07-22-2017, 01:31 PM | #1 |
New Member
21
Rep 15
Posts |
Exhaust @ cold start
Apologies in advance to the many who have taken time to post on the various Exhaust threads but I'm looking for relatively basic info.
My M2 sounds great on cold startup but something changes around 20-30 seconds after startup. Placing in Sport + mode doesn't seem to make a difference. My question is whether there is a way to keep the cold startup sound 20-30 seconds after startup. I am running a stock exhaust system. Thanks. |
07-22-2017, 01:48 PM | #2 |
Lieutenant
375
Rep 507
Posts |
No, that is the engine cold starting and as the idle dies down the sound goes away. I guess you could unlock the ECU and have the idle rpm changed and fueling, but realistically just get an exhaust or downpipe. I'll sell you my GThaus exhaust. It's nasty all the time lol.
__________________
Present: 21 M2C 6MT/Ford something
Past: M2 Mineral Grey 6MT Past: BMW e30 m52 turbo 628whp/558wtq |
Appreciate
0
|
07-22-2017, 01:49 PM | #3 | |
Lieutenant
436
Rep 571
Posts |
Quote:
There is no way you can keep that sound after the engine and exhaust begin to heat up and expand . fuel will be reduced into the cylinders as the car warms and normal service will resume. |
|
Appreciate
0
|
07-22-2017, 01:54 PM | #4 |
New Member
21
Rep 15
Posts |
Understand but the change I'm hearing is a not gradual change but a distinct step change like a valve is opening or closing - about 20-30 seconds after a cold start.
|
Appreciate
0
|
07-22-2017, 02:01 PM | #5 |
Lieutenant
436
Rep 571
Posts |
I have the MPE perf exhaust and can't hear much until after 10 seconds. The only thing I can think are the valve lifters, is to do with helping catalytic convertor heat up cycle.
|
Appreciate
0
|
07-22-2017, 05:33 PM | #6 |
I INDIC8
612
Rep 1,286
Posts
Drives: 2018 LBB M2, 6MT
Join Date: Dec 2016
Location: Cleveland, OH
|
Secondary air injection. it's for emissions. heats the cat quicker.
__________________
2004 Matrix XRS 6MT => 2008 VW R32 DSG => 2012 Audi TTRS 6MT => 2018 BMW ///M2 6MT
I'm an IT guy by trade and tech nerd by choice. I like HPDEs, parts of US Hwy 129, NC 28, and the Cherohala Skyway. I'm also a fan of aural pleasure. |
Appreciate
0
|
07-22-2017, 08:01 PM | #8 |
First Lieutenant
211
Rep 360
Posts |
The missus is complaining that when the M2 starts up in the garage, which shares a wall with the kitchen where we hang all our cooking utensils, everything is clanging and vibrating. It's going to be mad as hell when I get the M Performance exhaust installed
|
Appreciate
0
|
07-22-2017, 09:40 PM | #9 | |
Moderator
29419
Rep 13,107
Posts |
Quote:
__________________
///M is art ↔ Artemis
|
|
Appreciate
0
|
07-24-2017, 04:29 PM | #10 |
Brigadier General
4185
Rep 3,077
Posts
Drives: 991.2 Porsche GT3, BMW E46 M3
Join Date: Jul 2016
Location: Sunshine State
iTrader: (5)
Garage List 1987 BMW 325is [10.00]
2004 BMW X3 [6.50] 2018 Porsche 911 GT3 [10.00] 1974 BMW 2002tii [10.00] 2004 BMW M3 [10.00] |
__________________
Follow me on IG
Garage: 2018 991.2 GT3|2013 135i|2004 M3|2004 X3|1987 325is|1987 325i|1974 2002tii |
Appreciate
0
|
07-24-2017, 06:04 PM | #11 | |
BimmerPost Supporting Vendor
24199
Rep 190,807
Posts |
Quote:
You can get an upgraded exhaust system for a more aggressive sound
__________________
Check out our current sale by clicking on this link!
