MHD vs BM3

FrankMstein · 07-11-2024, 02:24 PM

For anyone wanting to know this was OTS2+ MHD vs OTS2 BM3 on the same car the same day. Pay attention to the RunFile_ names/temps.
1 = MHD,
2 = BM3,
3 = MHD.
old car was an older car that was same year BM3 OTS2

New car had Eventuri intakes, downpipes, AA single mid pipe (for sale), and Akrapovic (for sale)
Old car drop-in filters, carbon removed, and downpipe.

MHD had a significant tq advantage, not good for road courses and some tq dip at 3k.
BM3 had a slight advantage for HP and less tq.

By the 3rd pull there was more temp and heat soak.

Name: 2015 F80 M3 MHD and BM3 testing dynos.PNG
Views: 1796
Size: 174.3 KB

Name: 2015 F80 M3 MHD and BM3 testing dynos.PNG
Views: 1796
Size: 174.3 KB

medphysdave · 07-11-2024, 08:24 PM

I'd prefer the older cars tune. Did the new car break loose a little on the Dyno or is it something with the other mods? Very curious

StockholM3 · 07-12-2024, 04:57 AM

Thanks for sharing, that was really interesting to see.
The significantly colder air must have made a difference on the last run.
All runs on pump gas?
Would love to see them compared to the OTS E30 maps

FrankMstein · 07-12-2024, 07:23 AM

medphysdave I can feel it stumble on the street and there isn't enough tq @3k to get it to happen.

StockholM3 All runs on 83 from QT fuel and it is top tier, I wanted Shell but the January run was on shell. I may get an e30 map but I do not have a meter or any way to gauge. Plus I would have to drive an hour to get it and I'm not interested in more power as this car has to last me, I'm poor, and it is way too much power for track/tire.

theweebabySeamus · 07-12-2024, 01:54 PM

How do they feel in comparison? Is one smoother than the other?

FrankMstein · 07-12-2024, 01:58 PM

I can feel the slight hesitation at 3k but it's slight. The torque is very noticeable and consistent, even when hot. Butt dyno can definitely tell. I can barely tell the hp difference but I have not drive this car on the street with BM3. However I did on another car for almost three years.

domacuratl · 07-19-2024, 03:21 PM

I wonder if the unsteadiness in the torque curve has to due with the aftermarket air intakes on both tunes. If you look at the old car dyno graph having the stock air boxes; The torque curve looks very smooth and it has better peak horsepower past 5.5k to redline. This seems very intriguing to me.

FrankMstein · 07-19-2024, 08:06 PM

Quote:

Originally Posted by domacuratl

I wonder if the unsteadiness in the torque curve has to due with the aftermarket air intakes on both tunes. If you look at the old car dyno graph having the stock air boxes; The torque curve looks very smooth and it has better peak horsepower past 5.5k to redline. This seems very intriguing to me.

Look at the ambient temp of the last file, 40F different. That car also had drop outs in two of the cylinders.

domacuratl · 07-20-2024, 07:30 AM

Quote:

Originally Posted by FrankMstein

Look at the ambient temp of the last file, 40F different. That car also had drop outs in two of the cylinders.

I was tracking the ambient temps; I'm just curious if the open element filter have a lot to due with why you are getting the torque dip on the MHD tune and why both tunes dyno graphs don't look as smooth compare to the closed element filter of the old car. I know there could be a significant differences in ambient vs inlet air temps between your old vs new dyno graphs. It has been argued that the stock closed air element is plenty efficient even with cars with upgraded turbos. None the less thanks for sharing your dyno graphs.

FrankMstein · 07-21-2024, 07:43 PM

Quote:

Originally Posted by domacuratl

Quote:

Originally Posted by FrankMstein

Look at the ambient temp of the last file, 40F different. That car also had drop outs in two of the cylinders.

I was tracking the ambient temps; I'm just curious if the open element filter have a lot to due with why you are getting the torque dip on the MHD tune and why both tunes dyno graphs don't look as smooth compare to the closed element filter of the old car. I know there could be a significant differences in ambient vs inlet air temps between your old vs new dyno graphs. It has been argued that the stock closed air element is plenty efficient even with cars with upgraded turbos. None the less thanks for sharing your dyno graphs.

I don’t think that would be the case given how popular hot air and cold air intakes are, they would have seen and addressed it. I will ask MHD and the public if they have seen this and it is a concern. The chart shows that the aftermarket intakes show both tq/hp are lower.

Alexey · 05-06-2025, 08:45 AM

Quote:

Originally Posted by FrankMstein

For anyone wanting to know this was OTS2+ MHD vs OTS2 BM3 on the same car the same day. Pay attention to the RunFile_ names/temps.
1 = MHD,
2 = BM3,
3 = MHD.
old car was an older car that was same year BM3 OTS2

New car had Eventuri intakes, downpipes, AA single mid pipe (for sale), and Akrapovic (for sale)
Old car drop-in filters, carbon removed, and downpipe.

