02-06-2014, 01:31 PM | #67 |
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Oh - right... that acronym is already taken! lol
RS Worx looks to be pretty close-by - I'll check 'em out... Thanks JV!
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02-06-2014, 03:59 PM | #68 |
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They did my install for under $400, but I am yet to have an alignment though its on my to-do list after winter.
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02-06-2014, 10:08 PM | #69 | |
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02-11-2014, 03:13 PM | #70 | |
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In the stock calibration (and with the stock sport springs) the ride allows for a bit more body roll than most of us like, but with better springs (and most likely even more so with re-mapped damping curves via Shockware), I'm hoping these dampers will really shine.
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02-11-2014, 07:30 PM | #71 | |
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06-19-2015, 05:31 PM | #72 | |||
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Yes, the statement "stiffer springs resist weight transfer" is not correct. It's actually the exact opposite. I'm not sure what I was thinking when I wrote it, other than that it was not really the central point of my post and I kind of just put that in there as a segway without any real thought (Oops!). For that post, I should have said was that stiffer suspension has some benefits to laptimes and handling and left it at that. Anway, Here's a better go at explaining stiffness vs. weight transfer. Quote:
You are also correct that, in steady state cornering, the total amount of lateral weight transfer is independent of suspension stiffness. But, the front to rear distribution of the weight transfer does depend on suspension stiffness. (In this situation, I'm basically reffering to roll stiffness via springs and bars.) Key point: Quote:
Sitting still: 1000lbs 1000lbs 1000lbs 1000lbs During a left turn: 500lbs 1500lbs 500lbs 1500lbs You've transferred 500lbs in the front, and 500lbs in the rear, and lost the same amount of grip in the front as you have at the rear. The balance of the car is neutral. If you then increase the REAR roll stiffness of this same car, you will still have the same 1000lbs total weight transfer, but the front to rear distribution will not be equal any more. You might have something like this: Left turn with stiffer rear springs: 700lbs 1300lbs 300lbs 1700lbs <-- stiffer springs = more transfer in the rear Now, the front tires have 400lbs difference left to right, and the rear tires have 1400lbs difference left to right. You have now lost MORE grip in the rear than in the front, and made the car oversteer. If you were to increase the front stiffness instead, you would now have an understeering car. This is basically the mechanism by which you tune for oversteer/understeer with springs and bars. Sorry it took me 2 years to get back to you!
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06-20-2015, 09:24 AM | #73 | |
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If we agree to slightly modify your above example to something like this, we are fully on the same page Left turn with stiffer rear springs:PS: Just nitpicking to nag you
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06-20-2015, 11:00 AM | #74 |
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Nah, thanks for keeping me honest.
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01-31-2016, 09:24 PM | #75 |
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Hey Racer20! Great insight into the M Adaptive Suspension!!
I have. 2015 428i with M Adaptive Suspension, how would you know if it was performing to specs, or performing at all? Is there a way of testing this? I know when I move from Comfort to Sport Mode, the Springs do get tighter, and the car definitely is more stiff and responsive. But just wondering how smooth of a ride it is supposed to give? Also, noticed that I have to keep my tires (runflats) inflated to their highest spec (5 passengers and luggage PSI) in order for me to get the most compliant ride. Otherwise I get a really "bouncy" type of ride.
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01-31-2016, 09:55 PM | #76 | |
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If you are getting a bouncy ride, think about getting Dinan Shockware. I upgraded my 2014 328i with Adaptive Suspension last year and I couldn't be happier. Before Dinan Shockware, my Comfort mode was horrible. It was bouncy or porpoise-like. Sport mode was less so, but still annoying. I was always reaching for the mode switch the moment I got into the car to get the heck out of the awful Comfort mode. THEN, I got the Dinan Shockware upgrade. It transformed the car. No more bouncy. No more porpoise-like ride. Comfort feels like Sport mode should. Sport mode is even tighter. Comfort is now so good I only change to Sport when I am feeling extra sporty Read about Dinan Shockware and see if its some you would consider. Note that it is not springs or hardware; it's it a software update. Good luck! |
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02-05-2016, 05:36 AM | #77 | |
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My Ride! : 2015 428i GC (F36) - MSport, Alpine, Black Leather, MBrakes, Adaptive, Sport Seats, Hex. Alum w/Piano, HK Sound, 400m's, Comfort Acc. When I’m not Driving: https://youtube.com/shorts/ViKD_Hj5htE?feature=share
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02-15-2016, 12:07 PM | #78 |
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new 340i suspension VS F30 Adaptive
Hello Racer,
Am seeking some answers as to the improvements BMW made to the F30 suspension- in particular the front- and how does it compare to the fully equipped F30 with Adaptive M? Although I have experiences occasional minor understeer and maybe even roll, is the difference significant enough to
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02-16-2016, 04:02 AM | #79 |
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I want to add in something as to the comfort level of the suspensions. I had a 2013 F30 335i Sport Line, and recently sold it and Purchased a 2015 335i with the Adaptive M Suspension.
