Detroit Tuned Bypass Valve

Detroit Tuned Bypass Valve

(50 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


50 Reviews

  • 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.

  • 5

    Posted by Michael Emistry on 21st Jun 2016

    Well I knew the BPV on my 05 r52 was a tad weak, not bad but it took a bit to build boost so I figured I'd give the DT BPV a try and I'll tell you what, boost hits hard now! Right at 2.5k rpm I'm slammed in my seat and I stay there through the pull. It gives a awesome sound when letting off to shift too, like a nice clean "pop" of air pressure being released almost like a pseudo blow off valve but quite. Well worth your money, a must do mod for any r52/r53!

  • 5
    works as advertised, how refreshing.

    Posted by Trevor Ward-Llewellyn on 18th Mar 2016

    This BPV closes quicker than my stock BPV which means more boost down low which means bigger smiles. That makes it worth my time and $.

  • 5
    Highly recommended

    Posted by Owen on 4th Jan 2016

    Excellent,ear to ear grin (Good Boost) car runs Excellent fixed Idle Problem

  • 5
    Ear to ear grins

    Posted by John on 7th Dec 2015

    Wow! A very noticeable difference in throttle response. I can really feel the difference at lower rpms, I now make full boost over the whole power curve. It pulls so much harder out of corners now.

  • 5
    The Forever Valve

    Posted by Unknown on 9th Nov 2015

    The stock valve in my '03 Cooper S was borked. Car ran like an asthmatic with pneumonia (I am an asthmatic and I had pneumonia more than once, so I know). It had no boost. The Detroit Tuned valve gave my MINI its lungs back. And I know it'll last practically forever with its reinforced spring and upgraded valve thingy. Awesome!