|
|
|
01-17-2009, 08:16 PM | #1 |
Banned
224
Rep 3,094
Posts |
Piggyback Question
I've been wondering since the piggybacks fool the car with intake temps and various things does it also fool the ecu into thinking the car is traveling at a different speed than it actually is?
Can or is the speed limiter bypassed because the ecu thinks the car is traveling at 80mph when in reality its going 180?? |
01-17-2009, 08:25 PM | #2 |
Brigadier General
295
Rep 3,350
Posts |
I think they fool the car's temperature and altitude reading. They tell the computer that the car is at sea level and cold temp. So they probably don't work as well if the car is really at sea level and is already in cold weather.
I also don't think that piggybacks change the speed limiter, I believe you need an ecu hack for that. |
Appreciate
0
|
01-17-2009, 08:55 PM | #3 |
Banned
76
Rep 5,970
Posts |
As far as I know the JB3 doesn't alter the limiter, but I haven't had a chance to find out. Just going by the signals it tapped into, I'm not sure how it could.
If the ECU thinks you're going slower than you actually are, it would probably screw up the speedometer and OD. |
Appreciate
0
|
01-17-2009, 09:34 PM | #4 |
Major
77
Rep 1,027
Posts |
I read that the ECU get speed readings from 4 separate sources <wheel sensor, transmission sensor, engine speed sensor, differential sensor..> somethings like that..so most piggybacks CANNOT override them without throwing codes..i know it sucks doesn't it...
__________________
M Sport Line Estoril Blue
|
Appreciate
0
|
01-17-2009, 10:43 PM | #5 |
Banned
224
Rep 3,094
Posts |
Actually I asked because I was told by someone that on a dyno the vehicle speed was very different based on dyno readings versus what the ecu was showing. As in the ecu was showing much lower which can cause problems if stability controls attempt to correct something and the ecu thinks your going half the speed you actually are.
I just wanted to know how accurate that information is |
Appreciate
0
|
01-17-2009, 11:52 PM | #6 | |
Second Lieutenant
16
Rep 204
Posts |
Quote:
__________________
I am Sam, Sam I am 2008 BMW 135i- AFE, HKS, EFX, Ultimate Racing, Split Second, CryO2 and Riss Racing |
|
Appreciate
0
|
01-18-2009, 04:15 AM | #8 | |
1736
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
Quote:
Maximum GPS verified speeds have been 187mph. If I was driving that fast, I wouldn't be thinking about warranty risks. I'd have other concerns on my mind Shiv |
|
Appreciate
0
|
01-18-2009, 04:44 AM | #9 | |
Private First Class
6
Rep 136
Posts |
Quote:
Although will it happen.........? :bs: |
|
Appreciate
0
|
01-18-2009, 11:42 AM | #10 | |
Private First Class
18
Rep 149
Posts |
Quote:
you know that the issue isn't whether it has yet been detected at the dealership level. I think the issue is that it probably could if a PUMA case gets filed and BMW digs into the raw data to see the inconsistencies between the different sensors. Can't vehicle speed can be determined in various ways, not just by the speed sensor? Seems reasonable that one can determine final speed by correlating rpm in a given gear to equate with a mph calculation which would then conflict with the clamped speed sensor signal. "just because you don't get a limp code when you alter the CPS, dummy the solenoids, or clamp 1/3 of the speed inputs, doesn't mean BMW/PUMA can't easily spot those variances on the back end." Smoke and mirrors indeed! |
|
Appreciate
0
|
01-18-2009, 12:01 PM | #11 | |
1736
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
Quote:
shiv |
|
Appreciate
0
|
01-18-2009, 12:06 PM | #12 |
Captain
210
Rep 959
Posts |
I don't any tune , I don't have a car yet lol , so could explain this comment a bit more?
__________________
|
Appreciate
0
|
01-18-2009, 12:12 PM | #13 | |
1736
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
Quote:
Shiv |
|
Appreciate
0
|
01-18-2009, 12:13 PM | #14 | |
BMWCCA #401908
54
Rep 470
Posts |
Quote:
But why are you so angy?
__________________
Vishnu PROcede v3, Vishnu Dual Cone Intake, Code3 FMIC, Riss Racing Downpipes, Riss Racing Exhaust, H&R Sport Springs Best 1/4 mile: 12.583 @ 117.609 mph |
|
Appreciate
0
|
01-18-2009, 12:17 PM | #15 | |
Private First Class
18
Rep 149
Posts |
Quote:
Like the one I mention about taking rpm and gear readings to extrapolate mph. Are you insinuating via your "non-responsive and hollow answer" that the DME does not record these items? |
|
Appreciate
0
|
01-18-2009, 12:21 PM | #16 |
Banned
224
Rep 3,094
Posts |
Thats exactly what I was saying. Im not concerned with dealer detection or warranties getting voided. Im concerned with what the stability control system will do and the final outcome when the ecu thinks the car is going 80mph and in reality its going 180mph.
|
Appreciate
0
|
01-18-2009, 12:26 PM | #17 |
Private First Class
18
Rep 149
Posts |
Different sensor signals deal with stability control, so the two should not conflict
|
Appreciate
0
|
01-18-2009, 12:27 PM | #18 | |
1736
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
Quote:
Shiv |
|
Appreciate
0
|
01-18-2009, 12:31 PM | #19 | |
1736
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
Quote:
Shiv |
|
Appreciate
0
|
01-18-2009, 02:23 PM | #20 |
Major
77
Rep 1,027
Posts |
please show me how...
__________________
M Sport Line Estoril Blue
|
Appreciate
0
|
01-18-2009, 03:51 PM | #21 | |
Private First Class
18
Rep 149
Posts |
Quote:
I have a difficult time imagining that if the engine throws a code or limp mode, that something as fundamental as what gear you are in at the time is not recorded. Some of us drive the steptronic AT and we know for a fact that we cannot accidently choose a gear that would cause the engine to over-rev. That tells me that the DME is monitoring what gear you are in at all times and whether a chosen dowshift is plausible or not. If it's not plausible it won't let you. But please, can you provide the evidence that your knowledge of fasta data recording is based upon when you state that only rpm and mph is recorded? Are you really that fully informed about how BMW stores those codes and the sets of associated raw data. It's kind of like the X-files...."I want to believe" what you say so why not show it in black and white? |
|
Appreciate
0
|
01-18-2009, 05:16 PM | #22 |
1736
Rep 17,960
Posts
Drives: A Lot
Join Date: Sep 2006
Location: SF Bay, CA
iTrader: (0)
Garage List 2018 Ducati Panigal ... [0.00]
2016 Mazda CX5 [0.00] 2017 Aprilia Tuono ... [0.00] 2019 BMW M2 Competi ... [0.00] 2015 BMW M5 Competi ... [10.00] 2016 Ducati XDiavel S [0.00] 2016 AMG GT S [0.00] 2011 Ferrari 458 It ... [0.00] 2017 Charger Hellcat [0.00] 2015 KTM Super Duke ... [0.00] 2016 KTM RC390 [0.00] |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|