Bootmod3 S55 TQ limitation OTS tests - on STOCK and UPGRADE turbos - dynorun results

[TR930]

So, the dynos presented were a 20 pct reduction in all gears? It was run in 5th gear for the dyno to " show" how it works, but we wouldn't actually reduce it in 5th gear for the street, correct?? Just a reduction in 1-3 for traction but having the higher top end rush in the higher gears of a custom tune over OEM?

[Halim@HCP]

Originally Posted by TR930

So, the dynos presented were a 20 pct reduction in all gears? It was run in 5th gear for the dyno to " show" how it works, but we wouldn't actually reduce it in 5th gear for the street, correct?? Just a reduction in 1-3 for traction but having the higher top end rush in the higher gears of a custom tune over OEM?

Depends if you use for street or track. Yes I simply used 5th to show how it works

[TR930]

Originally Posted by Halim@HCP

Exactly!

No need for custom as you can customize it yourself.

20% limitation is just above stock, more like CS torque but topend is way higher!

Based on what you just stated, it sounds like the stage 2 map is the better choice since now you can "shape" hp and torque curves in the gears you wish and still arrive at higher torque and HP " when you want". Pretty cool if so.

[prodigymb]

awesome info !

any improvements on the horizon for 6MT shift-bog ?

[Bon F80]

Originally Posted by Reid

click

thx Reid , but i believe Padfan9 wants to see the dyno result of OTS Stage 1 91 with 20% torque reduction. same for me too!

Halim@HCP , any chance pls?

[Halim@HCP]

Originally Posted by Pong

thx Reid , but i believe Padfan9 wants to see the dyno result of OTS Stage 1 91 with 20% torque reduction. same for me too!

Halim@HCP , any chance pls?

At the moment I do not have any stock car running 91OCT to dyno. But power should be reduced the same way as it did on the stage 2 M4.

It's lowered in torque by percentage

[Bon F80]

Originally Posted by Halim@HCP

At the moment I do not have any stock car running 91OCT to dyno. But power should be reduced the same way as it did on the stage 2 M4.

It's lowered in torque by percentage

noted with thx Halim@HCP

given there is like 12% reduction in actual max torque from the dyno (from 578 lb-ft to 508 lb-ft) when it's set as 20% reduction, then it's more like to set it as 15% reduction for Stage 1 91 OCT (given lower max torque output at ~545 lb-ft)? of course one will need to test it on dyno to confirm the right setting.

[Padfan9]

Originally Posted by Pong

noted with thx Halim@HCP

given there is like 12% reduction in actual max torque from the dyno (from 578 lb-ft to 508 lb-ft) when it's set as 20% reduction, then it's more like to set it as 15% reduction for Stage 1 91 OCT (given lower max torque output at ~545 lb-ft)? of course one will need to test it on dyno to confirm the right setting.

Are you saying the dyno torque results are 20% less then they should be?

[Halim@HCP]

Originally Posted by Padfan9

Are you saying the dyno torque results are 20% less then they should be?

Well thing is, the maximum torque allowed torque is not reached so going 20% will reduce that maximum allowed torque by 20% But you will see a dramatic change going from 10% to 20% to 30% (you will be doing less than factory TQ here).

[Halim@HCP]

Originally Posted by Pong

noted with thx Halim@HCP

given there is like 12% reduction in actual max torque from the dyno (from 578 lb-ft to 508 lb-ft) when it's set as 20% reduction, then it's more like to set it as 15% reduction for Stage 1 91 OCT (given lower max torque output at ~545 lb-ft)? of course one will need to test it on dyno to confirm the right setting.

I dyno'd the stage 1 91 octane map already together with tons of other OTS maps when my M3 F80 was stock with drop-in filters only. You could do the same calculation and get a result

[hybris]

Great explanations and great feature!

If I understand all this correctly, this feature should maybe have a different name?

Now it's "Boost By Gear (% Reduction)" - which one would assume means that, well, the boost is reduced by the percentage you enter.

But what you're saying is what is really happening is that the torque limit of your current map is reduced by the percentage you enter, which is something pretty different.

So should it be called Torque Limit By Gear (% Reduction) instead? And would it be possible to maybe actually show the default torque limit on that page? Or display it somewhere at least? That would make it easier to understand the expected outcome.

[M-Pilot]

Originally Posted by Remonster

Whatever you're doing, it works extremely well! I've been testing it since yesterday and am really happy with it.



This is actually exactly what I just did, Stage 1 ACN91 with 20% reduction for 1st and 2nd gear and 10% in 3rd gear. "CS map for 1st and 2nd and stage 1 in other gears" is exactly how I would describe it now except the top end of every gear including 1st and 2nd is still just as powerful as the normal Stage 1 tune. Try it out, I am really loving how the car feels with this exact setup. Makes it really easy to launch the car and blast through the first few gears, it's just enough torque to ride the limit of adhesion of the rear tires without excessive wheelspin but still has the big torque hit that the full Stage 1 tune gives you in higher gears.

Have you ever logged with these settings? I used to run CS+ on my M2C but several people on the Facebook BM3 group suggested Stage1ACN would be better for me since I'm in California. So I flashed the Stage 1ACN and set the boost-by-gear same as you 20/20/10 and logged it yesterday in 3rd and 4th gear couple times. I noticed a single knock in some of my 3rd gear pulls from 2.5K to 7K RPm. However, all of my 4th gear pulls have 2-3 knocks each and I couldn't even go beyond 6K RPM in 4th due to the road I was at. The car currently has Shell 91oct. I also showed my logs to a tuner friend of mine and he said even the Stage 1 91ACN is pretty aggressive. I opened a support ticket with BM3 but curious if anyone else logged this ACN map.

