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 15 | Next
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
Posted by Sergio Savoy on 9th Dec 2013
I purchased the bypass valve and installed it myself. The full throttle hesitation the car had is gone and the boost the supercharger makes is allowed into the engine sooner - something you can feel when you don't downshift and punch it in traffic. Plus the extra oomph can be felt all over the power band. Overall this was a great purchase and the effects of the tuned valve are immediately felt.
Posted by Jerry S. on 24th Oct 2013
I was noticing my boost numbers were low and the car just didn't seem to pull as hard as other R53s that I know. I had my mechanic ziptie my OEM bypass valve closed and immediately noticed the difference. When we figured this out there wasn't any question if I was going OEM or DT. Now it's installed and it pulls just as well as the OEM one that was tied closed. I haven't noticed ANY negative side effects and the car PULLS HARD!!! I have owned this car for 3 years and it had always ran like that. It's like having a NEW car. Rest assured when the time comes to replace the one on my sons car it will be a DT bypas valve. Thank you Detroit Tuned!!!!
Posted by B on 26th Sep 2013
The product is exactly what it is described as. Fixed my yo-yo issue. took about hours. Be careful with the silacone house to the charge pipe
Posted by Matt on 30th Jul 2013
I started feeling throttle lag as my stock bpv began to fail. After switching to the Detroit tuned unit the throttle is better than ever before!!
Showing reviews 1-10 of 15 | Next