T1FK Oversteer

[Cam]

Hi,

I have a problem with my sons T1FK:

He races on polished wood floor and his car is spinning out when cornering.

I have fitted softer springs/oil and will rebuild them because they appear to have leaked a bit and the front diff appears to be slightly tighter than the rear diff.

Someone lat night suggested stiffening up the front supension.

Anyone else got any other suggestions or set ups that may help.

It was so bad last night that he gave up racing after one race

Cheers

Cam

[Dave Treacy]

I'd agree with stiffening the front suspension, and here are a few other things you can try...

Increase rear toe in to 3degrees
set front toe to .5degree toe out
set droop to 2mm both front and rear - helps reduce weight transfer
check ride height - 5.5mm all round is a good start point
loosen both diffs to the point where they are "just" not slipping - trial and error here :)
decrease camber to 1 degree all round

most important - when rebuilding the shocks - ensure they are the same length in "pairs" and rebound ie. fronts must be the same, rears must be the same, but front can be different to rears (slightly - building 4 identical shocks is very tricky!)

last, but not least, turn down the steering curve on the transmitter, I suspect he's cranking the steering side-to-side in frustration

[Cam]

Dave,

Thanks for the comprehensive reply.

Regarding the spring/oil setup do you have any advice regarding a good starting setup of spring and oil weight: Front & Rear for polished floors ?

TVM

Cam

[Dave Treacy]

I don't race on polished floors, so can't offer much advice there...

I would think you need to be fairly "soft" for a polished floor, get the chassis rolling a bit, maybe 40wt oil with light blue in front - 2 or 3 holes open and 30wt oil and white at the rear with all 4 open

[Cam]

That was more or less what I was considering, although I think we have some green springs that are even softer for the back

Cam

[Jon Riley]

i used to have the same problem, i ended up buying myself a transmitter with steering rate on it, completely sorted the problem.

[Remo]

Before I can answer does the car spin going into a corner or coming out of a corner as this will require different set ups.

Say you got white springs from the FK kit all round and with 3 degrees rear tow and reasonably good rubber.

If the car spins entering the corner you should work on the front suspension like stiffening springs and oil and at the same time even reduce rear droop. This will reduce weight transfer to the front making the rear lose too much grip.

If the car spins when applying power coming out of a corner then you need more weight to the back also but if you are already using white springs then I would not go softer but I would suggest increasing the front droop and possibly a harder spring front to get more weight transferred to the rear wheels...

If its mid corner the car looses the back end try standing the rear shock a hole or 2... this will stop the rear to load up and collapse mid corner...

Just a few things to try! They you can try longer links front and rear.

Just try to picture where you need the weight to be... then use set up to get there transferred there... good luck... and never give up!! :)

[xraydad]

You could also think about trying a spool in the front, seems to work for us on wood floor - would agree with Remo on the white rear springs, greens are really to soft unless the track has almost no grip.

[John Stones]

I would screw the droop screws right out so you have the maximum amount of droop possible, this way the weight and be transferred about in large amounts to exactly where it is needed.

[Remo]

Yup try a spool... it can save lives!!!! it will take some steering bite out and powering out will be much better that a dif... but still identify where you are spinning out first...

[Cam]

All.

Many thanks for all the advice, guess what I'm doing this weekend :rolleyes:

Cam

[Cam]

I adjusted the car as per Daves advice and we tried it last week. It was better but still quite twitchy so I added 0.5 degree toe in instead of toe out & adjusted the front diff so it was a bit looser (but still marginally tighter than the rear)for this weeks racing and it appears to drive a lot better now.

Many thanks for everyones advice

Cam :)

[martinl]

On my evo 2 I found that the rear end was a lot heavier than the front, so when I brought the weight up to the min (1500g), i added it all to the front centerline about 30g. I found this reduced the over steer a lot and made the car more stable.

I think its due to a pendulum affect, once the back end breaks free the extra weight in the rear pulls the rear end round.
I've got my car set to about 60/40, the rear being slightly heavier and i find the car very easy to drive and userly very predicable.

Hope this helps

[Cam]

We turned the steering response down a little this week and it now drives like it is on rails. Almost perfect set up now

Cam :D