car pulled out 2 degrees of timing.

Now I'm not so sure about my original assumption of heat soak as reduced timing certainly will kill hp but there is a definite 370Z horsepower loss association with heat. The reason for the oil cooler for me was frankly to see if the oil temps were a factor. I'll repeat the logging and add the oil temps into the formula to see what the timing does.

My current feeling is the cars will make more usable power if they run cooler. If you read David Vissards book, he notes that small block Chevy's sweat spot for hp is 170 degree water temps. Hotter factory temps are usually done for emmissions and engine longevity.

I'm sure sooner or later someone will come out with a thermostat and I'll do my thing logging the timing to see what it does and also more dyno time.