Detroit Tuned Bypass Valve

Detroit Tuned Bypass Valve

(7 reviews) Write a Review
1.00 LBS
Calculated at Checkout

The Detroit Tuned Bypass Valve is a re-worked new OEM valve that is modified by Detroit Tuned to eliminate the "Yo-Yo" in the MINI Cooper S's, the yo-yo was more prevalent for the early 2002-2004 cars but could happen in any of the years. What is the "Yo-Yo" effect? It's the opening and closing of the valve around 2500 rpm's so that it feels like you're stepping on and off the gas, but you're not. So we added a stronger spring to overcome the vacuum condition that it sees so that it will not open as soon or as much. Our BPV closes at 6" of vacuum, as opposed to the factory value of 0" of vacuum. MINI tried to fix the problem in the 2005-2006 cars with a ECU tweak but it never really worked correctly for a lot of cars. This was the main reason our BPV was created, but there are a lot of benefits, read on!

The DT BPV uses a stiffer return spring, resulting in quicker boost generation, and thus quicker throttle response and transitions. Most cars see about 1psi total more boost @ redline. The butterfly assembly is also adjusted as much as possible to close fully, allowing for maximum boost. This is done by centering of the butterfly door and adjustment of the set screw that sets the openness of the butterfly. Perfect for the aggressive driver or racer. It is possible to see a very minor loss in fuel economy, but you will see a great improvement in throttle resolution and smoothness.

Full how-to instructions (below) and all necessary hardware is included. Easy to install in about an hour. No core charge so there is no need to return your old valve. This part only fits the Gen 1 2002-2006/7 Cooper S with the W11 Tritech motor.

Instructions Download


7 Reviews

  • 5
    Throttle Response

    Posted by Benjamin Mohn on 21st May 2024

    Car is much peppier!

  • 5

    Posted by Sam T. on 23rd Apr 2024

    I've been struggling with the "yoyoing" and unstable idling for awhile. This made such a night and day different. Definitely worth the money

  • 5
    Detroit Tuned Bypass Valve

    Posted by Rich R on 22nd Feb 2024

    works great!

  • 5
    God bless you for the included #28 hose clamp

    Posted by Paul Weinzimmer on 30th Sep 2023

    Great little upgrade. I was able to do the driveway install with the instructions provided on the product page. Thanks for that!

  • 5
    Detroit Tuned R53 Bypass Valve

    Posted by Paul on 11th Oct 2022

    Worth every penny. I have an '05 MCS, which some people will tell you doesn't need a replaced bypass valve. After smoke testing the original bypass valve It very clearly had a leak, and was yo-yoing in second and third gear between 3100 RPMs and 5000 RPMs.
    I ordered and installed Detroit tuned bypass valve, for the R53, which took about 45 minutes to put in (And I am definitely not a mechanic).
    Results? Yoyo effect is completely gone. Overall compression has greatly improved in all gears. It drives like a completely different car from yesterday. Thank you Detroit Tuned. I'd be glad to write a review anywhere else you'd like one. A great part and a great price, making a great result.

  • 5
    Did the trick!

    Posted by Andrew on 1st Feb 2022

    Solved my 2006 R53 yo-yo @ 3/4 throttle and more boost earlier! Great communication from the Detroit Tuned team as well. Perfect!

  • 5
    Diverter valve

    Posted by Brian on 9th Sep 2021

    Valve worked exactly how described. Service was exceptional the girls in the office are outstanding. Will be doing lots of business with this company in the future;)