Rebound and bump for idiots

[shimmy]

Hi Glendog74 I would be really interested to know what castor and toe settings are linked to the -2.5 & -3.5 negative camber and how it changes if at all when moved to -3.5. Also do you know how they set the back up?? Camber & toe?? I'm quite shocked other people are running as much as -2.5 negative with no premature tyre wear inside on the road. Sorry for all the questions but I'm fairly new to CSL ownership and have adjustable topmounts now so would like the best of both worlds on road and track......:thumbs:

ive seen cars running -2 on road with premature front inner wear let alone -2.5 so i am shocked as well, so maybe depends on mileage and maybe other settings such as toe and castor as well more than i thought?

my toe used to move from 1mm in to 0.5mm out when i changed camber form -1.5 to -2.5. Simpsons recently said that the movement in toe is more now i have -2 to -3 (no figures though) and i guess even more with -2.5 to -3.5 making it difficult to have the toe acceptable on road and track

[Lee13]

Thanks Shimmy, everyone seems to run different and has different tyre wear. I have set mine at -2.0 for the road with standard castor and toe. I guess I should just see how I get on and maybe run -3.0 on track. Do you find that's ok then?? Do you find a little toe out on track is better than the standard 0 degrees?? Also what do you run on the rear? I cant find anything really on set up only -0.5 camber to help oversteer but no mention of toe settings.... Thanks in advance for the help Lee

[s.mac]

I have standard suspension running at -1.5 camber with 10mm spacers and I have premature inner front tyre wear. Don't ask me about toe and castor though :whistle:

tyre wear is quite severe :banghead:

[shimmy]

ok, my car is set up by Simpsons. I used to have it set up for heavy road use (lots of miles) so went with front -1.5 camber, 1mm in toe. My PS2 tyres have lasted about 20k miles so far and on front still have 2mm and a little inner premature wear (but i suspect this was from -2 camber days a few years ago)

I think that Simpsons prefer to run toe out a little on track rather than have too much toe in on road. I think the balance is quite tricky but for the -1.5/-2.5 set up 1mm in and 0.5mm out was ok.

I am not sure what the toe settings are for my new set up (i will ask) but i suspect it is probably around 1.25mm in and 0.5mm out - dont quote this

on the rear i have always run -1.25mm camber and 1mm toe in for road and track. Tyre wear is perfect and curent Cups have now done 7 track days/1200 track miles. There might be better grip set ups at the rear but i am apy with good wear tbh.

NOW i have to add that this year i fitted the Intrax and it makes a massive difference to tyre wear imho on track as it stops the roll quite a bit and saves the edges. Not sure it makes much difference on the road (

[Lee13]

Thanks for all the info Shimmy:clown:

[glendog74]

Hi Glendog74 I would be really interested to know what castor and toe settings are linked to the -2.5 & -3.5 negative camber

Can't help i'm afraid - i don't know!

[daniel_csl]

It sounds like everybody is using simpsons on here! What does a full alignment and proper setup run you?

[shimmy]

tbh sb, Simpsons, Thorney, Bexley Motorworks (BMS) and a few others all can do a good geo, as they all race and do road cars.

Pick your closest if it is just geo you want but just make sure you tell them what you want to achieve

[NZ_M3]

Static toe out on the track is fine - gives better turn in - but on the road it'll tram line quite a bit (that's what happened with mine anyway, so I've gone back to very very slight toe in for better stability) I ran quite a bit of toe out to help with the low speed understeer, but it just made the car way too nervous to drive for me at the limit.

[shimmy]

Static toe out on the track is fine - gives better turn in - but on the road it'll tram line quite a bit (that's what happened with mine anyway, .

thats what i was told at the time :thumbs:

[_Nathan_]

Toe out kills the inside edges but is great on track, everything in suspension seems to be a compromise if you use the car on road and track...

[NZ_M3]

Toe out kills the inside edges but is great on track

According to my experience and the Simpson's article posted by Shimmy it's the other way around actually:

Too much toe-in and the tyres will tend to wear prematurely on the inner edges
through scrubbing. Conversely, too much toe-out will see the outer edges wear in
the same way.

[_Nathan_]

Sorry.

[shimmy]

Sorry.

thicko:hahaha:



:beer: i had to look up what castor was yesterday :thumbs:

[_Nathan_]

I'm wearing my dunce's cap now