My 2013 had 18" OEM Wheels and Stock Pirelli P7 Run Flats My 2015 has 19" OEM Wheels and Stock Bridgestone Run Flats. I have to say that the difference in the comfort of the ride is definitely noticeable and much improved with the M Adaptive Suspension. I don't feel like my stomach is going to come out of my mouth everytime I hit a pothole, which is how I felt on my 2013 with the M Sport Suspension (Passive) I may look into getting the Dinan Shockware for it. Are there any other companies that "Tune" the M Adaptive Suspension? I'm assuming the tune is only software related and nothing changes as far as the hardware goes?
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02-16-2016, 09:37 AM | #80 |
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08-21-2022, 03:49 PM | #81 |
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Racer20
I know this is an old thread but im a bit desperate for a solution so if by an off chance someone can give me bit of an advice would be grateful. I have F15 with Adaptive Chassis around 8 months ago my shocks gone stiff out of blue, used to drive very smoothly. I replaced all accelerometers, ICM and VDC units, ride height calibration, edc, icm start up, steering angle calibration, software updates, flashed control units back on but no luck. (flashing ICM helped but lasted a day or 2) It has no warning lights, no fault codes and been to 3 different garages one main dealer and 2 specialists. One of the thinks car is normal as its an Msport but the car used to be really comfortable, and ride used to be really smooth. Its now crashy and some days unbearable and occasionally it will sort it self out for a short period but this is now very rare and might last half a mile or 10 miles. Something throwing the data this uses to tell shocks to stiffen up but what is it i cant find. a Any advice small or big would be appreciated |
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08-22-2022, 01:26 PM | #83 |
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Its 2016 X5, on another forum someone had same problem, they still had the problem after changing all 4 shocks but then he replied saying the problem was the shock and replacing the faulty one resolved the issue. I measured all the valves when the car is turned off and they all read 2 to 2,2 ohms i cannot remember where i read but supposedly thats what they should read. Is there anyway to diagnose the shocks? |
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08-23-2022, 01:16 AM | #84 | |
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You mentioned the ride height sensors have been re-calibrated. Front and rear? Testing them isn't that hard in that you can park the car on a hill with the engine and headlights on. The headlights should point in the forward direction of the vehicle. Another approach is to disconnect all sensors and dampers (the car will throw multiple codes). Attach one damper, test, then attach a sensor, test. The idea here is you are testing not only the sensor but whether there is a short to any part of the system causing it to go haywire. The next step is to check the wiring. To do this properly though, an oscilloscope would be a fantastic tool to help. Unfortunately, such tools are not cheap. Seek out an automotive electronics expert who can sniff the CAN bus for random garbage rather than a regular signal expected. Most mechanics, including the dealer, often do not have the experience or tools to properly do such diagnosis so it's not a surprise to hear the shops you visited missed it. You may have to seek out a specialist. Another possibility is rusted or broken pin on a connector. You'll need to check all related modules and each connector to it, including the connectors to each damper. Rusted pins will generate inconsistent results and broken pins will shutdown parts of a system. Generally in vehicles with a sun roof (like the X5) there will be a drain that passes from top to bottom for the water to exit. If the drain pipe cracks, water or high levels of condensation end up in electronically sensitive areas. In general, when you check any module, pull out it's connectors and look for rust or broken pins. BMW sells connector pin repair kits for a reason. It's not a shock to see a dead pin, at least on a BMW. Good luck.
