What is the most cost effective rear axle mod to get decent 1/4 mile times ?

Thanks

Mark

 

i fitted solid rear beam mounts to mine,
made a noticable differance

 

6 degree rear beam properly set up, rods your man to ask his is circa 800bhp iirc and puts power down perfectly

 

a fat pair of r888's and solid mounts would be the most 'cost effective' id of thought. maybe some camber shims?

problem with the cossy's is they squat and the wheels go into negative camber.

 

Thanks for the info
What is best, shims or 6 deg beam mods ?

I was under the impression that the 6 deg mod was to help with the cornering, does it also help with the negative camber issue when the rear squats ?

cheers

mark

 

A new 6 degree beam is the best option. It helps handling and traction full stop. Stops the camber change when launching and stops the wallowy barge like feeling round the bends

 

I would have said the best option for a decent 1/4 is a live axle

 

Proper Rear Beam, Jaguar 'Power Loc ' diff, Chassis connector bars, Leda coilover, Rear Twin springs to limit dip & Toyo 888 of Dunlop DO range of tyres. That lot will allow 800bhp down in 2nd gear without a hint of the typical Cossie problems.
If you want your car simply for 1/4 miles & its not a road car best speak to someone like Danny B at Adrenaline.

 

I would live axle it if 1/4 only car, or just have the location points on the beam moved and new adjusty arms made with solid bushes.
tabetha

 

6° beam, decent diff and tyres will most likely handle the power you have

 

Thanks for all the hints

It's not going to be dedicated a 1/4 mile car, just a bit of cheap-ish fun with a stock 7 1/2" diff, T56 gearbox, 215/40/17 Yokahama parada's and souped up ford 302.

My last V8 powered Sierra used to squat hard on the line and run the tyres on the edges

Mark

 

It is the beam that causes this, which a 6° item will fix!

 

Don't know why people keep saying 6 degree beam. I think they have been brain washed by people that sell 6 degree beams like its some sort of magic number.

For pure 1/4 mile times you would want a 0 degree beam so fully trailing arms not semi. This way the camber will not change.

To improve it further you could install a de dion tube to effectivley to link both independant arms and convert to solid axle.

 

Because it's easiest and most cost-effective option for a road car...

Probably best for a car that'll never see an MOT station (ie, one that never sees the road).

 

I wouldn't call a £1500 rear beam cost effective. Especially if its not ideal for what you want to do with it. Mark is a very competent engineer and i suspect what ever option he chooses he will be making himself so that gives him free reign over the design.

The MOT station doesn't care what design your rear suspension is as long as it in good condition ie no play in bearings and doesn't bind. There are plenty of cars with de dion set ups that pass mots every year.

 

No need to get excited. Lighten up! You completely missed my point...

I know that it doesn't matter what you have for an MOT I was pointing out that going for all the expense of replacing the whole rear end design on a car that spends less than a minute of every year doing quarter mile runs is a bit excessive.

 

Where did you get £1500 from?

Most 6° rear beams are £1000. Have you driven a car properly setup with one?