Handmade rear ARB - Alfa Romeo Forum
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(Post Link) post #1 of 11 Old 19-03-15 Thread Starter
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Handmade rear ARB

I made an ARB for the rear axle of my 156. It's 20mm diameter (14mm stock, 16mm gta and 18mm eibach's) and used 7075 alloy for the vertical parts and 3 holes on each side to adjust it.
Front ARB is stock for now, to check the drivability of the car and will be upgraded to 23mm from 22mm now, if needed.

some pics here:
IMG_20150318_161911 by SotirisAlfa, on Flickr
IMG_20150318_161924 by SotirisAlfa, on Flickr
IMG_20150318_172757 by SotirisAlfa, on Flickr
IMG_20150318_172744 by SotirisAlfa, on Flickr

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Nice work!
But is that joint not going to wear out and begin to flex ?
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How heavy is it versus stock??
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Adding stiffer rear ARB will increase sudden oversteer of the car, and when FWD car starts to oversteer you need a miracle to avoid spin......increasing rear ARB that much IMHO will need at least 26mm front bar in order to keep some balance.....
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I have 21 rear an stock gta front and no problems.

@Sotos, haha looks similar design to mine
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Nice Sotos. I still need to get my rear ARB stiff... No time at the moment
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(Post Link) post #7 of 11 Old 20-03-15 Thread Starter
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Quote:
Originally Posted by cannotstop View Post
Nice work!
But is that joint not going to wear out and begin to flex ?
I agree. I'm waiting for a faster wear of the joints but its very low cost to change them more often.

Quote:
How heavy is it versus stock??
I didn't weight them but the new one is about double weight.

Quote:
Adding stiffer rear ARB will increase sudden oversteer of the car, and when FWD car starts to oversteer you need a miracle to avoid spin......increasing rear ARB that much IMHO will need at least 26mm front bar in order to keep some balance.....
After some fast driving on mountain roads, the car feels much more flat and secure, still keeping the front 22mm arb. I will go for the gta's front arb sometime just to keep car's behaviour balanced on my mind. Now the rear arb is on the softest setting.
Quote:
I have 21 rear an stock gta front and no problems.

@Sotos, haha looks similar design to mine
How do you feel the car with 23/21 arbs? Did you ever have it just with the rear 21 and stock front and check for differences?
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Well for the last year my car is just for trackdays. But i had it on the road couple of times with stck 22 front and my 21 rear. Front end grip was so good that rear couldnt keep up (i had a little toe out at rear because i like oversteer)
On nice smooth roads it was great fun, but over some rough surface in a corner rear would loose grip easely, you have to be prepared

23/21 is much more balanced and predictable, for me perfect combination. I have two holes on rear arb and for tighter track i use harder setup, for faster tracks the softer one. It's one of the best upgrades!

I recommend you front gta arb, it will still be fast and gripy but a litlle safer and easier to control the rear of the car.
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(Post Link) post #9 of 11 Old 20-03-15 Thread Starter
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Quote:
Originally Posted by alan Q4+33 View Post
Well for the last year my car is just for trackdays. But i had it on the road couple of times with stck 22 front and my 21 rear. Front end grip was so good that rear couldnt keep up (i had a little toe out at rear because i like oversteer)
On nice smooth roads it was great fun, but over some rough surface in a corner rear would loose grip easely, you have to be prepared

23/21 is much more balanced and predictable, for me perfect combination. I have two holes on rear arb and for tighter track i use harder setup, for faster tracks the softer one. It's one of the best upgrades!

I recommend you front gta arb, it will still be fast and gripy but a litlle safer and easier to control the rear of the car.
Thanx for the tips Alan!
Now looking for a front 23mm arb although the car is daily road used. I believe as you said, it will be more balanced.
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I bought a 23mm arb with powerflex bushes for the front.
Alan, what did you do with the drop links at the rear? Do you stil use stock ones or something else?Could you please give a picture of that point?
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I'm still on stock plastic ones, when they wear out i'll make them form unibals and some M12 threaded bar.



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