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08-23-2022, 01:18 PM | #85 | |
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I think you are absolutely spot on about car using substitute values due to information not available. Unfortunately, the only thing i haven’t change is BDC (Body Domain Controller) and Ride height sensors and front shock absorbers. BDC is above ICM from hierarchy point of view so I think it is related but not part of the system. And to change BDC you will need to involve immobiliser and all sorts but module responses fine and communicates fine and no fault codes against it, and given it controls a lot of modules I think I would have had bigger problems if that had an issue. As for the ride height, ISTA guides you through it, you park it at level surface, measure the distance between edge of rim and fender and you put those in to the tables ISTA asking you to do it and it adjusts it self. I can communicate with each ride height sensor and can see they are showing the ride height and headlights adjusts themselves like you said. I checked all the connections to the shocks and the accelerometers ( accelerometers changed anyway) and they are all clean. Connection to Electronic Height Controller and VDC, ICM are also all clean. Im struggling to find a good technician who can actually diagnose flex ray communication. I thought of buying an oscilloscope to read signal but unfortunately even if I invest in one I don’t have a good wave form to compare to see if its how it should be. You are right about main dealers too, i spoke to another one today local to my workplace and service adviser struggled to understand there still could be a fault with car even if there is no fault codes. Their attitude towards it that no codes no problem. One chap who were in same situation said it was a faulty shock but how one goes diagnosing it as the only thing electronic is the valve. Last edited by F15er; 08-23-2022 at 01:33 PM.. |
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08-23-2022, 02:14 PM | #86 |
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I'm struggling to find a good technician who can actually diagnose flex ray communication. I thought of buying an oscilloscope to read signal but unfortunately even if I invest in one I don’t have a good wave form to compare to see if its how it should be.
FlexRay on the F15? I thought that was only on the 7 series but it makes sense all cars are moving from CANBUS. You will need someone with experience though. A few videos on YouTube show there are a lot of differences in signal so someone who can differentiate treasure from trash may be worth the cost. You are right about main dealers too, i spoke to another one today local to my workplace and service adviser struggled to understand there still could be a fault with car even if there is no fault codes. Their attitude towards it that no codes no problem. A lot of auto systems tend to work independently to ensure one doesn't trash the other if they fault. Could BMW have installed parts so new they had no APIs on the diagnosis side to read back errors? Perhaps. What the version of iDrive you are running and is there an update? Or, the shock simply isn't sophisticated enough to send back an error. It's valve open. Valve closed. One chap who were in same situation said it was a faulty shock but how one goes diagnosing it as the only thing electronic is the valve. Guessing, I could imagine 4 pins for the damper. Power, ground, activate (open/close), and state (open/closed) but maybe state could be done in the third pin. The 4 may share a common ground, so if one pin is shorted out on any damper, none of them work. You may be able to test this by unplugging all 4 dampers, being sure to zip tie connectors if lose. You don't want then caught in the wheel during testing. Connect one damper and see the result. Nothing happens? Unplug that damper (because the first damper may be the faulty one) and try another. For the next test, try the damper on the opposite wheel but same axle. Ideally you will find a pair of dampers on the same axle, making it easier to tell if the ride quality is changing. I know on the Bilstein EDC dampers, they had a problem with the connector housing cracking and had a recall. Could this be a similar issue?
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08-23-2022, 02:53 PM | #87 |
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Yeah FlexRay is utilised for comms between VDC (aka EDC) and ICM and the accelerometers but cant remember what else exactly.
I am going to try some auto electricians locally to see if any of them wants to tackle the job. Car is runing on Idrive 4 but Ilevel is up to date, I tried flashing it on Sunday (just reinstall of latest version) but made no difference. I unplugged the front right valve about half an our ago as i never tried that before and car thrown up an error straight away so it knows when one is unplugged, it is only twisted pair to the shock so i believe one is ground and other is voltage. Scanned the car to see what repair ISTA will suggest after i unplugged the valve and read following statement on system function description. "Fail Safe Depending on the type of fault that has occurred, the fail safe takes effect in 3 stages: Stage 1: substitute values if for example the signal from lateral acceleration sensor is not available, other parameters are used as substitute values for the identification of cornering. The driver does NOT receive a Check Control message: no fault entry (only a slight loss of comfort is perceptible)" I think this is exactly going on with my car given everything i gone through and the fact that there are no fault codes. Other stages will display check message and will go medium to hard comfort and i experienced that by unplugging one of the accelerometers and that feels like driving a tractor plus car complains about chassis restriction. I had the rear shocks replaced with some low mileage ones ( they were only done 2.5k miles) and that made things worse as they had less wear where my original shocks already done 80k so they were more worn thus softer. I put my originals back after suffering 3-4 months as the back axle was unbearable stiff. I believe dampers are made by Tenneco or Monroe. |
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08-25-2022, 08:56 AM | #88 | |
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Maybe the newer Keysight scopes have the data frame definitions for Flexray? The ones we use at work have defs for most other comms, you just tell it what kind of signal you're reading and it parses out the frames automatically. Then again, ours are in the $5k range so they're not cost effective to buy for this, but maybe you could grab one from Electrorent for a few weeks/months to sort it out? |
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