For the last 10 years, we have always had issues keeping our Pikes Peak Subaru WRX cool. We have tried a number of things to increase the cooling capacity of the car, and we have had some success, but the car always seemed to find a way to overheat.

Then we went to Super Lap Battle at Circuit of the Americas this year, and we couldn't even get a lap in before the car would overheat and push coolant out of the overflow. We spent that weekend trying to troubleshoot the issue, and found a lot of odd issues (we have one video out on this all ready, and we are going to dive into the final results of the engine teardown here soon). But what came from all of that is that a big part of our problem was likely to have been our radiator caps.

As we looked into the differences between the 1-way and 2-way radiator caps, we also found that a down-flow radiator (which all turbo Subaru's have had here in the states) are also prone to cooling issues on track as well.

Everything is starting to fall into place and it is starting to look like simpler is better, and the old ways are better than the new ones.

So we have made some changes to our cooling system, and this video is a discussion about why we have removed one of the caps.

Thanks for watching and Stay Tuned!

And here is a link to the Professional Awesome article mentioned in the video. It is well worth a read:

https://professionalawesome.com/how-t...