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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > New AA Tune (2017 updated version)



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      04-13-2018, 10:27 AM   #111
hassmaschine
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You can change the parameters that cause it. It's definitely possible to tune for more power - how else do you think BPC made 500hp/tq with their N52 turbo?
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      04-13-2018, 10:46 AM   #112
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That's what I was thinking, so I don't understand why this is even an issue...
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      04-13-2018, 10:59 AM   #113
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Quote:
Originally Posted by atmosphericM View Post
It sounds like AA is nerfing the tune a bit to deal with the parameters, but I wish they would/could just change those parameters! It's sounding like these motors can make more power than BMW is comfortable with them making or something? To save the transmission? Hmm maybe the DME just doesn't like for the TQ to come on too quickly which the tunes are causing? Of course I don't know anything about these TQ parameters, but wouldn't someone that is boosted constantly trigger this limp mode? Odd indeed.
I'm guessing wildly but I do have some very pig heavy wheels that would have significant rotational inertia and may be causing the measured torque value to jump up above the limp mode threshold. I suppose it's also possible that this only happens at WOT in DS mode above 3500rpm, and only some of us routinely hit those levels enough to trigger the fault. The revised V3 tune they sent me to avoid the fault is definitely a little less edgy than the previous version I was running, and the fault frequency has been lower, but it needs to be eliminated completely.
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      04-13-2018, 11:01 AM   #114
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Quote:
Originally Posted by hassmaschine View Post
You can change the parameters that cause it. It's definitely possible to tune for more power - how else do you think BPC made 500hp/tq with their N52 turbo?
What's the point of the limiter anyhow? And why not just bump it up to something like 300wtq?
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      04-13-2018, 11:07 AM   #115
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the torque management system is just complicated. Modern DMEs don't really monitor "load" in the sense that they used to - everything is based on demanded/expected/actual torque.
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      04-13-2018, 11:11 AM   #116
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Quote:
Originally Posted by hassmaschine View Post
the torque management system is just complicated. Modern DMEs don't really monitor "load" in the sense that they used to - everything is based on demanded/expected/actual torque.
What I don't get it why BMW wouldn't just bump traction control a few times first before throwing a limp mode fault. The torque monitoring system is probably designed to prevent mechanical failure of the transmission or other driveline components but in this case the values were obviously set artificially low because 328.
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      04-13-2018, 11:13 AM   #117
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it's nothing to do with traction control. They knew what the engine output was when they tuned it - it's not a limiter exactly, it's more like the engine was tuned for a specific output, so that's what the expected torque table is looking for. If it's way outside the expected value the DME assumes something is wrong, because from the factory it would never be tuned that way without adjusting the expected values as well.
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      04-13-2018, 11:27 AM   #118
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Quote:
Originally Posted by tom.gnade View Post
because 328.
LOL I'm going to start using this.

It's starting to seem like AA needs to offer hass a contractor position lol. The dedication that a few of our members here have to our N/A community is, well, frankly pleasantly surprising and very-much-appreciated by myself as well as others for sure. I know it's a hobby of y'all's, but going out of your way and taking the time to share what you learn with others is a whole 'nother thing entirely. Humanity has hope! (Can you tell I had my coffee this am lol??)

Maybe this is why there is no steam in the AA MILVS tune pipeline... can you say constant limp mode?

Hmmm

Last edited by atmosphericM; 04-13-2018 at 11:42 AM.
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      04-13-2018, 12:25 PM   #119
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Hey guys....reading thru all the posts on this thread, should I be concerned with getting the new AA tune? I have my headers and will be installing soon. All this “ limp mode talk” has me a bit concerned. I haven’t had any issues with the AA v2 tune that I’m currently running with my mods.

Thanks for all the good info btw, it’s much appreciated!
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      04-13-2018, 12:51 PM   #120
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Quote:
Originally Posted by FlaPatsFan View Post
Hey guys....reading thru all the posts on this thread, should I be concerned with getting the new AA tune? I have my headers and will be installing soon. All this “ limp mode talk” has me a bit concerned. I haven’t had any issues with the AA v2 tune that I’m currently running with my mods.

Thanks for all the good info btw, it’s much appreciated!
I don’t think you should be concerned. It’s hit or miss. There is a lot of people running these tunes, and only handful reported any issues. I never had an issue with it. Had a code show up when I was on v2 of the tune right after the install, but it never caused the a limp mode. I briefly run this tune and other than o2 sensor codes, it didn’t cause any other codes.
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      04-13-2018, 07:33 PM   #121
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Just did my first event of the year, really liking the new AA “aggressive” tune. Nice low end torque (good for street) and pulls nicely through 7200.

http://www.e90post.com/forums/showpo...1&postcount=72
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      04-20-2018, 11:57 AM   #122
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I have this latest AA tune ands it been very solid for the past few months! Definitely an overall improvement from the previous one, noticeably a little more low end tq.

No issues so far!
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      04-20-2018, 12:26 PM   #123
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Quote:
Originally Posted by banshee28 View Post
I have this latest AA tune ands it been very solid for the past few months! Definitely an overall improvement from the previous one, noticeably a little more low end tq.

No issues so far!
Good to hear 👍
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      12-07-2018, 11:51 AM   #124
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Update.....been running AA headers with the latest AA tune and “Limp mode” is happening. Seems as if under hard acceleration is when limp mode occurs, usually over 4000rpms.

I get a whole bunch of traction control/brake lights on dash. Car drops to first gear and stays there until I shut car off the back on. Upon pulling codes “engine management interface” fault code shows up. Seems as if the TC is losing communication with the engine.

Anyone seen this or had this problem?
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      12-07-2018, 11:53 AM   #125
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Is it 2D59? - if so, it's not a connection loss, it's a flaw in the tune.
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      12-07-2018, 12:43 PM   #126
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Quote:
Originally Posted by hassmaschine View Post
Is it 2D59? - if so, it's not a connection loss, it's a flaw in the tune.
5E19 is code....im stumped on this one Hass.
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