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      01-13-2018, 09:37 AM   #1
bacampbe
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Recode speed limiter

The dealer has a car that is otherwise perfect, but has run-flats. They agreed to swap them for staggered MPSSs. I've asked if they could recode the speed limiter, and they are checking on that.

I seem to recall reading a while back that they could do this, but it had to be done before you hit a certain number of miles, after which it would be baked in forever (short of a reflash.)

Does anyone know for sure?

Thanks!

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      01-13-2018, 09:50 AM   #2
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highly doubtful.

The only way is if they car was driven under 10 miles.

Your best option is a flash tune, this will remove the speed limiter.
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      01-13-2018, 09:54 AM   #3
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Quote:
Originally Posted by bryan_f22 View Post
highly doubtful.

The only way is if they car was driven under 10 miles.

Your best option is a flash tune, this will remove the speed limiter.
I was afraid of that--its already got 19 miles on it. But are you sure it's 10 miles? Since I posted that I found posts in the tires and wheels forum that said 10 engine hours.
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      01-13-2018, 12:42 PM   #4
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Quote:
Originally Posted by bacampbe View Post
The dealer has a car that is otherwise perfect, but has run-flats. They agreed to swap them for staggered MPSSs. I've asked if they could recode the speed limiter, and they are checking on that.

I seem to recall reading a while back that they could do this, but it had to be done before you hit a certain number of miles, after which it would be baked in forever (short of a reflash.)

Does anyone know for sure?

Thanks!

Ben.
I can't think of any circumstance where you would hit 155 unless you live in Germany and drive on the autobahn. Not really a big deal IMO. It's more of a psychological thing.
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      01-13-2018, 02:17 PM   #5
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Quote:
Originally Posted by xantdieselx View Post
I can't think of any circumstance where you would hit 155 unless you live in Germany and drive on the autobahn. Not really a big deal IMO. It's more of a psychological thing.
It’s absolutely psychological. But if I discounted everything psychological, I’d be getting a Corolla :-)
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      01-13-2018, 03:58 PM   #6
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Quote:
Originally Posted by bacampbe View Post
Quote:
Originally Posted by xantdieselx View Post
I can't think of any circumstance where you would hit 155 unless you live in Germany and drive on the autobahn. Not really a big deal IMO. It's more of a psychological thing.
It’s absolutely psychological. But if I discounted everything psychological, I’d be getting a Corolla :-)
Lol good point.
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      01-13-2018, 04:45 PM   #7
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Not all cars with run flats are speed limited. Look up your vin http://www.bimmer.work

Look for code 840 High Speed Synchronisation
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      01-14-2018, 09:18 AM   #8
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Quote:
Originally Posted by 3rdcoast228i View Post
Not all cars with run flats are speed limited. Look up your vin http://www.bimmer.work

Look for code 840 High Speed Synchronisation
Wait, so if I am getting a car with non run flats its not speed limited?

On a side note, I am picking up my car at the Welt on an ED in May. If I drive it around the corner and recode it, you think this might work? Does Bimmercode have that function?
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      01-14-2018, 10:30 AM   #9
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My understanding is that you get higher speed limiter if you got performance summer tires; not just the MPSS, but also the runflats (mine were Conti 5's, but I think also a Pirelli option, or some other brand that is a RFT summer tire). I think all are staggered, but best to just look for the specific 840 code (mine was called "840 Increased top speed limiter").

I was told it had to be reset in the first 10 miles, but no reason to think it couldn't be via run time; I would assume your dealer will be motivated, so if it can be reset they should find out how - please let us know if it really is possible (that 10 miles rule has been repeatedly cited, but I'm sure many are hoping it isn't that final). Aftermarket flash tuning is wicked cool, if you like modding, but will cost you the warranty; and FWIW, I've heard mixed things about whether it can really be reset with a flash (some say it is a burned in part of the firmware, not part of the 'flash' code, hence the funky timeline).

