cbuzzetti wrote:


- Higher elevations have thin dry air
- Driving nose-to-tail with no airflow to the radiator
- Sitting in grid or impound
- In case additional cooling is needed for hot days or other variables

Weston wrote:


Fans make almost no difference when moving but we often sit in impound or on grid and that is where the car has potential to run hot.

I don't see in the rules you are required to have fans in the car - just that if you do they have to be oem (whole structure).

This is a very cheap way to allow our cars to run cooler when the car isn't moving. It should not add any performance advantage and if we can delete the fans altogether then it will make no difference at all - just help with reliability of the car which is important.

Seems reasonable if we're having fairly frequent trouble with the stock fans. We'll add it to the list of considerations for the 2010 rules.

jaje wrote:


The wussy fans from the early cars don't, but the much higher CFM ones from the later cars can make a noticeable difference on track. I only have one of the good fans on my car, and experience has repeatedly shown that there's no doubt that it helps. Not so much on the straights, but mostly when in corners or in traffic. A lot of us up here in Colorado still run hot though, even with the fans on.

don't be fooled by the hype of aftermarket fans, they are the wimps, OE fans far exceed them and shrouds pull air from all corners of the rad. late six blade units are better of course and drop in. It would take 7 $20 pancake fans to come even close! BTDT

Todd

One of the thing the Az guys did many years ago was to cut the center bar out of the spoiler. This helps airflow to the radiator and is allowed by rules. Look at a front end shot of my car to see this.


Remember we run in temps of over 100 degrees in May and September so cooling is an concern for is. The other nice thing is that external oil coolers allow the water temp to run lower since that heat is not going into the radiator.

I do run the later 6 blade fans direcly wired to the battery and each on their own switch. This allows me to better determine what fans I want to use when.