[jonahk]

Hey all,

As luck would have it, my dyno session was scheduled for the hottest day of the year in MN. 96-100 degrees in the bay with around 42% humidity. It was worse with the door open.

Here are the results from my session. I'd say these are "worst case" in terms of added performance from the Dinantronics Sport because on top of the temps, I didn't have a chance to switch gas so I'm only running 91.

Despite all the excuses, saw a consistent torque gain in both Sport+ and Race mode (Dinantronics app reported 23-24lbs max boost, OBD II reader said around 14-15.) I'd say it's easily worth the $300 with the added benefit of being stupid simple to install/remove.

2015 M235i, MPE, Sport +, DSC off, 91 Octane, 100deg ambient, 42% humidity; Dinantronics Stock vs Sport.

[jonahk]

2015 M235i, MPE, Sport +, DSC off, 91 Octane, 100deg ambient, 42% humidity; Dinantronics Sport+ vs Race vs Valet

[jonahk]

We ran into some strange behavior, however (to us at lest). Not sure if it was the heat (we let the car cool down after 3-4 pulls each time), or if maybe the ECU is recalibrating itself to deal with the unexpected change in boost pressure, but there were a string of runs when we first put it into "Race" mode that had a strange drop off in torque between 2600 and 4100rpm

The tech was a bit befuddled, and he's tuned many n54 and n55 motors. Anyone who has tuned this generation n55 - is there a "adaptation" period for the ECU after a change like this? IIRC we had 3-4 runs like this before it normalized and the dip went away.

(I'm referencing the dark blue line in this graph labeled "Race mode non-adapted" 4th gear_002.drf)

[pikcachu]

Originally Posted by jonahk

Hey all,

Despite all the excuses, saw a consistent torque gain in both Sport+ and Race mode (app reported 23-24lbs max boost.) I'd say it's easily worth the $300 with the added benefit of being stupid simple to install/remove.

So gains were about 10hp and 35lbs/ft .... i suppose you meant 13-14psi.... at 24 your turbos would be gone already

the stock run was also in the same conditions so not sure how the differential between the 2 would be much different if run in colder weather

If you are happy that's all it matters

[jonahk]

Originally Posted by pikcachu

So gains were about 10hp and 35lbs/ft .... i suppose you meant 13-14psi.... at 24 your turbos would be gone already

the stock run was also in the same conditions so not sure how the differential between the 2 would be much different if run in colder weather

If you are happy that's all it matters

Yeah, I was going off what the Dinantronics app said. OBD II app I had running on my phone (OBD Fusion via LElink) reported 14-15.

[pikcachu]

Originally Posted by jonahk

Yeah, I was going off what the Dinantronics app said. OBD II app I had running on my phone (OBD Fusion via LElink) reported 14-15.

That makes more sense

[jonahk]

Originally Posted by pikcachu

That makes more sense

Edited my original post, thanks for pointing that out (I hadn't even looked at the data logs from the phone yet)

[Dinan_Engineering]

Originally Posted by jonahk

We ran into some strange behavior, however (to us at lest). Not sure if it was the heat (we let the car cool down after 3-4 pulls each time), or if maybe the ECU is recalibrating itself to deal with the unexpected change in boost pressure, but there were a string of runs when we first put it into "Race" mode that had a strange drop off in torque between 2600 and 4100rpm

The tech was a bit befuddled, and he's tuned many n54 and n55 motors. Anyone who has tuned this generation n55 - is there a "adaptation" period for the ECU after a change like this? IIRC we had 3-4 runs like this before it normalized and the dip went away.

(I'm referencing the dark blue line in this graph labeled "Race mode non-adapted" 4th gear_002.drf)

Very odd indeed. First time I am aware of that happening. We will have to keep an eye out on other M235i installs and see if the same occurs there. Glad it appears have normalized itself though.

Originally Posted by pikcachu

So gains were about 10hp and 35lbs/ft .... i suppose you meant 13-14psi.... at 24 your turbos would be gone already

the stock run was also in the same conditions so not sure how the differential between the 2 would be much different if run in colder weather

If you are happy that's all it matters

Originally Posted by jonahk

Yeah, I was going off what the Dinantronics app said. OBD II app I had running on my phone (OBD Fusion via LElink) reported 14-15.

As I noted in the other thread the M235i and the 320i appear to be 2 models where the boost info doesn't display correctly for some reason. We will update the app once more date is gathered and can determine the cause of the discrepancy.

In regards to the comment about weather not having an effect on the delta...

There's a reason why a turbocharged car runs so much better on a brisk morning and like a dog in sweltering heat and it has everything to do with temperature. Hotter intake charge temperatures have a profound effect on turbocharged vehicles. Its forcing the turbos to work harder and produce even more heat as a by-product further reducing the turbos effectiveness. Add more boost and even more heat is generated so in adverse conditions that delta actually shrinks. Coupled with 91 octane the numbers dynoed above are safe to say a near worst case scenario although still pretty respectable given the conditions.

[Mamyf30]

Nice bump in torque. Thanks for the review. Let us know how drivability and gear shifts are at WOT.

[jonahk]

Originally Posted by Dinan_Engineering

Very odd indeed. First time I am aware of that happening. We will have to keep an eye out on other M235i installs and see if the same occurs there. Glad it appears have normalized itself though.

I've got the raw .drf files if you want them? PM me an address and I'll pass them along.

[Luminous]

Good on you for getting this dynoed but those power curves look like the Rocky Mountains...

