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  #1  
Old 04-24-2018, 05:50 PM
NY330iGary NY330iGary is offline
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M Performance Exhaust Operation - need education

There must be someone who can tell me how the MPE on my 335ix is supposed to work.
I had an MPE installed by the dealer, BMW part, before I took delivery. It is a CPO unit.

I have been trying to find someone who can definitively tell me how to get the left exhaust pipe to open up. The salesman didn't have a clue.

I don't believe that the left pipe flap has ever opened. I checked connections and things appear to be tight. I gleaned from older posts that the flap opens up when RPMs are greater than 3000 and the transmission is in Sport mode or Sport +. Otherwise it stays closed.

Can someone shed some light on how it's SUPPOSED to work?

Thanks

Gary
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  #2  
Old 04-24-2018, 08:26 PM
bimmerbingo bimmerbingo is offline
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Quote:
Originally Posted by NY330iGary View Post
I gleaned from older posts that the flap opens up when RPMs are greater than 3000 and the transmission is in Sport mode or Sport +. Otherwise it stays closed.
This.
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Old 04-24-2018, 09:25 PM
Hookster57 Hookster57 is offline
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I donít think the left side ever opens.


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  #4  
Old 04-24-2018, 10:45 PM
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Or you can code it to stay open all the time.
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  #5  
Old 04-25-2018, 05:32 AM
Our BMW Our BMW is offline
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Or disconnect it, add a jumper plug to make appear it's there software wise. Then open it manually and "pin it" to stay open.
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Old 04-25-2018, 06:13 AM
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CALWATERBOY TRE CALWATERBOY TRE is offline
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Quote:
Originally Posted by NY330iGary View Post
I gleaned from older posts that the flap opens up when RPMs are greater than 3000 and the transmission is in Sport mode or Sport +. Otherwise it stays closed.

You're getting it....that's how it's supposed to work.

Would there be a reason for that? Yep! Back pressure and sa-mooth engine operation; torque development @ lower rpm.

Does it ever open? Um.....yes.....but as you're prob driving at the time you don't notice.

Should you force open? No, but some do as it's noisier. Low end torque will suffer.
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Old 04-25-2018, 11:08 AM
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Quote:
Originally Posted by CALWATERBOY TRE View Post
You're getting it....that's how it's supposed to work.

Would there be a reason for that? Yep! Back pressure and sa-mooth engine operation; torque development @ lower rpm.

Does it ever open? Um.....yes.....but as you're prob driving at the time you don't notice.

Should you force open? No, but some do as it's noisier. Low end torque will suffer.
Seen this before, can you explain it?
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Old 04-25-2018, 06:51 PM
sweeney921 sweeney921 is offline
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Closing one of the exhaust tips does not increase torque. The back pressure argument is a flawed generalization. See below:



Keep in mind that turbocharged exhaust systems produce minimal scavenging effect, if any. This is because the turbo impeller interrupts the wave patterns within the exhaust system. The next best option is to increase the maximum flow rate, hence catless downpipes and larger diameter piping.

Last edited by sweeney921; 04-25-2018 at 07:10 PM.
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  #9  
Old 04-25-2018, 09:37 PM
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Quote:
Originally Posted by sweeney921 View Post
Closing one of the exhaust tips does not increase torque. The back pressure argument is a flawed generalization. See below:



Keep in mind that turbocharged exhaust systems produce minimal scavenging effect, if any. This is because the turbo impeller interrupts the wave patterns within the exhaust system. The next best option is to increase the maximum flow rate, hence catless downpipes and larger diameter piping.

Agree with this logic, but was wondering what makes people so often state the torque loss thing.
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  #10  
Old 04-26-2018, 07:02 AM
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CALWATERBOY TRE CALWATERBOY TRE is offline
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Quote:
Originally Posted by bear-avhistory View Post
Seen this before, can you explain it?

Well, the usual thing is that with better breathing [lower back pressure], more power is available. But BMW engines are tightly controlled and have an envelope of operation that allows only slight deviation from design spec. Reduce back pressure when the engine map is not designed to accommodate that, sub-optimal operation.

