V8 Vantage tuning (SLINC) - Chassis/Geometry
Discussion
mikey k said:
Very interesting 
Geometry can make a massive difference to the handling and feel of a car.
Did they do it with your weight added to the drivers seat?
Where can I find the details of the standard geometry setup?
Oi, I am not that much of a fat bGeometry can make a massive difference to the handling and feel of a car.
Did they do it with your weight added to the drivers seat?
Where can I find the details of the standard geometry setup?
d!! 
No they didn't do the geo with me sat in it.Standard settings? TDI reckon every Aston they have done have come in with completely different base settings.
Neil1300R - LOL no insult intended. Many sports cars come out their factories with varying geo setups. Which is surprising considering how much it effects the handling of a car. 
As 355f says things like contents of fuel tank and drivers weight can have an effect.
I tend to get my cars done with half a tank of fuel and the drivers weight in the seat.
So can anyone post up their settings?
As 355f says things like contents of fuel tank and drivers weight can have an effect.
I tend to get my cars done with half a tank of fuel and the drivers weight in the seat.
So can anyone post up their settings?
I think my point is that I can fully understand how accurate Geo is required for the best handling and how, in bringing it to spec,the results are impressive.
What Im cant understand is how, in comparison to Aston factory, a small little outfit can 're engineer' the settings to improve upon factory spec.
The one explanation given is that the factory use conservative settings togive safe- but not the best handling.
Having played with chassis tuning a bit in the past, one can improve things by giving a little more toe out on the rear for example; which does result in better handling. The price for this however is reduced tyre life and somewhat snappy rather than progressive handling near the limit.
I am happy to be proven wrong of course!
What Im cant understand is how, in comparison to Aston factory, a small little outfit can 're engineer' the settings to improve upon factory spec.
The one explanation given is that the factory use conservative settings togive safe- but not the best handling.
Having played with chassis tuning a bit in the past, one can improve things by giving a little more toe out on the rear for example; which does result in better handling. The price for this however is reduced tyre life and somewhat snappy rather than progressive handling near the limit.
I am happy to be proven wrong of course!
Exactly - the factory have to compromise on a set up that is safe and gives acceptable tyre wear for all.
For example on my current car I have reduced the caster to make the steering feel lighter and quicker, the down side is it is more "nervous" on the motorway.
I also upped the rear camber by -1 degree to give better grip and traction in the corners, downside is inside shoulders wear quicker.
Not messed with the toe on the current car as it has passive rear wheel steering and I dont want any more oversteer
For example on my current car I have reduced the caster to make the steering feel lighter and quicker, the down side is it is more "nervous" on the motorway.
I also upped the rear camber by -1 degree to give better grip and traction in the corners, downside is inside shoulders wear quicker.
Not messed with the toe on the current car as it has passive rear wheel steering and I dont want any more oversteer
Neil1300R, it's great news to hear that you're happy with our changes.
In a nutshell she's a little bit fussy.
On the second point whilst I appreciate that we're a mere minnow compared to a corporate giant like Aston Martin, but we do have a technical director who is very geeky indeed, I've found chassis dynamics a subject of great interest for a very long time.
On the last point as I mentioned earlier in the thread I have no doubt that there is/was some pressure on the development team on this car to ensure that the users of "below average ability" are still able to remain in control of the car during a limit grip manoeuvre such as collision avoidance even in poor road conditions. It's because of these market pressures that the car has stability control as opposed to simple traction control, it logically follows that it is easier for the stability program to help the driver when the road speed is lower than when it's higher. It's for this reason I suspect that the development team aren't shooting for 100% ultimate single lap performance with their factory set static geometry.
In a nutshell get it into the computers sooner rather than later.
355f said:
I think my point is that I can fully understand how accurate Geo is required for the best handling and how, in bringing it to spec,the results are impressive.
What Im cant understand is how, in comparison to Aston factory, a small little outfit can 're engineer' the settings to improve upon factory spec.
The one explanation given is that the factory use conservative settings to give safe- but not the best handling.
I'll try to explain, firstly to address your first point not all cars are equal in this regard as some suspension system designs are far more susceptible/reliant static geometry than others. In the case of the V8V we've found that the suspension system needs highly accurate starting positions in order for the many pre-loaded bushes to react in the intended pattern. The up shot is that a small imbalance in starting position across an axle can cause a relatively large imbalance in the way the car drives, especially around the zero yaw zero lat/acc position when the bushes are mostly unloaded and are potentially seeing frequent load reversals. What Im cant understand is how, in comparison to Aston factory, a small little outfit can 're engineer' the settings to improve upon factory spec.
The one explanation given is that the factory use conservative settings to give safe- but not the best handling.
In a nutshell she's a little bit fussy.
On the second point whilst I appreciate that we're a mere minnow compared to a corporate giant like Aston Martin, but we do have a technical director who is very geeky indeed, I've found chassis dynamics a subject of great interest for a very long time.
On the last point as I mentioned earlier in the thread I have no doubt that there is/was some pressure on the development team on this car to ensure that the users of "below average ability" are still able to remain in control of the car during a limit grip manoeuvre such as collision avoidance even in poor road conditions. It's because of these market pressures that the car has stability control as opposed to simple traction control, it logically follows that it is easier for the stability program to help the driver when the road speed is lower than when it's higher. It's for this reason I suspect that the development team aren't shooting for 100% ultimate single lap performance with their factory set static geometry.
In a nutshell get it into the computers sooner rather than later.
Edited by SamBorgman on Tuesday 25th May 10:57
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