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Mats · Post by **Mats** » Thu May 31, 2007 12:08 pm

sry, missed that. Never hurts to clarify though.

grant · Post by **grant** » Thu May 31, 2007 2:38 pm

I want to use 2.25" springs, but what did you have to do to locate the top of the spring on the chassis? I'm assuming you removed the stop spring rubber locator? There's no way to use 2.25" springs and still allow use of the stock springs if I need to go back right

Ron's springs go from 2.25" to stock ID of course.

Micke · Post by **Micke** » Thu May 31, 2007 10:10 pm

I guess you could place the 2.25" spring inside the original one. I don't know why anyone would want to go back tho.

I moved my springs as much out as possible. Welded a plate to make it flat there first and then a piece of exhaust tubing to locate the spring.

Maurizio · Post by **Maurizio** » Thu May 31, 2007 10:26 pm

@Grant

I did the same in the back. Welded a tube and contact patch in/onto the original spring locater. And 2.25"springs with adjustable spring perches can be used in the back.

grant · Post by **grant** » Thu May 31, 2007 11:11 pm

Hey,

I'm not following what you mean by having the 2.25 inch spring inside the stock one? I can see why you would want to have the spring as far out as possible (shoulda been done from the factory?) but for a stock location, what can I do about where the spring meets the chassis?

Would I remove the stock rubber locator there and weld on a flat piece and piping down to the ground to keep the top of the spring from moving?

@Marz,

We're only talking about using 2.25" springs on the rear end right? What do u mean you used a threaded adjuster on the rear?

I was hoping to do something on the dedion a la RSR, but I want to use the 2.25" ID entirely.

Anyone have a pic? I think this is my next step.

Maurizio · Post by **Maurizio** » Thu May 31, 2007 11:39 pm

Yep,
Just like RSR used a threated adjuster and full 2.25" in the original position at the back.

Micke · Post by **Micke** » Fri Jun 01, 2007 1:01 am

Hope this helps.

TS_turbo · Post by **TS_turbo** » Fri Jun 01, 2007 8:50 am

Micke wrote:TS:
I'm not 100% sure what you mean but "different vertical load values on outside tires" is weight transfer or what do you mean?
.

Micke sorry for my rough english

what i try to say is high roll center will cause reduced overal vertical load ...
if vertical load of inner and outer tire in rest is 400kg in cornering overal load will be 400- value of lift force caused by high roll center ... of course from your point of view you are also right that high RC will reduce lateral load transfer ... but from my point this reduce is not from load transfer but from lift (jacking force)

Micke · Post by **Micke** » Fri Jun 01, 2007 12:32 pm

Your english is totally OK.

So you found out how planes are flying. They just have hight roll centers to reduce their weight

If the car weighs 1000 kg there's no way a RC high or low can change that.

TS_turbo · Post by **TS_turbo** » Fri Jun 01, 2007 1:16 pm

Micke wrote:Your english is totally OK.

So you found out how planes are flying. They just have hight roll centers to reduce their weight

If the car weighs 1000 kg there's no way a RC high or low can change that.

i am talking G(ay) force and cornering of course

Barry · Post by **Barry** » Fri Jun 01, 2007 10:32 pm

Micke,Tell me how the droop straps or cables influence the front of your car..

Not under braking but purely cornering..

When we built the GTA race cars the droop cables and later the droop built into the shocks was done because of the front wheel drive configuration..

Ive not looked at droop on a gtv yet..interesting..
I cannot see the De Dion setup acting on the front suspension inany way similar to the 147 GTA race cars..Totally different suspension and configurations..

Micke · Post by **Micke** » Fri Jun 01, 2007 10:42 pm

Barry. The staps are only there to prevent the springs from falling out. They are not active while driving. I cannot imagine any advantage of droop stops in the rear of a RWD car unless running a spool.

I will try adjustable droop stops in the front. I've been warned it might not be a good idea but there are some reasons for trying it.

Maurizio · Post by **Maurizio** » Fri Jun 01, 2007 11:50 pm

Micke wrote:I will try adjustable droop stops in the front. I've been warned it might not be a good idea but there are some reasons for trying it.

When people get bored they try strange things to get some colour in their lives

Without joking: can't think of a reason. You always take away grip what is the good in that?

Micke · Post by **Micke** » Sat Jun 02, 2007 12:25 am

Then I'll let you think about it.

Anyway, it is for racing only.

Mats · Post by **Mats** » Sat Jun 02, 2007 3:00 am

HAHA! Good one Maurizio!

Since I drove an alfetta with droop-stops tuned suspension my first year in racing I have always hated it. The total step-function in the springrate is absolutely crap for tire grip and it is very upsetting for the car.
Jerkiness is always bad.

I read in the last RaceCar Engineering that it was never desirable to have a step in the spring rate as with droop-stops, great to get confirmation from "the pros".