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Cooling the Performance Model 3 On Track – An Overview of Our Modified Heat Exchangers


Mar 2, 2018
Toronto, Canada
This has been incredible testing and work by @MasterC17, I can't tell you how much of a joy it is to work with like-minded people. These lockdowns really limited the amount of development we could do on various different types of cars, but working with guys like Chris remotely was a fun challenge and it was amazing how productive we could be even thousands of kilometers apart!

@Dolemite - The oil cooler fan can be controlled in a number of ways, either with a temperature switch in the provided 1/8" NPT port, using a switch in the trunk, or with a more complicated controller. We decided not to include anything in the kit because it would push the price a bit too high for such a low volume product, but we did make a nice affordable solid state relay in an aluminum housing that means you don't need ugly fuses or big switches. The Model 3 has no fuses so we didn't want to give anyone a reason to need to add any!

Our suggestion is to connect a switch to the Solid State Relay and turn it on when you want the cooling - either when precooling for the track or when going to the track. You can also use a heavier duty switch and not need the Solid State Relay at all, as the wire from the amplifier is already protected by the OEM power distribution module.

We'll have more specific instructions on the SSR in the coming weeks.

A thermal switch doesn't work very well unfortunately because all of the switches we could get our hands on are designed for gasoline engine temperatures - so the fan wouldn't come on until the system was already too hot!

The other thing about temp switches, if you're supercharging and not going to the track you might not want the fan to come on, so a "dumb" thermal switch won't really be able to know your intentions. The MoTeC C125 or any other CAN-based controller with a digital/aux output can be programmed to turn on the solid-state relay, and that is really the ideal way to set it up. So when you're in track mode, or when the Cooling Party Controller is on, the fan would automatically turn on.

@MarcG - The first 10 oil cooler kits are done and ready to ship other than some back-ordered Aeroquip fittings to assemble the hoses. They are out of stock USA-wide so we're just waiting on those patiently... I figure it's pretty cold in the USA so we aren't too worried about this, however if it looks like the fittings won't come in soon we'll make the decision to either switch hose options (which I really don't want to do as we're using really nice motorsport hoses and fittings made in the USA), or for those that are in a rush you can reach out to us and we can work something out without the hoses. In any event, it shouldn't be long for the oil cooler!

There are a few other bits as well, as Chris mentioned the oil cooler alone doesn't buy you a huge amount of additional run time, but with the CPC and the oil cooler you would certainly have more run time by precooling, as generally speaking it takes a lot of effort to get the car cool between sessions if you come off the track hot and go straight to charging. It's especially bad if you Supercharge between sessions.

There is more coming as well for the hardcore guys.


Active Member
Dec 3, 2015
Exciting! Can’t wait to see the finished product.
What’s the installation complexity expected to look like?

It will require some special tools, but it is DIY-able. I would figure about 3 hours for the rear oil cooler, which you don't really need any special tools for. The front oil cooler will take roughly the same. The radiator will probably be more of a 4 hour job, and will require special tools for bleeding the coolant (vacuum bleed is required). The modification in the penthouse would require HV awareness and insulating gloves, tools, etc, but would probably be the quickest to do.

I'm looking to start offering installation services later this year, incase anyone is not comfortable doing it themselves!


Supporting Member
Nov 10, 2019
I like my approach with oil radiators invisible even though they are 2x in the rear and 5x larger in the front. I also like that there is zero oil flow through radiators if I switched them off. It's not for free, though - parts alone cost 4k.

Need to do something with a front coolant radiator. Just oil coolers are not enough - coolant temperatures climbing up faster than I'd like. I just don't know how to avoid losing frunk weather sealing...

Very interesting what is that you hack in the battery and if it works.
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