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Front to Rear Wedge
Posted: Thu Aug 13, 2009 6:12 pm
by Cerberus
How sensitive is the chassis to adjustment, will 1mm make any difference or is there a minimum of say 5mm before you notice anything? the reason i ask is the nearside rear is a pain in the arse to adjust with a C spanner
i'm currently running 18mm and it oversteers when having fun.
Re: Front to Rear Wedge
Posted: Thu Aug 13, 2009 6:23 pm
by stylussprinter
It very much depends on how fast and or agressive you're going for oversteer to occur --- ie. are you meaning to hang the tail out or is it catching you out
Regarding noticing 1mm wedge adjustment , I would say that you would only notice by monitoring lap times . 5mm yes , you'll notice. Higher = more oversteer . Lower more rear grip but more understeer --- pays you money and takes your choice
This assumes that all other parameters of adjustment are ok / tyre pressures , shock settings etc etc.
Re: Front to Rear Wedge
Posted: Thu Aug 13, 2009 6:40 pm
by Cerberus
stylussprinter wrote:It very much depends on how fast and or agressive you're going for oversteer to occur --- ie. are you meaning to hang the tail out or is it catching you out
Regarding noticing 1mm wedge adjustment , I would say that you would only notice by monitoring lap times . 5mm yes , you'll notice. Higher = more oversteer . Lower more rear grip but more understeer --- pays you money and takes your choice
This assumes that all other parameters of adjustment are ok / tyre pressures , shock settings etc etc.
It's catching me out, its not bad just seems to slip slightly then grip again which is unerving (hard to explain more like a little protest from the tyres) as for springs/shocks =250lbs F 200lbs R played with settings and i am happy with them, tyre pressures are 16lbs on Toyo T1S, i think i will drop the rear slightly and see what happens, i did have 300lbs F 250lbs R but it was to hard and understeered badly, whereas now the front turns in and grips beautifly having said that i do nee to make some new lower wishbones to give a bit more caster as i have only got +3* which makes it a bit unstable at speed.
Re: Front to Rear Wedge
Posted: Thu Aug 13, 2009 8:19 pm
by stylussprinter
Cerberus wrote:stylussprinter wrote:It very much depends on how fast and or agressive you're going for oversteer to occur --- ie. are you meaning to hang the tail out or is it catching you out
Regarding noticing 1mm wedge adjustment , I would say that you would only notice by monitoring lap times . 5mm yes , you'll notice. Higher = more oversteer . Lower more rear grip but more understeer --- pays you money and takes your choice
This assumes that all other parameters of adjustment are ok / tyre pressures , shock settings etc etc.
It's catching me out, its not bad just seems to slip slightly then grip again which is unerving (hard to explain more like a little protest from the tyres) as for springs/shocks =250lbs F 200lbs R played with settings and i am happy with them, tyre pressures are 16lbs on Toyo T1S, i think i will drop the rear slightly and see what happens, i did have 300lbs F 250lbs R but it was to hard and understeered badly, whereas now the front turns in and grips beautifly having said that i do nee to make some new lower wishbones to give a bit more caster as i have only got +3* which makes it a bit unstable at speed.
How old are the tyres -- are they getting hard after 2 to 3 years
16 psi for Toyos is low for best performance , Yokos are ok at 16 but 17 at lowest for toyos .
Re: Front to Rear Wedge
Posted: Thu Aug 13, 2009 8:28 pm
by Cerberus
i've worked the pressures down from 20lbs in 2lb increments 16lb feels better especially on the fronts, so i will take the rears back up and see, i really need to get it on a track two days would be nice, on the plus side my latest engine seems strong