Personally, I'd use it as a bargaining chip w/ the dealership, unless you plan to track it (or really drive on the autobahn). Just practice saying s/t like 'but it is only half the car it could have been - that should be worth ......'. Just don't buy the hype yourself, you won't miss it - 130 is not just felony level in all 50 states, it is 'beat you down and actually drag you to jail' in many areas.
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      01-14-2018, 01:07 PM   #10
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Quote:
Originally Posted by Maynard View Post
My understanding is that you get higher speed limiter if you got performance summer tires; not just the MPSS, but also the runflats (mine were Conti 5's, but I think also a Pirelli option, or some other brand that is a RFT summer tire). I think all are staggered, but best to just look for the specific 840 code (mine was called "840 Increased top speed limiter").

I was told it had to be reset in the first 10 miles, but no reason to think it couldn't be via run time; I would assume your dealer will be motivated, so if it can be reset they should find out how - please let us know if it really is possible (that 10 miles rule has been repeatedly cited, but I'm sure many are hoping it isn't that final). Aftermarket flash tuning is wicked cool, if you like modding, but will cost you the warranty; and FWIW, I've heard mixed things about whether it can really be reset with a flash (some say it is a burned in part of the firmware, not part of the 'flash' code, hence the funky timeline).

Personally, I'd use it as a bargaining chip w/ the dealership, unless you plan to track it (or really drive on the autobahn). Just practice saying s/t like 'but it is only half the car it could have been - that should be worth ......'. Just don't buy the hype yourself, you won't miss it - 130 is not just felony level in all 50 states, it is 'beat you down and actually drag you to jail' in many areas.
Since I'm doing the ED, I will be on the autobahn. I've done 145mph on it before (230k) so wouldn't mind being able to up it past 155. Also, plan to do the Dinan Stage 1 later this year and the occasional track day.

Hoping I can find a way to do this myself! Dealer won't do it as I will have tons of km on it by the time the car gets to Canada after the ED.
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      01-14-2018, 01:35 PM   #11
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Quote:
Originally Posted by mike519 View Post
Since I'm doing the ED, I will be on the autobahn. I've done 145mph on it before (230k) so wouldn't mind being able to up it past 155. Also, plan to do the Dinan Stage 1 later this year and the occasional track day.

Hoping I can find a way to do this myself! Dealer won't do it as I will have tons of km on it by the time the car gets to Canada after the ED.
You need to make sure your car has option code 840 included in the build, if it hasn't been built for your ED yet. I don't think this is available if you have sped'd all-season tyres, but is included in several of the Canadian package combinations which include summer tyres. Best to get your dealer to print the full option spec for you, although if you already have the VIN, a VIN decoder can give you the option list.
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      01-14-2018, 04:29 PM   #12
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Quote:
Originally Posted by xantdieselx View Post
I can't think of any circumstance where you would hit 155 unless you live in Germany and drive on the autobahn. Not really a big deal IMO. It's more of a psychological thing.
Maybe not 155, but I was over 130 with mine at Watkins Glen. Who wants to see the limiter come on at 130 during a track day?
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      01-14-2018, 06:09 PM   #13
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Quote:
Originally Posted by mike519 View Post
Wait, so if I am getting a car with non run flats its not speed limited?

On a side note, I am picking up my car at the Welt on an ED in May. If I drive it around the corner and recode it, you think this might work? Does Bimmercode have that function?
It's still limited but to 155mph instead of 135mph
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      01-14-2018, 08:17 PM   #14
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Quote:
Originally Posted by pikcachu View Post
It's still limited but to 155mph instead of 135mph
Actually, the M240i is limited to 130 with run-flats and 149 without, at least according to the specs on the BMW USA site. But maybe the M235i had different limits?

https://www.bmwusa.com/vehicles/2-se...fications.html
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      01-14-2018, 08:28 PM   #15
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Only 149? That’s depressing.
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      01-14-2018, 08:36 PM   #16
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Quote:
Originally Posted by wjones14 View Post
Quote:
Originally Posted by pikcachu View Post
It's still limited but to 155mph instead of 135mph
Actually, the M240i is limited to 130 with run-flats and 149 without, at least according to the specs on the BMW USA site. But maybe the M235i had different limits?

https://www.bmwusa.com/vehicles/2-se...fications.html
Probably 130 real mph but speedo will top at 135 cause they read around 3-4 mph faster
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      01-14-2018, 09:01 PM   #17
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Proof that mine goes over 130.