[whitedc5]

Originally Posted by cntzl

Have you ever logged with these settings? I used to run CS+ on my M2C but several people on the Facebook BM3 group suggested Stage1ACN would be better for me since I'm in California. So I flashed the Stage 1ACN and set the boost-by-gear same as you 20/20/10 and logged it yesterday in 3rd and 4th gear couple times. I noticed a single knock in some of my 3rd gear pulls from 2.5K to 7K RPm. However, all of my 4th gear pulls have 2-3 knocks each and I couldn't even go beyond 6K RPM in 4th due to the road I was at. The car currently has Shell 91oct. I also showed my logs to a tuner friend of mine and he said even the Stage 1 91ACN is pretty aggressive. I opened a support ticket with BM3 but curious if anyone else logged this ACN map.

I would assume that CS+ is more conservative than even stage 1 ACN, no? You are running less boost, after all.

[M-Pilot]

Originally Posted by whitedc5

I would assume that CS+ is more conservative than even stage 1 ACN, no? You are running less boost, after all.

Yea that's what I thought too. I'm not an expert in tuning so I may not be putting it together as accurate as possible but I was told CS and CS+ are running a very high timing for California 91oct. I probably should log CS+ at some point too but this what I've got so far.

[whitedc5]

Originally Posted by cntzl

Yea that's what I thought too. I'm not an expert in tuning so I may not be putting it together as accurate as possible but I was told CS and CS+ are running a very high timing for California 91oct. I probably should log CS+ at some point too but this what I've got so far.

Does the ACN map feel better overall in terms of power delivery and drivability over the CS+? I've been thinking about switching over to the ACN map but the only thing holding me back is that I have had zero issues with CS+.

[M-Pilot]

Originally Posted by whitedc5

Does the ACN map feel better overall in terms of power delivery and drivability over the CS+? I've been thinking about switching over to the ACN map but the only thing holding me back is that I have had zero issues with CS+.

I had zero issues with CS+ as well but I never logged CS+ so maybe there was knocking with CS+ too. In fact, I tracked my M2C with CS+ at Laguna but made sure to add a few gallons of 100oct race gas so didn't notice any issues. Honestly I wasn't planning on doing anything beyond CS+ but as I said, I was told Stage 1 91ACN map would be better for me even at the track. Both CS+ and Stage 1ACN are great in terms of drivability but Stage1 91ACN pulls noticeably stronger than CS+. I was running 20/20/10 boost by gear with Stage 1 and had knock only 1 out of three 3rd gear pulls while I had 2-3 knocks each in all three 4th gear pulls (again I didn't have any boost reduction in 4th gear). Therefore, I'm right now running 20% boost reduction across all gears with Stage1 91ACN. I'm planning to log again with this setting and see.

[shay2nak]

Originally Posted by Pong

thx Reid , but i believe Padfan9 wants to see the dyno result of OTS Stage 1 91 with 20% torque reduction. same for me too!

Halim@HCP , any chance pls?

+1 even if it’s 93 oct.

What’s the peak power of the stage 1? It’s in the main thread?

[ALCOBENDAS]

Originally Posted by SYT_Shadow

In the M4 with stock turbos and downpipes, the 20% reduction map looks quite beautiful

I wonder what it looks like vs a stock M4 GTS map. Very curious!

No news for that?

[adc]

Novice tuning question, to revive this thread.

I’m running now the Stage 1 93 oct, east coast. I was running BM3 CS map before. I love the Stage 1, but it was suggested since I track my car, to run a torque limitation on the Stage 1 map, for crank hub failure prevention.

Given the expertise on this thread, what torque limitation settings do you recommend? 10% or 15%?

As a reminder I am running 93 octane, and I’ve never felt traction-limited since I never do launches. Needless to say, on track with 305 NT01 rears, no problem with traction. The thought goes more towards avoiding potential spunk crank hub failures...

Any advice would be very appreciated!

[bloke79]

@adc - little late to the party - but this might be helpful.

I've been doing a number of trackdays in my car, and here's how I've set it. Mods are Stage 2 91 map, Advan a050's, BBK, catless downpipes and CBC. I run 93 ron (aussie 98), so went a more conservative tune).

Longest sessions are about ~20 mins, this seems to have worked well.



Cheers,
matt

[adc]

Originally Posted by bloke79

@adc - little late to the party - but this might be helpful.

I've been doing a number of trackdays in my car, and here's how I've set it. Mods are Stage 2 91 map, Advan a050's, BBK, catless downpipes and CBC. I run 93 ron (aussie 98), so went a more conservative tune).

Longest sessions are about ~20 mins, this seems to have worked well.

Attachment 2509481

Cheers,
matt

Matt, many thanks, it’s never too late for good advice.

I’ve run the following reduction settings over the last 2 track events (and daily driving): 20, 10, 10, 0, 0, 0.

I am probably making less power than you are, but I’ll try your settings at the next event in the spring.

Cheers!

[SYT_Shadow]

I still find this to be a fascinating subject

Halim@HCP when I compare the M3 PureTurbos torque limited map to the M4 stock turbos torque limited map, is it just me or are they pretty much identical?

I would have expected larger turbos that are torque limited to produce a lot of top end, certainly more than the stock turbos.

I have no interest in tons of midrange torque, but would like more power up top. Before seeing these results one might think that a torque limited pureturbo setup is the ultimate for me.