BM3 engine tunes for track day

[SYT_Shadow]

Originally Posted by 4Y_stack_acceleration

I think an S55 tune or turbo mod with flatter torque curve is better for both street and track for this chassis. Better launches and low speed pulls without spinning the rears (which occurs even in perfect climate conditions and summer tires), and more predictable on the track.

If I end up doing stage 2 for my car I'll try to figure out if this kind of thing is possible for the S55. Being that my car will mostly be used for track, I want less torque on the low end and more torque on the high end, and a linear power ramp / flat torque curve.

Bm3 allows you to do this yourself with their torque limits

[FrankMstein]

That's how I do it. I just use Efficient. It's a lot easier. The car has more than enough power for the stock setup and available (non slick) tires.

[4Y_stack_acceleration]

Originally Posted by FrankMstein

I just detune the power delivery in the 2300-3700 and reflash. Or you could just use efficient. That works well. Tuned car, no traction control, is a possible spin factory. Efficient, sport, sport+ all have the same power just not 1:1 throttle. So many of these wanker youtubers or vlogers don't understand this.

I don't know the exact numbers but it's factually untrue to say efficient and sport have the same peak power (or torque curve) - the valves are closed in efficient which (probably significantly) increases backpressure, and there's also less engine cooling on efficient. Same principle why highflow/catless exhausts and upgraded intercoolers give more power

[Track/S]

Originally Posted by 4Y_stack_acceleration

I don't know the exact numbers but it's factually untrue to say efficient and sport have the same peak power (or torque curve) - the valves are closed in efficient which (probably significantly) increases backpressure, and there's also less engine cooling on efficient. Same principle why highflow/catless exhausts and upgraded intercoolers give more power

Neither catless nor upgraded intercoolers gives more horsepower on stock s55, upgraded watercooler can maintain power for longer.


We tested on dyno s55 with cats and without, there is no difference.

Efficient vs Sport+ 5HP of diference.

[FrankMstein]

Originally Posted by Track/S

Neither catless nor upgraded intercoolers gives more horsepower on stock s55, upgraded watercooler can maintain power for longer.


We tested on dyno s55 with cats and without, there is no difference.

Efficient vs Sport+ 5HP of diference.

You are correct in the first statement for sure BUT I have gains in 2300-3500 and spool w/o cats.

How many pulls did you do to verify +5hp when it is the same tune? You can get a 5hp loss on heat soak.

[Track/S]

Originally Posted by FrankMstein

You are correct in the first statement for sure BUT I have gains in 2300-3500 and spool w/o cats.

How many pulls did you do to verify +5hp when it is the same tune? You can get a 5hp loss on heat soak.

Spool is likely, but final power?

2 pulls with same tune, in the first we realized that it was efficient, then we tried sport+ and we saw that difference.

[4Y_stack_acceleration]

Originally Posted by Track/S

Neither catless nor upgraded intercoolers gives more horsepower on stock s55, upgraded watercooler can maintain power for longer.


We tested on dyno s55 with cats and without, there is no difference.

Efficient vs Sport+ 5HP of diference.

I stand corrected and learned something new. I tried looking for dyno charts on efficient mode earlier but couldn't find anything

[FrankMstein]

Originally Posted by Track/S

Spool is likely, but final power?

2 pulls with same tune, in the first we realized that it was efficient, then we tried sport+ and we saw that difference.

Three points make straight line and a minimal average. Care to post them up? What tune? I have pulls in both E/S+ (at CES and EuroMpire BM3 OTS 1 and 2) and there is no gain. In fact, they will tell you so. There is only variation, no gain, it's the same tune. You would be the only one I know to have an increase.

[Track/S]

Originally Posted by FrankMstein

Three points make straight line and a minimal average. Care to post them up? What tune? I have pulls in both E/S+ (at CES and EuroMpire BM3 OTS 1 and 2) and there is no gain. In fact, they will tell you so. There is only variation, no gain, it's the same tune. You would be the only one I know to have an increase.

I would have to look up the graphs, it was with stage2h 93, anyway I sold a friend a ton of parts for F80, we will dyno test it soon.

[SYT_Shadow]

Originally Posted by 4Y_stack_acceleration

I don't know the exact numbers but it's factually untrue to say efficient and sport have the same peak power (or torque curve) - the valves are closed in efficient which (probably significantly) increases backpressure, and there's also less engine cooling on efficient. Same principle why highflow/catless exhausts and upgraded intercoolers give more power

I tracked many years on efficient throttle. The valves will open when necessary and the car can recognize it is being driven hard and will enter the same cooling program as when it runs in sport or sport+

[RugbyBro]

Yah aux fans/coolers turn on once you're running hot regardless of throttle mode. I run efficient throttle on track and have my valves unplugged anyway (they do open on efficient over 4k or so rpm)

[FrankMstein]

Also the fans run constant when in S+ anyway.

[hC1001]

I tracked with BM3 stage 1 93 oct tune. I also had hesitation about running the tune due to the increase torque but it wasnt an issue at all. You spend most of the time at higher RPMs that its not really a factor... Just be smooth with throttle input.

I did get heatsoak by following behind a car for a lap or 2. We were doing lead/follow and working our way through traffic. It really surprised me when a NA E46 M3 pulled away from me on a uphill straight.

[snakebyte]

Hi guys, what’s the verdict for 2024. Reading a lot of mixed opinions on this.

I’m current stage 2 bm3 15% torque reduction on each gear.

I got my first track day coming up in a couple days. Trying to figure out if I should be reducing torque or switching to CS or GTS.

1. Theoretically, if I reduced torque down to the same as cs+, would there be any advantage over just flashing with cs+.

2. Also like the idea of driving in efficient mode for the less sensitive throttle. 90% here say it’s the same peak power. 50% reckon Sport mode is better for cooling, 50% say that cooling will be on max regardless.

3. Also if I have to adjust the valve to adhere to noise levels, would I be better setting it to OEM or original on the CS map?

4. What would you recommend? GTS / CS / torque limit stage 2

5. Does burble make any difference to cooling? If so, what’s the best to run?

[WillemM4C]

Stock power is more than enough on track.

[b_w.]

If you are going to run a tune use the gts.

[Markymarkk]

I’m on stock ZCP tune and had my first track day not too long ago. Not once did I ever think I needed more power, I was able to keep up with a few 911 Carrera S and GTS’. I had traction on and it was flashing a good amount especially in the slower corners so I can’t imagine with a stage 2 tune.

I’d maybe start no tune and slowly work your way up the more comfortable you get. Either way good luck and have fun, it’s all I’ve been thinking about since I got home from the track!

[Vmohan5072]

I like to run BM3 CS+ as it feels quite linear to me that pulls to the top end, and more predictable with the throttle