Bean Bandits Levin 'Globetrotter'

[Bean]

(12-25-2014 03:48 AM)jondee86 Wrote:  

(12-23-2014 02:26 PM)Bean Bandit Wrote:  Normally I have them on 2 or 3 and this soaks up a lot...

Driving in normal city traffic on these settings, how does the suspension
react to small (20-25mm high) square edged holes/bumps ? These are the
ones that send a short sharp shock into the car and make you wince when
you hit them. Like the manhole covers that you swerve to avoid if you see
them coming

Cheers... jondee86

No too bad, I'll make sure to hit a few when taking the footage.

(12-25-2014 12:18 PM)NoHachi Wrote:  

(12-25-2014 03:48 AM)jondee86 Wrote:  Driving in normal city traffic on these settings, how does the suspension
react to small (20-25mm high) square edged holes/bumps ? These are the
ones that send a short sharp shock into the car and make you wince when
you hit them. Like the manhole covers that you swerve to avoid if you see
them coming

Cheers... jondee86

Jondee, these very high velocity and very high frequency disturbances are not influenced much by dampers. Most of the shock is transmitted before they ever get into motion. This effect gets worse as you move the roll center towards the c.o.g.

If you want compliance over these kinds of disturbances, the places to look are tires with high and supple sidewalls, rubber control arm bushes and rubber top mounts.

Shitty shocks can make a difference here, but they have to be very bad indeed (lots of ae86 stuff is).

True I felt quite a difference when I switched from my highwalled 14s to 50R15s

(12-26-2014 02:30 AM)jondee86 Wrote:  

(12-25-2014 12:18 PM)NoHachi Wrote:  If you want compliance over these kinds of disturbances, the places to
look are tires with high and supple sidewalls, rubber control arm bushes
and rubber top mounts.

I usually have 60-Series, but have 55-Series at the moment, as decent
14" tyres are getting hard to find. Rubber bushings... yes. Rubber top
mounts... yes. And that is one of the questions on which there does not
seem to be a lot of information.

All coilovers replace the rubber top mount with a metal/metal camber
plate, and I have always wondered just how much difference this makes
to the noise/vibration transmitted to the chassis ? In industrial practice,
putting even a relatively thin layer of rubber in compression between
surfaces can make a decent reduction in transmission. So would putting
say 4mm of rubber between the camber plate and the tower be a good
move ? Has anyone tried this kind of isolation ?

Just curious really... as it seems to me that if you wanted to sell
coilovers for upmarket cars, keeping the noise/vibration increase down
would be a good selling feature.

Cheers... jondee86

Topmounts are solid on my end and I got polybushes all round still it's resonable comfy - for real comfort you need to get a Citroën DS
A thin rubber layer would certainly work on the noise/vibration matter but not make a difference in comfort.
Also don't forget on upmarket cars the entire noise isolation is much better and hence less of an issue compared to our old beaters.


Now to other GOOD news - after more than one year of search I finally found a place to work on my car. A nice workshop owner will provide me with a bit of space and access to all his tools (including paintbooth) after new years so progress updates should finally resume
I will start by stripping the whole car down and check everything over. I don't expect any big surprises but one never knows. Up 'till recently I wanted to stitch weld the whole thing but it's a lot of effort (cages are not allowed around here for street driven cars) and I'm not sure it's need to that extent - I'll do some analyzing once it's stripped and go from there. Also will review the Option Videos on that matter - strut towers will defo see some attention.
I'm open to suggestions/experience/opinions on that matter.