Freel2.com - View topic - Gradient Release Control (GRC)


Forum-Gallery-Shop-Sponsors « Advertise on Freel2.com

Home · FAQ · New Posts · My Posts · PMs · Search · Members · Members Map · Calendar · Profile · Donate · Register · Log In

Home > Technical > Gradient Release Control (GRC) - Does yours work?

Page 3 of 3

Print this entire topic ·

rmbillington

Member Since: 28 Aug 2006
Location: Peterborough
Posts: 511

2007 Freelander 2 TD4 XS Manual Stornoway Grey

Found the trick, as the LRE guy showed me it in my own car.

You need to take your foot off the brake quickly, if you release slowly it doesn't kick in.

I was slightly embarrassed when I said it didn't work, so he offered to drive my car to test it, being very confident it would, and he did, first try.

Rich

23rd Oct 2009 11:30 am

zone30

Member Since: 20 Jan 2009
Location: OVL
Posts: 683

2009 Freelander 2 TD4_e XS Manual Santorini Black

Did he mention any angle?

24th Oct 2009 6:32 pm

rmbillington

Member Since: 28 Aug 2006
Location: Peterborough
Posts: 511

Yes

it is 20 degrees, which is approximately 20% or a 1 in 5 hill.

You still need to have it in M&R with HDC on.

Rich

25th Oct 2009 11:14 am

waaxh03

Member Since: 12 Mar 2007
Location: North Wales
Posts: 298

2007 Freelander 2 TD4 SE Manual Zermatt Silver

rmp wrote:
GRC works on hills of 18 degrees (which is 20%, where 100% = 45 degrees), either forwards or backwards, and HDC must be enabled.

I don't understand how 100% = 45 degrees. I would have thought 100% would = 90 degrees (vertical).
Could some one please explain

Thanks
waaxh03

25th Oct 2009 7:47 pm

rmp

Member Since: 07 Jan 2008
Location: Melbourne
Posts: 12

waaxh03 wrote:
rmp wrote:
GRC works on hills of 18 degrees (which is 20%, where 100% = 45 degrees), either forwards or backwards, and HDC must be enabled.

I don't understand how 100% = 45 degrees. I would have thought 100% would = 90 degrees (vertical).
Could some one please explain

Thanks
waaxh03

If 100%=90 degrees then you'd have 50%=45 degrees which would also be non-intuitive and you may as well use degrees.

http://en.wikipedia.org/wiki/Grade_%28slope%29

explains it well. The key point is that a rise of x in x, eg travel 100metres for a rise of x metres translates well to the percent. Vehicle manufacturers like to talk in percent because the ability to ascend a 100% gradient sounds impressive as not everyone realises that's 45 degrees. Incidentally Land Rovers are only rated for 100% gradients for short periods of time, not continuous. --
Robert

25th Oct 2009 8:31 pm

waaxh03

Member Since: 12 Mar 2007
Location: North Wales
Posts: 298

Thanks rmp'
I have learnt something today.

waaxh03

25th Oct 2009 8:35 pm

mikehzz

Member Since: 04 Sep 2009
Location: Springwood
Posts: 749

I had mine on nearly all day yesterday crawling up and down numerous steep, rutted and rocky fire trails (it was wet too). It really works well. If you leave it on and use the accelerator then it doesn't do anything, when you come to a steep section, just don't touch the pedals and it kicks in on its own. A bit of a trap when you think its on but its not....thats why I left it on. It turns on automatically for mud & ruts.

Mike

26th Oct 2009 12:30 am

rmbillington

Member Since: 28 Aug 2006
Location: Peterborough
Posts: 511

I have learnt something new as well, always thought 100% was 90degrees, and always thought it was stupid, because it'd be the same pretty much. Makes sens that 45degrees is 100%.

In which case, not certain if it was 20degrees or 20%, but should say in the manual.

Rich

26th Oct 2009 9:49 am

Page 3 of 3

All times are GMT

< Previous Topic | Next Topic >

Posting Rules

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum