155mph speed limiter question

Pondrew · Post by **Pondrew** » Tue May 25, 2021 6:58 pm

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 · Post by **Nictrix** » Tue May 25, 2021 7:02 pm

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 · Post by **Pondrew** » Tue May 25, 2021 7:19 pm

Nictrix wrote: ↑Tue May 25, 2021 7:02 pm 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 · Post by **Nictrix** » Tue May 25, 2021 7:23 pm

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

Pondrew · Post by **Pondrew** » Tue May 25, 2021 7:34 pm

Nictrix wrote: ↑Tue May 25, 2021 7:23 pm Your just going to have to find somewhere to test out your theory

I'm trying to. Here!

Smartbear · Post by **Smartbear** » Tue May 25, 2021 7:39 pm

Pondrew wrote: ↑Tue May 25, 2021 7:34 pm
Nictrix wrote: ↑Tue May 25, 2021 7:23 pm Your just going to have to find somewhere to test out your theory
I'm trying to. Here!

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

Rob

Pondrew · Post by **Pondrew** » Tue May 25, 2021 7:47 pm

Smartbear wrote: ↑Tue May 25, 2021 7:39 pm 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 · Post by **Smartbear** » Tue May 25, 2021 7:48 pm

Pondrew wrote: ↑Tue May 25, 2021 7:47 pm
Smartbear wrote: ↑Tue May 25, 2021 7:39 pm 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 · Post by **Smartbear** » Tue May 25, 2021 7:51 pm

https://www.evolveautomotive.com/makes/ ... 4-20i.html
Rob

Mr Tidy · Post by **Mr Tidy** » Tue May 25, 2021 7:58 pm

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 · Post by **Argyll Andy** » Tue May 25, 2021 8:15 pm

Mr Tidy wrote: ↑Tue May 25, 2021 7:58 pm 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 · Post by **Pondrew** » Tue May 25, 2021 8:20 pm

Mr Tidy wrote: ↑Tue May 25, 2021 7:58 pm 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 · Post by **Argyll Andy** » Tue May 25, 2021 8:22 pm

Pondrew wrote: ↑Tue May 25, 2021 8:20 pm
Mr Tidy wrote: ↑Tue May 25, 2021 7:58 pm 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 · Post by **Mr Tidy** » Tue May 25, 2021 8:24 pm

Argyll Andy wrote: ↑Tue May 25, 2021 8:15 pm 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 · Post by **mcbutler** » Tue May 25, 2021 8:36 pm

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

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