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      04-18-2017, 11:38 AM   #1
futureal33
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Decat just fitted to 340i f31... Awesome!

Just had a 4" de-cat downpipe fitted and been to collect the car.
Absolutely fantastic, really pleased with it!

Quite a bit louder on cold startup... Then pretty similar to stock at idle...
In comfort it's about 20% louder than stock when taking it easy, a bit deeper sounding but not boomy and no drone.
In sport.... Wow. Totally different sound completely.

I haven't heard the mppsk in person but all the videos I've heard sound very similar to this!

I also experienced the "gunshots" I've heard people talking about... And while I also hate them being described as gunshots, as it sounds ridiculous, the sound is actually really well summed up by this title!!

Haven't taken it above 5000 yet but will do soon to realise the top end performance gains feeling!
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      04-18-2017, 03:50 PM   #2
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Come back with a video, how is the smell?
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      04-18-2017, 05:54 PM   #3
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Did you get catless downpipe or did you decat your stock pipes?
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      04-19-2017, 01:19 AM   #4
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Quick video - will do something better soon



There's a slight smell when sat at traffic lights and the engine running. Its not bad - it certainly wouldn't make me want to take it off and put a cat back in - the smell isnt over-bearing, it just noticeable.
I actually quite like the smell, it smells like a petrol forecourt.

This is a catless downpipe!

So far so good, really like the noise. It works exactly how I wanted it to... it isnt loud ALL the time, its noisy when you want it to be, and slightly louder than stock at all other times. Idle sounds very stock-ish.
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      04-19-2017, 07:58 AM   #5
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Ok so are we saying a catless downpipe + JB+ pretty much gives you MPPSK for say around $500 ?
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      04-19-2017, 08:10 AM   #6
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Quote:
Originally Posted by futureal33 View Post
Quick video - will do something better soon



There's a slight smell when sat at traffic lights and the engine running. Its not bad - it certainly wouldn't make me want to take it off and put a cat back in - the smell isnt over-bearing, it just noticeable.
I actually quite like the smell, it smells like a petrol forecourt.

This is a catless downpipe!

So far so good, really like the noise. It works exactly how I wanted it to... it isnt loud ALL the time, its noisy when you want it to be, and slightly louder than stock at all other times. Idle sounds very stock-ish.
Are you running JB4 as well? If so, which map?
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      04-20-2017, 03:17 AM   #7
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I've got no JB or tuning - car is 100% stock apart from the DP
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      04-20-2017, 09:22 AM   #8
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Can I just say how envious I am of you having an F31 340i? I would LOVE to have that here in the states
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      04-20-2017, 01:26 PM   #9
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Quote:
Originally Posted by insanecoder View Post
Ok so are we saying a catless downpipe + JB+ pretty much gives you MPPSK for say around $500 ?
JB+ on its own will give you more performance than the MPPSK
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      04-23-2017, 02:22 AM   #10
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Quote:
Originally Posted by insanecoder View Post
Ok so are we saying a catless downpipe + JB+ pretty much gives you MPPSK for say around $500 ?
No. MPPSK properly increases DME load target. JB+ tricks the DME into thinking you're running stock boost when you're running more and relies on fuel trims to get your fuel right, PID to get the boost control right and knock detection for ignition timing. Also MPPSK reports more correct torque to the TCU. The MPPSK is a way less dodgy option if you're running pump fuel.

With a little ethanol chucked in to handle the timing, a JB+ could be an OK option while waiting for flash tuning availability if fuel trims still have room to move.
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      04-23-2017, 02:53 AM   #11
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      04-26-2017, 12:02 PM   #12
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Quote:
Originally Posted by bradsm87 View Post
No. MPPSK properly increases DME load target. JB+ tricks the DME into thinking you're running stock boost when you're running more and relies on fuel trims to get your fuel right, PID to get the boost control right and knock detection for ignition timing. Also MPPSK reports more correct torque to the TCU. The MPPSK is a way less dodgy option if you're running pump fuel.

With a little ethanol chucked in to handle the timing, a JB+ could be an OK option while waiting for flash tuning availability if fuel trims still have room to move.
How much E85 would you recommend running per tank on map 2? I'm assuming no additional mods would be required to supplement with E85?
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      04-26-2017, 12:28 PM   #13
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Quote:
Originally Posted by blckz06 View Post
How much E85 would you recommend running per tank on map 2? I'm assuming no additional mods would be required to supplement with E85?
Depends what you mix it with. I wouldnt do more than 12gal of 93 and 3gal of ethanol but thats me.
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      04-28-2017, 12:00 AM   #14
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Quote:
Originally Posted by blckz06 View Post
How much E85 would you recommend running per tank on map 2? I'm assuming no additional mods would be required to supplement with E85?
I would not run map 2. I'd run MPPSK with 85% 93oct and 15% E85 and I'd ask Terry for a custom JB4 firmware that doesn't modify the IAT signal to the DME and run map 1. That way, you get good reported torque, fairly close to DME boost target (so better fuel trims) and fairly aggressive timing.

