Cougar that pulls to left on power

[martgifford]

I have a Cougar the pulls to the left when on power. It did it at the track and also when testing at home. I have measured every tie rod and shocks have been rebuilt. It's not weight either as the esc is on the right of the car which is heaver then the rx. As I have worked out its when it accelerates it is possible to be the diff? Is this a natural tendency? I think thats all that's left. As driving slow in is fine. It's something to do with the transmission it think

Can anyone help

Thanks

[slow bob]

Mine always pulled left on power aswell as many others who owned a cougar sv. never figured out exactly why even after changing to a new diff/rw gears/new gearbox/bearings ect ect ect ..

[martgifford]

Sounds a bit of a defect to me. I hope not. Thanks

Anyway of rectifying it? Apart from buying another car!

[kayce]

Originally Posted by martgifford

Anyway of rectifying it? Apart from buying another car!

Grandpa used to like to say, while regaling his farming days, "There is only three things you can do with a horse that pulls to the left: plow crooked rows, tug extra hard with your left arm, or shoot the damn thing and put both of you out of your misery."


Sorry, couldn't resist

[martgifford]

Thanks for that

I am running a 6.5. Should I put a bigger pinion on to slow acceleration or possible put a 10.5 in to slow down that initial acceleration and hence that on power left bias. Add more weight to the car? Lower the car?

Help!

[kayce]

Originally Posted by martgifford

Thanks for that

I am running a 6.5. Should I put a bigger pinion on to slow acceleration or possible put a 10.5 in to slow down that initial acceleration and hence that on power left bias. Add more weight to the car? Lower the car?

Help!

Scaling back power is never really a bad thing, being as a car that is already a handful never gets better doing whatever it does bad faster.
But I always seem to have less motor than half the guys in the field, and my only issue is dodging them as they're bouncing off the walls. And a 6.5 just seems like a LOT of motor, unless you're ultimately talented behind the wheel or running a track the size of a football field.

[ASKay]

I had this for a moment before my diff went kaput..... Check the diff first... maybe in need of a circlip, and washer kit, if its issue is the same as mine...

[Chillout47]

The only time I had a car do this is when the chassis was broken, it was a small break though and hardly noticeable. This allowed the car to twist under ful power. I'm sure you would have noticed if the chassis was broken, but make sure all the screws are in properly on the bottom of the car, also is the top deck fixed properly? if this is not right it will twist the chassis. I think your car is twisted or twisting under full chat.

Good luck, PM me if you cant fix it, I'll give you £40 for it ;-)

[martgifford]

Thanks for everyone's advice. I think I will put a 10.5 in and re do the diff and check the chassis over

Thanks

[Cruise]

Check your outer hingepins they can bend,and if bent you´ve got different toe left/right.

Cruise

[Fletch248]

a few idea..

Does the suspension move freely when the shock is not attached?

Is the rear ally block bent (3 degrees or 4 degrees one) ?

all the bearings are free ?

To much play on rear wishbones ?

just a few things i would check.. hope this helps

[tisher]

never had a problem with mine pulling. just back the slipper off a bit and try that

[Captain nemo]

I had this on mine shortly before my diff pulley melted check your riffs tight enough or not too tight

[john333]

Originally Posted by martgifford

Thanks for that

I am running a 6.5. Should I put a bigger pinion on to slow acceleration or possible put a 10.5 in to slow down that initial acceleration and hence that on power left bias. Add more weight to the car? Lower the car?

Help!

A 6.5 is a hell of a motor for 2WD, I've had to turn my speedo down to stop it wheel spinning LITERALLY the length of the straight, so if your diff is needing some attention it will show by doing something weird like pulling one way or the other.

[moth898]

I went through this last year, two things are causing this, weight balance and bias. Because the motor ass and speed are on the right, the left wheel unloads under power and breaking, this thread explains it http://www.oople.com/forums/showthre...perfect+cougar

Now if you still see the rear unstable, you need more rear weight bias. Shave the rear arms at the inner and outer hinges to bring the hubs forward. Put the shocks behind the towers. The new inline steering arms will also help alot. Last two things, put the plastic shim along with 2 mm washers under the camber link. Then add weight. Trishbits sells a brass bar that screws to the chassis between the motor and battery. What I like is sticking lead golf tape under the chassis at the tranny. Hope this helps you.