08-15-2019, 12:55 PM | #45 | |
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I've performed this reset and it seems to help for a while until relearning it's sluggish ways due to stop and go city driving. |
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08-16-2019, 05:40 PM | #46 |
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I've complained ad nauseam about this and how the X3 4-banger loaners I've gotten feel so much more responsive, when daily driven, down low (what most people do everyday). The mppsk tune on the M40i uses "overboost" on kick-down to thrust you forward & give the almost immediate sensation of brutal torque/speed but it's not practical in everyday driving. Otherwise, it feels lazy on any gear below 3K when cruising.
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08-20-2019, 07:29 AM | #47 | |
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2019 BMW X3 xDrive M40i - Alpine White
2019 BMW X7 xDrive 40i - Carbon Black (POS - Sold) 2019 BMW X5 xDrive 40i - Mineral White (Sold) 2018 RRS Autobiography - Fuji White (Sold) 2016 BMW M2 - Long Beach Blue (Sold) |
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08-27-2019, 09:35 AM | #48 | |
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08-27-2019, 10:00 AM | #49 | ||
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No matter what mode I'm in, in 1st gear at a stop, there's 2 seconds before it unleashes. I'm curious what a pedal tuner would do. I know that Dtuk makes them for our cars. Scroll down a bit and you'll see it called "Pedal box". https://www.diesel-performance.co.uk...w-2998-ccm/#go |
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08-27-2019, 01:52 PM | #50 | |
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08-27-2019, 02:01 PM | #51 | |
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Last edited by Alias1431; 08-27-2019 at 04:10 PM.. |
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08-27-2019, 02:04 PM | #52 |
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I agree completely. My 2 Acuras can be downright scary sometimes with the lag. They have plenty of power, but what the hell are they thinking about in those 1-2 seconds while the guy in the 80,000 lbs truck is closing in on me? If I put my TLX in sport, it's better, but not great. If I put it in sport plus, I control the gear and there is never an issue. But I don't like commuting in sport plus. And these are both non-turbo. Whoever is programming these vehicles with the lag between throttle and action is going to get someone killed. A CVT is better than my TLX.
Remember the old days without any computers? Floor it and go. |
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08-27-2019, 02:26 PM | #53 |
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You know oddly for me, its better in sport mode, but still rough some days. What I think I have sorted out is that if AC is on, its laggy. When AC is off, its great in sport individual. For the past few days it has been cooler so I have had the AC off, and it was a different vehicle completely. It was always itching to go! Today it was hot again so I turned AC back on, and even in sport there is the lag. I even have the lag in sport plus or with manual shifting. Oh well, still a great vehicle, just a nag.
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2019 BMW X3 xDrive M40i - Alpine White
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08-27-2019, 03:23 PM | #54 |
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This is a good tip, even in sport modes. Its as if the car assumes sharp throttle input from a stop is a mistake that can cause a crash so it adds this large delay to the car's response to allow for a correction before take off. At least that is my best guess as to why the car behaves this way. I believe its happening by design and isn't a result of turbo lag or some other mechanical flaw.
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08-27-2019, 04:13 PM | #55 |
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08-27-2019, 06:13 PM | #56 |
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08-28-2019, 12:39 AM | #57 | |
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Drives: X3 G01 30i xDrive
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08-28-2019, 05:55 AM | #58 | |
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08-29-2019, 04:06 AM | #60 |
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Maybe this has been brought up before....in case not:
What fuel are the folks running who experience lag? The 40i engine needs something like 98 / 99 octane fuel if the knock sensor isn't to rob you of 30hp+. When the knock sensor is operating maybe it changes the engine mapping which end up creating lag? |
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08-29-2019, 06:44 AM | #61 | |
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Major difference!
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08-29-2019, 09:15 AM | #62 | |
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08-29-2019, 09:40 AM | #63 | |
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Standard E5 95 Octane gas or Supreme E10 98 Octane gas If you let you car Chiptune, they also advise to fill up with E10/98 Octane for best engine results and HP/NM gain.
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08-29-2019, 10:01 AM | #64 |
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Yes....the high octanes are in Europe. 95 is standard with 97 / 98 / 99 being very available too, the exact rating depending on brand.
Edit...I just read that US 91 equates to European 97. That explains it. |
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08-29-2019, 11:07 PM | #65 |
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So 93 US octane is equal to 99 European I assume? Then it makes more sense now! So off European numbers, all members here are using the same high octane gas here in the US. But yes, lower octane gas will cause a loss of horsepower and engine knocking in extreme circumstances. If you can afford an M40i, don’t skimp on the gas. If you do, any throttle issues you truly deserve imo. I only use Shell premium whenever possible and no issues here in Comfort, fingers crossed.
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08-30-2019, 03:59 AM | #66 |
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The m40i motor is truly spectacular, but in my opinion it does have a bit of lag in comfort mode when accelerating from a dead stop. The first meter is pretty slow (definitely does not feel like 360hp) but then it takes off like crazy, which can be very dangerous at times. In this respect, the diesel version is more responsive in the low rev range which is exactly what I love and expect from a powerful car.
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