Detroit Tuned Bypass Valve

Detroit Tuned Bypass Valve

(74 reviews) Write a Review
1.00 LBS
$12.99 (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 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 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 W11 Tritech motor.

Instructions Download



74 Reviews

  • 5
    DT bypass valve

    Posted by Jay on 23rd Jun 2020

    Your product was way better than I expected and your service and shipping was outstanding Thank You

  • 5
    DT Bypass Valve

    Posted by Justin Z on 9th Jun 2020

    I love this part by Detroit Tuned. Car boosts so much harder with this valve installed. Definitely a great update if you're looking to get all the power you possibly can out of your r53. Detroit Tuned is very professional and I look forward to doing more business with this fantastic American company.

  • 5
    Detroit tuned bypass valve

    Posted by Jim on 3rd May 2020

    Part arrived quickly and was an easy install, made a difference and car pulls hard now with immediate boost

  • 5
    R53 Boost Bypass Valve

    Posted by Joe McGlohen on 11th Apr 2020

    Excellent product. Exceeded my expectations on the Butterfly fit and return spring. Thank You!

  • 5
    R53 Boost Bypass Valve

    Posted by Joe McGlohen on 10th Apr 2020

    Quality exceeded my expectations. The butterfly seal was absolute, and the stronger return spring is amazing. I hope to try it out tomorrow!

  • 5
    Bypass valve

    Posted by on 2nd Jan 2020

    so much better than stock, at over 100k miles this is a must! construction and function are just as described!

  • 5
    Bypass valve

    Posted by Mike Stalling on 3rd Dec 2019

    I have a 16% pulley and my boost gauge showed max 10psi boost. Pulled the original bypass valve and I could see light all around the opening and the spring was weak. Installed the DT bypass valve and I now have almost instant boost and it maxes at 15 - 16psi. It made a huge difference. I definitely recommend.

  • 5

    Posted by CHARLES DUCKWORTH on 9th Aug 2019


  • 5
    2006 mini by pass valve

    Posted by Frank Rufano on 22nd May 2019

    After about a week of daily driving noticed a big difference in performance,and more importantly no EML or engine lights on,goes yo show you u can't go cheap with mini parts,highly reccomend.

  • 4
    Pain in the ass

    Posted by Tommy on 15th May 2019

    The directions are good, but the bypass valve hose on my 05 was hard as a rock. That made it very difficult to get the supercharger intake off. Go ahead and order a new hose with this upgrade. You will take off the inter cooler, reveal the spark plugs, access the fuel injectors, and mess with the intake tube for the air intake, so consider pairing this process with upgrades on any of the above.

  • 5
    Detroit Tuned BPV

    Posted by Michael Rolland on 29th Apr 2019

    Very good purchase make sure you have no vacuum leaks but after that was solved I definitely noticed a better throttle response. Feels like the car woke up feels like she pulls a bit harder! Did notice a little less mpg but very little. Love it! Highly recommend if you have an upgraded SC pulley and the few other bolt ons! Yo-yo is gone!

  • 5
    Works great

    Posted by Nick sampson on 8th Apr 2019

    I've got a 2006 mini cooper s jcw that had a bad "yo yo" effect and boost loss. Buying this bypass valve fixed the issue and restored the lost boost I had.