Custom Anti Roll Bar- Cheap opportunity!

Has the length of the hex section now been determined? I thought the 140mm shown on the other bar earlier in the thread was a bit too long??
 
rp61973 said:
Has the length of the hex section now been determined? I thought the 140mm shown on the other bar earlier in the thread was a bit too long??
Click to expand...

As a starting point and allowing for possible car-to-car variations, 140mm to the end of the radius runout looks a good starting point. May, or may not, be scaled back for future supplies. After nitty-gritty discussions with the supplier the other day, the prototype he's making won't be a full regular hexagon beyond 40mm from each end

Early days yet.
 
Update

I've now got the initial ARB sample.

I'll try and get it trial-fitted to Occie early next week. Once I know it fits OK, I'll put some pics up and have a word with Tim regarding testing.

Stan
 
Put up a photo when you get the chance Stan :)
I'm thinking along the lines of adjustable coilovers currently but am still interested in an uprated bar.
Hope the results live up to everyone's expectations!
Jim
 
OK...a couple of pics of the bar's business end. The sample bar, as supplied from Steve, was unfinished so I gave it a few coats of primer and satin black.




There's a full 11/16" A/F hexagon for the first 50mm (that's 2" approximately in harvey-speak :wink: ) from each end. Beyond that, just 2 of the flats are extended a further 90mm or so for clearance of the inner bracket.

I was going to get my mate to give me a hand fitting it to Occie tomorrow, but I had a bit of time this afternoon so I thought I'd do it solo. The only downside in this is I've managed to scratch the paint up a tad! :roll:

The bar's made from 1" material and comes mighty close to the inner wing. but does clear it...just.




I've got to nip over to Loughborough in the morning to give a mate a hand, so see I'll see how the car feels initially. If it's OK, I'm thinking now of keeping it on Occie for the run up to Bowes so people can have a look, after which I'll let the rally guys have it.

Stan
 
Looking good, that transition radius whilst not too abrupt is none the less relatively short given the flex duties it must perform.

I would suggest some high speed roundabouts and corner transitions to see that it is robust enough against breakage.

This is the NZ By Gone autos transition....



Cant wait to see your review of road performance.

Graeme
 
I agree, Graeme...I did mention this to Steve when I picked the bar up.

As you say, proof of the pudding etc..... I think the real testing will come when Tim and Gavin give it some welly, but I'm looking forward to having a go! :)

Stan
 
Don't forget to nip those bolts up again, after a few miles have been completed .
gerald
 
Took Occie for a 20-mile run yesterday, incorporating some 50-60mph curves and fast-ish roundabouts.

Similarly to Graeme's experience with the Bygone Auto ARB body roll is still more than a modern, but I wouldn't want to lose all of it anyway as (for me at least) that's an integral part of the P6.

That said, I did notice a reduction in the roll and the car felt noticeably tauter.

In the 6 years I've had the car, I've never had the front springs off, and they're (probably) original. Equally I've never changed the front dampers, but I've got a pair of NOS Woodheads so it's a job on the to-do list at some point. Occie runs 205/60 Goodyears on 6.5J x 15" SD1 Vitesse rims.

I think Tim and Gavin's car will still be the favoured test bed for a dispassionate view, after Bowes in a couple of weeks.

Stan
 
If there are any tight corners in Bowes area, to get the infamous lurching going, I can take you for a quick spin around them in Sparky.

That will give you some idea of how much body roll the uprated anti roll bar removes. If you like?

Cheers

Richard
 
Looking at the picture of Occies new ARB I am wondering how tight the ends are suppused to be made up. I see there is a slight gap there and would think that leads to more strain on those 2 bolts hoding them. Would it not be better if the gap was just closed?
 
quattro said:
If there are any tight corners in Bowes area, to get the infamous lurching going, I can take you for a quick spin around them in Sparky.

That will give you some idea of how much body roll the uprated anti roll bar removes. If you like?

Cheers

Richard
Click to expand...

Sounds a good plan, Richard. Equally, we might get a spin in Occie for your opinion.

Look forward to catching up with you again.

Stan
 
Barten said:
Looking at the picture of Occies new ARB I am wondering how tight the ends are suppused to be made up. I see there is a slight gap there and would think that leads to more strain on those 2 bolts hoding them. Would it not be better if the gap was just closed?
Click to expand...

Hi Barten,

The ends are the same 11/16" A/F hexagon as the original bar. The slight gap is also present, at the bottom of both the fixed location and the clamp, on the original fitment.

I think the idea behind the design was to locate the bar on four faces to eliminate any possibility of it loosening, which might be possible if the two faces were touching.

Stan
 
Any further news on this? I am getting the impression that the up rated ARB is not quite living up to expectations. Does it really make a discernible difference sufficient to splurge £100+ in the hope that the magic jelly ride may be tamed?
 
Having read all this right through, in my humble opinion, as an engineer, it wont make hardly any difference with a few mill thicker bar. Especially with thinner hex ends. It will just put more twist into the ends, which will fail, quite soon. To make any difference on such a heavy loaded torsional force, you would have to at least double the thickness. So my answer is no its not worth over £100 for a flawed design. which will be prone to failing.
 
Dangermouse said:
Having read all this right through, in my humble opinion, as an engineer, it wont make hardly any difference with a few mill thicker bar. Especially with thinner hex ends. It will just put more twist into the ends, which will fail, quite soon. To make any difference on such a heavy loaded torsional force, you would have to at least double the thickness. So my answer is no its not worth over £100 for a flawed design. which will be prone to failing.
Click to expand...

Mine is a 1" bar with machined 11/16" ends and it makes a remarkable difference.

It cost me £200.00 a few years ago, and is worth every penny of it.

Richard
 
I can't see Bruiser from the outside on a bend but when I do take one (with the stiffer springs, shocks & on the Revolution's) it certainly doesn't feel as though there is much of a lean & I don't really feel the need to reduce the speed very much, if at all, especially in the dry. So I'm not sure that a change of roll bar will make any noticeable difference in my case. On a standard set-up, I imagine any effect would be far more noticable.

I'll wait for further results & opinions though as I'm not an engineer or even a reasonably talented mechanic, so bow to the more experienced among forum members. :wink:
 
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