Yost Autosport BMW E92 M3

The Ultimate Endurance Racing Machine

Endurance racing – the ultimate test of man and machine working together. Competing against other teams, the elements, and numerous unexpected variables in order to survive the grueling battle against the clock. Sometimes these endurance races last 4-6 hours, maybe even twelve. If your willpower matches your skillset, and the preparation of your vehicle is on par with the best in motorsports, you step it up to a race that last more than a full day – The 25 Hours of Thunderhill.

Enter Team Yost Autosport, a group of 5 men who over the past 3 years have built one of the best amateur BMW race cars in the USA. What you’re seeing here is their BMW E92m3 endurance race car. Now before going any further, I want to make clear that I’m using the word “amateur” loosely. I use this term because these gentlemen are not getting paid to compete, but do it for the love of motorsports. However, the car they have built is as far from amateur as you can get. This rendition of “The Ultimate Driving Machine” is as professional, high end, and a “no-cut corners” type build as you can achieve.


No expense was spared when building the Yost Autosport E92 m3 racecar. Cutting edge technology from front to back

CSF was introduced to Yost Autosport at the beginning of 2014 to help cool and keep under control the known heating issues of the S65 engine in the E9x m3 vehicle platform. CSF 1st introduced back in summer 2014 the engine oil cooler for the E9x M3, alongside R&D partners VF Engineering

Pic 3 - e9x oil cooler

The CSF x VF Engineering engine oil cooler for the BMW E9x M3 platform

Pic 4 - e9x-m3-oil-cooler-1 vs. OEM

The highly durable and robust stacked bar&plate style CSF oil cooler (back) versus the smaller OEM tube/fin design (front)

After introducing the engine oil cooler to the market, a plan was formed to develop 3 other specific coolers for the vehicle; Radiator, power-steering cooler, and transmission cooler. The goal was to work with Yost Autosport to test-fit the design of the coolers, and then use their vehicle as the ultimate testing-bed for the performance and durability of the parts before they were released to market.

Pic 5 - ps cooler

CSF’s dual-pass CAB-brazed power steering cooler. This replaces the OEM mechanical-style cooler for a 40% increase in cooling efficiency. Featuring a unique design that retains the “drop-in fit” ethos of CSF!

Pic 6 trans cooler e9x m3

CSF’s dual-pass CAB-brazed transmission oil cooler. This cooler uses CSF’s special high-pressure micro-tube technology with 4 channels. The OEM cooler uses a slightly thinner tube with only 2 channels. A 29 % increase in cooling efficiency. This cooler is for both 6speed & DCT transmissions. It also fits the BMW E90 335 as the engine oil cooler with a drop-in fit, requiring no modifications to install.

Pic 7

CSF’s triple-pass all-aluminum radiator is a superior upgrade to the stock plastic/aluminum radiator in the vehicle. The CSF unit features a 42mm 2-row core with CSF’s exclusive B-Tube Technology. This all adds up to a ~20%+ increase in efficiency, and the ability to dissipate heat much faster than the OEM unit.

By retaining all the brackets, shrouds, fittings, and “quick-connect” hoses, it not only allowed CSF to install all 4 parts on the fully built Yost Autosport M3, but also allowed us to hit the street, occasional track, and repair market with a “drop-in fit” solution that had been tested in a 25 hour endurance racer!

Pic 8

CSF’s triple-pass all-aluminum radiator behind the “drop-in fit” power-steering cooler upgrade

I’m not going to lie, I was very excited, but also feeling nervous before the start of the 25 Hour of Thunderhill race in December 2014. CSF was testing a prototype set of parts on a car that was going to be racing for 25 hours. We did not want to be the reason the car did not complete the race, or the reason it wasn’t able to compete at it’s highest level.

Pic 9

The Yost Autosport M3 engine bay – a sight to behold!

So much effort and time has gone into this build. Not just by the core team behind Yost Autosport, but also by all of their supporting manufacturers, vendors, and media supporters as well.


The Yost Autosport M3 sitting on air jacks in front of the CSF booth at Bimmerfest 2015

CSF is very proud to be a technical partner to Team Yost Autosport. They managed to finish the 25 hour race in 2014, and came very close to ending the 2015 season with another completion as well. Unfortunately, this past year, it just wasn’t in the cards to finish the race due to a mechanical failure.


The Yost Autosport M3

They’ll be coming back even stronger this year with the purchase of a new BMW M4 that will surely be a show-stopper. A great platform for them to build another leading BMW racecar. CSF is looking forward to being on board as the cooling partner of the new Yost Autosport race car, and using it to develop new and exciting cooling products for the F80 platform of the new M3 & M4

Make sure to check out all the articles from our marketing partners below!

MotoIQ.com just released a full testing feature on our 4-piece track-spec cooling system for the BMW E9x M3 platform.


Check out the full feature on Speedhunters by the great Larry Chen

Pic 2

Larry Chen is a master behind the camera. Make sure to check the article out on Speedhunters!

Go all the way back to the beginning of this project with our tech partners at MotoIQ.com – written by Yost Autosport’s very own Mike Bonanni

Part 1 – September, 2013 – Voiding the Warranty
Part 2 – March, 2014 – Why Do We Have All of These Extra Bolts?
Part 3 – March, 2014 – It’s the Little Things
Part 4 – July, 2015 – Let’s do some catching up
Part 5 – August, 2015 – Basic Aerodynamics
Part 6 – October, 2015 – Roll, Stop, & Stick

Then head over to the BC Racing website to read Mike’s recap post from this past year’s race at the 25 Hour of Thunderhill

BC Racing even put this great video together recapping this past December’s race of Yost Autosport’s experience at the 25 Hours of Thunderhill Race

Yost Autosport at the 25 Hours of Thunderhill from BC RACING NA on Vimeo.

For more info on CSF’s BMW cooling products, including all 4 items found on the Yost Autosport E92 M3 – check out our BMW product page

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