just change the rear to 24mm marco, the better dampers will control the changed spring rate in roll. Leave the front alone.

I have driven both back to back in 2 seperate cars to the limit and beyond. There's not a lot in it. 22 or 24 is a decent improvement over standard. I'd go for a 24mm as the overall handling was still to understeer if you just pushed on. But it gives you a little more scope for swinging the back around if you want to.

TBH both cars had various other differences in the suspension and the car with a 22mm bar out handled the other because of the rest of the package

If you drive only on the road a 22mm will be fine. I cant see anyone pushing the car enough on the road to really say they need a 24 over a 22.

Id leave the front bar alone

What is the diameter of the Dedra front arb?

What is the diameter of the standard 20vt front arb?

The dedra is about 25-26mm(i have not got calipers).
Suba, maybe "unstable" is the wrong word to describe toe out,slightly more "nervous" would be a better description, also I think it makes the steering feel lighter,which is not desirable in my mind.

Yep - that fits. I spent ages getting my coupe to feel like that!

guys, im really going crazy on this...

forget fitting and every thing else.. lets look at just whats better...


22mm rear arb
3 people


24mm rear arb
3 people

24mm arb + Dedra front arb
1 person

22mm arb + dedra front arb
2 people

right... not getting any where quick lol
3 & 3 for the 22mm and 24mm rear arb's.

ive decided to hold off buying one today and going to see how this thread turns out!

Again, I think this depends on the various mods everyone uses..
If you aim for a full racer Coupe then you'd advice the 24mm+Dedra, if you're the occasional trackday entusiast you'd be happy with the 22mm rear ARB.
My 5 cents..

well at the moment the car is used for my fun!
i play wsith it nearly every day, enjoy driving it and when i can and its safe push it to the max.

this year i plan to get more track days in.

but i would also like to get it to the stage where i could turn up at TOTB with out worrying my spec is not on point.

i do understand its all down to choice, but luckily, people have been there and done that so im in the best palce to get the right info for one of the best set up's with out spending £2000 on Gaz coil overs!!

for me the best test of this set up will be in spa...

There is no right and wrong answer - how you get the car to behave is down to personal taste.

I would leave the front bar alone for now and go 22mm on the rear - play with the alignment, and if you feel that the front is too sharp, or that there is too much body roll, then go for the front bar as well.

i was expecting an answer like that...

im not going to play with the front bar.
The only way i would do that is if i was going to buy the Eibach kit... but i cant afford that at this moment in time.

the problem im also having is getting brilliant advice from well trusted people...
BUT some are telling me 22mm some are saying 24mm

all of them can drive and know how to set the coupe up for track and road fun.

and i trust all of them.
decisions decisions....

personaly im tempted by the 24mm...

i think i need to kit the suspension first and see what the car...
if i feel a minor tweek to the rear then a 22mm will be the key.. but if it needs more work, then of course 24mm and if it still needs it more...

come back and ask you guys what else can i do lol

I'll simplify it for you:

1. 22mm - easy to fit
2. 24mm - pig to fit

result:

Both will do the job.

As well as Suba's advice, you also need to consider than a 24mm rear ARB on completely stock suspension would probably be too much and you'd have a very twitchy car, especially when lifting off, mid-bend

So - here's my recommendation:

If the suspension is staying stock, go for 22mm

If you're fitting uprated shocks AND springs, go for 24mm

Nigel, im going for Koni socks and eibach springs!
standard shocks are a bit too boring for me!

fitting will not be that bad, i will be doing it on a ramp at my mates garage!

so looks like 24mm will be the better choice of the 2!

I would say so, but that's only my opinion. My car still understeers with a 23mm rear ARB and a standard front ARB, so if I had my choice again, I'd go for 24mm

However, I can get the rear end of my car to step out if I provoke it a little. Because its set up to be neutral, its all very predictable, but if you go too far, it can become unpredictable, which is no fun, and just slows you down, as you've no idea if the car is going to grip and turn, or just spin.

You'll be fine with Billies and Konis and a 24mm ARB

i see what you mean Nigel!

i think the choice will be a good one!

of course Nigel if your not happy with your set up and fancy a re-sprayed sprinty with a zender kit, i wouldnt mind swapping for the moonie!!

You'll never dial out the understeer completely, there is just too much weight in the nose of the car.

You're right about keeping it predictable for road use - I have no doubt that I could drive my old 20VT faster on some B roads than my RX7 - primarily as it was much easier to correct when it started to slip, so you could really go for it.

And just to confuse the issue even more, Marco ...

I had a 22m rear ARB with standard front ARB and it was very neutral and very predictable.

Of course it still understeered at the limit (or lift-off oversteered if provoked), but (as such) as massively easy to drive very quickly.

[It's fun this, isn't it? We could keep him from ever buying a new ARB ]

LOL!

Oh FFS sake Dave.

I loved the feel of your car.

No no I'm staying strong and buying a 24mm rear arb.

Dave your welcome a go in mine to see what you think!!

but hurry up Dave, he'll have smashed it up in no time

LOL proccy!

Me crash proccy!?

Suck my nicely shaved plums!!

I found it. Front arb is 23 mm.
Rear one is 19 mm.

I second that!

Quick question:

What size is the standard rear ARB and roughly how much extra strength (springyness/force) does the 22MM provide?

Thanks

Look two posts up from yours ^^^

just to put an end to this one!

im buying the 24mm rear arb!

thank you and good night!!

Is that your final answer?

Are you sure?

You sure you dont want to phone a friend.... oh no wait....