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Old 13-01-2021, 20:01   #1
Tim M
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Evo 6 Arms Better than Evo 5?

Greetings!

We are renovating an Evo 5 back to roadworthiness and considering replacement of the rear suspension with Evo 6 aluminum arms.

What might be the weight difference?

Is there much benefit?

Thanks!

Current setup...

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Old 13-01-2021, 20:12   #2
Pushpex
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They're already aluminium arms...
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Old 13-01-2021, 20:22   #3
Tim M
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Apologize, meant we are thinking of replacing the steel rear arms on our Evo 5 with aluminum Evo 6 arms (other than the top arm which is aluminum on both).

Thanks!
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Old 13-01-2021, 20:34   #4
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I have done it on my 5rs . Loads of difference in weight . The 5 steel arms are heavy!
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Old 13-01-2021, 21:11   #5
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Sorry, from the lighting it looked like the trailing arm was also aluminium. I replaced them on my 4, there's a fairly significant unsprung weight difference between the arms, but I guess it depends on how you use the car if you'll notice it when driving. Unfortunately I didn't drive mine much before replacing them so don't have much to compare with
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Old 14-01-2021, 22:23   #6
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alloy arms are around 25% lighter thats it really ,if you can tell that driving your in the wrong job

if you can find a nice set of clean alloy arms then go for it but a rattle can of silver paint makes steel ones look alloy in no time and at a fraction of the cost
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Old 14-01-2021, 23:03   #7
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Aluminium is about 1/3 of the weight of steel, to retain the strength you need to use more however the aluminium arms didn't seem any thicker than the steel ones, mainly because they were over engineered in the first place (most suspension arms these days are stamped sheet steel like this



instead of the great big lumps of cast iron on the earlier models). That's not to say the big lumps or iron aren't good, they're obviously bombproof hence why they are on the RS models, and I didn't really have a good reason for changing them other than I wanted to spend some money I guess, but there is definitely a significant unsprung weight difference.
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Old 15-01-2021, 18:53   #8
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Appreciate the responses. Was trying to rationalize the purchase...;-)

A new bushing or two and rose joint with the labor per arm takes a bit of a chunk out of a new purchase.

Thanks.
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Old 16-01-2021, 11:03   #9
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Where were you getting the arms from? There's still some 6 arms pretty relatively cheap from the place I got mine, then new ralliart bushes from rosssport
I think my local garage charged me £200 labour to push the bushes in, you could probably do it yourself with a ball joint press, but a hydraulic press would be easier, and for the £200 I spent on labour I could have got one from machine mart Hindsight...

No point trying to justify things, if you want to do it you should It's not like we're allowed to do anything else these days
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Old 16-01-2021, 18:38   #10
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The later Evo 5s had aluminum arms, it was a mid-generation changeover. There's no drawback to using the aluminum arms and they are direct replacement.
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