06-18-2020, 09:45 AM | #111 | |
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With the SSK I've experimented shifting randomly between 4 & 6k rpm and conditional that the shift is fast (likely faster than I could do with the oem shifter) I have no lag, immediate power enough to light the traction control light going into 2nd and even 3rd (damp road). Now I aim to shift 5-5.5k. |
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06-18-2020, 10:47 AM | #112 | |
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06-18-2020, 12:01 PM | #113 | ||
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A suggestion where to start before diving in the deep end: Perform the Teach-In (recalibration) Procedure for the Gear Position Sensor as required when replacing the DME (or in this case flashing new maps to it). If the neutral position is out of sync, it will leave the wastegate open for up to 2 seconds following pedal tip-in. |
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06-18-2020, 12:33 PM | #114 | |
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Also this aligns to my experience, in that I first really noticed this issue following an ISTEP update. I put the additional lag down to the new ECU tune, but all this time it was just a re-calibration issue (fingers crossed!). Thanks so much for the mega advice!!! |
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06-18-2020, 12:52 PM | #115 | ||
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Out of curiosity, did you do the iStep update or a dealer? |
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06-18-2020, 12:55 PM | #116 | |
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06-18-2020, 01:08 PM | #117 | ||
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Also want to add a suggestion to the US members coding "Euro MDM". Put it back as it doesn't do what most think it does. |
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ZPrime611.50 |
06-18-2020, 01:36 PM | #118 |
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06-18-2020, 01:43 PM | #119 | |
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06-18-2020, 01:45 PM | #120 |
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06-18-2020, 02:52 PM | #121 | ||
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Thanks widetyres for alerting me to the updates...
I have a copy of ISTA+ and E-Sys. I also have updated my I-Step myself a few months back (using E-Sys). My car is a 2018 LCI N55 and it had some updates shortly after purchase because of the dash recall. When I updated the I-Step, E-Sys calculates the modules that need updating and DME was not one of them. I can't remember what was now, but DME certainly wasn't. Quote:
Technically the Wastegate doesn't stay open for 2 seconds, it actually stays at either 80% or at the point it was at before the shift. It also isn't open for 2 seconds following pedal tip-in, it's for 2 seconds following pedal lift off. Nevertheless it's certainly something to try. The issue I'm having is that going all through ISTA+, I cannot find any information on this calibration ration. I searched the ISTA+ pages for information on manual gearbox and DME replacement and those don't mention it, and then did a text search for 'Teach In', which showed some results for DCT, but not for manual. Quote:
Are you also suggesting that Euro MDM may allow more slip as we've found, but also has some other side effects? Thanks for your help by the way lemetier.
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06-18-2020, 03:18 PM | #122 | |
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"The adjustment is performed using the "Service Function" of the BMW Diagnosis System (learn/write gear sensor)." I don't have ISTA but am on the case and will have a try tomorrow night. |
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06-18-2020, 08:11 PM | #123 |
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Reading this thread last night made me paranoid that I wasn't in tune with my car if this was happening and I had never noticed. So I went for a drive today looking for it, and it's not there on my car.
I live in the country, so there are plenty of roads for me to do testing (drive erratically) on. I just kept going from 15-65mph and back down again, 2nd through 5th. I shifted at 3000 rpm, 4000 rpm, and 6000 rpm. I shifted quickly, and so slow it felt weird. I did it all in comfort mode and sport+. Not one time did the car hesitate when I pressed the throttle. I'm not making this post to say you guys that are experiencing these things aren't feeling what you're feeling, but I don't think that what you are feeling was programmed or intended by BMW. I think going down the path of learning sensors is a good bet. I imagine something in the car has learned bad habits.
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06-19-2020, 02:24 AM | #124 | ||
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06-19-2020, 12:25 PM | #125 |
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OK guys, I did this in ISTA+...
I'm sorry I couldn't find it before when I looked; you have to actually be connected to the car to get the list of service functions to populate correctly. They do populate without being connected, but in my case at least, only auto gearbox things are listed there and that all changes when you are connected. In any case, the teach in for zero sensor module, or whatever it's called, has both a test and a reset option. I first tested mine, and found zero to be set at 50%. 1st and 2nd gear are then tested as well and this also showed as being within limits. So according to ISTA+, I didn't need to do a 'teach-in', but I did it anyway. The result of the 'teach-in' however was... 50%... just as it was before. I haven't driven the car yet but I don't expect any difference to be made unfortunately.
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06-19-2020, 12:45 PM | #126 |
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In trying to find out why I couldn't see the Manual Gearbox option in ISTA+, I ended up looking at the Tech training PDF (I was looking for the Gearbox unit number, which wasn't there). While reading the headline section about drivetrain, I find the following that I found interesting:
Engine speed adaptation for a gear change (double clutch)We all know that this document has several errors, but I did some more digging and found (from RealOEM) that the new gear sensor point is indeed true... the part on our manual gearbox is unique to the M2, M3 and M4. Other manual 2er, 3er and 4er cars do not have this sensor! The second thing that caught my eye was the two stage clutch switch comment. Looking at the info for this part in ISTA+ I can see that it is true that the sensor is two stage. Here's the quote: The clutch module's signal is employed as an input signal for the automatic engine start-stop function. 2 conditions are recognised:If true, this could be a problem... I have the ultimate clutch pedal installed, and before that I had the BMS clutch stop. If the DME is not getting the 90% signal, could this cause the delayed issue? ISTA+ does give you the feedback of the clutch sensor when you're doing the zero-gear learn-in, but it doesn't give you the two stages, only 1. In my opinion the clutch position sensor theory is a long shot, and though it's annoying, I'm tempted to put the stock clutch pedal and stop back in to test it. Can any of those who are claiming they don't have this issue comment on if they have the UCP or BMS stop at all?
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06-19-2020, 01:01 PM | #127 | |
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06-19-2020, 03:03 PM | #128 | |
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06-19-2020, 03:35 PM | #129 |
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I believe there is. Unfortunately it’s a feature I really like... it makes daily driving a manual fun without being a chore.
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06-19-2020, 06:38 PM | #130 |
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06-19-2020, 06:58 PM | #131 | |
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06-20-2020, 02:54 AM | #132 | |
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Also, from what I have read when previously looking into modifying the clutch for this, BMWs have been running two stage clutch signals for >10 years (ever since they moved to the magnetic clutch position sensor), so it is not M2 specific. Re the two signals from the clutch, only one goes to the DME (see diagram). FEM is responsible for the auto stop/start function, so it is most logically receiving the 90% position signal (for the clutch down before start). The DME is only getting the 10% signal; this is so that it can control hill start and other clutch assistance related functions. |
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