38 replies to this topic

[Tony H]

2-2 is not necessarily standard there can be variance in the chassis and suspension that needs different arrangement to get the setting. Standard castor is 3.8degrees, iirc snubber only in front will usually give about 4.0 http://wiki.seloc.org/a/Geo_Setups

[harboged]

According to the TIS, the NA had 3.8 deg castor as standard but the Turbo had only 2.5 deg. Maybe because the Turbo was more comfort oriented?



 

Edited by harboged, 31 August 2016 - 04:04 PM.

[smiley]

Some more comparison options.

[Tony H]

Let's settle the most important issue here, is it caster or castor?

[Zoobeef]

 

 

 

I assume you went from 2-2 to a 3-1 shim distribution? (as you normally need minimal 1 rubberised shim at the uper "front-rear" position...)

 

 

Is 2-2 (presume 2 in front / 2 in rear) the standard setting?

 

Alternatively, I presume increasing the castor mean = 1 (in front) 3 (in rear)?

 

 

3 in front and 1 rear will increase the caster. You need to move the upper wishbone rearwards.

[D-DAWG83]

It appears that i only have 3 fwd, and none rear. I guess that maybe the source of my knock/rattle

[Doctor Ed]

Let's settle the most important issue here, is it caster or castor?

Same same, english american etc

[Zoobeef]

One of the washers should be a "snubber" washer which has a rubber coating on one side. The rear one on the front part of the arm with the rubber side facing the wishbone.

Edited by Zoobeef, 31 August 2016 - 08:53 PM.

[Tony H]

It appears that i only have 3 fwd, and none rear. I guess that maybe the source of my knock/rattle

If you have no snubber, it will knock when you accelerate or brake hard as the wishbone is torsioned. If you only have 3 check your box section hasn't been bent in slightly.

[Chris P Duck]

Blink Motorsport who did my geo said in the VX more was better as the range the shims gave was very small and the "maximum" was still very tame. They said they wouldn't usually advise to change it as the reward is not worth the effort, however as I had mine apart for powder coating anyway they advised 3 and 1 as you need to keep the snubber where it is. If you're really anal about getting the same left and right there is a kit (seriously lotus I think) that do 0.5mm shims rather than the usual 1mm so you can make smaller adjustments. I believe with non standard bushes you don't use the snubber washer so I assume could run all 4 on one side? (Worth checking this though as it's just from memory)

Edited by Chris P Duck, 31 August 2016 - 09:03 PM.

[Zoobeef]

Correct.

[Zoobeef]

Ideally you want to see what your caster is before, and see how the shims are set either side. And from that you can see if there's any strange tolerances in your chassis. I.e each side needs a different setup to get the same caster on each side.

There has been some found with different each side before.

[Chris P Duck]

Ideally you want to see what your caster is before, and see how the shims are set either side. And from that you can see if there's any strange tolerances in your chassis. I.e each side needs a different setup to get the same caster on each side. There has been some found with different each side before.

Or in my case it was different side to side but after I'd put it all back together with 3 and 1 both sides that was equal side to side.

[Andrew aka Stuwy]

 

 

If I were you I'd stick with OEM settings Matt, lots of experience and talent went into setting the base car. As you drive it on the road, set it up for the road IMO (as per OEM settings).

 

Castor is the least influential day to day geo setting IMO. I didn't notice any change in my handling when I increased mine.

 

 

don't you only drive on the road as well?

 

telling him to stick to OEM settings and then saying you did something different is a bit contradictory  

 

 

I run slightly different geometry to OEM as I have lots of non standard parts on my car, like different hub carriers, different wheels, substantially more tyre to take advantage of, more overall weight, different shocks, abnormal front/rear spring delta, different steering arms, more front axle loading, higher front ARB stiffness, much higher floating mass at the front etc etc.

 

His car is pretty standard I think, hence my advice is not contradictory, but different due to our vastly different parts & weights.

 

Anyway, my settings are pretty close to OEM, the only main difference is that I have 0.5 degrees of neg camber on my fronts with a bit more toe out  and a bit more toe in on the rears.

 

 

considering you don't know the exact spec of his car, I think it is contradictory.

 

all vx's are different so all settings will be different.

 

your also assuming that he knows the spec of your car!

Edited by Andrew aka Stuwy, 01 September 2016 - 11:59 AM.

[D-DAWG83]

It appears that i only have 3 fwd, and none rear. I guess that maybe the source of my knock/rattle

If you have no snubber, it will knock when you accelerate or brake hard as the wishbone is torsioned. If you only have 3 check your box section hasn't been bent in slightly.

Iv got Superpro bushes on mine, so dont need the snubber. However, i cant see any washer behind the bush on the upper wishbone. That maybe the annoying rattle/knock iv got. MBR set the car up at the start of the year,Going to investigate asap.

[piwo]

Has anyone made a castor higher than 7 degrees?
New porsche gt3 rs 922 with double whisbone has 8°30min castor.
Alpine a110 with double whisbone has 7° castor.
I understand that lotus/ vx220 has only 4° castor because there in no power steering because big castor it is harder to turn the steering wheel ?

Edited by piwo, 28 December 2024 - 01:55 PM.

[KurtVerbose]

You'd think Porsche owners wouldn't need power steering with all the arm excercises they do.

[oblomov]

You'd think Porsche owners wouldn't need power steering with all the arm excercises they do.

To be fair, they tend to be either the right or left arm, limited to a four inch articulation withiin a single plane, further limited by a ten second maximum time span.

[KurtVerbose]

 

You'd think Porsche owners wouldn't need power steering with all the arm excercises they do.

To be fair, they tend to be either the right or left arm, limited to a four inch articulation withiin a single plane, further limited by a ten second maximum time span.

 

 

I think that's a gross over estimation. My guess - 2cm.