That was my experience when I did the 'golf tee' mod. What seemed at first to be smoother low end torque was simply reduced torque and when the exhaust flap was returned to normal op a pronounced increase in low rpm power appeared. I am persuaded by experience.
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  #11  
Old 04-26-2018, 08:19 AM
Our BMW Our BMW is offline
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Now if your experience was truly using a golf tee, then it was with an older model engine and possibly ECU mapping. As electronics and equipment have evolved so has the software. There might be different results now.
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Old 04-26-2018, 01:28 PM
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Quote:
Originally Posted by Our BMW View Post
Now if your experience was truly using a golf tee, then it was with an older model engine and possibly ECU mapping. As electronics and equipment have evolved so has the software. There might be different results now.
Yeah have to think about that or play with the coding & try to get performance measurements. Mine is coded open & the car is very strong out of the hole. Same with the 435.
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  #13  
Old 04-26-2018, 05:05 PM
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CALWATERBOY TRE CALWATERBOY TRE is offline
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Originally Posted by Our BMW View Post
Now if your experience was truly using a golf tee, then it was with an older model engine and possibly ECU mapping. As electronics and equipment have evolved so has the software. There might be different results now.
'09....but I'm surprised if ECU mapping accommodates outta spec exhaust flap op. If anything, specs are tighter.

But I gotta be honest....thinking on it, JB3 may have been installed.....coulda magnified the issue, maybe caused it. But, not motivated to check. Happy with JB4 now. Flap is in operation.
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  #14  
Old 07-29-2019, 07:18 PM
DrGadget DrGadget is offline
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MPPSK and Keeping Exhaust Flap open

I have the M Performance pack installed, but use Carly for BMW Pro (New Version) to keep the flap OPEN in all driving modes. I do a lot of freeway driving, so it helps with power and efficiency to do this -- particularly in Comfort Mode.



##########

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Last edited by DrGadget; 07-29-2019 at 07:19 PM.
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Old 07-31-2019, 09:04 AM
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Quote:
Originally Posted by Hookster57 View Post
I donít think the left side ever opens.


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I have exhast soot build up in the tailpipes on both sides, so I am quite confident the left side does open under the conditions already mentioned.
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Old 07-31-2019, 09:19 AM
Hookster57 Hookster57 is offline
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Of course youíll have soot on both sides. Iím saying when the M exhaust is popping itís only doing that on the right side.


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  #17  
Old 07-31-2019, 12:01 PM
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Can one of you exhaust conspiracy theorists explain to me why you think BMW bean counters - so tight that they would not even authorize felt flocking inside the dash cubbies on 2017 and 2018 5 Series - would sign on on paying for the valve, actuator, wiring, and programming if there wasn't a valid engineering reason for specc-ing them? Does anyone with a MPPK ever say, "Gosh, I feel like my car has 2 fewer horsepower today. That @#$%^&* exhaust flap must be closed again!" I know I've never had a complaint with the MPPK in our 340, and I'm amazed anyone here would.
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Old 07-31-2019, 02:54 PM
Hookster57 Hookster57 is offline
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M Performance Exhaust Operation - need education

When I paid extra for the MPPK I wasnít told that it (seems) to affect only one side of the exhaust.


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  #19  
Old 08-01-2019, 02:54 PM
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That's because it affects both sides. Always has. Always will.

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Old 08-01-2019, 04:03 PM
Hookster57 Hookster57 is offline
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Hey Quack, the left pipe sounds the same as the right? No, of course not.


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  #21  
Old 09-07-2019, 05:43 PM
DrGadget DrGadget is offline
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iCar Pro and OBD.Maven

In addition to using Carly for BMW, I also use an iCar Pro adapter (about AUD30/USD20) and the OBD.Maven app (free from Play Store).

The iCar Pro will connect using an Android or iOS smartphone/tablet and will use WiFi or Bluetooth. I use BT and it connects instantly. Moreover, I can add it as a trusted device to Smartlock .... meaning the connection stays live even if the phone's display is off.

Opening the rear exhaust flapper actuator valve is a one click operation.

No need to buy a dummy plug (BMW Part No. 18302411427) with the need to tie a piece of wire to hold the actuator in the open position once you have opened it electronically with the spring removed.
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Last edited by DrGadget; 09-07-2019 at 05:44 PM.
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