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      06-04-2020, 05:14 PM   #1
samuelbpereira
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Accelerator pedal delay

Hello, does anyone know if in bimmercode you can remove the accelerator delay and make it more sensitive when stepping? When you step it takes a long time to answer. BMW X1 25i 2019
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      06-04-2020, 08:15 PM   #2
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see this thread on the F39 forum

https://f48.bimmerpost.com/forums/sh....php?t=1633575
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      06-05-2020, 05:08 AM   #3
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No one has yet figured out how or if the delay can be changed by coding. It doesn’t do it when you put the transmission in sport mode (M/S) so that can be a temporary workaround.
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      06-05-2020, 06:35 AM   #4
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Sorry a bit late to the party. I just noticed this thread.
No matter what people say about the problem not being Turbo Lag, after reading all the posts in this thread, there is no doubt in my mind the description of Turbo Lag fits the scenario for many people.
If people care to look on other forums, it happens a lot with the Audi Q5 TFSI (252 bhp UK version) and by being in Sport mode the Lag disappears. Many other 4 cylinder very efficient Gasoline (Petrol)Turbo engines have this problem. So the solution adopted was when waiting to join the traffic flow we always changed to Sport mode. This mapping appears to keep the turbo spinning fast enough to make the throttle pedal more responsive for a quick getaway. Once up to speed in traffic, we changed back to Eco pro/comfort.
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Last edited by Peter_R; 06-05-2020 at 06:56 AM.. Reason: missed text
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      06-05-2020, 08:24 AM   #5
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Quote:
Originally Posted by Peter_R View Post
Sorry a bit late to the party. I just noticed this thread.
No matter what people say about the problem not being Turbo Lag, after reading all the posts in this thread, there is no doubt in my mind the description of Turbo Lag fits the scenario for many people.
If people care to look on other forums, it happens a lot with the Audi Q5 TFSI (252 bhp UK version) and by being in Sport mode the Lag disappears. Many other 4 cylinder very efficient Gasoline (Petrol)Turbo engines have this problem. So the solution adopted was when waiting to join the traffic flow we always changed to Sport mode. This mapping appears to keep the turbo spinning fast enough to make the throttle pedal more responsive for a quick getaway. Once up to speed in traffic, we changed back to Eco pro/comfort.
I went through the same deal when I first bought my car, wondering why there was a huge delay, and I agree with you now. The transmission disengaging is not what causes this problem, I'm already moving forward when the delay is a factor. Simply just out of the power band, and having the revs higher fully solves this problem. It's just a lazy little 4 banger down low, for emissions or efficiency I'm sure. I've fully adjusted to it and never feel like it causes me sketchy moments anymore. This is also why the pedal tuner doesn't fix anything, people say it's less pronounced but still present because they are simply throttling through those low rpms a hair faster. I dont know, this is just the conclusion I ended up coming to, and like I said it's fully not a problem for me now that I've adjusted to it.
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      06-05-2020, 08:36 AM   #6
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It's an issue that's been much discussed in BMW forums for a number of years, and it doesn't only affect four-cylinder models (e.g., it's there on the X3 M40i). The majority consensus seems to be that it's related to throttle and/or transmission programming, and this matches up with my experience on our X1.

