mx5cartalk.com

after fitting my LSD i have found the rear end a lot more twitchy and i'm interested in reducing this. (but don't want an understeering pig)

current setup:

teins: front 12 rear 10
white line adj sways: both middle setting
allignment:
- front castor 5
- front camber -1.2
- rear camber -1.2
- rear toe in 0.5mm


just after some opinion for my next wheel alignment (fiddled with steering rack)

should i increase rear camber to -1.5
or increase rear toe?

i had both sways on hard for a while but found it too stiff and think it was limiting the suspensions effectiveness over bumps. i doubt i can go soft on the front (looks like it will hit shock) maybe the rear. they seem very difficult to adjust without adjustable links.

should i leave the alignment as is and just try setting the rear bar to soft?

Try playing with tyre pressures!! Trust me when i say this, if i had known this on sat arvo i prolly wouldnt of put my car into a wall on sat nite. Took me half the (drift) comp to get the car acting the way i wanted it too. I played with shock settings for a while but found that tyre pressure had the greatest effect on rear grip. I went from a wall hitting 32psi to a happily sliding but still grippy 38psi in the rear tyres.

Dave

NAs toe out under power, so the static toe in is to compensate for that. I'm not sure if 0.5 is enough toe in, I run 2mm. Also I run more neg camber at the back than at the front, 1.5 vs 1.2deg.

Also....for track, I run my Teins with a differential of 4 clicks, 2 was too taily....and, when I swapped over to Teins, I found that the whiteline rear swaybar was overkill....swapping the stock rear bar back made it much more neutral.

So....it looks like you have a real dorifto setup there

Tyres would be my first choice too. You can also play around with the shock stiffness a little. Increase stiffness in the front a little.

A lot of the allignment experts here on this forum say the front needs to have more camber than the rear in the MX5. Depending on your driving try -1.5 front & back.

You LSD making your rear end a little twitchy. What type of tyres are you running.// Are they old? Good chance ther are crappy. I found my LSD made me understeer through corners except in the wet. But i run RT 615's & they stick like .....
I also run -2.25 camber front -2.1 at the rear & still manage to wear the outside quicker. But it all depends on your driving style

You will be amazed at how much the tyre pressures will affect turn in and oversteer, if you are oversteering I would suggest less in the rear. I run 205/50R15 and run at about F-32psi R 30psi for track to prevent rollover and less for road, and then less again if I am doing very low speed motorkhana type events. I usually have about 2psi more in the front and that is all cold pressures. It will be different for different tyres and sizes so have a play.

Also, try not to bury the right foot too much

Tim

check all the things that every one has mentioned, but also, try to work on your throttle control. having gone from an open centre, to a clutch pack lsd, i can understand what your saying. maybe have a look at your driving style to see how you are accelerating in and out of corners. you may need to just ease off a little and then smooth it on. i found this sort of helped a little in keeping the rear on mine straight. thats my experiences anyway

Generally speaking, stiffening up the front end will decrease oversteer - or put another way, increase understeer.
Stiffening the back makes it more taily.

This applies to whether you stiffen up by adjusting the shocks/springs/swaybar or just the air pressure in the tyres.

As someone else said, larger rear bars may feel good on the street at 7/10's, but will make the car oversteer a lot at track type speeds.
Try disconnecting the rear bar, or at least softening it, then try and see how the car handles.

Front bar full hard and either a) rear bar full soft or b)stick a standard rear sway on it. The wheel alignment will make dick all difference if your bar balance is wrong. Fix the bar balance first.

Tein Flex on mine, with hard springs. I have an adjustable whiteline front bar set to soft (Until I get adjustable end links) I ended up removing the rear sway bar to settle the back end.

J

More Rear toe in will definitely reduce oversteer but only as a last resort.