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      02-12-2015, 08:57 PM   #1
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Robbing the F8x M3 M4 for suspension parts

HP started the R&D process back in 2008 with the E9x chassis and is at it once again with the F series.

Our R&D is on a F32 435i, but any models that shares this platform can benefit from this upgrade.

Part #10 in the illustration below is the wishbone we are upgrading here. This particular arm in OEM(F3x none M) form can deflect because of the rubber bushings and rob you of valuable camber during cornering. The F8x M replacement is a much more robust arm with a bearing, which has less deflection and camber loss. The F8x arm is also slight longer for a tiny bit of much needed negative camber gain. Camber gain is -0.5 on this particular car, but can vary bit due to manufacturer tolerances and other suspension mods.

More details here:

http://www.hpashop.com/F8x-M-upgrade...ne-upgrade.htm
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Last edited by HP Autosport; 03-25-2015 at 04:39 PM.
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      02-12-2015, 08:58 PM   #2
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      02-12-2015, 09:24 PM   #3
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How would these compare to the ones Megan sells?

http://www.meganracing.com/products/...sp?keyword=f34
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      02-12-2015, 09:44 PM   #4
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Quote:
Originally Posted by Mike_L View Post
How would these compare to the ones Megan sells?

http://www.meganracing.com/products/...sp?keyword=f34
Those are not of the same arms!
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      02-12-2015, 09:50 PM   #5
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Quote:
Originally Posted by HP Autosport View Post
Those are not of the same arms!
None of them? I'm having a hard time placing them. How many damn arms do these suspensions have??
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      02-12-2015, 11:17 PM   #6
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Quote:
Originally Posted by Mike_L View Post
None of them? I'm having a hard time placing them. How many damn arms do these suspensions have??
Front is a strut set-up with 2 links and the rear is a 5 link with a shock, add them up and you have 14 links if my math is correct.
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      02-13-2015, 04:03 PM   #7
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Hi Harold

Why won't these upgraded LCA fit m235i ?

Why not the f8x tension strut as well ?

Is it because of the xenon headlight levelling rod ?
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      02-13-2015, 06:09 PM   #8
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Nice work. Curious to see what other suspension parts can be switched over.
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      02-14-2015, 01:55 AM   #9
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Do you think the f80 struts and springs fit?
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      02-14-2015, 11:39 AM   #10
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Nice! finally some OEM direct bolt on suspension upgrades. Since it slightly changes camber I would assume that an alignment would be a good idea afterwards.

Will be on the lookout for some reviews before I pull the trigger! I had the m3 control arms on my old e90, so hopefully this upgrade will yield a similar benefit.

Appreciate the research!
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      02-14-2015, 12:40 PM   #11
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Quote:
Originally Posted by infinitigor View Post
I had the m3 control arms on my old e90, so hopefully this upgrade will yield a similar benefit
I did the LCA and TS upgrade on my e9x as well and liked the tighter/keener front end hence keen to understand why only LCA for F series.

Installing mis-match lower suspension parts (longer f8x m3/4 LCA and stock TS) must effect castor and steering.
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      02-14-2015, 12:50 PM   #12
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Quote:
Originally Posted by Bee Pee View Post
I did the LCA and TS upgrade on my e9x as well and liked the tighter/keener front end hence keen to understand why only LCA for F series.

Installing mis-match lower suspension parts (longer f8x m3/4 LCA and stock TS) must effect castor and steering.
I'm sorry I never heard these LCA and TS terms ever before, & I thought I knew a thing or 2 about suspension haha!
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      02-14-2015, 01:24 PM   #13
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Quote:
Originally Posted by Bee Pee View Post
Hi Harold

Why won't these upgraded LCA fit m235i ?

Why not the f8x tension strut as well ?

Is it because of the xenon headlight levelling rod ?
We have not done a M235i so I don't want to say these arms will fit.

F8x tension arms will be next as we have limited time on this particular R&D. No, there is no issues with xenon or not as you can see we have the rod on the M wishbone.

Quote:
Originally Posted by infinitigor View Post
Nice! finally some OEM direct bolt on suspension upgrades. Since it slightly changes camber I would assume that an alignment would be a good idea afterwards.

Will be on the lookout for some reviews before I pull the trigger! I had the m3 control arms on my old e90, so hopefully this upgrade will yield a similar benefit.

Appreciate the research!
Yes, alignment after the installation is required. It's just like the E9x chassis as far as camber gain.
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      02-14-2015, 03:16 PM   #14
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Harold,

Subscribed for both LCA and TS upgrade.

Having seen benefit on my E91, now keen to do this upgrade on my f2x. More camber would be very helpful even it just reduced the wear on the softer compound on Michelin PSS outer shoulder.
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      02-14-2015, 03:18 PM   #15
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Quote:
Originally Posted by infinitigor View Post
I'm sorry I never heard these LCA and TS terms ever before, & I thought I knew a thing or 2 about suspension haha!
LCA - lower control arm
TS - tension strut

Bmw speak for 2 part front lower wishbone arrangement
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      02-14-2015, 08:05 PM   #16
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Sounds good. I'm already planning on F80 LCA come spring!
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      02-14-2015, 11:22 PM   #17
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Very interested... thanks for all your T&E, and for sharing here!
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      02-15-2015, 01:25 PM   #18
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Have you guys installed this on a vehicle that also had the camber pivot bearing replaced that also added -0.5 degrees of camber. Curious as to how that kind of set up with a camber of ~ -1.6 to -1.8 degrees of these cars.
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      02-15-2015, 03:35 PM   #19
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Martin,

The F2x Mx35i has the -0.5 camber pivot bearing fitted as standard hence I think why Harold @ HPA is putting a caveat on his webpage saying not suitable for M235i as he's not tried this upgrade on one yet.

It reads like once Harold gets an opportunity to mount upgraded LCA (and hopefully the matching TS too) on an M235i he will update suitability for cars with -0.5 dialled in already.

BP
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      02-17-2015, 01:36 PM   #20
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Quote:
Originally Posted by Bee Pee View Post
Martin,

The F2x Mx35i has the -0.5 camber pivot bearing fitted as standard hence I think why Harold @ HPA is putting a caveat on his webpage saying not suitable for M235i as he's not tried this upgrade on one yet.

It reads like once Harold gets an opportunity to mount upgraded LCA (and hopefully the matching TS too) on an M235i he will update suitability for cars with -0.5 dialled in already.

BP
It will likely work, but I would rather confirm it than not.
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      02-17-2015, 10:29 PM   #21
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Quote:
Originally Posted by HP Autosport View Post
It will likely work, but I would rather confirm it than not.
Quote:
Originally Posted by Bee Pee View Post
...Installing mis-match lower suspension parts (longer f8x m3/4 LCA and stock TS) must effect castor and steering.
This was my concern as well... Harold, can you confirm that everything else (other than camber) can be aligned into spec with the F8x LCA and stock TS?

Also, if they will in fact work with the F30 with swivel bearings (the OE hubs/carriers that add 0.5 of negative camber)?

Thanks again, Harold.
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      02-18-2015, 12:48 PM   #22
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Quote:
Originally Posted by DVC View Post
This was my concern as well... Harold, can you confirm that everything else (other than camber) can be aligned into spec with the F8x LCA and stock TS?

Also, if they will in fact work with the F30 with swivel bearings (the OE hubs/carriers that add 0.5 of negative camber)?

Thanks again, Harold.
Camber would be the only setting changed here. All other settings were within factory specs and the car drives great with more eagerness to turn-in. My customer is hoping to have reduced outer shoulder wear on his tires, which the additional -0.5 of camber should help as well.
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