rear bump stops

Rohan,

Re: my road car.

I read your recent advice to Mark and also been looking in some of the old threads were you give advice on setting up ride height. I have just followed it with my new camber gauge etc.

When I fitted the rear coil overs I fitted some poly foam type rear bump stops. They are those ice cream cone shape ones with the wasted sections so they will convalute (if that is the right word).
I got them from Paul Matty. Supposed to be performace ones. They were 135mm long with 5 segments. I cut the small segment off and have had them fitted for about 6 months. Saying that, the car height is set quite high! With a piece missing they were 100mm. I just measured a standard one at 80mm. i noticed you said extend a standard bush by 20 mm.

I am on with setting up up again and lowered to book horizontal ride height of the bones. I have spent quite a bit of time synchronising the front camber. It was different. I managed to file the top left to equalise. I now have 3/8 of a degree positive at book height. By lowering about 13mm I got 1/2 of a degree negative. I am going to set up at this.
So do you think this is ok with the bump stops. I still have the bits I cut off.

Another question.

I was going to set the car level but soemone said it would be better with the rear sligtly higher. I just want a fast road spec’ and very odd track day use. I realise it is all a compromise. What do you think?

Thanks Mike

What you are doing sounds about right IMHO provided you end up with an acceptable ground clearance at the lower suspension height with the tyres your running and the roads you run on and the exhaust you have.

The longer bump stops sound good provided they have a similar progressive spring rate to the orginal Aeon rubber springs. Many of these replacement ones I see are too soft and not doing anything until really compressed solid. The standard Aeon rubber springs work in an approx 50 to 100 lbs per inch range over the working range when spaced down. I tried a stiffer Aeon spring that was about 3 times harder but found it too stiff and an abrupt transition that destabilished the car when it came into play.

Ride height without driver in car I set to around 10mm higher at rear to get the car level with driver weight.

regards
Rohan

Rohan,

thanks for the info’, Sounds good.

Regarding bumps stops, I will probably put the originals back with a 20mm spacer next time I go in there, if I am not happy with these. In fact I split some old spare uprights and they had some alloy spacers.

thanks

Mike