https://x-ph.com/sale/ Phone number 702-494-9435 |
|
Appreciate
0
|
07-24-2017, 06:50 PM | #12 | |
Second Lieutenant
115
Rep 256
Posts |
Quote:
Also during the cold start, the engine automatically revs higher in idle, again to bring up the temp quickly |
|
Appreciate
0
|
07-24-2017, 07:05 PM | #13 | |
Captain
538
Rep 752
Posts |
Quote:
|
|
Appreciate
0
|
07-24-2017, 07:08 PM | #14 | ||
Second Lieutenant
115
Rep 256
Posts |
Quote:
Whenever I cold start my m135i, I always get exhaust fog out of one side. Then after a minute both sides open? |
||
Appreciate
1
JustChris17489.00 |
07-24-2017, 07:15 PM | #15 |
Captain
538
Rep 752
Posts |
|
Appreciate
0
|
07-31-2017, 11:43 AM | #16 |
Never underestimate the Home-Bowl
484
Rep 821
Posts
Drives: F87 M2<E92 M3<E46 M3
Join Date: Jul 2011
Location: UK
iTrader: (0)
Garage List 2017 BMW M2 [0.00]
2016 BMW M235i [0.00] 2012 BMW 120d M Spo ... [0.00] 2010 BMW M3 - SOLD [10.00] 2002 BMW Z3 2.2i Sport [0.00] 2001 BMW M3 - SOLD [9.00] |
Just happened to do a video of my completely stock car. Something that's quite rare on YT.
It's interesting how great it sounds, but sound deadening kills most of it off for the driver.
__________________
2017 F87 M2, MG, M-DCT
2002 E36/7 Z3 2.2 Sport 5MT 2016 F22 M235i Coupe, MW, ZF8 |
07-31-2017, 12:09 PM | #17 |
this is the way
18155
Rep 8,527
Posts |
What exhaust tips do you have? From the cameras angle they appear to be slanted and look black. Exhaust sounds great outside the car!
|
Appreciate
0
|
07-31-2017, 01:00 PM | #18 | |
Never underestimate the Home-Bowl
484
Rep 821
Posts
Drives: F87 M2<E92 M3<E46 M3
Join Date: Jul 2011
Location: UK
iTrader: (0)
Garage List 2017 BMW M2 [0.00]
2016 BMW M235i [0.00] 2012 BMW 120d M Spo ... [0.00] 2010 BMW M3 - SOLD [10.00] 2002 BMW Z3 2.2i Sport [0.00] 2001 BMW M3 - SOLD [9.00] |
Quote:
Car is filthy in the video, but I was;t trying to win a concours...!
__________________
2017 F87 M2, MG, M-DCT
2002 E36/7 Z3 2.2 Sport 5MT 2016 F22 M235i Coupe, MW, ZF8 |
|
Appreciate
1
Tag18155.00 |
07-31-2017, 01:24 PM | #19 |
this is the way
18155
Rep 8,527
Posts |
|
Appreciate
0
|
07-31-2017, 02:03 PM | #20 |
;)
587
Rep 898
Posts |
Cold start has the waste gates full open to bypass the turbo in order to heat up the cats quicker as it runs real rich.
Probably also helps the turbos as the oil is still thick so the bearings don’t spin too much. That said, if you guys really want a loud startup the new v61.4 ISTEP seems to have the ZCP/GTS startup mode in it sounds meaaaaan! |
Appreciate
2
JustChris17489.00 MerlinPurple688.50 |
08-01-2017, 08:39 AM | #21 |
Private First Class
24
Rep 115
Posts |
I can hear the flaps opening and closing?? Is this in comfort??
__________________
Current garage F87 DCT KW-HAS, and F20 N20. Previous E92 N54 FBO 100%-E85, E90 N52, E46, E21.
|
Appreciate
0
|
08-01-2017, 11:15 AM | #22 |
Never underestimate the Home-Bowl
484
Rep 821
Posts
Drives: F87 M2<E92 M3<E46 M3
Join Date: Jul 2011
Location: UK
iTrader: (0)
Garage List 2017 BMW M2 [0.00]
2016 BMW M235i [0.00] 2012 BMW 120d M Spo ... [0.00] 2010 BMW M3 - SOLD [10.00] 2002 BMW Z3 2.2i Sport [0.00] 2001 BMW M3 - SOLD [9.00] |
Nope. Started in Traction, then mid way through it's in Sport+. No comfort allowed in my car.
__________________
2017 F87 M2, MG, M-DCT
2002 E36/7 Z3 2.2 Sport 5MT 2016 F22 M235i Coupe, MW, ZF8 |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|