New 29s (Read 201,942 times)

[Saloon29s]

thebutcher said:

this is all very interesting what are the pros and cons of running a fifth arm as i see jarrod isnt???

Fifth arm? Do you mean like a link arm off the diff or a torque arm off the diff?

[thebutcher]

Fifth arm? Do you mean like a link arm off the diff or a torque arm off the diff?
torque arm

[Saloon29s]

thebutcher said:

Fifth arm? Do you mean like a link arm off the diff or a torque arm off the diff?
torque arm

I am having a torque arm. You have to have either a torque arm ar two arms/links on one side of the diff to hold it in place.

[thebutcher]

thebutcher said:

this is all very interesting what are the pros and cons of running a fifth arm as i see jarrod isnt???

sorry didnt look from pics that you were the question was what advantages does one have over the other

[Saloon29s]

thebutcher said:

thebutcher said:

this is all very interesting what are the pros and cons of running a fifth arm as i see jarrod isnt???

sorry didnt look from pics that you were the question was what advantages does one have over the other

Yeah, I haven't made the mounts yet. I don't know why a torque arm is better than an extra link on one side of the diff. I guess maybe a torque arm would give more even load distribution to both sides of the diff? Most people run a torque arm though, so they must be good!

[ministockriper]

looking good

[ex tank68p]

I'm sure that alot of people building cars have put the diff in upside down things we do and learn not to again had seen a mate do this just a few months ago

[Saloon29s]

tank68p said:

I'm sure that alot of people building cars have put the diff in upside down things we do and learn not to again had seen a mate do this just a few months ago

I'm glad i'm not the only one then. ;D

[nrp165]

imo-the rear suspension is pretty important-it governs the way the car puts power down.
in a superstock-with live (open)rear axle-a torque arm mounted to the diff centre is the logical choice to use engine torque to aid weight transfer.
to use a torque arm on an enclosed axle requires some sort of floating 'birdcage'assemby where the radius rods mount.
I feel the same geometry can be achieved with three links-and it's way easier.
if you remember-the car frankie brought out had a 3-link,enclosed rear axle.

[nzf2stocks.]

Hi Vic, would you put the third link on top in the center, or to one side or the other, or even (as I saw one one car) center bottom? Would you be able to change handleing charactoristics by where the third arm is mounted.

This seems to be an easy way to change the set up, just by having the extra mounts ready to go.

Yours in allmost total ignorance, Paul.

[Autopete55]

tank68p said:

I'm sure that alot of people building cars have put the diff in upside down things we do and learn not to again had seen a mate do this just a few months ago

Or in the case of Gary Parkes many years ago,had to do a very quick steering box change between races and zoomed off to turn right and went left!!!! DOH!!!!
The spare he had,wasnt changed internally over for the stockcar!!!

S H I T Happens and a man that never made a mistake NEVER made Nothin'!!!

[Deleted]

pete55 said:

S H I T Happens and a man that never made a mistake NEVER made Nothin'!!!

[nrp165]

Hiya Paul
like a lot of things-the answer's not that simple.....
centre of the car?or centre of the mass of the car?
I'm putting the one I'm working on basically in line (above) the driveshaft-so it's in line with the engine/gearbox/diff head-the car's offset,so that's not in the centre of the car.
seriously thinking about running backwards,too-a la FWJ-packaging's much easier.
Vic

[nzf2stocks.]

My old car has a 4 link and panhard setup, with the top links facing forward and the bottom links to the rear. I think they used to call this reaction suspension as it uses the torque forces to push the diff into the ground, the drawbacks are that with suspension travel the diff rotates the opposite way and causes the driveshaft universals to bind up, and you get a lot of instability when going from power to braking. It works well if you have the power of a super stock but the stockcar motor doesnt have enough power to make it work properly, and I guess the goemetry needs to be spot on to avoid binding. A three link setup like this would put a lot of strain on the diff housing or birdcages. Wouldn't a touque arm set up work better?

[22kBullRacing]

On my car 22k i have two arms on bottom from the torsions going to the back & two tractor arms on top going forward also have torque arm that i have made mounted on the front of the diff to the chassis on the left. Have tried with out it but the car gose better with it. But i wounder if it would work better on the right side of the diff head. any thoughts on this.

[Saloon29s]

hemi245 said:

On my car 22k i have two arms on bottom from the torsions going to the back & two tractor arms on top going forward also have torque arm that i have made mounted on the front of the diff to the chassis on the left. Have tried with out it but the car gose better with it. But i wounder if it would work better on the right side of the diff head. any thoughts on this.

Wouldn't the two arms from the torsions be for your suspension?

[22kBullRacing]

Yes thats right they are.

[Autopete55]

hemi245 said:

On my car 22k i have two arms on bottom from the torsions going to the back & two tractor arms on top going forward also have torque arm that i have made mounted on the front of the diff to the chassis on the left. Have tried with out it but the car gose better with it. But i wounder if it would work better on the right side of the diff head. any thoughts on this.

Whichever side you mount your lift arm,will promote 'acceleration' or drive on that side.
So with that in mind,do you need to get drive off the RR or LR when coming through and off the turn.??
This will depend on how the car is set up and what the driver prefers.

This thread is getting bigger all the time and getting a bit off subject...........How is the new 29s coming on??...........

[MadMarty13B]

I dont have or need a lift arm as always someones front bumper gets me going well of the turns

[Saloon29s]

Getting there slowly. Dad is coming up today and we are going to remount the shock mountings on the diff (with the diff the right way up) and probably cut out some plates today. I'm a bit held up at the moment, waiting for Mr O'Halloran to get back from his holiday so he can make my link arms. Once he has made those for me I can then mount the diff completely and also the front end. From there I can work out where the seat mounts, the side rail and wheel guard length, make the engine mounts and so on. Everything has a flow on effect doesn't it?