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2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning M240 Dyno Testing

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      01-11-2017, 10:33 AM   #1
KC 07
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Smile M240 Dyno Testing

Just curious ... the M240 has been out for some time now and I don't see much out there on dyno specs for WHP & TQ. The M240 has a the new B58 engine, slightly larger turbo and updated pipe work to help cooling than the outgoing M235. The M140 w/ the same B58 engine posted 349 BHP and 384TQ on a dyno in the UK. Has anyone seen any credible dyno testing done on the M240?? To produce the stock 4.2 (0-60 time) and 12.7 (1/4 mile) it would seem to be producing more power than the factory stated 340 BHP / 370 TQ. Does anyone have any thoughts or know of any recent credible dyno testing?
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      01-11-2017, 10:43 AM   #2
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I'm schedule for an Insoric test on the 21st. It's a new method of measuring whp and wtq. Mine is xDrive though so won't be as high as others, but I'm hoping it's close to those numbers. The Insoric system has shown to be pretty damn accurate so I'm confident the numbers I get are accurate.
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      01-11-2017, 11:19 AM   #3
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Thanks Joe240 for sharing your upcoming M240 dyno test later this month (Jan). Let the forum know what you learn. My goal is to make some sense of the published numbers on BHP & TQ vs the stated times posted by BMW and others. Something is not adding up when I see the 0-60 times and the 1/4 mile times. My guess is that BMW is understating the numbers slightly.
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      01-11-2017, 11:47 AM   #4
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Quote:
Originally Posted by KC 07 View Post
Thanks Joe240 for sharing your upcoming M240 dyno test later this month (Jan). Let the forum know what you learn. My goal is to make some sense of the published numbers on BHP & TQ vs the stated times posted by BMW and others. Something is not adding up when I see the 0-60 times and the 1/4 mile times. My guess is that BMW is understating the numbers slightly.
BMW is notorious for understating their numbers. They always report low numbers probably because their motors will generate ATLEAST that much power. Kind of like, "Well on the engine's worst day and running conditions, it will put out at least this much power" which is nice because you know that you're buying a powerful car under all circumstances.
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      01-11-2017, 11:55 AM   #5
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Quote:
Originally Posted by Joe240 View Post
BMW is notorious for understating their numbers. They always report low numbers probably because their motors will generate ATLEAST that much power. Kind of like, "Well on the engine's worst day and running conditions, it will put out at least this much power" which is nice because you know that you're buying a powerful car under all circumstances.
But outside of changes in power/performance associated with changes in altitude and possibly extreme heat/cold how much "variation" is there in reality?

At least in my limited experience its a very small amount

I'm grateful that they are conservative on estimates instead of the opposite.....thats for sure

I'm itching for Dinan to release some goodies for the B58
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      01-11-2017, 01:46 PM   #6
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http://www.2addicts.com/forums/showthread.php?t=1317455
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      01-11-2017, 03:15 PM   #7
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Thanks for sharing. My assumption is soon we will have numbers that are consistent on the M240 (B58) given the number vehicles that are out there and the fact many are beginning to do tuning work now. It appears that BMW is conservative once again on the stock M240. There is a you tube video out there on the M140 (stock B58) on dyno. It pulled 349BHP / 384TQ which is about +3% / +10-15 over published. Great to hear the many positive comments on the M240. I have an M240xi scheduled for delivery in early March (Alpine White / Blk Leather / Blk Kidneys / Blk / Orbit Grey Wheels, etc.
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      01-11-2017, 05:41 PM   #8
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Agreed - if the B58 proves to be reliable and problem free we're in good stead. My 240i should be in my hands next weekend.
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      01-12-2017, 10:01 AM   #9
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Quote:
Originally Posted by KC 07 View Post
Thanks for sharing. My assumption is soon we will have numbers that are consistent on the M240 (B58) given the number vehicles that are out there and the fact many are beginning to do tuning work now. It appears that BMW is conservative once again on the stock M240. There is a you tube video out there on the M140 (stock B58) on dyno. It pulled 349BHP / 384TQ which is about +3% / +10-15 over published. Great to hear the many positive comments on the M240. I have an M240xi scheduled for delivery in early March (Alpine White / Blk Leather / Blk Kidneys / Blk / Orbit Grey Wheels, etc.
Most dyno figures are at the wheels power, so the BMW estimates of crank HP/TQ are off a lot more than the 3% and 10-15 you're talking about, but either way underrated. Assuming 12% drivetrain loss you'd be about 395 hp and 435 tq.
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      01-12-2017, 12:00 PM   #10
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I've been thinking the past couple days about whether or not I should consider doing the Insoric runs on the factory 225/245 staggered 18s, or if I should stick with my 235/265 19s. Does the extra 1.5% rolling diameter difference make that big of a difference on the wheel power rating? I'm assuming since the Insoric system uses a center cap mounted sensor instead of rolling a drum that it wont matter much, but I could be wrong. Thoughts?
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      01-12-2017, 09:35 PM   #11
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Quote:
Originally Posted by Joe240 View Post
I've been thinking the past couple days about whether or not I should consider doing the Insoric runs on the factory 225/245 staggered 18s, or if I should stick with my 235/265 19s. Does the extra 1.5% rolling diameter difference make that big of a difference on the wheel power rating? I'm assuming since the Insoric system uses a center cap mounted sensor instead of rolling a drum that it wont matter much, but I could be wrong. Thoughts?
Based on the report it seems there will a difference. BUt i am not sure how a center cap mounted sensor works