MHD had a significant tq advantage, not good for road courses and some tq dip at 3k.
BM3 had a slight advantage for HP and less tq.

By the 3rd pull there was more temp and heat soak.

Attachment 3499784

How many hp stock on this dyno?

FrankMstein · 05-06-2025, 10:52 AM

Quote:

Originally Posted by Alexey

How many hp stock on this dyno?

What HP did my car do on this dyno? I did not do stock.

mike@x-ph.com · 05-06-2025, 01:07 PM

thank you for sharing

theweebabySeamus · 05-06-2025, 05:11 PM

Did you do any 'adaptation runs' after flashing?

FrankMstein · 05-12-2025, 01:22 PM

Quote:

Originally Posted by theweebabySeamus

Did you do any 'adaptation runs' after flashing?

No, what would that have done? Is there an advantage? I'm sure CES would have recommended if it made a difference. The first run was nearly the same as the 3rd and was likely heat soak. I don't think it would have made any difference.

theweebabySeamus · 05-13-2025, 04:58 PM

Quote:

Originally Posted by FrankMstein

No, what would that have done? Is there an advantage? I'm sure CES would have recommended if it made a difference. The first run was nearly the same as the 3rd and was likely heat soak. I don't think it would have made any difference.

You've never noticed your car pulls harder after it gets a little time/pulls on a flash?

FrankMstein · 05-14-2025, 09:41 AM

No, my butt dyno is not calibrated to +/- 5 tq/hp.

theweebabySeamus · 05-14-2025, 01:12 PM

I'd be surprised if it's not more than that.

wheela · 05-14-2025, 01:21 PM

Quote:

Originally Posted by FrankMstein

No, my butt dyno is not calibrated to +/- 5 tq/hp.

Haha, this gave me a chuckle😂 Where's your NIST traceable calibration cert?

FrankMstein · 05-14-2025, 02:22 PM

Quote:

Originally Posted by wheela

Haha, this gave me a chuckle😂 Where's your NIST traceable calibration cert?

My lab is fully NIST traceable but my ass is way out of calibration.

ceedawg · 10-11-2025, 12:51 PM

So hp goes to BM3 and Tq goes to MHD.BM3 curves appear smoother.I stilllike both. Anyone experience major differences?Imbeing pushed from BM3 to MHD by other owners saying car feels stronger with MHD

Suds · 10-11-2025, 05:03 PM

Looks like street driving, lots of immediate torque would go to MHD.
Track driving, horsepower with smooth power delivery would be BM3.
From this data.

Quote:

Originally Posted by ceedawg

So hp goes to BM3 and Tq goes to MHD.BM3 curves appear smoother.I stilllike both. Anyone experience major differences?Imbeing pushed from BM3 to MHD by other owners saying car feels stronger with MHD

07-11-2024, 02:24 PM	#1
FrankMstein Major 1592 Rep 1,314 Posts Drives: F80 M3, R56 Camden, F56 Join Date: Jun 2021 Location: Charlotte iTrader: (1)	MHD vs BM3 - Dyno charts For anyone wanting to know this was OTS2+ MHD vs OTS2 BM3 on the same car the same day. Pay attention to the RunFile_ names/temps. 1 = MHD, 2 = BM3, 3 = MHD. old car was an older car that was same year BM3 OTS2 New car had Eventuri intakes, downpipes, AA single mid pipe (for sale), and Akrapovic (for sale) Old car drop-in filters, carbon removed, and downpipe. MHD had a significant tq advantage, not good for road courses and some tq dip at 3k. BM3 had a slight advantage for HP and less tq. By the 3rd pull there was more temp and heat soak. Last edited by FrankMstein; 07-12-2024 at 07:25 AM..
	Appreciate 9 medphysdave5209.00 D_SheerDrivingPleasure1665.50 domacuratl64.50 hC1001753.50 ra2289341.50 theweebabySeamus497.00 Tommix86.00 n8dgr84311.50 Nothing328.50 Tweet Quote

07-11-2024, 08:24 PM	#2
medphysdave Major General 5209 Rep 5,288 Posts Drives: M2 CS \| 85 of 592 Join Date: Apr 2015 Location: Charlotte, NC iTrader: (4)	I'd prefer the older cars tune. Did the new car break loose a little on the Dyno or is it something with the other mods? Very curious __________________
	Appreciate 1 FrankMstein1591.50 Quote

07-12-2024, 04:57 AM	#3
StockholM3 New Member 14 Rep 24 Posts Drives: BMW M3 2015 Join Date: Feb 2022 Location: Stockholm iTrader: (0)	Thanks for sharing, that was really interesting to see. The significantly colder air must have made a difference on the last run. All runs on pump gas? Would love to see them compared to the OTS E30 maps
	Appreciate 0 Quote