It was a wet track, otherwise would have been higher.
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      01-14-2018, 09:48 PM   #18
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Quote:
Originally Posted by wjones14 View Post
Actually, the M240i is limited to 130 with run-flats and 149 without, at least according to the specs on the BMW USA site. But maybe the M235i had different limits?

https://www.bmwusa.com/vehicles/2-se...fications.html
In Canada, there are 4 wheel/tyre options on the M240i. The run-flat and non run-flat performance tyre options all have the “High speed maximum with performance tires (max speed increased from 210km/h to 250km/h)” option by default at no charge:

436M (orbit grey) with run-flat performance tires
436M with performance tires
461M (ferric grey) with non run-flat performance tires

Only the 436M with all-season tyres don’t have this option and it can’t be selected.
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      01-15-2018, 06:16 PM   #19
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I picked up a CPO 2015 m235i Xdrive back in October and found out the depressing way that my car was truly limited at 130 exactly with the Pirelli runflats it came with. This may differ from vehicles with other tires or coded differently but I speak for myself. After inquiring at my dealership as well as a couple tuners locally including Turner, the conclusion is that once 10 driving hours have passed it is not possible for the dealership to remove the governor without voiding the warranty.

As of about a month ago, I was told by all those sources above that it was only possible to remove the limiter by removing intake manifold and physically drilling into the ECU to remove the governor or tune our cars further. Now obviously with new coding methods it can be done thru the OBD2 port. However, I am sure it is still detectable if the dealership choses to get picky and discovers the alteration no matter how small a digital footprint it leaves.

Personally it stinks having a vehicle that accelerates this quickly yet is limited to 130 but I will wait until my warranty has expired to remove that limiter. Both side of the argument have valid points...130 is plenty fast for most as well as our roads here in the US not to mention the legal aspect. But I have new wheels with MPSS tires along with some suspension bolt-ons and do plan to see an occasional track day eventually, so will be nice to gain a bit on the straights.
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      01-15-2018, 07:15 PM   #20
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Quote:
Originally Posted by wjones14 View Post
Quote:
Originally Posted by xantdieselx View Post
I can't think of any circumstance where you would hit 155 unless you live in Germany and drive on the autobahn. Not really a big deal IMO. It's more of a psychological thing.
Maybe not 155, but I was over 130 with mine at Watkins Glen. Who wants to see the limiter come on at 130 during a track day?
I will accept that answer. If you track your car and are lucky enough to have a straight where you can make use of the 155 top speed it would be desirable. Closest track to me is NH Motor speedway where our cars would hit 120 on the straight.
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      02-22-2018, 01:56 PM   #21
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Denver Downtown has an orange 2018 M240i xdrive with the all season radials and I was wondering about that speed limiter. Got my answer on this thread, so it would be limited to 130. I have a 2015 235i xdrive that came with the all season run flats so it is limited too. I have never gone that fast to find out. I have been tempted to go test drive it but I am thinking the performance bump isn't going to be enough to warrant a new car payment.
https://www.bmwofdenverdowntown.com/...vdp-recentCars
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      04-12-2018, 08:27 AM   #22
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I've just purchased a new (Canadian market) M240i xDrive that I'll be taking delivery of next week. I haven't seen the car yet, but the dealer says it has all seasons on it. However, the VIN number reports that it has option code 840 (increased speed limiter). The VIN also reports "run flat" but doesn't explicitly say all season or performance tires.

Here's a VIN report of a similar car as an example: https://www.mdecoder.com/decode/vd60813

Assuming my car has all seasons, is the increased speed limit on run flats something that changed on 2018 M240i models? I know that the 2018 230i models with run flats don't have the increased limiter, as I checked their VINs and they didn't have the 840 option code.

Last edited by wizee; 04-13-2018 at 08:47 AM..
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