The Detroit Tuned Bypass Valve is a re-worked new OEM valve that is modified by Detroit Tuned to eliminate the "Yo-Yo" in early year ('02-'04) Cooper S's, but is available for all Gen 1 Cooper S's. 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.
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 @ 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.
Every valve comes with full how-to instructions (below) and all necessary hardware. Easy to install in about an hour. No core charge. This only fits the 2002-2006/7 Cooper S with the Tritech motor.
Showing reviews 1-10 of 19 | Next
Posted by David Moore on 6th Oct 2014
I own an 02 r53 with just over 60k original miles on it. The previous did some very nice upgrades to sc, ic, and suspension. While doing a supercharger service I notice the stock bpv was still on there. Wondering why the previous owner who dropped about 5 to 7k didn't ever think of changing that. Oh well! Recently did dtbpv, silicone intake hose, and silicone intercooler couplers. Holy crap what a difference. Certainly worth 125! Thanks
Posted by Corey Mcilveen on 23rd Sep 2014
Put this part on over the weekend and since I have noticed a smoother ride and an increase in 3 mpg on the freeway! For hot arizona this is huge! Would recommend to fellow 03 Mini Cooper s owners!
Posted by Jamie on 18th Sep 2014
The BPV is very easy to install and I did it in under an hour including cleaning the throttle body. I noticed an immediate change in the car. The power comes on sooner and harder than before. Great modification. It seems that fuel consumption is about the same as before.
Posted by Unknown on 11th Sep 2014
High quality parts are used that improve on the OEM design offering smoother and faster throttle response.
Posted by Tom on 4th Aug 2014
Noticed an immediate difference in throttle response and the way the engine pulls - a little stronger and much smoother. Recommend DT provide better instructions with some caution notes regarding removal of the original BP valve. You can damage the plastic bypass tube returning to the supercharger. That tube is a very poor design and will not withstand the motion needed to disconnect the original BP valve.
Posted by Unknown on 22nd Jul 2014
R&R'd valve in a little over an hour.
Normally aspirated side seems to function a little better. Pulls better, winds up a little faster.
Boost side kicks in sooner and stronger. Spools up fast! Not sure why it seems to be like a two stage deal, give or take about 5 lbs boost then up to 8-10 lbs and ultimately 11 lbs. I like it.
Posted by Jose on 1st Jul 2014
the Product has proformed, outstanding..
Posted by brian on 7th Mar 2014
Good customer service.
Posted by jason quarles. on 6th Mar 2014
Noticed a difference straight away. Quicker throttle response.
Posted by Unknown on 17th Dec 2013
I installed byepass valve straight forward by Detroit tune link work great no problems
Showing reviews 1-10 of 19 | Next