Ta05 On Power Oversteer

[DuaneB]

Hi,

I just read this thread http://www.tamiyaclub.com/forum/index.php?showtopic=50260

I have worked on the set up of my car, but still have over steer when I power out of corners. My car has a 19T motor running on a low traction surface, braking is good and straight, turn in is great, traction through the corner is great.

The thing I have been trying to fix is that I can't be as agressive on corner exit as the grip elsewhere would suggest without the car stepping out.

From the discussion of motor position in the thread above is this just a characteristic of this chassis layout (mid motor) when using mod motors ?

Thanks

Duane.

[Backlash]

What is your current set-up..??

What set-up changes have you made (if any)..??

How much toe-in are you running on the rear..??

[DuaneB]

What is your current set-up..??

What set-up changes have you made (if any)..??

How much toe-in are you running on the rear..??

[94eg!]

Provided you are using front & rear ball-diffs, my first thought is that you have the rear ball-diff set too tight. When the rear is set too tight, it will cause both rear tires to spin on-power making the rear end come out. If you loosen the rear diff, on-power over-steer will be reduced or eliminated. Just be careful when loosening the diff, that you don't go too far. If the diff starts slipping under power, it will quickly be ruined. I would set the diff per the instructions. Loosen it up, and then tighten it again until you can just no longer slip the pulley by hand (with both outdrives locked).

If that doesn't fix the problem, try moving the rear shocks one-hole in towards the center of the chassis (at the top). This should soften up the rear end and give more traction...

[DuaneB]

Hi,

Thanks for the replies.

Its difficult to be methodical about set up here as we have a constant supply of fresh desert dust arriving on the roads all day, everyday.

My car started off completley stock and built as per the manual however when I put a 19T motor in the car, I quickly had to give up on 24mm slicks as the unavoidable dust made the car handle like i was driving on marbles. I am now running 26mm HPI X-Patterns which help a lot.

I have changed the front springs to blue and the rear to yellow (might be red, which ever is medium). Although these springs are a lot softer than the TA05 stock springs, my reasoning is that the surface I run on will never generate enough side grip to work stiffer springs during a turn.

I have the softer springs in the rear to try and provide more grip to the rear, at one time I was running HPI X-Patterns on the rear and stock 24mm slicks on the front, the car was very predicatable like this but I wasn't really enjoying the push type handling generated by lots of rear grip and not much front end grip. In the long term this might prove to be the fastest set up given that is predicatable under the local conditions.

By running softer springs on the rear I am trying to find a balance between over steer and push (understeer). My Differentials are reasonably loose.

My last change since my original post has been to reduce the rear camber, my reasoning here is that I will have more tyre contact in a straight line and can therefore be a bit more agressive coming out of corners. So far this seems to have worked, however I havent yet had a chance to see how the car handles around a fast sweeper which is where I expect to pay for reduced camber.

Any comments on my reasoning throughout are more than welcome,

Duane.