G
Guest
Guest
On my GTD I have had the standard original uprights plus more latterly the new race ones from Ray (on the front). I am now looking to change over to ali ones alround if I can find something suitable. Tomorrow I am going up to see Andy Burrows of Gardner Douglas to see what he has to offer.
I note on this forum that people are talking about a wide variety of readily available uprights.
As a word of caution I hope people are looking at the effects on geometry that having say a corvette upright will have in comparison to the factory supplied item (not just GTD makes here but all makes). The fixed points in this discussion are the chassis pick up points. It is unliklely that these will be changed in fitting your uprights. The relationship to the upright pick up points will have some effect on geometry and it may be dramatic. Roll centres move about enough as it is! In addition any alterations to the trailing links could encourage rear wheel steering on bump and droop by changing rear wheel toe in.
On the front the issues could be changing the king pin inclination and effects on Ackerman and turn in.
And lets not forget the easy one to check, camber changes. If they get large then you could lose a large chunk of footprint and grip.
I have a DOS based program that allows me to experiment on a very basic level with graphical visualisation of the set up. Anyone looking down at changing their uprights or doing their own thing would be well advised to try and find a suspension software package to help predict the effects of what they are doing.
So the question is....
Does anyone recommend a software package they have?
and
Has anyone got any thoughts about their own experiences on the above?
Malcolm
I note on this forum that people are talking about a wide variety of readily available uprights.
As a word of caution I hope people are looking at the effects on geometry that having say a corvette upright will have in comparison to the factory supplied item (not just GTD makes here but all makes). The fixed points in this discussion are the chassis pick up points. It is unliklely that these will be changed in fitting your uprights. The relationship to the upright pick up points will have some effect on geometry and it may be dramatic. Roll centres move about enough as it is! In addition any alterations to the trailing links could encourage rear wheel steering on bump and droop by changing rear wheel toe in.
On the front the issues could be changing the king pin inclination and effects on Ackerman and turn in.
And lets not forget the easy one to check, camber changes. If they get large then you could lose a large chunk of footprint and grip.
I have a DOS based program that allows me to experiment on a very basic level with graphical visualisation of the set up. Anyone looking down at changing their uprights or doing their own thing would be well advised to try and find a suspension software package to help predict the effects of what they are doing.
So the question is....
Does anyone recommend a software package they have?
and
Has anyone got any thoughts about their own experiences on the above?
Malcolm