I've also adjusted to it, but given that the behaviour can be entirely eliminated on the X1 by putting the transmission in M/S mode, it's nice to have the option to have the quick initial throttle response pulling away from a stop when you really need it.
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      06-05-2020, 09:20 AM   #7
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It is not just BMW that has the problem. It would be true to say that the majority of vehicle manufactures have this problem with Turbocharged engines in one form or another.
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      06-05-2020, 09:45 AM   #8
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I didn’t say it was just BMW, but we are speaking on a BMW forum about a BMW product. I’ve personally experienced something similar in certain VAG products from a base Golf on up to an Audi RS3, but throttle and powertrain programming issues aren’t specific to turbocharged vehicles. I’ve yet to drive a manual-transmission car that’s affected this way, and I plan to keep one in my garage as long as I can.
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      06-05-2020, 09:55 AM   #9
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Quote:
Originally Posted by kavatski View Post
I’ve yet to drive a manual-transmission car that’s affected this way, and I plan to keep one in my garage as long as I can.
Well, I have! I had a loaner the other day and the dealer agreed that it is not just auto gearbox vehicles that exhibit the anomaly. Note I said anomaly not problem. My daughter has a company VW T-roc and we found that we could induce it quite easily.
Once people understand how turbocharging works then they start to understand what is happening.
Thank you
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      06-05-2020, 10:15 AM   #10
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I’ll continue to respectfully disagree. I think those who understand how much software programming goes into determining how modern cars drive - to meet performance goals but also comfort, emissions, and fuel economy standards - would be able to see that the root cause lies in software. Fortunately, as I said, the X1 allows you to bypass the laggy throttle tip-in programming as long as you plan in advance!
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      06-05-2020, 10:26 AM   #11
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Quote:
Originally Posted by kavatski View Post
I’ll continue to respectfully disagree. I think those who understand how much software programming goes into determining how modern cars drive - to meet performance goals but also comfort, emissions, and fuel economy standards - would be able to see that the root cause lies in software. Fortunately, as I said, the X1 allows you to bypass the laggy throttle tip-in programming as long as you plan in advance!
I do not mind you disagreeing. Your prerogative.
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      06-05-2020, 10:53 AM   #12
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Quote:
Originally Posted by Peter_R View Post
I do not mind you disagreeing. Your prerogative.
Yes. The prerogative for each of us to have our own interpretation of the facts is something we can both appreciate in the current world climate.
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      06-05-2020, 11:49 AM   #13
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The twin scroll turbo in the 4 cylinder cars and especially the new modern turbocharged sports cars like those from Porsche and Mercedes have almost zero lag. The issue is that certain manufacturers including BMW use software ECU programming that favors a more comfortable approach to pedal sensitivity rather than abrupt instantaneous acceleration for safety reasons. There are ECU maps out there now that allow customization of this ECU "feature" to minimize the built in (software) lag. And in fact there are mapping tunes that work on BMW X1 B46 and B48 engines however not yet available for the X2 M35i. Drive safe everyone.
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      06-05-2020, 06:03 PM   #14
samuelbpereira
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Thanks to everyone for the comments and the tips, for what I saw just putting in sport mode to remove this delay from the accelerator, it will be a matter of custom.
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      06-06-2020, 06:47 AM   #15
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Quote:
Originally Posted by Xorbitman View Post
The twin scroll turbo in the 4 cylinder cars and especially the new modern turbocharged sports cars like those from Porsche and Mercedes have almost zero lag. The issue is that certain manufacturers including BMW use software ECU programming that favors a more comfortable approach to pedal sensitivity rather than abrupt instantaneous acceleration for safety reasons. There are ECU maps out there now that allow customization of this ECU "feature" to minimize the built in (software) lag. And in fact there are mapping tunes that work on BMW X1 B46 and B48 engines however not yet available for the X2 M35i. Drive safe everyone.
I agree with this. There's no discernible turbo lag in my 25i (=28i in the US), but throttle response — especially in Eco mode — is an issue, especially when combined with the Aisin A/T, which is quite a bit less responsive than the ZF8AT you'll find in 3 series with the same motor.

That said, neither are as bad as I've experienced with the various DSG transmissions in VAG products — they're getting better, but unless you make the key decision to change gears manually in certain slow traffic situations, where suddenly you need response (eg, roundabout entry), you can be left...er...wanting. That's because the transmission is less responsive. In the X1 25i, it's also because of slow throttle response in Eco and Comfort modes. "Sport" mode resolves this; so, too, will certain products: Sprint Booster is one — it says it does all sorts of things, but really all it (or any of them do) is change the throttle mapping in the ECU; you can actually achieve 90% of the same effect with a bigger shove on the accelerator pedal!

My solutions: 1. use manual shifts when you expect to need responsive acceleration; 3. Harder acceleration pedal pressures; or 3. Use "Sport" mode
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      05-18-2021, 11:56 AM   #16
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Burger Motorsports has a solution

Just ordered one after it being out of stock forever. People who own them say it works and it looks like a very simple installation.

BMS Pedal Tuner - Adjustable throttle response

https://burgertuning.com/products/bm...12095482953843

I love Burger's JB4, very easy installation as well. The JB4, a cold-air intake, as well as Bimmercode transmission = wow for the 2015 328ix. Can't wait to get this Pedal Tuner installed!
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