Originally posted by 888_special
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Suspension..there, I've said it!
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I'm finding this all quite educational......
Since our little spring issue I have been looking into all things bounce as I've never been happy with Gracie's ride.
My findings on Gracie so far are:
After market green springs 40mm
(NSR spring broken)
Neither top or bottom rubber spring seats fitted  25mm
We have 18" rims with 40mm tires fitted 5mm from standard
So that's an accumulated 70mm with a full camper/rock 'n' roll/pop top.
That's my explanation for the apparent arch gap difference between Si's 50mm srpings & our 40mm springs.
It also highlights the fact that IMHO comparing piccies of vans is fun, but not too helpful unless you compare all of the other variables too.
What the photos are really good for is showing the look achievable, so you can set your desired target & then sort out the ride.
I like the height Gracie sits at (although level will be an improvement), but she doesn't like bumps AT ALL!
Front bangs over everything but matchsticks & the rear just, sort of donks.......
She's also pretty bouncy over ripples, so we have shock issues too.
So I'm now trying to arrive at a known point before working back to what I want, but with a sensible ride.
I intend to fit Bilstein B6's & probably 40mm Vogtland springs.
I also intend to add a poly top seat & fabricate a 10mm thick lower seat.
The overall effect of that should be to raise the rear by 10mm from it's current position.
So, after all that waffle I look forward to watching you go through the same process with your van.
I also invite plenty more education ladies & gents  this is all fascinating stuff.
One question I have right now  what's the advantage of the little shocks over the longer ones?
Presume it's not just that they're really cute......
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Unsure if this is related Tinc... but a mate is just in the process of swapping his Bilstein B6 shocks for Sachs HD because his rear springs keep unseating , which we think was down to the shocks length. It's resulted in a number of broken springs. Think he was at 50mm but not 100% sure of spring manufacturer.
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Originally posted by Tinc View PostWe have 18" rims with 40mm tires fitted 5mm from standard
.
I assume you mean 40 profile  not 40mm tyres.
Ride will be harsh on 40 profile tyres  which is why the ride is harsh on most vans with 18s  because of the tyre profile that people tend to run with 18s.
Top and bottom ball joints ok?
Fit Sachs HD shocks all round  unless you plan to go low.
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Ive been looking at new tyres and playing with increasing the sidewall and comfort!
OEM : 205/65 x 15 = 133mm sidewall, standard OEM tyre size. 2034mm circumference / 791 revs per mile.
A8 : 235/35 x 19 = 82mm sidewall, When speedometer reads 60 km/h actual speed will be 60 km/h / 2033mm / 792 revs per mile.
The below sizes stay within 5% of the original circumference. Its a ball ache working through the options so I posted what I'd done to date.
Check your rim width to make sure you're happy they fit and shaped to your liking!
205/45 x 18 = 92mm sidewall, When speedometer reads 60 km/h actual speed will be 59.5 km/h. 798 revs per mile.
205/50 x 18 = 103mm sidewall, When speedometer reads 60 km/h actual speed will be 61.4 km/h. 774 revs per mile.
215/45 x 18 = 97mm sidewall, When speedometer reads 60 km/h actual speed will be 60.3 km/h. 787 revs per mile.
215/50 x 18 = 108mm sidewall, When speedometer reads 60 km/h actual speed will be 62.3 km/h. 762 revs per mile.
225/45 x 18 = 101mm sidewall, When speedometer reads 60 km/h actual speed will be 61.1 km/h. 777 revs per mile.
225/50 x 18 = 113mm sidewall, When speedometer reads 60 km/h actual speed will be 63.2 km/h. 751 revs per mile +5%
235/35 x 18 = 82mm sidewall, When speedometer reads 60 km/h actual speed will be 57.6 km/h. 824 revs per mile.4%
235/40 x 18 = 94mm sidewall, When speedometer reads 60 km/h actual speed will be 59.8 km/h. 794 revs per mile.
235/45 x 18 = 106mm sidewall, When speedometer reads 60 km/h actual speed will be 62.0 km/h. 766 revs per mile.
235/45 x 18 = 106mm sidewall, When speedometer reads 60 km/h actual speed will be 62.0 km/h. 766 revs per mile.
245/35 x 18 = 86mm sidewall, When speedometer reads 60 km/h actual speed will be 58.3 km/h. 815 revs per mile.
245/40 x 18 = 98mm sidewall, When speedometer reads 60 km/h actual speed will be 60.5 km/h. 784 revs per mile.
245/45 x 18 = 110mm sidewall, When speedometer reads 60 km/h actual speed will be 62.8 km/h. 756 revs per mile.
255/40 x 18 = 102mm sidewall, When speedometer reads 60 km/h actual speed will be 61.3 km/h. 775 revs per mile.
Wheel & Tyre Size CalcLast edited by Activ8; 6th February 2019, 06:56 PM.
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