I am sure this has been on here, but I can't find anything directly comparing or saying if the DT BPV is really actually better than the OEM one.

Discuss =]

 

+ 1 i think its just a stiffer spring in the dt. I think ima buy an oem one tomorrow

 

Spring and the butterfly valve is adjusted so it operates correctly.

 

Worth the extra loot?

Or just get a new OEM one?

Oh, and does anyone know where I can buy the OEM one online?
Thanks.

 

Depends on if the OEM one is working correctly. If you are not experiencing any problems then don't worry about it.

You can get OEM parts from several dealers with discounts, Classic MINI and Morristown MINI are the most suggested.

 

Well I am only hitting 10 PSI boost, and I have been told by several people I should be hitting 15.

So I was deciding if I should just get a new OEM or go ahead and get the DT BPV?

 

Depending on your miles it could be
1. Your bypass valve is not function correctly
2. boots to the inter-cooler is leaking. They do get dry and brittle due to expose to oil/heat/ozone etc.
3. your supercharger is worn
One common cause of rapid supercharger wear that is not discussed to often is that a lot of the silicone intake hoses are installed incorrectly and they slip off....it is hard to get the hose clamp around it when you install them....and they are designed to be trimmed so that they fix the correct way. Many people rush....then the hose slips off....and the engine sucks dirty air in. But if you are getting close too 100,000 miles on the supercharger.....you can bet it has lost quite a bit of efficiency.

I'd look around before spending the money.....some love the tighter spring on the Detroit unit....some don't...depends on your driving style.
Good luck!!!

 

i have a DT BPV and love it. Im not sure how the OEM one feels because mine was broken! but the DT one is only about 20 bucks more, so id say why not.

 

I read here it only added 1 PSI difference compared to the OEM BPV.

 

only adds 1 PSI... depending on mods that a nice increase. 1 PSI for 20 bucks more is better then OEM.

 

A properly adjusted OEM valve will make the same boost as DT. It seems like the other main reason for changing is to help the yo-yo that you feel when transitioning from on to off boost. The stiffer valve will be less likely to slam open and shut repeatedly in these transitions. Unfortunately, it also looks like the stiffer spring makes boost sooner which reduces gas mileage.

 

But sooner boost at the lower RPM would mean more power at lower RPM right?

 

That's not really how it works. Sooner boost means you don't have to put your foot down as far to go from bypass to boost. If you floor it, at a given rpm, any properly adjusted bypass valve will yield the same amount of boost. Even the stock valve starts going into boost during mild acceleration. The transition zone (for those who don't have a boost gauge) is when you hear a sort of whistle.

 

+1

 

Someone should go into more detail on what the tighter spring exactly does.

I am a nub with these things.

Also, describe what is meant by "yo-yo effect."


Thanks for all the comments and help!
I will check to see if all my stuff is installed properly and whatnot, I also really should clean my air filter.

I hope my supercharger isn't just worn =/
I have just under 80K miles.

 

I recommend that you just buy the modified BPV from Detroit Motors. http://www.detroittuned.com/shop/?productID=179

Yes, it is worth it. You want to try an OEM? At the time, I checked two dealers and out of 10 samples, 8 did not seal well, so this is a very common problem with the 02-05 S models.

I am the one who found the problem and then recommended to one of the founders of Detroit Tuned to include this modification with the spring that he was experimenting on at the time. I have the first BVP that he sold that incorporated the spring and the correctly sealing BPV.



Use a wire to secure the lines at the ends to insure seal while on boost.

Want to check your BVP? Make sure that you remove the BVP and use a light behind the BPV to see how well it seals. It must not allow any light to pass. Be careful, the screws are made of brass and can be damaged very easily.


You will have a perfectly fine running MINI S with this problem. You are loosing boost when the BVP engages at 2800 RPM, but it does not affect the operation of the engine, only the boost.



The YO-YO is not completely fixed with this mod. You have to do the VGS mod to completely fix it. Also, do not forget to reset your computer every once in a while and drive like a maniac immediately after, then turn off the engine. Look around the old posts. There is a lot of good information in this site.



Good luck.

 

I installed the Detroit BPV on my car and it pretty much took the yo-yo effect away. Its been probably 6 months and the problem is slowly returning. Going to try the VGS mod to help smooth it out for good. When you take the oem one off the difference is easily noticable. The detroit feels way more solid then the oem one. Becareful where you buy it from. It says it comes with instructions, but mine was def not shipped with instructions.

In summary, well worth the money, but also do the VGS.

 

Not everyone needs the VGS mod. I had it on my '06 MCS for about nine months and took it back off. I never really had the Yo-Yo effect until I made the mod. The benefit I miss is the instant slam-shut of the BPV when you floor it, which made boost come in quicker. The side effect was it took some work to properly start out from idle in 1st gear.

You need to read through the entire thread to find out who had what effects as a result of making the VGS mod, not making it, and those who took it back off (like me).

https://www.northamericanmotoring.co...?highlight=vgs

 

With the Detroit BPV, Boost comes on way early also using more gas. I also have a sprint booster installed and when I just touch the gas, I'm in boost. Lots of gas but lots of fun.

 

Bought the DT BPV last week and installed it today. It boosts up quickly after pushing the throttle like half pedal, similar to how the VGS mod functioned. And no other yo-yo side effects (which is uncommon but did occur when I had the VGS mod installed). It's like a whole new MINI again.