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To those that have uprated ARBS, KW, H&R etc
- TomK
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- Location: West London
To those that have uprated ARBS, KW, H&R etc
Did you reinforce the front mounting points? If not, why not?
I'm considering at some point to try some out, but it's not my preferred route to go down to control roll (but it is the cheapest!) and if I risk ripping the front subframe apart then I might leave it for a while. There have been quite a few failures around the world of this Z4M front subframe when used with aftermarket Arbs according to the internet, anyone on here had issues?
Also any clearance issues with the sump?
Thanks
ETA: mods please move this to the M-specific forum thanks, my bad.
I'm considering at some point to try some out, but it's not my preferred route to go down to control roll (but it is the cheapest!) and if I risk ripping the front subframe apart then I might leave it for a while. There have been quite a few failures around the world of this Z4M front subframe when used with aftermarket Arbs according to the internet, anyone on here had issues?
Also any clearance issues with the sump?
Thanks
ETA: mods please move this to the M-specific forum thanks, my bad.
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
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To those that have uprated ARBS, KW, H&R etc
Not helpful, but what does ETA stand for in this context? Thanks!
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To those that have uprated ARBS, KW, H&R etc
Edited to addbreezer wrote:Not helpful, but what does ETA stand for in this context? Thanks!
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To those that have uprated ARBS, KW, H&R etc
Thanks!VRSteve wrote:Edited to addbreezer wrote:Not helpful, but what does ETA stand for in this context? Thanks!
- Fishy Dave
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To those that have uprated ARBS, KW, H&R etc
Hi Tom,
It probably doesn't help but I fitted a rear Eibach arb and left the front standard.
It probably doesn't help but I fitted a rear Eibach arb and left the front standard.
Corvette C6
Mazda RX-8 race car
Now sold: Z4M Roadster, the best all round car I have owned.
Mazda RX-8 race car
Now sold: Z4M Roadster, the best all round car I have owned.
- BMWZ4MC
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To those that have uprated ARBS, KW, H&R etc
I have H&R ARBs front and rear without any reinforcement (although I did reinforce the strut towers when I fitted my KW Clubsports). I considered the risks of using a stiffer ARB, but all the failures that I came across were cars in the US being used for autocross where very high loads would be experienced. Whilst I do use my car for tight, technical tracks, it's nothing like their use. I'll let you know if mine tears itself apart!
Z4MC - heavily fettled for track use
Lotus Exige - sensible daily driver on the mods slippery slope
Westfield SEiW - in hibernation
Modified RS4 Avant - back in Blighty
S2000 GT - gone
- Vanne
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To those that have uprated ARBS, KW, H&R etc
I have front and rear Ground Control Race Arb's. Both front and rear needed modification to fit, but to be fair, these were one off custom made racing sways for my car. The front did interfere with the sump. But after the required reinforcement , it fit perfectly. Both with adjustable GC end links.
It is very nice
not sure about the rear though?? lots of guys i know who track this car undo the rear arb.
It is very nice
not sure about the rear though?? lots of guys i know who track this car undo the rear arb.
2007 EuroSpec Z4///MC Building/Developing Z4 GT3
Powered by Severn Tuning
Powered by Severn Tuning
To those that have uprated ARBS, KW, H&R etc
I put new top mounts on when I changed my springs and arbs to H&R myself and strut brace is oem
Had bmw both do it and go over car with a fine toothed comb all good
All I get and the v bars getting loose and speaking on bulk head:)
Had bmw both do it and go over car with a fine toothed comb all good
All I get and the v bars getting loose and speaking on bulk head:)
- TomK
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To those that have uprated ARBS, KW, H&R etc
No not really dave, but thanksFishy Dave wrote:Hi Tom,
It probably doesn't help but I fitted a rear Eibach arb and left the front standard.
Out of choice?
Yes I agree it seems to be ones that get used hard, but then that goes hand in hand with someone who runs uprated arbs I'd have thought? It does look like long term metal fatigue causing the issue and like you I do track my car so for me it will be something I'm definitely considering doing should I choose to uprate the arbs. The additional reinforcement plate welded in also seems to avoid any potential sump clearance issues it would seem. It's annoying though that if I were to return to stock the mount points would not be.BMWZ4MC wrote:I have H&R ARBs front and rear without any reinforcement (although I did reinforce the strut towers when I fitted my KW Clubsports). I considered the risks of using a stiffer ARB, but all the failures that I came across were cars in the US being used for autocross where very high loads would be experienced. Whilst I do use my car for tight, technical tracks, it's nothing like their use. I'll let you know if mine tears itself apart!
How long have you had the bars on the car? Have you inspected the problem areas at all?
