02-11-2014, 12:49 AM | #23 | ||
Major General
1718
Rep 5,110
Posts |
Quote:
But, yes the BMW setup probably uses a algorithm that gives you the "official numbers" and possibly not the real numbers... However if you buy an App that connects via Bluetooth to a OBD dongle you will probably get more realistic numbers... |
||
Appreciate
0
|
02-11-2014, 05:29 AM | #24 | |
General
21121
Rep 20,741
Posts
Drives: 2021 911 turbo
Join Date: Jan 2012
Location: Montreal
|
Quote:
IMO, fuel flow is probably a better way to estimate the base power output; and even then, figuring out the mixture and engine efficiency would only be gross estimates. The only way to precisely measure the engine output is to measure the actual torque the engine produces. I believe that the display is only a calculation based on a pre-established map and not on the actual engine output. |
|
Appreciate
0
|
02-11-2014, 07:42 AM | #26 | |
Major General
592
Rep 5,396
Posts |
Quote:
You know, you don't actually have to look at it if you don't want to?
__________________
|
|
Appreciate
0
|
02-11-2014, 07:48 AM | #27 |
Major
241
Rep 1,418
Posts |
|
Appreciate
0
|
02-11-2014, 09:15 AM | #28 | |
Major General
1718
Rep 5,110
Posts |
Quote:
Obviously the air flow is only a rough calculation as you actually also need to know the efficiency of the internal combustion engine. But I'm pretty sure BMW knows that I have done datalogging on BMW DI engines via the OBD port. Amazingly (or perhaps not ) a 150kW engine came up with a max airflow reading of exactly 150g/s... And if you look at TP (throttle position) at the same time you could even see that the fly by wire throttle varies it's opening (in %) to regulate air flow. Which is how (amongst other) a detuned version of a engine can be detuned these days. Like the N53 that comes in 204, 258 and 272hp Versions. It's the same basic engine, but on a 204hp version, the throttle position never goes above 40% in a WOT scenario. Under acceleration, with the accelerator just at the kick down point, the TP opens up to around 87,5% under high load and low to mid rpm, but then tapers back to 40% as revs increase to maintain a 150g/s air flow rate... However, the BMW Sports Display might not use real life data alone. BTW, would be interesting to do some datalogging on a F10 M5 to see if that engine has a maximum airflow that correlates to it's kW output... Last edited by Boss330; 02-11-2014 at 09:21 AM.. |
|
Appreciate
0
|
02-11-2014, 09:34 AM | #29 |
Colonel
107
Rep 1,997
Posts |
|
Appreciate
0
|
02-11-2014, 12:32 PM | #30 |
Law Enforcer
25143
Rep 22,291
Posts
Drives: '22 Chalk Gray Porsche C2S
Join Date: Jun 2006
Location: ..in your rearview!!!
|
|
Appreciate
0
|
03-09-2014, 09:55 AM | #31 |
Lieutenant
61
Rep 480
Posts |
Not about me looking at it - It's about other drivers not looking at the road, but looking at a display which is showing completely useless info while driving. What possible need could you have to see real time HP and TQ.?
|
Appreciate
0
|
03-09-2014, 08:12 PM | #32 | |
Brigadier General
672
Rep 4,959
Posts |
Quote:
Regardless, BMW has been incorporating more displays into the HUD to avoid precisely the situation you are worried about.
__________________
Current: '23 G20 M Sport 330i
Current: '20 X253 GLC300 SUV Gone: '20 W205 C43 Sedan Gone: '18 W205 C43 Sedan Gone: '13 W204 C63 Sedan |
|
Appreciate
0
|
03-09-2014, 08:23 PM | #33 |
Lieutenant
61
Rep 480
Posts |
Agreed. However you can always pull over if you need to program gps etc. can't really do that with real time hp/tq. In fact probably the only time most people will look at hp/tq is at WOT. Not really an ideal time to look away.
|
Appreciate
0
|
03-09-2014, 09:03 PM | #34 |
Brigadier General
672
Rep 4,959
Posts |
True. Although I do concede that navigation is more useful than an estimated torque/horsepower readout. On my old F30 M Sport 335i with the M Performance Power Kit, I had the "Sport Displays" but the readout was in the Euro. configuration. I was forced to look at Newton meters of torque and make the conversion to ft-lb.
__________________
Current: '23 G20 M Sport 330i
Current: '20 X253 GLC300 SUV Gone: '20 W205 C43 Sedan Gone: '18 W205 C43 Sedan Gone: '13 W204 C63 Sedan |
Appreciate
0
|
03-10-2014, 03:14 PM | #35 | |
Law Enforcer
25143
Rep 22,291
Posts
Drives: '22 Chalk Gray Porsche C2S
Join Date: Jun 2006
Location: ..in your rearview!!!
|
Quote:
|
|
Appreciate
0
|
03-10-2014, 09:12 PM | #36 |
Brigadier General
672
Rep 4,959
Posts |
I'm out in the sticks. I think I'm the only person in my State that knows what coding is (with respect to cars anyway).
I've done some coding and I'm pretty familiar with the Benz platform but I never really got a chance to do any coding with the BMW. I personally like the COMAND system in the Mercedes. It's basically a ripoff of iDrive. That said, the iDrive system is the best multimedia/infotainment system in existence today. I do miss the wider variety of things you can do with it. Mercedes has a second LCD cluster in the middle of the speedometer and you can do quite a bit with it. On the AMG menu, there are a few different screens (one is a pretty thorough lap timer; another shows what transmission/throttle program is selected and what suspension/traction control setup you have activated). The final screen shows you both the oil and coolant temperatures. Each temperature is displayed in blue (warm-up mode) until the fluids reach safe operating temperature (at which point they turn white). Every screen shows you what gear you have selected, regardless of whether the car is in C, S, S+, or M. This is the fluid temperature screen:
__________________
Current: '23 G20 M Sport 330i
Current: '20 X253 GLC300 SUV Gone: '20 W205 C43 Sedan Gone: '18 W205 C43 Sedan Gone: '13 W204 C63 Sedan |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|