[XutvJet]

Thanks for doing this. The gains looks decent, especially considering the conditions at hand. Now granted the Dynojet program will try and correct for density altitude (DA) conditions, there's no way of getting around the heat and safety systems employed by BMW's DME to keep the motor happy under hot and humid conditions. I can certainly feel a rather large difference in power between a crisp 60 degree day and a humid 95 degree day in my M235. In the latest Smoking Tire video, Matt Farrah specifically noted just how much more powerful the M2 felt in 60 degree weather vs the 90s he experienced the day before.

In the dyno plots, you can clearly see the DME pulling power after about 5000rpms. Take note of just how flat the HP curve gets. I've seen the same thing with recent M2 dynos done in hot weather. The N55 in the M235/M2 typically has a HP peak occurring at around 6000-6200rpms. These dynos show that curve getting loped off. Not surprising really considering the DA.

Using historical weather conditions for Minneapolis, its elevation of 830' ASL, and plugging the data into a DA calculator, the DA was the equivalent of running the car at 3,500-4,000 ASL. Theoretically, the motor was down 6% in power, although the Dynojet is trying to correct for this. However, like I noted, this N55 appears to be pulling some timing and other safeguard measures on the topend and VERY likely throughout the entire powerband.

Dynoed in lower humidity 60 degree air, I would not be surprised to see the car make more like 305whp/330wtq stock (pretty common for a M235 auto, more for the 6MT) and 320whp/370wtq in Race mode.

[XutvJet]

Originally Posted by Luminous

Good on you for getting this dynoed but those power curves look like the Rocky Mountains...

With the exception of the flakey run with the spike, the curves are quite normal. Ultra smooth lines are simply the result applying significant "smoothing" factors to the plot.

[jonahk]

Originally Posted by XutvJet

Thanks for doing this. The gains looks decent, especially considering the conditions at hand. Now granted the Dynojet program will try and correct for density altitude (DA) conditions, there's no way of getting around the heat and safety systems employed by BMW's DME to keep the motor happy under hot and humid conditions. I can certainly feel a rather large difference in power between a crisp 60 degree day and a humid 95 degree day in my M235. In the latest Smoking Tire video, Matt Farrah specifically noted just how much more powerful the M2 felt in 60 degree weather vs the 90s he experienced the day before.

In the dyno plots, you can clearly see the DME pulling power after about 5000rpms. Take note of just how flat the HP curve gets. I've seen the same thing with recent M2 dynos done in hot weather. The N55 in the M235/M2 typically has a HP peak occurring at around 6000-6200rpms. These dynos show that curve getting loped off. Not surprising really considering the DA.

Using historical weather conditions for Minneapolis, its elevation of 830' ASL, and plugging the data into a DA calculator, the DA was the equivalent of running the car at 3,500-4,000 ASL. Theoretically, the motor was down 6% in power, although the Dynojet is trying to correct for this. However, like I noted, this N55 appears to be pulling some timing and other safeguard measures on the topend and VERY likely throughout the entire powerband.

Dynoed in lower humidity 60 degree air, I would not be surprised to see the car make more like 305whp/330wtq stock (pretty common for a M235 auto, more for the 6MT) and 320whp/370wtq in Race mode.

Great info, Xutvjet. This was my first ever dyno session and it's been a great learning experience.

I do plan on heading back when the temps are more reasonable and when I can fill up with 93. Hoping others have better weather than I did!

[Kolyan2k]

So compared to BMS S1 323hp & 365tq

[Bee Pee]

Originally Posted by pikcachu

That makes more sense

Not really - 14-15 psi should give you heap more power than what it's been shown.

As said already if it drives better and you are happy then that's what matters.

[Fasteddy1]

Thanks for doing this. Where do you do the Dyno? I am in MN also.

Also, please comment on the drive-ability. How does it feel on the road? I am really curious about that.

Thanks!

Pat

[pikcachu]

Originally Posted by Bee Pee

Not really - 14-15 psi should give you heap more power than what it's been shown.

As said already if it drives better and you are happy then that's what matters.

Well... I meant the reading makes more sense.... at 25 it should make 800 hp

[jonahk]

Originally Posted by Fasteddy1

Thanks for doing this. Where do you do the Dyno? I am in MN also.

Also, please comment on the drive-ability. How does it feel on the road? I am really curious about that.

Thanks!

Pat

I did the session down at MAPerformance in Cottage Grove, with the wizard Brian May running the dyno. Found him through the MNBMW facebook group.

I don't notice much of a change in drivability, other than the boost seems more "aggressive" (which is a side effect of there being more of it). It's not at all jerkey or harsh, but it does throw you back in the seat a bit more which is exactly what I wanted.

Also, I know this isn't exactly scientific but here is the M Laptimer app results for 0-60 times with Stock on top and Race on bottom.

[Fasteddy1]

Originally Posted by jonahk

I did the session down at MAPerformance in Cottage Grove, with the wizard Brian May running the dyno. Found him through the MNBMW facebook group.

I don't notice much of a change in drivability, other than the boost seems more "aggressive" (which is a side effect of there being more of it). It's not at all jerkey or harsh, but it does throw you back in the seat a bit more which is exactly what I wanted.

Also, I know this isn't exactly scientific but here is the M Laptimer app results for 0-60 times with Stock on top and Race on bottom.

Glad to hear that the drivability does not seem affected!

Do you have a manual transmission?

while that is a good decrease in your 0 to 60 time, I think you should be much quicker than that. I only used that lap timer couple times over the winter and I was getting 4.4 seconds. I do have xdrive though...

Pat

[leeadam]

Im having my car on rolling road in about 2 hours time...its 23 degrees in Uk so not as bad..hopefully will be interesting to see if any gains with racechip.

[leeadam]

well i paid £200 and now getting a 50bhp increase with Racechip...im impressed car drives smooth still and no issues at all. Its not even set to highest setting.
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