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      02-03-2019, 10:15 AM   #1
Halim@HCP
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Bootmod3 S55 TQ limitation OTS tests - on STOCK and UPGRADE turbos - dynorun results

Back on our dynojet this time with 2 S55 powered cars !

Specs/mods:
M3 F80 DCT EU Spec
Mods:
  • Pure stage 2+
  • FI Exhaust Catless downpipes
  • K&N Drop-in filters

Name:  M3 F80.PNG
Views: 7890
Size:  1.93 MB

M4 F82 DCT EU Spec
Mods:
  • Akrapovic Catless downpipes
  • K&N Drop-in filters

Name:  33132368-565b-4247-bca2-bbe415298655.jpg
Views: 7517
Size:  69.3 KB

All runs were done in Engine on sport plus, Manual mode 5th gear and on Shell V-Power 100RON(93-94OCT)

The boost by gear / torque limitation by gear feature has been on the bootmod3 config for a very long time, so we decided to dyno it.

The (non ZCP and ZCP) torque is set to 550NM (405lbft) in the stock tune, the CS/GTS OEM maps have a torque limitation set to 650NM (480lbft). The OTS maps have a torque limitation of 750NM (553lbft).

What does all this mean for the daily user or even those who track their cars?

Well, putting down the massive torque the bootmod3 OTS maps bring is not always easy, especially in the first 3 gears. Here you can simply lower the torque output throughout the RPM range by a given percentage that suits you and your car best.

Trackday! Having linear torque in curves is always a great thing (N/A like), good thing here is that you do not have to lower your power output when you get on the straight stretches e.g. 4th even 5th gear! Here you want to be as fast as possible, no need to limit power

We tested 20% limitation as shown here:

Name:  WhatsApp Image 2019-02-03 at 13.11.31.jpeg
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Size:  34.0 KB

Here are the results from the M4:

We dynod the following:
  • Stock tune
  • Bootmod3 Stage 2 93OCT
  • Bootmod3 Stage 2 93OCT with 20% limitation

All plotted:

Name:  Stock turbo_93OCT_Stock_STG2_STG2 20pct limit.PNG
Views: 10674
Size:  122.8 KB

Next up the M3:
  • Stock tune (this was measured when the car was stock)
  • Bootmod3 Stage 2 93OCT
  • Bootmod3 Stage 2 93OCT with 20% limitation
  • Bootmod3 Stage 2 93OCT with 550NM torque limitation as stock to show that this limits torque to a stock torque limit, even on upgrade turbos!

All plotted:

Name:  M3 PS2+ TQ limitation.PNG
Views: 7845
Size:  139.6 KB

Stage 2 93OCT and Stage 2 93OCT with 20% limitation

Name:  M3 PS2+ STG2 93OCT and 20PCT.PNG
Views: 7520
Size:  115.7 KB

Stage 2 93OCT with stock torque limit and stock tune (from when the M3 was stock)

Name:  Stock car_Stock 550NM STG2 PS2+.PNG
Views: 7600
Size:  105.3 KB

Just for comparison sake, last post I made for all the OTS maps including the free ones, such as the CS map. The CS map has a torque limit of 600NM, which should equal the 20% limitation done on the Bootmod3 Stage 2 93OCT OTS. Results are very clear! Torque is the same between the CS and the 20% limited stage 2 93OCT OTS map until a certain RPM

Name:  CS tune vs STG2 93 OCT 20PCT.PNG
Views: 7381
Size:  112.6 KB

Last edited by Halim@HCP; 02-03-2019 at 11:10 AM.. Reason: Pictures of cars and config
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      02-03-2019, 11:42 AM   #2
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As always brilliant work Halim!!
thanks for the info
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      02-03-2019, 12:16 PM   #3
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BM3 never ceases to amaze me.
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      02-03-2019, 03:56 PM   #4
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Wait so...to put it more simply, we can enjoy a "flat torque map" without any need for custom tuning, simply by using a ~20% boost reduction on our OTS maps?

To me at least, the "Stage2 20% limit" looks more streetable than the standard OTS map without the reduction. Stock like until 5000rpm than it keeps pulling another 1000rpm whereas the stock tune plateaus!
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      02-03-2019, 05:57 PM   #5
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Quote:
Originally Posted by TrueNorthM3 View Post
Wait so...to put it more simply, we can enjoy a "flat torque map" without any need for custom tuning, simply by using a ~20% boost reduction on our OTS maps?

To me at least, the "Stage2 20% limit" looks more streetable than the standard OTS map without the reduction. Stock like until 5000rpm than it keeps pulling another 1000rpm whereas the stock tune plateaus!
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!
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      02-03-2019, 08:04 PM   #6
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Anyway this would be possible per drive mode? Sport and sport plus?
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      02-03-2019, 08:07 PM   #7
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Boost by gear feature and ability to tweak reduction by gear is so sweet
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      02-03-2019, 08:19 PM   #8
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Quote:
Originally Posted by Halim@HCP View Post
Quote:
Originally Posted by TrueNorthM3 View Post
Wait so...to put it more simply, we can enjoy a "flat torque map" without any need for custom tuning, simply by using a ~20% boost reduction on our OTS maps?

