Chimaera rear ride height

[QBee]

Can anyone remind me please of the rear ride height, lower wishbone to floor?

I seem to remember it should be 155mm, but need to check before getting the G spanners out.
Yes, I am on adjustable dampers. It loooks a tad low to me, and clanged on a bump on a B road yesterday with nothing but the targa panel in the boot.

Trevorso Ta ever so in advance

[FunkyGibbon]

When Center Gravity set my car up rear axle ride height was 145mm (front 135mm)

[bobfather]

I've always set it at rear 155mm, front 145mm. Bottom wishbones horizontal at rest which is how the unequal wishbone suspension is designed to be

[QBee]

bobfather said:

I've always set it at rear 155mm, front 145mm. Bottom wishbones horizontal at rest which is how the unequal wishbone suspension is designed to be

Not doubting the poster above, thanks for the quick response and I know CG are well respected.
I was expecting a range of answers, all of them with merit.

But this chimes with me, Bobfather, in all respects.
I have always resisted setting mine lower, as I use the car a lot and do track days, where you want to optimise the high speed handling.
Too low at the rear can make the front somewhat floaty at 120-140 mph.
I will be turning into Coppice at Cadwell Park at 105 mph a week on Wednesday, so want to be confident it won't understeer, as I tend not to take spare underwear to track days.

[FunkyGibbon]

With regard to CG - I'm not sure what their reference point is for the measurement I could ask. Works for me, but I don't track mine, just roads and not that quickly

[QBee]

FunkyGibbon said:

With regard to CG - I'm not sure what their reference point is for the measurement I could ask. Works for me, but I don't track mine, just roads and not that quickly

Thanks, and your response is much appreciated, but no need to enquire further on my behalf.

I remember we had to set mine a tad higher than some - the forward lean of the car becomes markedly more important at higher speeds, and my car is on 17 inch wheels, so it is wearing 215/45 17 fronts and 235/45 17 rears for its road tyres.
That tyre set up gives some rake front to rear, but my R888R track tryes are 215/45 17 all round, so I do need to jack the rear up a tad more than normal
I am seeing Jools on Wednesday and will see if we can get it up on his 4 poster (lift, not bed ) when he has finished remapping it.

[KugaWestie]

I thought the ride height measurements were taken from the outer corners of the outriggers?

I am sure I have previously seen 155mm for the outer corner of the rear outrigger and 145mm for the outer corner of the front outrigger?

[FunkyGibbon]

I have checked with CR and this is how they measured the height of my chim..

CR said:

Chris said they measure from the floor to the corners of the chassis frame in front of the front wheel and behind the rear wheel - there is a little flat 'square' corner as it were which they use as their reference point.

[bobfather]

The setting, rear 155mm, front 145mm, is for original 15/16" wheels and OEM tyres. This is not about distance from road to chassis corners, it's about horizontal lower wishbones at rest. If you're on non-standard wheels then the factory measurements may incorrect. That said, I'm on factory 5 stud hubs and 16" Spiders all round, mine is still correct at rear 155mm, front 145mm

[Classic Chim]

The thing is the chassis outriggers can sag so take this as a reference more than gospel.
If one corner of your outriggers happens to be 6 mm higher then you lower that side down to get the outriggers even you now might have offset the weight. It’s a guide only.
The only accurate way to do this is by corner weighting the car so getting your weights even all round then mark your shocks for future reference.
The fact might be the outrigger corners could then all be different heights but if the weight on each wheel is correct the car is now balanced properly.