Detroit Tuned Bypass Valve

Detroit Tuned Bypass Valve

(55 reviews) Write a Review
4.00 LBS
$9.99 (Fixed Shipping Cost)

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 your 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 tired 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 Tritech motor.

Instructions Download


55 Reviews

  • 5
    MCS 05 - Happy Customer

    Posted by Ian - MCS 05 on 13th Jan 2018

    With 95k miles on my MiNI, and a list of mods done. Still seemed a little slow off the line. So I installed the DBV, and I very happy, runs like new.......and it feels alive! Well worth the time and money. I do a lot of research, and have to say, I glad I bought it :D

  • 5
    Bypass valve

    Posted by Adam Hulmes on 8th Dec 2017

    A must for any R53 running a reduced pully. My car feels more urgent and for a little more money than a stock one it's a no brainer! Also came with a free koozie and bottle opener, How cool is that!!!! I will definitely be making Detroit tuned my first go to for all my R53 needs.

  • 5

    Posted by on 23rd Oct 2017

    Low cost, easy install, improved performance, BAM!

  • 5

    Posted by Unknown on 16th Oct 2017

    It's crazy how one little part made a huge

  • 5

    Posted by Unknown on 22nd Apr 2017

    Great service. Ordered this online and it was ready for pickup very quick for a Saturday! Got rid of the "yo yo" at part throttle. Only put a few miles on it but works good so far.

  • 5

    Posted by Unknown on 19th Feb 2017

    My car only has 50k on it, after changing the bypass valve it was a world of difference car run better and stronger then ever.

  • 5
    Biggest Bang for the Buck.

    Posted by John R Leaman III on 20th Jan 2017

    I have a Detroit tuned in my GP and now in my wife's MCS. Awsume accelleration from this valve.

  • 5
    Mini runs strong now

    Posted by Jacob Larsen on 3rd Oct 2016

    Great product. At 110,000 miles it was time to upgrade. I was getting the dreaded 1237 code and power loss. Bolted up this bypass valve, erased the code and am happy to report the car is faster with no codes.
    Thank you

  • 5
    By pass valve!

    Posted by John R Leaman III on 9th Sep 2016

    Nice product! Car seems much quicker on the throttle.