Engine start with open exhaust valve in a MY18

[Kimeran]

MY18 ZCP owner here
On my car it does have a slight bark then its a quiet cold start with efficiency mode on.
Very noticeable when doing it in Sport+ though. It's loud throughout the cold start process.
It is now a habit to follow this process EVERY TIME that I start the car...
So now I'm excited to pull those fuses out then I don't need to worry about it

[NPuter]

Originally Posted by KZEVO

Very interesting information. Did not know this was different between ZCP and non-ZCP. I thought early morning cold start was loud in my non ZCP with MPE. Wait till Neighbors wake up to my 5am cold starts in the ZCP with MPE

Just want to reiterate that the last part of that post is incorrect. While ZCP does behave differently in that the car always starts with the valves open for a second, if you switch to S/S+ and tap the accelerator before starting, they will not close after the start like they normally do.

[Bch53211]

Originally Posted by gmorton995

One thing many are missing above is that you have to blip the throttle after moving the throttle mapping to Sport/Sport Plus prior to starting the engine. Only then will the flaps open. They do NOT open without a blip of the throttle. So....

1) click start engine without holding brakes
2) place throttle mapping in Sport/Sport Plus
3) blip throttle a couple of times
4) you MAY hear the valve opening
5) start engine
6) loud start-up and the way it should sound...enjoy

This DOES work for MY18 ZCP contrary to a lot of misinformation found across the forums. Not sure where that originated/why it originated...

Strange - just followed this procedure on my 18 CP and noticed no difference whatsoever

[Champagne_Reign]

keep in SP b4 u crank engine. my starts open every time

[Kimeran]

So I tried pulling fuses 146 & 147 on my car, MY18 M3 ZCP, and it made no difference.
Valves still open and close. I can hear the usual difference in sound between efficiency and sport.

[Bch53211]

Originally Posted by Champagne_Reign

keep in SP b4 u crank engine. my starts open every time

Ok was in just sport not sport plus, will try that. Like others have said there is the slight bark at start up but quiets down right away and haven’t ever noticed the dramatic sound described .

[chetman7]

I have a 2017 m3 non zip

My valves are open once I start the car for at least 20-30 seconds no matter the mode I am in.

From the sounds of this thread ..this isn't the norn?
Maybe previous owner tuned it in?

[jzmundy]

Lots of confusion in this thread around all the different startup scenarios and variables dictating them.

Cold start vs. warm
Valves open vs. closed
ZCP vs. non-ZCP
MY vs. MY

As a reference point, my 2017 ZCP will NOT open valves before start in sport or sport plus. You may start the car, THEN blip in sport or sport plus to open valves. Doesn't matter whether cold or warm start. This has been reported elsewhere on the forum as typical behavior for at least the MY2017 ZCPs. It is my understanding that this behavior is not necessarily consistent with prior MY base or ZCP cars.

[jzmundy]

Originally Posted by chetman7

I have a 2017 m3 non zip

My valves are open once I start the car for at least 20-30 seconds no matter the mode I am in.

From the sounds of this thread ..this isn't the norn?
Maybe previous owner tuned it in?

I suspect what you're describing is the cold start and is a normal process programmed to get the cats to operating temp as quickly as possible.

[NPuter]

Originally Posted by jzmundy

Lots of confusion in this thread around all the different startup scenarios and variables dictating them.

Cold start vs. warm
Valves open vs. closed
ZCP vs. non-ZCP
MY vs. MY

As a reference point, my 2017 ZCP will NOT open valves before start in sport or sport plus. You may start the car, THEN blip in sport or sport plus to open valves. Doesn't matter whether cold or warm start. This has been reported elsewhere on the forum as typical behavior for at least the MY2017 ZCPs. It is my understanding that this behavior is not necessarily consistent with prior MY base or ZCP cars.

Interesting. So even if you put the engine into S/S+ and blip the throttle before starting the engine, your valves still close immediately after start? If so, that must be a difference between '17 and '18 ZCP.
With my '18 ZCP, if do the above, my valves stay open after start.

[jzmundy]

Originally Posted by NPuter

Interesting. So even if you put the engine into S/S+ and blip the throttle before starting the engine, your valves still close immediately after start? If so, that must be a difference between '17 and '18 ZCP.
With my '18 ZCP, if do the above, my valves stay open after start.

Correct! Maybe is a MY17 quirk. AFAIK, previous years' models behave as you describe as well (unsure if it's dependent on ZCP or not for MY16s).

[backagain]

Originally Posted by chetman7

I have a 2017 m3 non zip

My valves are open once I start the car for at least 20-30 seconds no matter the mode I am in.

From the sounds of this thread ..this isn't the norn?
Maybe previous owner tuned it in?

Check under the trunk bed to see if fuses 146/147 are missing. Another possibility is whether the valve controller plugs are unplugged.

[paliknight]

How does this change with a ZCP with the MPE

[Kimeran]

Originally Posted by jzmundy

Lots of confusion in this thread around all the different startup scenarios and variables dictating them.

Cold start vs. warm
Valves open vs. closed
ZCP vs. non-ZCP
MY vs. MY

As a reference point, my 2017 ZCP will NOT open valves before start in sport or sport plus. You may start the car, THEN blip in sport or sport plus to open valves. Doesn't matter whether cold or warm start. This has been reported elsewhere on the forum as typical behavior for at least the MY2017 ZCPs. It is my understanding that this behavior is not necessarily consistent with prior MY base or ZCP cars.

Have you pressed the throttle after putting it in sport mode and before starting the car?

[jzmundy]

Originally Posted by Kimeran

Have you pressed the throttle after putting it in sport mode and before starting the car?

Yes, both in sport and sport+. It has no effect.

[shay2nak]

Maybe it depends on how you press the throttle. Do you tap it or press all the way down. I tapped it then started the car. It sounded louder, but got quieter after a few seconds. '18 m3 zcp.

[Bombora]

I have a 17 build and I cant hear the valves open, but can hear them close. I have checked and the do open when start ignition when I press sport/sport plus. It's very loud.

[NPuter]

Originally Posted by shay2nak

Maybe it depends on how you press the throttle. Do you tap it or press all the way down. I tapped it then started the car. It sounded louder, but got quieter after a few seconds. '18 m3 zcp.

I only need to tap it after setting S/S+

[Bombora]

My 17 does open valves when tapping throttle before start in sport/+. Much louder on start up that normal

[tropicalypso]

Originally Posted by paliknight

How does this change with a ZCP with the MPE

I can’t speak for a ZCP, but the cold start + valves open on my M3 with the MPE makes mothers hide their children.

[Bch53211]

Originally Posted by Champagne_Reign

keep in SP b4 u crank engine. my starts open every time

Tried SP and I notice the difference - kind of addicted to it now

[Spritztour]

Originally Posted by asuh1991

That should work....

To even dumb it down more,
1)click start engine without holding brakes
2)click m2(saved as sport plus everything)
3)you should hear the valve opening
4)start car
5)super loud and obnoxious, I don't do it anymore.

I still do it at work in garage once in a while and have the car alarms go crazy.