Ok, so you did the reinforcement, and fixed your clearance issues, good to knowVanne wrote:I have front and rear Ground Control Race Arb's. Both front and rear needed modification to fit, but to be fair, these were one off custom made racing sways for my car. The front did interfere with the sump. But after the required reinforcement , it fit perfectly. Both with adjustable GC end links.
erm, not sure what that has to do with the question? Nothing to do with top mounts or springs, I don't want my front subframe arb mounting points look like this, which is what can happen with uprated arbs without reinforcing the chassis there. Look it up on interweb.D4dawg wrote:I put new top mounts on when I changed my springs and arbs to H&R myself and strut brace is oem
Ok mateD4dawg wrote:Had bmw both do it and go over car with a fine toothed comb all good
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
- BMWZ4MC
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To those that have uprated ARBS, KW, H&R etc
They've been on the car for about three years and perhaps 60% of the miles I've covered since have been on the track, with the rest divided between motorways, London traffic and country roads. I haven't looked at the subframe recently (I'm now 10500 miles from my car ) but the last time I did was within a thousand miles or so and there was no evidence of fatigue (but I do accept that failing may not be obvious until the point of failure).
As for clearance, there should be no issues with the H&R ARBs with stock suspension. Mine fitted with OEM dampers and Eibach springs. However, I had to buy adjustable drop links in order to fit my Clubsports due to clearance issues at the outboard ends.
As for clearance, there should be no issues with the H&R ARBs with stock suspension. Mine fitted with OEM dampers and Eibach springs. However, I had to buy adjustable drop links in order to fit my Clubsports due to clearance issues at the outboard ends.
Z4MC - heavily fettled for track use
Lotus Exige - sensible daily driver on the mods slippery slope
Westfield SEiW - in hibernation
Modified RS4 Avant - back in Blighty
S2000 GT - gone
- Fishy Dave
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To those that have uprated ARBS, KW, H&R etc
Yes, I was pleased to have used purely geometry changes to swing the balance into oversteer but had to add a bit more toe out than I wanted to. Stiffening the rear only with an ARB could help promote oversteer, so I fitted it, backed off the rear toe out and I am still pleased with the balance. I've not tried an uprated front ARB yet.TomK wrote:No not really dave, but thanksFishy Dave wrote:Hi Tom,
It probably doesn't help but I fitted a rear Eibach arb and left the front standard.
Out of choice?
Corvette C6
Mazda RX-8 race car
Now sold: Z4M Roadster, the best all round car I have owned.
Mazda RX-8 race car
Now sold: Z4M Roadster, the best all round car I have owned.
- RedUn
- Senior Member
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- Joined: Sat Jun 16, 2012 7:33 pm
- Location: Hertfordshire
To those that have uprated ARBS, KW, H&R etc
Ive got the H&R bars front and rear, I bonded some 5mm spacers to the subframe as per John's design.
If you disconnect bar and lie under the car and rotate the bar up and down you can see the mounting points flexing even with the spacers fitted.
If you disconnect bar and lie under the car and rotate the bar up and down you can see the mounting points flexing even with the spacers fitted.
IMOLA Z4///MR
- TomK
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- Joined: Fri Jan 25, 2013 11:50 pm
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To those that have uprated ARBS, KW, H&R etc
Thanks for that, perhaps it's not something to worry about then too much, though I agree to see whether it is failing could be difficult if there are no cracks.BMWZ4MC wrote:They've been on the car for about three years and perhaps 60% of the miles I've covered since have been on the track, with the rest divided between motorways, London traffic and country roads. I haven't looked at the subframe recently (I'm now 10500 miles from my car ) but the last time I did was within a thousand miles or so and there was no evidence of fatigue (but I do accept that failing may not be obvious until the point of failure).
As for clearance, there should be no issues with the H&R ARBs with stock suspension. Mine fitted with OEM dampers and Eibach springs. However, I had to buy adjustable drop links in order to fit my Clubsports due to clearance issues at the outboard ends.
Thanks, perhaps it is something to worry aboutRedUn wrote:Ive got the H&R bars front and rear, I bonded some 5mm spacers to the subframe as per John's design.
If you disconnect bar and lie under the car and rotate the bar up and down you can see the mounting points flexing even with the spacers fitted.
Can you point me in the direction of info regarding the 5mm spacer mod, can't seem to find anything? Sounds like a good option, in that it is reversible, rather than welding on metal? Cheers
It's 3 way adjustable right? Have you tried different settings? Do you have adjustable links also?Fishy Dave wrote: Yes, I was pleased to have used purely geometry changes to swing the balance into oversteer but had to add a bit more toe out than I wanted to. Stiffening the rear only with an ARB could help promote oversteer, so I fitted it, backed off the rear toe out and I am still pleased with the balance. I've not tried an uprated front ARB yet.
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
To those that have uprated ARBS, KW, H&R etc
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- Beedub
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To those that have uprated ARBS, KW, H&R etc
d4dawg thats not a a z4 chassis in the pic... the damper is setup like that.
we dont have subframe issues, its the ARB mounting point that is being discussed.
we dont have subframe issues, its the ARB mounting point that is being discussed.
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