I don't quite understand it...
The amount of roll the rear of the Mini has would mean the suspension arm is on the bump stop a fair bit of time through cornering.
Is this good? Does the rear become instantly VERY hard (stiff) when on the bump stop?
Wouldn't sorting out a proper rear setting work better than relying on a bump stop for the suspension to ride on?

I am just wanting to get some advice, as I am at the stage of thinking about what goes into my rear subframe.

Similar effect on a dry car to using a rear antiroll bar. Increases the spring rate on the outside wheel during cornering.
Also reduces squat rearwards on acceleration. That's why I put them on Josh's Starlet Clubby.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Just built the suspension set-up so that it works properly during cornering instead of bouncing of the stops. A good set of coil overs are the only way to go.
If you want to get really fussy then ajdustable 4 link rear with coils. no more heavy arms

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

surely a rear anti roll bar would make the thing way to stiff..?

_________________
Potato

Some of the fastest Nb Minis race without a rear anti-roll bar, or comp bumpstops...

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

also as a temporary quick fix as a uni student the price and time to install rear comp bumpers is very handy

_________________
Enjoy Chris

That's why we put them on, helps greatly with the pitch of the car when i get on the power.

Makes the car feel nicer and firmer to throw around but technically isn't the best if the car is sitting on the bump stop fully compressed around a corner as you have no suspension then.

Cheap too.

Only other option for me was to get custom lockup shocks at the rear.

I don't believe in coil-overs in a mini.

_________________

Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

That's why we put them on, helps greatly with the pitch of the car when i get on the power.



Makes the car feel nicer and firmer to throw around but technically isn't the best if the car is sitting on the bump stop fully compressed around a corner as you have no suspension then.

That's why you have suspension on a car. You might as well just weld the hubs in position and use the tyres for ride.

Cheap too.

Only other option for me was to get custom lockup shocks at the rear.

I don't believe in coil-overs in a mini.[/quote]

Interesting comment WHY ?

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

The bump stops aren't just a hard big lump of rubber that the car sits on, but a progressive aeon spring which gives the car better turn in.

Coil-Springs are a personal thing, for me it's a unique feature to the mini that makes it a mini. They won Monte-Carlo/Bathurst with the Hydro setup and certainly handling isn't one of the things someone comments on negatively about a mini in the first place so why change a good thing?

_________________

Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

they won Monte-Carlo/Bathurst with a 1275 eng. Well why are you putting another engine into a mini.
The suspension has absolutely zip to do with a car's ability to" turn into a corner" This is controlled by the akerman turn of the front wheels. a increase in toe-out does this,but you have to make sure it's the correct wheel that is getting toe-out. IE if you are going around a RH corner ,then the inside wheel[RH] has to turn more than the out-side wheel [two different radius of a circle] This is controlled by the arc that the steering arm is travelling thru during suspension movement.
It's the same with hard braking, toe-in gives stability and toe-out helps to iniate the turn.
Put a set of suspension trammels onto a mini suspension and do all the measurements on the wheels ie camber,toe settings, when the car is going thru the body roll, suspension travel ,turning etc etc and look at what the wheels are doing.
When you have done that with your mini and understand the principles of suspension design you might get a shock.
Rembember minis were built on a retail price budget and were designed for a cheap car for mum and dad to use.
I agree that minis do go around corners better than some other cars,but they are far from perfect. If they were perfect then you would see rubber cone or hydrolastic mini suspension on formula 1 cars

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

Hey i never said that it was the best option, and i also said it was a personal thing.

I do still have a-series powered minis, and the conversion has kept everything else that is mini still intact from the steering rack/column to the suspension is still pure mini. The method of propulsion has not changed how the car feels and if you didn't look you wouldn't know unless you floored it.

When you start modifying with new engines, steering racks columns etc you start to lose part of the original essence of the mini. Sure it may be faster/better but on the same token where do you stop? why not just go the whole hog and spaceframe the damn thing?

_________________

Starlet Conversion:
http://www.ausmini.com/forums/viewtopic.php?t=15484

This is exactly what I am getting at . Once you start to change the original set-up of a car ,then it influences many other componets.
What you then have to look at is these changes to ensure the car is still going to perform in a safe manner. IE changes in center of gravity , roll center and polar mass of inerta change[engine weight]
Even lowering a car by 1/2" changes the original suspension design calculations and the overall performance of the handling.
Yes it is a "personal" thing ,but sometimes that clouds the down side to what you are trying to acheive and the best set-up.
I have both bog standard minis and spaceframe ones. Suspension design is a complex thing that most people have their own ideas, but it comes back to what works and what does not.



I am quite sure that a lot of people would disagree with my set-up

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

You seem to be carrying around a lot of bits of steel.

What class it it being built for?

it's having a super-charged 2.2 lt twin cam toyota mid engine with 5 speed hewland [VW] box and running in sports sedans. And before you quote the rule book about body mods etc,for sports sedans, stewart and ardern sprints are the only modified body that is allowed. Stewart and ardern were the BMC apointed world wide agent and their car/ mods were covered by BMC factory warranty and sold world wide thru BMC dealers.
The rule book does not specify what modifications were done by a dealer.
It is no different than a commodore that was modified under HDT, and they are legal.
Don't worry plenty of others have tried to stop me but have not succeeded on this issue.
It might look heavy but the complete car weighs a little more than a std mini,but with a little more HP and a lot stiffer.

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

Ah, ever the master of understatement

_________________
Simon

The adventures of an owner builder in the Tallarook Ranges