Stock BMW E90 engine bay

2007–2011 BMW E90 335I/135I Performance Aluminum Radiator, Part 3: Prototype Test Fitting

Interested in purchasing this E90 radiator? Check out our product page for more information!

BMW 335i/135i Performance Aluminum Radiator

Test-fitting day! After scouring local forums and maxing out our contact list, we were finally able to locate a 335i owner willing to lend us his vehicle for the day.

Mishimoto E90 radiator prototype and test vehicle
Mishimoto E90 radiator prototype and test vehicle

Peering into this engine bay reveals … well, not much really. Shrouding and the upper radiator support hide the radiator almost completely. The entire package is mounted fairly far forward in the vehicle, and the best glimpse when fully installed is of the radiator hose connections. Check out a few shots of the stock radiator still installed.

Stock BMW E90 engine bay
Stock BMW E90 engine bay
BMW E90 upper radiator hose connection
BMW E90 upper radiator hose connection
BMW E90 fan shroud
BMW E90 fan shroud

Once we developed a game-plan for the day, our engineers set about removing the stock radiator. The “book time” for replacement is just under two hours for this radiator, which is slightly longer than most, but not terribly so. I would recommend giving yourself a weekend morning to take your time, being sure to remove things carefully. Plastic components become fragile with years of constant temperature variation. It is quite a scene when that hose you are leaning on suddenly bursts and coolant sprays all over your pants. For those of you completing a full cooling system refresh, you have a bit of a longer day ahead of you!

Once we installed the Mishimoto prototype radiator, we were very pleased with the overall fitment. The mounting points matched up and the shroud bolted to the radiator perfectly. We also found that the thickness selected was essentially spot-on and created a nice cushion for component movement. Although difficult to show, check out a few installed shots!

Mishimoto E90 prototype radiator installed
Mishimoto E90 prototype radiator installed
Mishimoto E90 prototype radiator quick disconnect inlet
Mishimoto E90 prototype radiator quick disconnect inlet
Mishimoto E90 prototype radiator fitment with shroud
Mishimoto E90 prototype radiator fitment with shroud

Although the test fit went very well, we had a few areas we wanted to improve. First, the upper corner of the radiator on the driver’s side was a bit of a tight fit and required some tweaking to mount perfectly. We would be adjusting our design to amend this. The second correction we planned to make was to the upper inlet. We saw a small amount of restriction in flow with our current design, so we decided to modify the mounting to the tank to alleviate this. Otherwise, we can consider this a very successful test fit.

Our next update will include our final product testing and data collection. Keep an eye out for this in the next few weeks!

Feel free to follow up with any comments or questions!

Thanks

Interested in purchasing this E90 radiator? Check out our product page for more information!

BMW 335i/135i Performance Aluminum Radiator

9 thoughts on “2007–2011 BMW E90 335I/135I Performance Aluminum Radiator, Part 3: Prototype Test Fitting”

  1. I would love to try this on my e90 NA 328I N52. I have been looking for a performance radiator since I moved to AZ. I use to have a 06 k20z3 and had your mishimoto aluminum radiator and I loved it!!! Im pretty familiar with the swap out process, I work full time but if you guys need some help testing on my specific model I would be more than happy to start a diy thread on e90post. Cooling is very important part that ppl overlook even non turbo cars. I am pinoye90 on e90post and just completed a thread on afe performance race pipe which is why now they are on backorder because of the thread I started. I would be honored to do the same with your products.

    1. Hello Mahdi,

      Thanks for the comment, and for reading our article. Unfortunately it appears as though our radiator is not going to fit the NA models. Looking at both units next to each other reveals several differences that are very likely to cause fitment issues, especially with the tight tolerances on this model.

      We certainly appreciate the offer for test fitting. If we are able to confirm fitment, we will be in touch!

      Thanks
      John

    1. Hello Paulo,
      The blue E90 you see used during our testing was equipped with a manual transmission. At this time, this radiator is designed for vehicles with a manual transmission only. For automatic models, the transmission cooler utilizes the base of the radiator to perform liquid-to-liquid heat exchange duties. Let me know if you have any additional questions!
      Thanks
      -John

    2. Im pretty sure the 335i and the 328i e90 MT HAVE the same fitment for the raidiator but the 328i AT version will not fit. Let us know asap

      1. Hello,

        Great question! The radiator for the turbo and non-turbo models are extremely similar. According to OEM part numbers, they are different components. To 100% confirm fitment we would need to install our aluminum counterpart in a N52 powered vehicle. We will attempt to track down a test vehicle for fitment verification!

        Thanks for the heads-up!
        -John

  2. Thanks a lot John,
    you are the first one to give cristal clear tech response. I hope in the future Mishimoto develops a Rad for the BMW auto trans.

    Thank you.

    Paulo

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