155mph speed limiter question

[Pondrew]

Are all cars limited to 155mph, even if they are not capable of reaching the speed; ie is it a generic part of the software regardless of whether it's needed?
Or for cars that can't reach the speed is it not "activated" or present?

 

[Nictrix]

Are you thinking along the lines of your car originally would not hit 155 but after the remap it might be capable , so if its now capable would it not have originally been fitted with a limiter so top speed may be higher?

 

[Pondrew]

Are you thinking along the lines of your car originally would not hit 155 but after the remap it might be capable , so if its now capable would it not have originally been fitted with a limiter so top speed may be higher?

Maybe! Just something I thought of earlier as 'hypothetical' and would be interesting to know. I admit I do think of the strangest things. The 18i is down as top speed of 137, 20i as 146, 28i as 155. They go up in increments of 9mph, so don't know if even the 28 has a limiter.

Therefore, if the N20s don't have an electronic limiter, a remapped 18i or 20i with more power than a standard 28i is theoretically the fastest Z4 ever made!

 

[Nictrix]

Your just going to have to find somewhere to test out your theory :driving:

 

[Pondrew]

Your just going to have to find somewhere to test out your theory

I'm trying to. Here! :lol:

 

[Smartbear]

Your just going to have to find somewhere to test out your theory

I'm trying to. Here! :lol:

Evolve remove the top speed limiter on their maps, I’ve never exceeded 70mph of course
Rob

 

[Pondrew]

Evolve remove the top speed limiter on their maps, I’ve never exceeded 70mph of course

But do the 18i and 20i have a limiter from factory, when not required, that's my question?

 

[Smartbear]

Evolve remove the top speed limiter on their maps, I’ve never exceeded 70mph of course

But do the 18i and 20i have a limiter from factory, when not required, that's my question?

I should think so, otherwise Evolve wouldn’t have to remove it
Rob

 

[Smartbear]

https://www.evolveautomotive.com/makes/bmw/bmw-z4/bmw-z4-e89-2009-on/bmw-z4-e89-2009-on-20i/bmw-z4-e89-2009-on-20i-ecu-tuning/evolve-ecu-remap-performance-upgrade-bmw-e89-z4-20i.html
Rob

 

[Mr Tidy]

So it looks like they all have the limiter regardless of whether they will get to 155mph!

I remember a similar topic regarding E85/86s and someone said the limiter only activates when the car is in 6th gear. If E89s are the same a manual one should get past that speed in 5th, always assuming it hasn't run out of revs.

 

[Argyll Andy]

So it looks like they all have the limiter regardless of whether they will get to 155mph!

I remember a similar topic regarding E85/86s and someone said the limiter only activates when the car is in 6th gear. If E89s are the same a manual one should get past that speed in 5th, always assuming it hasn't run out of revs.

And in the DCT 35iS’s could you drive it in manual and use the six gears if theoretically the limiter only engages in top gear (7th)

The other thing I remember while researching the G29’s is that someone from the uk had theirs on the autobahn and gps reading was something like 164mph for a car that allegedly has a speed limited to 155 mph

 

[Pondrew]

So it looks like they all have the limiter regardless of whether they will get to 155mph!

Oh boll*cks! I was only asking for bragging rights in the pub (assuming I ever get inside a pub ever again).

Still I could always just make it up. As my old dad used to tell me "never let the truth get in the way of a good story"

 

[Argyll Andy]

So it looks like they all have the limiter regardless of whether they will get to 155mph!

Oh boll*cks! I was only asking for bragging rights in the pub (assuming I ever get inside a pub ever again).

And assuming you still have a Z4 at that point that can’t officially break the 155mph limit

 

[Mr Tidy]

And in the DCT 35iS’s could you drive it in manual and use the six gears if theoretically the limiter only engages in top gear (7th)

The other thing I remember while researching the G29’s is that someone from the uk had theirs on the autobahn and gps reading was something like 164mph for a car that allegedly has a speed limited to 155 mph

Maybe the G29 owner was doing something similar!

Anyway who is going to be the first on here to test the theory? Unless soemone already has.

Apologies to Pondrew, but at least pubs are now open again!

 

[mcbutler]

Any mapping outlet can remove the 155mph limiter from your ECU, give celtic tuning a ring and they will tell you if you have a limiter on the ECU straight away

 

[Pondrew]

Apologies to Pondrew, but at least pubs are now open again!

Yes Mr T. I know. Doesn't mean I want to go in one anytime soon.
Maybe bragging rights with a loud hailer outside is the order of the day?

 

[Mr Tidy]

Yes Mr T. I know. Doesn't mean I want to go in one anytime soon.
Maybe bragging rights with a loud hailer outside is the order of the day?

Just go with a smoker - they'd be quite happy outside! :lol:

 

[Nictrix]

A lot of bikes with digital speedos stop at 186mph even though it will still pull past this.
Im sure 186mph is 299kph

 

[Colin_E]

Nah, keep the limiter & invent your own hypothetical top speed. Who's gonna prove you wrong down the pub anyway? My remapped N20 is good for n+5mph (where n is the professed top speed of my mates car )

 

[Anonymous]

The limiters function on road speed as perceived by the DSC unit..

On most cars max speed is hit in one or two lower gears than top which is a fuel efficient overdrive..

On a 20i auto top speed in 6th is 160mph..in 7th it’s 191mph

So deristricted and re-mapped top speed will be fall between the two gears…probably..