bad launches..

[CHB]

Man, weld it if its for drag, wether it single legs now or not, power isnt even until its fully locked. Even an LSD will slip differently between wheels...

You want full power to both wheels to ensure limited wheelspin and maximum thrust (im pretty sure thats the name of a porno)

And if you are running slicks, run a lower tire pressure, small burnout (dont want to delaminate) and soft rear suspension to allow the car to bog...

Cheers,
Jase

got it mate. about rear suspension, how should the absorber to response? compress fast and extend slow or the other way round?

[andrew_mx83]

Limited Wheelspin and Maximum Thrust was one of the best pornos ever!!!

[oldcorollas]

Yeah, I agree. Sorry it was a bit hard to understand, but I meant just welding up your current centre. I have heard rumours of a rare E series LSD, but personally I don't believe them.

And yes, you have both wheels spinning now, but maybe with a smoother (but also faster) launch will you start to get a single wheel spinning. So I think you need more "testing" before deciding to weld or not.

Hen

are E series anything like S series LSD's (same axle size but...)

[Smokey228]

got it mate. about rear suspension, how should the absorber to response? compress fast and extend slow or the other way round?

I'd say thats spot on, for the rear...

But on front, you want extend fast, compress slow for a proper drag car... That way it keeps weight on the rear wheels...

Cheers,
Jase

[NME308]

Soft rear suspension is for porno's not drag racing.
You do not want 'bog' if what is being referred to is what a drag racer knows as squat.

When a car squats in the rear it is NOT because it is transferring weight!

If a car squats on launch it can look spectacular, but despite common misconception it is actually because the car is lifting the diff up - not because weight is being transferred to the rear, thus very poor traction...
The condition of squat is a reaction of suspension which is trying to act with a focal point way below the vehicle's centre of gravity. Squat is also commonly accompanyied by axel chatter (I destroyed a couple of Turbo400 auto transmissions in my younger days with axel chatter...).
As I posted above the rear suspension needs to be aimed around the middle of the drivers seat back ideally. When suspension is set up reasonably well instead of pulling the diff up under the car on launch - the diff will be forced downwards toward the 'racing surface'. As the diff is forced downward the suspension is pulling through the imaginery intersection point, as this point is as close to centre of gravity as possible the vehicle's mass is dragged over the rear axel by acceleration acting over inertia, and even more traction is available. On a drag car with large amounts of adjustment spectacular wheelstands can be dialled both in or out at will!
If you can get your rear suspension acting with you i.e. car planting the diff rather than squatting down over it then you actually need heavy duty rear springs to help prevent the weight shifted over the rear end from pushing the diff back up and ruining the traction just as it was starting!
For drag racing a set of 50/50 oil shocks in the rear, and a pair of gas 90/10's in the front is standard fare. For a street driver the 90/10 shock is a bit hard to live with cos 90% of its effort is directed to preventing the shock from coming back down and only 10% to resisting it going up in the first place.

An open diff will usually spin the drivers side wheel due to the torque transfer of the driveline. The fact that CHB's car is spinning both wheels and turning right while doing so indicates it is (for whatever reason) fully locking up under abuse! As also covered in a post above due to driveline torque transfer a car will tend to lift the drivers side rear wheel (not visibly into the air!) enough to cause drive to be transmitted more through the passenger side rear wheel - hence the car heading right. This is countered by carefully adjusted sway bar as per above post.

Cheers