BM3 engine tunes for track day

[Keca10]

I have stage 1 93 tune right now from BM3. Recently installed.
2018 M3 ZCP, 6 speed.

I always tracked without tunes. I am thinking of de-tuning for a track day to improve on predictability and smooth/linear power delivery. I don’t really push it on the street with this tune where I can tell if it will be an issue.

I am curious if anyone tracks with stage 1 and the experience? Smooth on corner exit?
Are there other better tunes for a track environment (GTS or CS)?

Thanks

[SYT_Shadow]

Gts is most likely more repeatable, as in you'll have the same power the whole day. The gts software is very smooth and still powerful.
Others choose to do stg1 and limit the torque

In the street it is completely impossible to replicate the conditions of even an intermediate driver at the track. Two different universes.

Just a short story, last year I instructed a dude that had just received his 800whp 997 turbo engine from getting built for a year etc. The engine did not make it through the weekend. Street people can do lots of things that cannot be replicated on the track

[Keca10]

Exactly my thoughts. I can’t really get a sense of it on public roads (nor do I want to). I was thinking GTS may be best for the track to give me a little extra power. Stage 1 is a blast for commuting and farting around on the street.

[b_w.]

I went with a custom tune from f80 paul. Had all the mid range torque flattened out and increased the top end. Super smoothe and can lay into it coming out of the corners without blowing the back end out . I went this way so I could switch between high torque street tune and track tune.

[sly1types]

Originally Posted by b_w.

I went with a custom tune from f80 paul. Had all the mid range torque flattened out and increased the top end. Super smoothe and can lay into it coming out of the corners without blowing the back end out . I went this way so I could switch between high torque street tune and track tune.

yup same here. F80Pauls road course tune is great for putting power down. This is better than the GTS or CS tunes also as far as how linear it is, doubt it makes more power. You lose some for the torque, but it puts down power more like a NA car.

[Track/S]

For track I would not use any stage with the oem turbos, between the stock tune and gts there is no noticeable difference.

The oem turbos are very small with a tune the only thing that is achieved on the track is stress for the engine, if you want more power mount hybrid turbos and with stage2h 91 you would have enough power without stressing the engine.

2 weeks ago I was tracking with +22° and the oil temperature did not exceed 90°, before I was tracking with stage2h 93, too much power.

Originally Posted by sly1types

yup same here. F80Pauls road course tune is great for putting power down. This is better than the GTS or CS tunes also as far as how linear it is, doubt it makes more power. You lose some for the torque, but it puts down power more like a NA car.

Is there a dyno graph?

[Suds]

Yep, I track with a stage 1 93 tune. I did on a ‘15 M4, then a ‘19 M4 and now a ‘19 M2.
You can always run in Econ mode for a smoother throttle, especially on a wet track or if it starts to rain. I track about 24-30 days a year, so I do have a bit of experience and you do have to be smooth on the throttle.

[Theruleslawyer]

I don't get putting the additional stress on the engine on track for HPDE. Maybe if you're running time attack and it matters. If I'm doing anything, its to de-stress the engine. Additional cooling, better oiling, etc.

[shaddy]

I've been running Stage 2 93 BM3 with 20% torque reduction in 1-3 for a while now. I was on Stage 1 and got DPs, then moved to Stage 2. Did torque reduction on both. Probably around 30 track days or so on this setup and I drive in Sport. The throttle feels linear and has a higher top end than stock. The problem with most OTS tunes is the massive power spike you get that makes throttling out a pain. Torque reduction solved that for me and made street driving better as well.

[Keca10]

Update: I ran this weekend with the BM3 GTS coding. I tuned it down from stage 1 for the track.

I didn’t feel much of a difference vs stock. It would lurch forward in a few areas where it didn’t do it normally and I would gain a car length or two on the person in front of me.

In fact the car ran slower than stock ZCP overall. There are sections where I normally get to 4th gear before braking and now I was still in 3rd. I had better/newer tires too. However, I think it was much hotter this time around (90 degrees) and I am sure that plays a big role.

[aswy6]

I have catless downpipes and always run with BM3 CS+ tune on the street. I have always been scared to use it on track and always flashed my car back to stock civic M3 tune. In my case the dofference between stock and CS+ with catless downpipes is huge! (Butt dyno) but im scared to try it because of crank hub and me being at 60r miles

[vrptstyly]

I track mostly on the CS+ tune, also around 60k. I have never tried the GTS tune but I’ve tried the stage 1 and it has bit me at Pocono.

Ever since that day it’s a mental thing for me. I spend more time worried about rear traction (square 275 setup). The CS+ keeps the car happy and I have more fun tossing the car around on it.

I’ve seen a 5-10mph increase on the straights at my local tracks on stg1.

[aswy6]

Originally Posted by vrptstyly

I track mostly on the CS+ tune, also around 60k. I have never tried the GTS tune but I’ve tried the stage 1 and it has bit me at Pocono.

Ever since that day it’s a mental thing for me. I spend more time worried about rear traction (square 275 setup). The CS+ keeps the car happy and I have more fun tossing the car around on it.

I’ve seen a 5-10mph increase on the straights at my local tracks on stg1.

Do you have crank hub done? I may try running a ZCP tune next track day or would you say i should not worry about crank hub and send it with CS+ tune? Butt dyno feels like CS+ has like 100 more hp over civic M3. Also, how will it do in 100+ temperature?

[GuyLedouche]

Originally Posted by sly1types

yup same here. F80Pauls road course tune is great for putting power down. This is better than the GTS or CS tunes also as far as how linear it is, doubt it makes more power. You lose some for the torque, but it puts down power more like a NA car.

