I have another question on the topic.

Why TDV6 has this 193 km/h limit? And the exact same limit exists even with the new 245 HP engine.

Why, if it's not a power issue, the TDV8 has 210 km/h limit. with only 20 HP more power?

Is something that has to do with tyres, weight (but then again TDV8 weighs more)? 2009 Range Rover Sport 2.7 TDV6 SE, Alaska White, Almond leather, tinted windows, active rear diff, tow pack, HiICE, full spare: gone and already missed

2004 Fiat Panda 1.2 Climbing 4x4
http://www.youtube.com/watch?v=fAg4DdXAp7Y

Alias wrote:

I think the GPS is not so exact.
Has somebody tried with a SC? LR says the mac of the SC ist 225km/h. I think the gasoline consumption will be around 50l/100km.

diamond wrote:

I have another question on the topic.

Why TDV6 has this 193 km/h limit? And the exact same limit exists even with the new 245 HP engine.

Why, if it's not a power issue, the TDV8 has 210 km/h limit. with only 20 HP more power?

Is something that has to do with tyres, weight (but then again TDV8 weighs more)?

gianluca wrote:

Good question Diamond.
I do not think it is related to tyres, since the load index and the speed index of our tyres can well withstand such performances.

Maybe brakes? But what about the versions with Brembo, though?

I thought the speed limit for both S/C and TDV8 was 130mph/kph???. But having checked, S/C is limited to 140mph.

Thought it was due to the weight of the car and risk of tyres shredding. That's what Jeremy Clarkson said on Top Gear back in 2005 anyway.

The in ECU set speedlimit for a TDV6 RRS is 200KMH or 124.27MPH.

The speed limit is set inside the ECU in KMH on all model cars weather it be a MPH or KMH instrument cluster.

There are also some Torque based limits depending on the vehicle speed.

One is if the engine gets to 4100rpm it will reduce torque, which inturn reduces max speed,
along with things that reduce torque depending on the speed of the car "TQVSLIM: Vehicle speed limitation" .

EG at 188KMH the ecu does not produce any more torque than needed to keep it at that speed.

at 188KMH the ecu will tell the engine to produce 50NM more than it needs to keep it at 188
at 181KMH the ecu will tell the engine to produce 180NM more than it needs to keep it at that speed which keeps the car pulling untill it gets to the next step.

Etc Etc


Basicly ina nut shell the conditions of the car air temp engine temp fuel level etc all need to be correct to return some higher speeds from the car.

I hope that makes sence.


Pete Follow Us On Twitter @bellautos

Pete, I was waiting for your very interesting reply.

Speed limit wise, I understand the car should have stopped anyway at 200 km, right?
So if it stopped at 193 it means that there were some other boundary conditions that forced the torque to be reduced as you stated.

Is this what you mean?

My boundary conditions were full load car 4 people + luggage, fresh air (12 degrees) no wind, half tank, perfect water temperature, vehicle perfectly warmed up (referring to oil temp) but not stressed at all (after few relaxed 100 km/h miles driving).
Might have it been a matter of engine RPM?
With respect to this and to the remap, do you think that 193 km/h before and after the remap should be reached at the same level of RPM?
I think so, if tyres and gears are the same, but please give me your opinion on the matter.

If positive, does it mean that a remapped car can reached higher speeds simply moving the maximum RPM range to a higher level?

Hope I was not too confusing in doing my questions, but I am really interested in this, also from the technical point of view...and you are the man for the answer.

bellautos wrote:

The in ECU set speedlimit for a TDV6 RRS is 200KMH or 124.27MPH.

The speed limit is set inside the ECU in KMH on all model cars weather it be a MPH or KMH instrument cluster.

There are also some Torque based limits depending on the vehicle speed.

One is if the engine gets to 4100rpm it will reduce torque, which inturn reduces max speed,
along with things that reduce torque depending on the speed of the car "TQVSLIM: Vehicle speed limitation" .

EG at 188KMH the ecu does not produce any more torque than needed to keep it at that speed.
at 188KMH the ecu will tell the engine to produce 255.156NM of torque or 50 more than it needs to keep it at 188
at 181KMH the ecu will tell the engine to produce 374.969NM of torque or 180 more than it needs to keep it at that speed.

Etc Etc


Basicly ina nut shell the conditions of the car air temp engine temp fuel level etc all need to be correct to return some higher speeds from the car.

I hope that makes sence.


Pete

HI

200KMH is the cars MAX peed limit if conditions are all perfect, it does not mean it will reach that speed every time you try,but in theroy yes 200 it should reach if all is perfect.

Yes it does sound like another boundry/limit in your case, these can in some cases be removed also BUT its not only the boundry that would be removed its the saftey of that boundry itself which in some cases in not good or adivsed, as seen below.

EG "MFTQLM: Torque factor for oil temperature protection" which also reduces torque when the oil gets hotter than it likes.
There are namymany things that can affect max speed, it would take me to long to explane them all , and some of the info i dont want to share on a open forum with other tuners if possibile.

A remapped can does not always reach thehigher speeds just because the limit is rased.
The rpm wont change at 193kmh with or without the remap , this will stay the same because the gearing of the box and axles finaly determins the speed V rpm not the remap.
With a remap we can not make the car drive at a lower rpm for a given speed, this is mechanical in the gearing.

Pete Follow Us On Twitter @bellautos

Perfect Pete.
So I understand from your message that if I want to keep my car's engine safe and sound, i do not have to remove this speed limit ...

 My gallery: http://www.rrsport.co.uk/gallery/thumbnails.php?album=994

That call is yours, i can only tell you how the ecu works and what it looks for when giving its max speed calculation.

I remove if asked the 200kmh limit on the remaps i do , but there are still other limits and saftey factors that are not removed unless asked for spacificly.

Pete Follow Us On Twitter @bellautos

bellautos wrote:

That call is yours, i can only tell you how the ecu works and what it looks for when giving its max speed calculation.

I remove if asked the 200kmh limit on the remaps i do , but there are still other limits and saftey factors that are not removed unless asked for spacificly.

Pete

...interesting..  My gallery: http://www.rrsport.co.uk/gallery/thumbnails.php?album=994

Do you want them removing from yours ?
In most cases it's not needed but I would assume the conditions that your car experienced over rides the speed limit of 200 or 255=off and still limited the cars max speed


Pete. Follow Us On Twitter @bellautos

Pete you got a message  2009 Range Rover Sport 2.7 TDV6 SE, Alaska White, Almond leather, tinted windows, active rear diff, tow pack, HiICE, full spare: gone and already missed

2004 Fiat Panda 1.2 Climbing 4x4
http://www.youtube.com/watch?v=fAg4DdXAp7Y

i sent email reply m8.


Pete Follow Us On Twitter @bellautos

The TDV8 can drive faster because it have Brembo breaks. The SC can driver faster because they have bigger breaks. The rear breaks are bigger than of the TDV8.
I think the other problem is the tyre. I think the TDV8 and SC have better tyres?