http://www.caranddriver.com/features...d-tires-tested
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      01-13-2017, 01:45 AM   #12
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Quote:
Originally Posted by NJ-BMW View Post
Based on the report it seems there will a difference. BUt i am not sure how a center cap mounted sensor works

http://www.caranddriver.com/features...d-tires-tested
Interesting read. However, when comparing the 18s and the 19s it was a difference of .1seconds when doing a 0-100 run. The 0-60 run was the same. Also, this was on a car that came stock with 15s so is geared for smaller tires. Going to the 18s and 19s I'm sure they had to have slightly bigger tires than those 15s (though I know they tried to stay as close as possible) so I think that's why the difference is there. The 235/240 come with 18s and the 19s I got are pretty close in size to the 18s so I'm thinking it wont have a big affect on the numbers.
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      01-21-2017, 09:00 AM   #13
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SO the results are in. Just got home from my "Dyno" run using the Insoric Real-Power system. Pretty surprised with the performance since it was -1.5C out (about 29F for myself and my oddball American brothren who don't use the metric system).

Results below:
313PS at the wheel
363.1PS at the crank (estimated)
507.5Nm at the crank

For us Americans, that's:
308.7 HP at the wheel
358.1 HP at the crank (estimated)
374.3 TQ at the crank

Thought it was odd that they measured the car at 1830kg (just over 4k lbs), but it had a full tank of gas and the gentleman doing the run was probably around 180-200lbs as well so I guess it's not a bad measurement.

These numbers are from a 2017 m240i xDrive U.S. Spec. So RWD will be higher and also in higher temps should also improve more. Overall, I'm very happy with the run and results.
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File Type: pdf Insoric BMW M240i xDrive.pdf (102.0 KB, 689 views)

Last edited by Joe240; 01-21-2017 at 09:11 AM..
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      01-21-2017, 09:24 AM   #14
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Joe240 - thanks for sharing your results. Sounds like you were happy w/ the 358 HP / 374 TQ. Your numbers are close to the recent M140 RWD dyno numbers in the UK (you tube video) which were 349 HP / 384 TQ. What is the primary difference / benefit w/ Insoric testing?
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      01-21-2017, 10:27 AM   #15
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Insoric uses a sensor on the wheel to calculate the numbers using angular velocity and other algorithms. The benefit to Insoric over a dyno/mustang jet is that the measurements are taken during normal driving conditions. With the dyno/mustang jet, it's on a machine with cooling fans blowing on the front of the car to simulate driving conditions. Some say that if there isn't proper cooling conditions then the numbers can be off. Also, some places don't adjust the barometric pressure and temperature settings when input into the machine. With the Insoric, they have an actual measurement tool that comes with the kit to measure current temp and barometric pressure, yielding more accurate results.

Plus it's Swedish made and they've never been wrong, right? And they make great products (watches, knives, banks)
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      02-09-2017, 08:35 AM   #16
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Quote:
Originally Posted by Joe240 View Post

Plus it's Swedish made and they've never been wrong, right? And they make great products (watches, knives, banks)
You're confusing the Swedes with the Swiss I think
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      02-09-2017, 10:49 AM   #17
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Originally Posted by jpnh View Post
You're confusing the Swedes with the Swiss I think
yeup, you are correct. My apologies.
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      02-22-2018, 12:48 PM   #18
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BMW M240 Baseline on mustang dyno

Here is my baseline on a mustang dyno at p3 import autoworks in alaska. The number next to it is my friends m235 (claims winter tires) 376 hp 363 tq
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      02-22-2018, 01:27 PM   #19
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Quote:
Originally Posted by aksnowboarder85 View Post
Here is my baseline on a mustang dyno at p3 import autoworks in alaska. The number next to it is my friends m235 (claims winter tires)
Yours is 376HP? What mods?
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      03-09-2018, 11:45 AM   #20
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Quote:
Originally Posted by Joe240 View Post
SO the results are in. Just got home from my "Dyno" run using the Insoric Real-Power system. Pretty surprised with the performance since it was -1.5C out (about 29F for myself and my oddball American brothren who don't use the metric system).

Results below:
313PS at the wheel
363.1PS at the crank (estimated)
507.5Nm at the crank

For us Americans, that's:
308.7 HP at the wheel
358.1 HP at the crank (estimated)
374.3 TQ at the crank

Thought it was odd that they measured the car at 1830kg (just over 4k lbs), but it had a full tank of gas and the gentleman doing the run was probably around 180-200lbs as well so I guess it's not a bad measurement.

These numbers are from a 2017 m240i xDrive U.S. Spec. So RWD will be higher and also in higher temps should also improve more. Overall, I'm very happy with the run and results.
This is similar numbers to the 340/440 with MPPSK, yet BMW underates the M240 HP figures by about 20 HP, is it safe to assume the B58 in the 240 comes with the MPPK?
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