Cold Start Tune

[MSport]

Has anyone successfully reduced cold start noise with BM3? I love the exhaust once warm, but start up is a riot.

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[razorlab]

Has anyone successfully reduced cold start noise with BM3? I love the exhaust once warm, but start up is a riot.

Map Configuration --> Catalytic Heating (Cold Start) --> Off

I would only do this if you no longer have a cat.

 

[MSport]

Map Configuration --> Catalytic Heating (Cold Start) --> Off

I would only do this if you no longer have a cat.

Not on hi-flow?

 

[razorlab]

Not on hi-flow?

YMMV

 

[OldHead-MKV-Owner]

I'm in the opposite group. I have an AA catted dp, on bm3 E50 ots, cat heat on oem, and mine no longer has the high rev heat up cycle.

The 93 map on oem does. Weird shit. When I get the custom tune we'll fix this.

 

[suptj]

I'm in the opposite group. I have an AA catted dp, on bm3 E50 ots, cat heat on oem, and mine no longer has the high rev heat up cycle.

The 93 map on oem does. Weird shit. When I get the custom tune we'll fix this.

Make sure you select your desired start up/settings in map config before flashing. You have to do this every time before you flash. It's map specific so the settings don't carry over to others. Its very common and easily overlooked.

In your case:
Select map -> Map Config (in the top right corner) -> Catalytic Heating (Cold Start) -> On.
Those who have catless usually turn it off.

 

[OldHead-MKV-Owner]

Make sure you select your desired start up/settings in map config before flashing. You have to do this every time before you flash. It's map specific so the settings don't carry over to others. Its very common and easily overlooked.

In your case:
Select map -> Map Config (in the top right corner) -> Catalytic Heating (Cold Start) -> On.
Those who have catless usually turn it off.

Thanks man. Yeah, I was able to figure that out. Have "customized" 3 OTS maps and 2 of them (93 / E50) I've changed settings multiple times. Double checked that it's set to OEM and not Off.

Different setting question if you're up for it. Should I run the Max Cooling setting? I have it set right now and have noticed two things.
1. It 100% runs cooler (IAT) while transitioning from stop and go to highway. I have not looked at logs to quantify this. Subjective but
2. Fan runs almost every time I drive. It barely came on before.

Wondering what are the negative effects.

 

[suptj]

Thanks man. Yeah, I was able to figure that out. Have "customized" 3 OTS maps and 2 of them (93 / E50) I've changed settings multiple times. Double checked that it's set to OEM and not Off.

Different setting question if you're up for it. Should I run the Max Cooling setting? I have it set right now and have noticed two things.
1. It 100% runs cooler (IAT) while transitioning from stop and go to highway. I have not looked at logs to quantify this. Subjective but
2. Fan runs almost every time I drive. It barely came on before.

Wondering what are the negative effects.

Thats odd. Did you reflash the car after enabling max cooling mode?

Max cooling mode is mainly for the auxiliary pump. It essentially keeps your pump at 100% creating more flow throughout the system/lines. Some state its a lot of stress on the car especially if you're just driving normal and commuting. People like myself keep it on, while others only turn it on when at the track. To each their own I guess. I have something within the works in regards to cooling so if you're interested DM me!

Pros: more flow = more cooling.
Cons: it overworks your cooling system so longterm integrity is at question

 

[OldHead-MKV-Owner]

Thats odd. Did you reflash the car after enabling max cooling mode?

Max cooling mode is mainly for the auxiliary pump. It essentially keeps your pump at 100% creating more flow throughout the system/lines. Some state its a lot of stress on the car especially if you're just driving normal and commuting. People like myself keep it on, while others only turn it on when at the track. To each their own I guess. I have something within the works in regards to cooling so if you're interested DM me!

Pros: more flow = more cooling.
Cons: it overworks your cooling system so longterm integrity is at question

Thanks for the info. Very helpful.
Yup, I reflashed.

 

[ArmenLS1]

Not on hi-flow?

I just flashed stage 2 OTS bm3 on 2021 with customRom. My car has a AA DP high-flow. By default it doesn't pre-select anything for certain settings. So by default it doesn't have cold start and I noticed the idle to be a little rough without it. Definitely going to reflash with that setting back on.

 

[MSport]

I just flashed stage 2 OTS bm3 on 2021 with customRom. My car has a AA DP high-flow. By default it doesn't pre-select anything for certain settings. So by default it doesn't have cold start and I noticed the idle to be a little rough without it. Definitely going to reflash with that setting back on.

I turned mine off and I’m not noticing too much difference in idle so I’ll probably throw the SP1R back on tonight. I’m just going to make sure I get up to temp before driving: my only hope living in a condo with the SP1R. If it damages the Cat I’ll just buy another I guess. But SP1R with hi flow shakes the walls.

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