07-12-2024, 07:23 AM	#4
FrankMstein Major 1592 Rep 1,314 Posts Drives: F80 M3, R56 Camden, F56 Join Date: Jun 2021 Location: Charlotte iTrader: (1)	medphysdave I can feel it stumble on the street and there isn't enough tq @3k to get it to happen. StockholM3 All runs on 83 from QT fuel and it is top tier, I wanted Shell but the January run was on shell. I may get an e30 map but I do not have a meter or any way to gauge. Plus I would have to drive an hour to get it and I'm not interested in more power as this car has to last me, I'm poor, and it is way too much power for track/tire.
	Appreciate 0 Quote

07-12-2024, 01:54 PM	#5
theweebabySeamus Major 497 Rep 1,114 Posts Drives: M3 Join Date: Jul 2014 Location: Bay Area iTrader: (1)	How do they feel in comparison? Is one smoother than the other?
	Appreciate 0 Quote

07-12-2024, 01:58 PM	#6
FrankMstein Major 1592 Rep 1,314 Posts Drives: F80 M3, R56 Camden, F56 Join Date: Jun 2021 Location: Charlotte iTrader: (1)	I can feel the slight hesitation at 3k but it's slight. The torque is very noticeable and consistent, even when hot. Butt dyno can definitely tell. I can barely tell the hp difference but I have not drive this car on the street with BM3. However I did on another car for almost three years.
	Appreciate 0 Quote

07-19-2024, 03:21 PM	#7
domacuratl Private 65 Rep 58 Posts Drives: BMW M4 Join Date: Oct 2023 Location: Alabama iTrader: (0)	I wonder if the unsteadiness in the torque curve has to due with the aftermarket air intakes on both tunes. If you look at the old car dyno graph having the stock air boxes; The torque curve looks very smooth and it has better peak horsepower past 5.5k to redline. This seems very intriguing to me. __________________ 2015 F82 M4 Mineral Gray Metallic / VRSF Charge pipes / VRSF DPs/ Valvetronic Designs Equal Length Valved Exhaust / Vossen RFX 19" Brushed Titanium (19x9.5F w/ 255/35 (Macht Schnell Spacers 10mm) & 19x11R w/ 295/35) on Continental Extreme Contact Sport 02 tires / BM3 Multimap Stg 2+ / Swift Spec R Suspension / NGK Iridium 0.020 / Uniden R3 / 5% tint windows w/ 35% front windshield
	Appreciate 0 Quote

05-06-2025, 01:07 PM	#13
mike@x-ph.com BimmerPost Supporting Vendor 31932 Rep 205,126 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	thank you for sharing __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 725-221-5267
	Appreciate 1 FrankMstein1591.50 Quote

05-06-2025, 05:11 PM	#14
theweebabySeamus Major 497 Rep 1,114 Posts Drives: M3 Join Date: Jul 2014 Location: Bay Area iTrader: (1)	Did you do any 'adaptation runs' after flashing?
	Appreciate 0 Quote

05-14-2025, 09:41 AM	#17
FrankMstein Major 1592 Rep 1,314 Posts Drives: F80 M3, R56 Camden, F56 Join Date: Jun 2021 Location: Charlotte iTrader: (1)	No, my butt dyno is not calibrated to +/- 5 tq/hp. __________________ 2015 Sakhir/Sonoma (first one totalled) 2nd one MHD and BM3, Eventuri, Mosselman, NICECNC, MAD FAT BOY DP, "Valvetronic Designs" single mid, PAGID RSC1, Hotchkis/GTMore, Vorschlag, Bilstein B16/10. Soon Powerflex diff brace.
	Appreciate 1 theweebabySeamus497.00 Quote

05-14-2025, 01:12 PM	#18
theweebabySeamus Major 497 Rep 1,114 Posts Drives: M3 Join Date: Jul 2014 Location: Bay Area iTrader: (1)	I'd be surprised if it's not more than that.
	Appreciate 1 FrankMstein1591.50 Quote

10-11-2025, 12:51 PM	#21
ceedawg Major 475 Rep 1,362 Posts Drives: 2k15 335i xdrive MSport 6spd Join Date: Dec 2017 Location: Big City iTrader: (0)	So hp goes to BM3 and Tq goes to MHD.BM3 curves appear smoother.I stilllike both. Anyone experience major differences?Imbeing pushed from BM3 to MHD by other owners saying car feels stronger with MHD __________________ 2k15 335i Msport xdrive 6spd ,FBO BM3 Stg 2 2k15 M3 6spd ,FBO BM3 Stg 2H2 tune with Hybrid turbs
	Appreciate 0 Quote