09-04-2013, 03:07 AM | #1 |
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sport display: how does it work?
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09-04-2013, 03:40 AM | #2 |
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09-04-2013, 08:30 AM | #3 |
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09-04-2013, 08:34 AM | #4 |
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Drives: '14 F30 335i M-Sport
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Interesting.
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09-04-2013, 05:34 PM | #7 |
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does it really need to measure the output in order to be accurate? Hasn't engineering reached the point where you can calculate something like power output based on a set of given input parameters?
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09-04-2013, 05:46 PM | #8 |
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You can predict relatively well I think to a degree. From memory, aircraft engines use about 0.45 lb/hp/hr so basically you can work out the power produced based on fuel rate. But it's still ballpark, because atmospheric conditions will play a part.
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09-04-2013, 05:46 PM | #9 |
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Here is my take on this. I have heard 2 PPK installs. When I first bought the car I had no PPK. My gauges showed 320/320. At no time did those sport displays show me exceeding 300/300. Never.
I then had my PPK installed in April and my gauges showed 320/400. At that stage my hp would max out and my tq never exceeded 332. Now I just got my PPK reinstalled today with the new DME and my gauges show 400/400. My hp peaked at 335 today, exactly 335, not even 340, which would have been cool. I think these displays are pre programmed but they use some smart algorithms to determine what to spit out. If you install your own tune outside of the BMW ecosystem the gauges will not work because its outside the parameters set in those algorithms. I think within the defined parameters from BMW the displays show you information that is reasonably accurate. Notice I did not say accurate, but accurate within reason
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09-05-2013, 02:44 AM | #11 |
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[QUOTE=300hp;14614027]Now I just got my PPK reinstalled today with the new DME and my gauges show 400/400. My hp peaked at 335 today, exactly 335, not even 340, which would have been cool./QUOTE]
Good news! Couple questions.... Was there a problem with your original MPPK? Did you feel any more power with updated MPPK? Was there a charge for this? |
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09-05-2013, 06:25 AM | #12 | |
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[QUOTE=BL 5]
Quote:
http://www.f30post.com/forums/showthread.php?t=879819 I still need more sit time before I can say this new set up is faster than the old. 15hp over 320 of the same may be tough to pick up from a butt dyno.
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09-05-2013, 08:46 AM | #13 |
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This is a fair assumption, as is your thought the gauges are a fair approximation of what is going on.
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09-07-2013, 06:28 AM | #14 | |
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Ha ha, just kidding. The dyno won't lie, looking forward to seeing those results. |
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09-07-2013, 02:22 PM | #15 | ||
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Quote:
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09-07-2013, 07:43 PM | #16 |
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After numerous tests today I can confirm I do not have the new PPK. Full throttle, 6800rpm yielded 320hp all the time. Only once did the hp go to 335hp. Only twice has it gone to 335hp since I got the car on Wednesday.
It's good to know on some random occasion I can get 335hp (assuming its not a software error), but it's a leap of faith for me to think this is the new PPK. 320hp is all I have under my control, the extra 15 comes and goes as it pleases.
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09-07-2013, 09:28 PM | #17 |
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Please do not base your conclusion on the silly sport display. It is not measuring anything, it is a pre-programmed guestimation.
If you really want to know what the car does, put it on a solid, real dyno and check. |
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09-08-2013, 07:07 AM | #18 | |
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However nothing beats dyno results and since we are still waiting the launch control videos, I expect it will be a long wait for the dyno results.
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09-08-2013, 08:59 AM | #20 | |
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I am hoping the rest of the physics gurus, like drob can also chime in. Maybe he is busy face palming himself on the s4 vs 335i thread.
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09-08-2013, 09:11 AM | #21 | |
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Calculating horsepower and torque is going to be, at best, an estimate based on a large number of variables none of which are measurements of power. For example, throttle position is only that - it only indirectly indicates the power which may be produced. Then there is the variability of mass produced engines. Having seen many "identical" cars on the same dyno produce significantly different results (but consistent with the same car), I know there is no generic engine parameter we can measure to accurately predict a given engine's power. The sport displays can reasonable be expected to read within plus or minus 10%, but I am afraid this is about as good as they can get. |
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09-08-2013, 09:16 AM | #22 | ||
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The sport displays can only be indicative but cannot be said to be accurate due to the variables you indicated.
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