understeering need help race on high grip asphalt,

[gtimax]

I need to race with buggy tire on high grip asphalt, I felt understeering a lot specially accelerate exit corner. from my touring experience reduce rear toll in may solve it but DB01 rear toll in is fixed, what can I do?
thanks a lot!:thumbsup:

[woOdy]

I need to race with buggy tire on high grip asphalt, I felt understeering a lot specially accelerate exit corner. from my touring experience reduce rear toll in may solve it but DB01 rear toll in is fixed, what can I do?
thanks a lot!:thumbsup:

shorten rear camber link or lengthen front camber link. This might help but I have never raced buggies on that surface sorry. You could if possible increase the front caster also but not too sure on DB01?

[bodgit]

You could try fittting these on your wheels, made for asphalt
http://i988.photobucket.com/albums/af10/bodgit_2009/th_BWzqb8gCGkKGrHgoH-CoEjlLluzlBKZKv-i.jpg

[Big G]

generally I find my buggy oversteering a lot when racing on carpet due to the insane grip. When I run on low grip tracks I use a rear stiff ARB and swap it to the front on highgrip.

if you want the car to push on less exiting corners on the power try the rear ARB, raise the back up, less rear toe in, stiffer rear springs, move rear shocks out on the tower 1st. then try the opposite on the front, ie, lower front, softer front springs, move shocks in on tower.

[gtimax]

thanks a lot Guys! I will try some below next week.
--according to the race rules I have to use original tires.
--I will try to made front soft and rear harder but afraid when jump up the front will point low rear high makes landing difficult......
--I try front oneway and rear roll bar also, hope it is not to hard to handle!

looking forward to your comments!

[Big G]

front 1 way will just make it more loose off power entering a corner and shouldn't effect the on power handling.

I'd start with a rear ARB since this won't effect your jumping. There are a few other changes that you can make like less rear camber 1st and more front camber 2nd you can try

[steelie600]

The advice above is very good and sound advice, but have you thought about driving the car slightly differently??? Ie squaring the corner off. In this youd go slightly wider and slower on the entry thus turning faster and as soon as you hit the apex you have minimal steering left to do so you can get on the power sooner, Always good for an overtake that, i use it a lot, and i can also see the benefits if your cars understeering somewhat.

[RogerM]

front 1 way will just make it more loose off power entering a corner and shouldn't effect the on power handling.



Not true!!! I run a one-way for the exact opposite effect to what you describe in the ZX5-FS (not that the FS understeers, far from it ... I just don't like a permanent 4wd car as I'm usually turning in and braking at the same time .. 2wd style)!

With a front one-way as the front wheels can free-wheel under braking and off power so any under steer is reduced (the tires only have so much grip and thus have to divide what is available between acceleration / braking forces and cornering forces). A front one-way really helps an understeering car as now the front tires can use all their grip for cornering forces.
If you are running a one-way diff you will get a little push on a low traction surface on power as the axle will effectively be locked loosing the diff action (on a high grip surface the looking action actually helps the front dig in and forces the rear to follow it).

The best compromise is a centre shaft one-way and a proper diff in the front end.

[Big G]

sorry Roger. I haven't personally used a 1 way on high grip only low. I was forced to use a 1 way outdoors for the 1st time at Coventry MAM when I broke an outdrive, but apart from the reduced straight line braking I didn't noticed much difference. I'll have to give it a go on carpet next Friday.

[RogerM]

On short indoor tracks which are tight having the braking from a diff is worth more (as understeer isn't too pronounced on low speed stuff). I use a diff @ PDA and probably would at Hereford too, Petit ... not sure, looks like a big track so might be abck into one-way land.

[gtimax]

front 1 way will just make it more loose off power entering a corner and shouldn't effect the on power handling.

I'd start with a rear ARB since this won't effect your jumping. There are a few other changes that you can make like less rear camber 1st and more front camber 2nd you can try

THANKS GUYS
what is rear ARB?:woot:

[RogerM]

ARB = anti roll bar

[gtimax]

ok thanks a lot
how much camber for front and rear ?
thanks again:wub

[gtimax]

how much camber for front and rear for asphalt?:confused:

[Big G]

start with what the manual says and go from there

[gtimax]

i lost the manual.........:cry:

[Big G]

-1 on the rear 0 on the front.
then go from there and see what differences it makes.

someone else might have a different answer

[gtimax]

thanks a lot guys!
I tested today and it is much better, the track is very grip,
Front one way do the job , makes a hand break like feeling, break rear traction let it lose, very good off power steering.
also on power steering is good, it is very good for tight corner and hair pin, but just afraid not so good for s corner.:D