To me at least, the "Stage2 20% limit" looks more streetable than the standard OTS map without the reduction. Stock like until 5000rpm than it keeps pulling another 1000rpm whereas the stock tune plateaus!
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!
Assuming this applies to stage 1 as well? Just reduce boost by 20% in all gears?
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      02-04-2019, 04:44 AM   #9
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Quote:
Originally Posted by musseilm View Post
Anyway this would be possible per drive mode? Sport and sport plus?
Working on this
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      02-04-2019, 04:45 AM   #10
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Quote:
Originally Posted by f80er View Post
Assuming this applies to stage 1 as well? Just reduce boost by 20% in all gears?
Any OTS map !
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      02-04-2019, 09:10 AM   #11
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Can you run the stg 2 93 oct with 20% boost reduction on a car with no other mods?

I was originally going to get a stage 1 but maybe stage 2 with boost reduction is more versatile.

Also am I able to save in my maps multiple versions of an altered ots map?
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      02-04-2019, 10:50 AM   #12
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Quote:
Originally Posted by parabmw View Post
Can you run the stg 2 93 oct with 20% boost reduction on a car with no other mods?

I was originally going to get a stage 1 but maybe stage 2 with boost reduction is more versatile.

Also am I able to save in my maps multiple versions of an altered ots map?
You can just pick the map again under OTS maps and rename it

Sure you can.
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      02-04-2019, 05:40 PM   #13
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Thank You!
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      02-04-2019, 06:57 PM   #14
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Quote:
Originally Posted by Halim@HCP View Post
Quote:
Originally Posted by parabmw View Post
Can you run the stg 2 93 oct with 20% boost reduction on a car with no other mods?

I was originally going to get a stage 1 but maybe stage 2 with boost reduction is more versatile.

Also am I able to save in my maps multiple versions of an altered ots map?
You can just pick the map again under OTS maps and rename it

Sure you can.
How do you rename and save an OTS map?
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      02-05-2019, 12:08 PM   #15
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We just pushed out an update on the web to enable modifying details (name, description, version) on OTS maps as well using the "CHANGE DETAILS" button
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      02-05-2019, 12:28 PM   #16
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Hi Halim,

Keep on doing the great work!
I started a thread for boost by gear and what we've been seeing as the best traction options for at least 1/4 or launch. We have some numbers that say more boost reduction by the first 2 gears help the car launch and drive faster from a stand still. We assumed that it was a linear boost reduction (i.e: -3 or 4 psi across the map)

What does more than 20% reduction do in these cases??
https://f80.bimmerpost.com/forums/sh....php?t=1526251
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      02-05-2019, 12:30 PM   #17
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Quote:
Originally Posted by Simmadown115 View Post
Hi Halim,

Keep on doing the great work!
I started a thread for boost by gear and what we've been seeing as the best traction options for at least 1/4 or launch. We have some numbers that say more boost reduction by the first 2 gears help the car launch and drive faster from a stand still. We assumed that it was a linear boost reduction (i.e: -3 or 4 psi across the map)

What does more than 20% reduction do in these cases??
https://f80.bimmerpost.com/forums/sh....php?t=1526251
It's a global limitor in torque/load. So it will do it across the RPM range.
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      02-05-2019, 12:37 PM   #18
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Holy Cow!!!!

it all makes sense now.... We were worried that excessive boost reduction across the gear would make it limp in lower boost, but it wasn't doing it and we were scared to add more. It's like the heavens have opened and excessive wheel spin on launch can become extinct if we want to!!
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      02-05-2019, 01:07 PM   #19
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Quote:
Originally Posted by Simmadown115 View Post
Holy Cow!!!!

it all makes sense now.... We were worried that excessive boost reduction across the gear would make it limp in lower boost, but it wasn't doing it and we were scared to add more. It's like the heavens have opened and excessive wheel spin on launch can become extinct if we want to!!


This will never limp the car, it's not fooling anything to make less boost, it's simply limitating the torque -> load -> boost
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      02-05-2019, 11:59 PM   #20
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Quote:
Originally Posted by Halim@HCP View Post


This will never limp the car, it's not fooling anything to make less boost, it's simply limitating the torque -> load -> boost
Great work on this...that being said...I am still trying to wrap my head around the idea of upgrading turbos for more efficient boost, and then LIMITING that boost across the map. I guess I understand the notion as far as hookup in lower gears, and minimizing the "torque hit" to achieve a more linear power delivery...I just don't understand the point of adding Pure Turbos if your just gonna neuter them.

What am I missing? Asking with zero douchebaggery in mind.
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      02-06-2019, 07:25 AM   #21
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Quote:
Originally Posted by blockdoc View Post
Great work on this...that being said...I am still trying to wrap my head around the idea of upgrading turbos for more efficient boost, and then LIMITING that boost across the map. I guess I understand the notion as far as hookup in lower gears, and minimizing the "torque hit" to achieve a more linear power delivery...I just don't understand the point of adding Pure Turbos if your just gonna neuter them.

What am I missing? Asking with zero douchebaggery in mind.
You won’t neuter them in 3rd to 6th at higher speeds.
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      02-06-2019, 08:22 AM   #22
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Quote:
Originally Posted by chewbakam4 View Post
Quote:
Originally Posted by blockdoc View Post
Great work on this...that being said...I am still trying to wrap my head around the idea of upgrading turbos for more efficient boost, and then LIMITING that boost across the map. I guess I understand the notion as far as hookup in lower gears, and minimizing the "torque hit" to achieve a more linear power delivery...I just don't understand the point of adding Pure Turbos if your just gonna neuter them.

What am I missing? Asking with zero douchebaggery in mind.
You won't neuter them in 3rd to 6th at higher speeds.
How is that if you cut boost by 20 percent across the board! Sorry for being dense here
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