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#1
04-08-2010
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my cat does doughnuts!
Apart from the SPUR/idler problems that I have been posting about, when it actually runs - it runs very well.
However when I turn into a corner it grips very well and powers out fine. However if I am a touch overstrong on the cornering the CAT literally does a doughnut! I do not have to be going fast for this to happen, and even happens if I dont increase the power. Its as if the rear end is trying to swing by the the front wheels  Ive tried 40 and 25 in the rear suspension oil, didnt seem to make much difference. I have set the camber, ride height etc. Ive even tried the same tyres on my B44 and the B44 does not show this doughnut'ing, so it isnt the tyres. All screws/nuts/positions for the suspension etc are set to the middle hole. If I reduce the turn on the transmittor then it loses's the ability to get round hairpins  so I would rather fix the problem on the car rather than hiding it with a transmittor fix.Any other settings I could try and change? 
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#2
04-08-2010
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Whats the setup on the rear end?
Have you tried using a softer spring? Check the rear diff isnt too loose
__________________
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#3
04-08-2010
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I would try a softer rear spring as it seems like the rear is not getting enough grip.
Carl
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#4
04-08-2010
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Hmm I'm not a cat man, but it sounds like the front maybe colapsing mid corner thus giving a sudden fist full of front end grip and the weight transfer going to the front, when mid corner, No weight on the back = no grip and the car will just snap out
Im no set up man but maybe heavier front end, oil & spring, poss tigten the front diff a bit maybe the outer row on the front tyres 
__________________
Dave  www.norfolkbuggyclub.moonfruit.com kyosho optima,Bosscat,Boomerang,,RB5 Vega,RB7,,RC12 5.2, TLR22-4,MP9,HB807T Flask of tea & a rollup Anglia model centre & CT Models http://www.oople.com/forums/showthread.php?t=28117
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#5
04-08-2010
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thanks guys. I wont have a new set of springs before Friday (race night) - but I can try adding some weight to the backend first.
As for the diff setup, its per the manual, tighten right up and then slacken back by 90degree's. So to make it any tighter Ive only got quarter of a screw turn to play with.
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#8
04-08-2010
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Quote:
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#9
04-08-2010
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Quote:
(if im reading that right)
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#10
04-08-2010
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tighten up the front diff so it feels slightly to tight, and try that it should make the car drive more from the front coming out of the corner, forget what the manual says about 90 degrees turn back,
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Mattys the driver,my names carl
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#11
05-08-2010
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Took me a while to work out how to stop my CAT from swapping or rotating ends off-power.
I ended up running heavier oil 35wt Associated with yellow springs at the front. 30wt white springs at the rear. I drilled holes in the rear of the back wishbones and run the shocks at the rear also. I also changed to the 1deg rear hub carriers. I've also tightened up the front diff to soften the steering. Car doesn't want to swap rotate as much now but is still lively. I feel I need to soften the rear more and will try the new big bore's as they seem to be very good on my new cougar.
__________________
CAT SX, Cougar SV Slash 4x4, B4 Vintage Rough Rider with all the 80's mods
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#12
05-08-2010
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Quote:
Reset your toe aswell. The increased ackermann takes out some of the steering.This will calm down the back end as this will deliver a more predictable handling. Cruise
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Team CS-Electronic Team Schumacher
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Schumacher
Linear Mode
