Hi all,

Looking at the gap between the rear wheel (rim edge) and the top of the wheel arch I noted the left hand side is bigger than the right!

Just to confirm that I wasn't going mad, I took a rule and measured between the top of the rim and the top of the wheel arch. Left hand side was approx. 120 mm and the right was 110.

Measurements wete taken with quarter of a tank of gas and after a good run again with a half tank on flat/level ground.

Any plausible reason for this?

 

Who's been riding around in your passenger seat?

 

Mine's within about 1/8".

 

Mine are both 80 mm. (H&W springs)

 

Mines on standard shocks, last used on softer mode in dynamici setup.

All gaps front and back are 11cm give or take a mm between the top of the rim and the top of the wheel arch, except for the passenger side L/h rear which is 12cm.

Seems a a bit odd.

 

I have no idea if it's applicable to the F type and I haven't measured mine but for interest's sake, some cars are designed like that. My Superbee has more leafs on the passenger side to counteract engine rotational forces that put more pressure on the right rear......common in drag racing....perhaps not in sportscars.

Dave

 

20 inch wheels, new Pirellis. 17MY V6 Coupé AWD 2700miles.
Height from ground to wheel arch...
F left 720mm
F right 710mm
R left 720mm
R right 720mm

 

I recently did a spring study at work regarding spring height variation. In a sample of 285 vehicles, there was a 18mm variation in overall spring height, which was within the acceptable tolerance for this vehicle. I imagine some variation combined with tolerance stack and other factors such as relative fuel tank location cause what you're seeing.

 

Thanks for that.

Mine are all 720mm from ground to wheel arch, except for the rear left which measures 730mm. That's also on 20" wheels shod with oem tyres on a rwd R.

My thinking is that 10mm may have been a bit far out of spec and possibly a rear coil spring not sat level in its cup?

Would the fuel tank not be laterally and longitudinally centrally balanced?

 

You're over thinking this. He just said he has the same "issue"...

 

I don't think so...I haven't noticed the rear left being higher before, hence my post.
Something may have changed which I would like to know about....that is, unless other cars are the same, in which case I would like to understand why.

 

You've never noticed the difference before or you've never measured to find out?

Also I told you why, build variation is a very real thing. Ride height is impossible to get consistent.

 

I believe the front arches can get askew if you close the bonnet wrong (from the side instead of front). I was showing my friend the engine when I first got the car and he decided to close the hood before I could stop it. Opened and close correctly, but one side needed to be adjusted (arch lines didn't line up well). Doesn't explain rear though

 

Measure it with the tank empty and then with the tank full. That will answer the tank location question.

 

But when you do, you'll have leave it for the same period of time to settle.

Here's my ride height after sitting for 24+ hours:

LF: 706mm
RF: 706mm
RR: 732mm
LR: 725mm

Pretty much tells you everything you need to know... wide variation.

 

2 mm difference isn't much. Oops, 10 mm. Shad over 3/8" though. Is there a spec for the tolerance by JLR or others? Were tires equally inflated?

 

For giggles;

LF: 718mm
RF: 718mm
RR: 725mm
LR: 727mm

.....garage floor isn't completely level, full tank of fuel, tire pressures should be close but could easily be off 1-2 PSI comparatively.

Dave

 

Sure is a variation; I'm surprised by this.

FWIW and for those that are interested, the fuel tank is pretty symmetrical:

 

Don't be surprised. This kind of variation is completely normal in the industry. As I said, in a study I did on my vehicle platform, there was a 17-18mm variation across a sample of the exact same vehicles, and this was within tolerance.

Also while the fuel tank is symmetrical, the fuel in the tank is not. Depending on fuel level, you may have a significant portion of fuel on one side in tanks like these. They do not balance out evenly.