Does he offer the road course tune for something less than a custom tune?

[4Y_stack_acceleration]

Are there any tunes and/or turbo mods that make the power curve linear, i.e. the torque doesn't fall off dramatically after 5k RPM?

Fun fact: the 991.2 GT2 RS and a (stage 1 BM3) S55 have the same peak torque, except that that the GT2 RS maintains that torque well into the the high RPMs while it falls off a cliff for the S55 after 5k RPM.

So even though the GT2 RS is turbocharged, it has a pretty linear power curve that resembles NA power curves.

https://www.tpcracing.com/product/99...ort-ecu-tuner/

[SYT_Shadow]

Originally Posted by 4Y_stack_acceleration

Are there any tunes and/or turbo mods that make the power curve linear, i.e. the torque doesn't fall off dramatically after 5k RPM?

Fun fact: the 991.2 GT2 RS and a (stage 1 BM3) S55 have the same peak torque, except that that the GT2 RS maintains that torque well into the the high RPMs while it falls off a cliff for the S55 after 5k RPM.

So even though the GT2 RS is turbocharged, it has a pretty linear power curve that resembles NA power curves.

https://www.tpcracing.com/product/99...ort-ecu-tuner/

A larger turbo could flow enough to have a very flat torque curve past 5k rpm.
However, most people would use that larger turbo to create an even larger -and dumber- torque hump at 3500rpm that would then fall off a cliff after 5500, like the stock turbos do when tuned.

I'm sure somewhere out there, there is a tune for the gt2 rs that creates a similarly stupid torque hump and you'd also see it fall off a cliff at higher rpms.

Oems: moderate torque over as wide a range as possible
Most tunes and consumers: "give me 1000ftlb at 3.5k rpm. Doesn't matter it's useless, or will break the car. I'm Michael Schumacher and I can easily handle that"



The link you included shows a very moderate tune for smart people. Pretty much the same as the civic vs gts map. The gts map doesn't "fall off a cliff" either. But who wants to run the gts map when there is extra torque to be had at 3500rpm!

[b_w.]

Originally Posted by 4Y_stack_acceleration

Are there any tunes and/or turbo mods that make the power curve linear, i.e. the torque doesn't fall off dramatically after 5k RPM?

Fun fact: the 991.2 GT2 RS and a (stage 1 BM3) S55 have the same peak torque, except that that the GT2 RS maintains that torque well into the the high RPMs while it falls off a cliff for the S55 after 5k RPM.

So even though the GT2 RS is turbocharged, it has a pretty linear power curve that resembles NA power curves.

https://www.tpcracing.com/product/99...ort-ecu-tuner/

Single turbo conversion may provide more head room at the peak rpm band.

[Track/S]

Originally Posted by 4Y_stack_acceleration

Are there any tunes and/or turbo mods that make the power curve linear, i.e. the torque doesn't fall off dramatically after 5k RPM?

Fun fact: the 991.2 GT2 RS and a (stage 1 BM3) S55 have the same peak torque, except that that the GT2 RS maintains that torque well into the the high RPMs while it falls off a cliff for the S55 after 5k RPM.

So even though the GT2 RS is turbocharged, it has a pretty linear power curve that resembles NA power curves.

https://www.tpcracing.com/product/99...ort-ecu-tuner/

The gt2rs turbos are VGT (variable geometry turbocharger) and huge, this helps to not be slow at low revs and keep the torque flat at high revs.

[4Y_stack_acceleration]

Originally Posted by SYT_Shadow

A larger turbo could flow enough to have a very flat torque curve past 5k rpm.
However, most people would use that larger turbo to create an even larger -and dumber- torque hump at 3500rpm that would then fall off a cliff after 5500, like the stock turbos do when tuned.

I'm sure somewhere out there, there is a tune for the gt2 rs that creates a similarly stupid torque hump and you'd also see it fall off a cliff at higher rpms.

Oems: moderate torque over as wide a range as possible
Most tunes and consumers: "give me 1000ftlb at 3.5k rpm. Doesn't matter it's useless, or will break the car. I'm Michael Schumacher and I can easily handle that"



The link you included shows a very moderate tune for smart people. Pretty much the same as the civic vs gts map. The gts map doesn't "fall off a cliff" either. But who wants to run the gts map when there is extra torque to be had at 3500rpm!

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.

[4Y_stack_acceleration]

Originally Posted by b_w.

Single turbo conversion may provide more head room at the peak rpm band.

https://bigboostturbo.com/products/s55-single-turbo-kit

This does look like a flatter torque curve past 3.5k RPM.

Will this have more turbo lag? Not sure how this will behave on the street with a sudden ramp of torque at 3.5k RPM to 700lbft... 964 single turbo vibes

Can you just put two larger turbos for a flat torque curve from 2k to 7k RPM?

Edit: https://www.audizine.com/forum/showt...-Pureturbo-RS3
This dyno looks pretty good, much less low end torque but a flattish torque curve after 4k RPM

[g2]

Originally Posted by 4Y_stack_acceleration

https://bigboostturbo.com/products/s55-single-turbo-kit

This does look like a flatter torque curve past 3.5k RPM.

Will this have more turbo lag? Not sure how this will behave on the street with a sudden ramp of torque at 3.5k RPM to 700lbft... 964 single turbo vibes

Can you just put two larger turbos for a flat torque curve from 2k to 7k RPM?

Edit: https://www.audizine.com/forum/showt...-Pureturbo-RS3
This dyno looks pretty good, much less low end torque but a flattish torque curve after 4k RPM

Looks perfect. Would this be possible for my car that has VTT GC turbos that will be at the track? Who can I contact to do this?

[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.