The Range Racer
Discussion
BFleming said:
aaron_2000 said:
MrBig said:
Usget said:
They're too cool for us now they've been on Jalopnik....
Or been paid for exclusivity rights 
Or do you mean in the current economic climate with poor sales and a questionable UK advertising campaign
Munter said:
I can't imagine JLR are unhappy with their employees playing about with JLR products.
Or do you mean in the current economic climate with poor sales and a questionable UK advertising campaign
I was more going for the announced job losses in the last few weeks.Or do you mean in the current economic climate with poor sales and a questionable UK advertising campaign
https://www.bbc.co.uk/news/business-46822706
BTW the L322 isn't a JLR product.
We are back! Sorry it's been so long since the last update, we haven't had the time we would like to spend on it recently, hoping for that to change now.
We managed to get a few things done last weekend.
First thing was to plan some intake modifications, currently the intake comes in though a winding path though the wing, then over the top of the hot engine before dropping down the back into the super charger. Our plan is to have some sort or scoop into the back of the engine bay where we will have a filter, ruling out the need for the over the engine route! To make some space we will also need to move the battery to the boot which is probably a good idea anyway.
To plan for space we had to take off the HVAC filter and tray. My gosh this is soooo heavy so that's going to go too!
We also managed to take off the front door cards, side rails and also put the old dash frame back in to give us something to mount switches etc too, it's only plastic so it doesn't weight too much.
We then took the beast for a spin (videos will be on YouTube), tried to turn off the traction control by disconnecting the ABS module, it works........but then wont allow you to get out of first gear.....back to the drawing board.
We have also been having a think about tuning out our understeer......this will follow in a post soon once I've worked out how to properly explain it!
We managed to get a few things done last weekend.
First thing was to plan some intake modifications, currently the intake comes in though a winding path though the wing, then over the top of the hot engine before dropping down the back into the super charger. Our plan is to have some sort or scoop into the back of the engine bay where we will have a filter, ruling out the need for the over the engine route! To make some space we will also need to move the battery to the boot which is probably a good idea anyway.
To plan for space we had to take off the HVAC filter and tray. My gosh this is soooo heavy so that's going to go too!
We also managed to take off the front door cards, side rails and also put the old dash frame back in to give us something to mount switches etc too, it's only plastic so it doesn't weight too much.
We then took the beast for a spin (videos will be on YouTube), tried to turn off the traction control by disconnecting the ABS module, it works........but then wont allow you to get out of first gear.....back to the drawing board.
We have also been having a think about tuning out our understeer......this will follow in a post soon once I've worked out how to properly explain it!
charlie-5mkmt said:
We have also been having a think about tuning out our understeer......this will follow in a post soon once I've worked out how to properly explain it!
I fair bit can be achieved by adjusting the driving. If you look at the youtube footage of the Disco at The Ring, after a while he's slightly flicking the car going into the bends using the weight to counteract the understeer.Do you know Ryan Cook at JLR? He has a spaceframed Evoke bodied car.
Understeer......This is going to get a little deep, stay with us.
So the key tunable to help remove under-steer is roll stiffness,
Simplistically:
high roll stiffness = high weight transfer during corning = less total grip across that axle.
So an extremely oversteer biased car would have low front roll stiffness and high stiffness at the rear.
Roll stiffness is largely made up of 3 things (in order of influence): anti roll bars, coil/air springs & all the bushes in the axle. Hence the usual way of changing roll stiffness is though the anti roll bars.
In our application this is more of a challenge, our anti roll bars are already as big as will fit on the rear and we dont really want to put a smaller one on the front, with a CoG as high as ours (we will be back to roll issues). So.....we are back to looking at springs.....at here lies the slightly unconventional idea...
So in almost all cars there are actually 2 springs per corner, the spring itself (coil or air) and the spring aid or bump stop. The bump stops usually have a gap so it doesn't start to get compressed until the wheel has raised towards the body by approx 20-50mm. (spring aid is the pale coloured foam component inside the coil spring)
So interestingly the spring aid also has a rising rate as it is compressed (exponential) rather than a usually a coil or air spring which is "closer" to linear.
Anyway, back to the car, when we lowered the car, we used up all that gap and have partly compressed the spring aid, this results in a much stiffer feeling car and is mainly what helped is reduce our roll so much!
If we were to change the amount we have lowered the car, we can change how much the spring aid is compressed and hence change our roll stiffness!! As the spring aids are exponential, we shouldn't have to change the ride height much to make large changes.
And there you go, a very long winded way to say....we can tune our understeer by slightly tweaking our ride height (lifting the front and lowering the back should give us less understeer)
You are also all correct with suggesting things like wider front tyres & front to rear weight distribution however we expect these to have a smaller affect overall. (we will likely play around with all)
So the key tunable to help remove under-steer is roll stiffness,
Simplistically:
high roll stiffness = high weight transfer during corning = less total grip across that axle.
So an extremely oversteer biased car would have low front roll stiffness and high stiffness at the rear.
Roll stiffness is largely made up of 3 things (in order of influence): anti roll bars, coil/air springs & all the bushes in the axle. Hence the usual way of changing roll stiffness is though the anti roll bars.
In our application this is more of a challenge, our anti roll bars are already as big as will fit on the rear and we dont really want to put a smaller one on the front, with a CoG as high as ours (we will be back to roll issues). So.....we are back to looking at springs.....at here lies the slightly unconventional idea...
So in almost all cars there are actually 2 springs per corner, the spring itself (coil or air) and the spring aid or bump stop. The bump stops usually have a gap so it doesn't start to get compressed until the wheel has raised towards the body by approx 20-50mm. (spring aid is the pale coloured foam component inside the coil spring)
So interestingly the spring aid also has a rising rate as it is compressed (exponential) rather than a usually a coil or air spring which is "closer" to linear.
Anyway, back to the car, when we lowered the car, we used up all that gap and have partly compressed the spring aid, this results in a much stiffer feeling car and is mainly what helped is reduce our roll so much!
If we were to change the amount we have lowered the car, we can change how much the spring aid is compressed and hence change our roll stiffness!! As the spring aids are exponential, we shouldn't have to change the ride height much to make large changes.
And there you go, a very long winded way to say....we can tune our understeer by slightly tweaking our ride height (lifting the front and lowering the back should give us less understeer)
You are also all correct with suggesting things like wider front tyres & front to rear weight distribution however we expect these to have a smaller affect overall. (we will likely play around with all)
Gassing Station | Readers' Cars | Top of Page | What's New | My Stuff