Pinion King

My car is driving me nuts with traction roll, particularly through one corner. I am trying everything, softening, stiffening, roll centers up and down, sway bars, rear motor, mid motor, battery position, it just won't go away.

I have had to change my lines to be more gentle on the turn to try and keep the car flat which is costing time, even then it still lifts an inside rear wheel.

Is there something I am missing that could be causing an issue?

On another note:

I need to get a new motor for next season, what is the best one for a tight carpet track?

I am currently running an LRP X20 6.5 with a Tekin RS set to blinky.

LRP, Orca, GM, Speedpassion whats the difference with them all?

TryHard

iTrader: (4)

Where abouts in the turn is the car traction rolling? As that will help to pinpoint what you need to alter to help reduce it/get rid of it.

If it's on entry, it's mostly likely that the car is too reactive, and in effect, tripping up over the outside front going into the turn. In which case, making the car softer, and more numb helps (softer springs, lower roll centre).

If it's in the middle of the turn, then its more likely the car is too soft, and rolling so much that it tips up and over. In this case, stiffer to stop the rolling will help.

Other things to try anyway are;
Reduce droop (specifically the rear), taking away steering should help
Glue the outside wall of the front tyres (and check all gluing to make sure no tyre is rolling under itself)
Run more steering expo, making the car less reactive in the straight ahead.
Heavier rear shock oil, again helps to reduce how quickly the front of the car moves.
Lower your ride-height, if you can that is.

Could also try a front gear diff as well, as this will smooth the car out through the whole turn.

Sometimes though, there are cases where you just have to drive round it, as to get rid of traction rolling completely means the car is a dog elsewhere... had that a few times, and it does make for an interesting experience!!

HiH
Ed

DiscountRCStore

.. Maybe shocks are packing up too quickly..?

..p

pbr

iTrader: (3)

Take the shims out from a arms and widen front end how much camber ? Ride hight ?

Pinion King

I know what you mean TryHard, I had success at getting rid of it a few weeks back, but it made the car roll on every slow corner. It was great through all the fast stuff, so had to go back.

Car is rolling on corner entry.

The tire gluing helped, but it still wants to go over.

I've got the car running as low as I can, track restrictions mean I can't go lower then 5mm, so sitting at 5.5mm.

-2 camber all round.

Already have a gear diff in.

Front is running heavier oil and 1 grade spring harder then rear.

@DiscountRCStore not sure what you mean by shocks packing up too quickly.

TryHard

iTrader: (4)

What springs and so on are you running? having a look at the rest of the setup we can probably advise better.

Having said that, what you mention about running stiff spring and heavier oil on the front would suggest that the car is maybe too reactive, especially if it's going over going into the turn.

Running less rear droop should help in that situation, along with trying going to the same rear oil.

Still would be good to look at the rest of the setup.

What DiscountRCStore (Phil ) means by the shock packing up too much is that it is too resistant to the inital shock movement, i.e, the bit where the oil starts to flow through the piston. It takes too much force for piston to move. This would be related to oil weight (possible the front oil is too heavy), and piston hole size. Small piston holes = more resistance to flow = more pack.

HiH
Ed

Bar

iTrader: (1)

Are you running the standard MI5 chassis or the newer stiffer version?

Pinion King

Attached is setup sheet.

Haven't had a chance to measure my droops, they are about even front and rear, front might have just a little bit more.

DavidNERODease

Too much front camber. Start with zero and slowly increase in .5 deg intervals.

CA

Stand the rear shock up.

poochy

iTrader: (11)

please let us know if limiting rear droop helps, try zero or 1mm "uptravel" to start-im curious if it works

The Teacher

iTrader: (62)

poochy, when you going to come race on the rug with us???

poochy

iTrader: (11)

waz up teach? we might come out next sat.

MattW

Pinion king, for my money, your camber change balence front to rear looks so far wrong. Looks like you will have the rear camber link flat, or even a touch higher on inner. The front on the other hand must have a pretty big angle in it. With a sorex 24 tyre, and tyre Warmers that's going to be crazy aggressive on turn in I would think.

olhipster1

iTrader: (102)

Traction rolling..
1.25 to 1.5 front camber usually does the trick.

when just plain out of options....just put a little CA on the outer wall of the tire...super light...