[Poochie]

I understand the concept of an aftermarket tune; the idea is to reverse-engineer the factory mapping by identifying locations of various parameters and altering it to maximize the power output. However, what worries me is a typical ECU sometimes contains over 50 difference settings controlling the engine's load based on various conditions.

Tuners modifying the maps doesn't take into account every program running on the engine's computer, including communication with the transmission for traction control / DSC and possibly idle speed, if they are not specifying a tune based on the specific tranny.

Instead, they just blindly copy what was there from the factory, then change the 'maps' - the data tables describing fuel quantity and ignition+cam advance for throttle, airflow, air temperature, engine temperature, boost, etc inputs but not the transmission's micro-controller coding.

So the power load is increased but the transmission is forced to play catch-up. Or in the case of a manual; an off-key power output, contrary to how it's was originally designed to operate. Which I suspect is responsible for the sometimes wonky traction issue. But credit to Bm3 for at least giving the option of boost-by-gear control to partially offset this phenomenon.

The only way around this is to re-write a factory mapping from scratch, which only the manufacture has the resources and equipment to accomplish such a specific task.

For this reason, some BMW automatics transmission/DCT are tuned stock with slightly more (or less) power than its manual counterpart, since each map is transmission-based from the factory.


https://m.carsdirect.com/car-mainten...-transmissions

[nomoracin]

Originally Posted by Karmic Man

Just 'a bit faster'?

Which OTS map is the car running on?

I take it back...I took her out again today because it was 50ish degrees out and noticed a significant difference with the CS map than stock now.

...proceed with purchase! Haha

[M-Supra]

Originally Posted by nomoracin

Contemplating whether or not to flash with bootmod3...

So tempted, but worried about warranty.

What say you?

Been running BM3 for 35K+ miles (currently 51K miles) on my 2018 OG M2, zero issues and she'll run off and leave an M2 Competition...unless of course its been BM'd

I'm not easy on cars, I do take care of them, but I run her hard every time I'm in her

http://www.bootmod3.net/log?id=5c74446ac090c6659e11c9a0

Cleve

[mike@x-ph.com]

Originally Posted by M-Supra

Been running BM3 for 35K+ miles (currently 51K miles) on my 2018 OG M2, zero issues and she'll run off and leave an M2 Competition...unless of course its been BM'd

I'm not easy on cars, I do take care of them, but I run her hard every time I'm in her

http://www.bootmod3.net/log?id=5c74446ac090c6659e11c9a0

Cleve

Nice

[M-Supra]

Originally Posted by mike@x-ph.com

Nice

Thanks Mike!

[nomoracin]

So, I took her out today since we finally got some nice warm/sunny weather...and I got up to roughly 455hp on our sport display thingy!

[AlpsRider]

It's just estimated, but still!

Which tune profile were you running?

[nomoracin]

Originally Posted by AlpsRider

It's just estimated, but still!

Which tune profile were you running?

Bm3 cs map

[doughboy]

Crank figures of course...

On previous BMs (M3 / M6 / M5) the sport displays never changed with engine power increases / remaps as they are just a fudge based on standard output.

My M6GC was 725bhp, but still only went to 565 on the sport display.

OP - are you saying your sport displays read higher now its mapped?

[Proctor750]

Originally Posted by nomoracin

Bm3 cs map

Taking advantage of that free sat radio on BPM I see.

How does the car feel? CS or CS+? Will you bump up to CS+? Can you feel the power come more immediate as the torque reduction should be gone now as well. Have you played with torque by gear?

[nomoracin]

Originally Posted by doughboy

Crank figures of course...

On previous BMs (M3 / M6 / M5) the sport displays never changed with engine power increases / remaps as they are just a fudge based on standard output.

My M6GC was 725bhp, but still only went to 565 on the sport display.

OP - are you saying your sport displays read higher now its mapped?

I believe so.

Can someone with a stock map confirm what numbers are on the default sport display?

[nomoracin]

Originally Posted by Proctor750

Taking advantage of that free sat radio on BPM I see.

How does the car feel? CS or CS+? Will you bump up to CS+? Can you feel the power come more immediate as the torque reduction should be gone now as well. Have you played with torque by gear?

Haha. Yea. BPM ftw!

It's the regular CS map.

Yes, I feel a lot more power throughout actually. It even sounds better too. I can hear the turbo and "bov" plus there's a little more growl to her.

Once I get bored/used to the CS, then I may try the CS+...then to Stage 1

[MTWO]

BM3 is solid! By far best money spent on this car no doubt.

[nomoracin]

I think I'm ready to upgrade to the CS+ map...weather is warmer now too!

[Kelvin1000]

Originally Posted by nomoracin

I think I'm ready to upgrade to the CS+ map...weather is warmer now too!

Is the CS+ Map still in beta?

[nomoracin]

Originally Posted by Kelvin1000

Is the CS+ Map still in beta?

Yes, looks like it...

[jdub486]

Just flashed BPM's CS file on my m2C DCT. Will post a review soon and hopefully dyno in early May.

[Bimmer28312]

Following this thread for sure! The day I get car back from break-in service going straight to cs+ hehehe

[mike@x-ph.com]

Originally Posted by Bimmer28312

Following this thread for sure! The day I get car back from break-in service going straight to cs+ hehehe

Nice

[m20e3087]

I am getting ready to purchase bm3, got few questions. USA car.

When I take my car for regular service (non-warranty items) should I lock the ecu and code everything back to stock?

Is it okay to mention I have a tune and tell them don't update the software without my consent?

[Proctor750]

Originally Posted by m20e3087

I am getting ready to purchase bm3, got few questions. USA car.

When I take my car for regular service (non-warranty items) should I lock the ecu and code everything back to stock?

Is it okay to mention I have a tune and tell them don't update the software without my consent?

I'd definitely return everything to stock and you MUST not let them update the software or you won't be able to retune (yet).

Whether you tell them or not depends on your relationship with the guys there. It's not their call if you get warranty work or not on i.e. spun crank hub - BMW NA is who decides that after they connect your car and I imagine find that it's been tampered with. I've heard of people getting warranty work anyway and others not. I have no clue why there is a discrepancy.

Maybe if they see a Money shift in the data they won't help, or perhaps it's when there is physical damage vs limp mode that has them dig deeper into tampering etc.

[Juicehead]

Originally Posted by m20e3087

I am getting ready to purchase bm3, got few questions. USA car.

When I take my car for regular service (non-warranty items) should I lock the ecu and code everything back to stock?

Is it okay to mention I have a tune and tell them don't update the software without my consent?

1. I always revert back, even on an oil change, call me paranoid.
2. I would not mention you have a tune, but on a side note... I brought mine in for the 1200 mile service a few weeks ago and they did not update to the new revision (istep). I have a sneaking suspicion that the update may only be for OPF cars (non-US), but I could be wrong.