Last edited by bradsm87; 04-28-2017 at 12:11 AM..
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      04-28-2017, 07:55 AM   #15
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Sounds nothing like the MPPSK... This video sounds like a rice burner... MPPSK is throaty, deep - and much louder under acceleration. The down shifts are mostly burbles with once ins a while pops (which only come at the higher RPM).

MPPSK sounds like a GTR with exhaust but at a lower volume... closest I can compare to.

Quote:
Originally Posted by blckz06 View Post
Are you running JB4 as well? If so, which map?
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      04-28-2017, 08:53 PM   #16
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Sorry, can you expand on this? I thought that JB4 map 2 was specifically created for cars running downpipe. Terry / team are saying that's what I should be running, so I'm a bit confused by your statement.

Also, upon further research, I'm planning to just supplement with Torco. Seems like the easiest way to bump up octane level by a few notches to ensure that timing doesn't get pulled. Any cons to that vs. supplementing with E85?

Quote:
Originally Posted by bradsm87 View Post
I would not run map 2. I'd run MPPSK with 85% 93oct and 15% E85 and I'd ask Terry for a custom JB4 firmware that doesn't modify the IAT signal to the DME and run map 1. That way, you get good reported torque, fairly close to DME boost target (so better fuel trims) and fairly aggressive timing.
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      04-28-2017, 09:29 PM   #17
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Torco leaves residue on plugs and has a tendency to foul them, it's not something to run often especially on a high compression turbo engine.
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      04-29-2017, 12:49 AM   #18
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Quote:
Originally Posted by blckz06 View Post
Sorry, can you expand on this? I thought that JB4 map 2 was specifically created for cars running downpipe. Terry / team are saying that's what I should be running, so I'm a bit confused by your statement.
MPPSK is the only option to get the DME itself to know it's making more torque. Map 2 tricks the DME into thinking it's running stock boost when it's actually running much more. This cuts down heaps on the safety margin, the fuel trim range, that the DME has for adjusting fuel. JB4 also tricks the DME into thinking it's running hotter intake air temp. This does have some useful side effects (slightly higher DME boost target and less timing) but it would no doubt have many unknown side effects. Also when the DME thinks it's running stock boost and it's actually running much more, it's still reporting stock torque to the transmission computer, causing it to not shift as well as it would if it was being reported the actual torque.

MPPSK + Map 1 would allow you to run similar boost to stock + map 2, but with less dodgyness. Better boost control, better timing and fuel, better torque reported to the TCU.
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      04-29-2017, 08:44 PM   #19
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I see - really appreciate the explanation.

Doesn't map 1 also trick the DME into thinking it's running stock boost (with map 2 just increasing boost further)? Just trying to get it straight in my head.

Last question - I'm installing catless downpipe and intake as well. Would you still recommend I add a bit of E85 in the tank when running the car harder that usual (for additional safety net?) even when only running map 1 or would that only be needed on map 2?

Thanks a lot for your help!

Quote:
Originally Posted by bradsm87 View Post
MPPSK is the only option to get the DME itself to know it's making more torque. Map 2 tricks the DME into thinking it's running stock boost when it's actually running much more. This cuts down heaps on the safety margin, the fuel trim range, that the DME has for adjusting fuel. JB4 also tricks the DME into thinking it's running hotter intake air temp. This does have some useful side effects (slightly higher DME boost target and less timing) but it would no doubt have many unknown side effects. Also when the DME thinks it's running stock boost and it's actually running much more, it's still reporting stock torque to the transmission computer, causing it to not shift as well as it would if it was being reported the actual torque.

MPPSK + Map 1 would allow you to run similar boost to stock + map 2, but with less dodgyness. Better boost control, better timing and fuel, better torque reported to the TCU.
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      04-29-2017, 11:51 PM   #20
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Quote:
Originally Posted by cptcrunch View Post
Can I just say how envious I am of you having an F31 340i? I would LOVE to have that here in the states
THIS!
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      05-01-2017, 12:56 PM   #21
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Map 1 increases boost but it does more than just boost - the other sensors, timing etc. are in play to deliver smooth delivery. (not sure how it compares with or without MPPSK)

Map 2 has more aggressive timing and reduces boost from map 1 but creates more power if you run higher octane. However, Map 2 is still in beta and doesnt recommend as a daily driver. It is good for those who have 93 octane. He does NOT recommend E85 at all in the B58 motor under any circumstance. He has never gone into much detail other than this motor doesnt like it and should be avoided (Unlike the N55 motor). He recommends going to meth for the added performance.

Things may have changed but in summary above is what Terry stated in the N54 forums a while back. You can go and find the posts to confirm my statements.



Quote:
Originally Posted by blckz06 View Post
I see - really appreciate the explanation.

Doesn't map 1 also trick the DME into thinking it's running stock boost (with map 2 just increasing boost further)? Just trying to get it straight in my head.

Last question - I'm installing catless downpipe and intake as well. Would you still recommend I add a bit of E85 in the tank when running the car harder that usual (for additional safety net?) even when only running map 1 or would that only be needed on map 2?

Thanks a lot for your help!
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      05-01-2017, 04:52 PM   #22
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but on B58 fuel flap it says E85 10% can be used !
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