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Another Castle Combe trackday vid, tyre comparison

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TomK
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Another Castle Combe trackday vid, tyre comparison

Post by TomK » Fri Nov 10, 2017 11:51 am

bradz wrote: Fri Nov 10, 2017 11:15 am I have a friend with a hunter alignment system,
That's the kind of friend I'd love :lol:
bradz wrote: Fri Nov 10, 2017 11:15 am We have tried various setups, I'm currently running the CSL setup with as much neg camber as the car would allow on stock top mounts - This was with 225's up front and 255's on the rear, and on stock suspension.

I have KW V3's on order & M3 ARB kit so hopefully that will help matters, May need to get some top mounts...
Having suffered the same as you and having driven and followed Fishy Dave's car (stock tyre setup) round track I decided to follow his geo direction and introduced a small amount of toe out at the rear (around 1deg iirc). Less than Dave cause shall we say he's more 'comfortable' with oversteer (aka lunatic :D ) but it really really helps the car to turn in and also stop it pushing on so much in higher speed stuff, it does induce some oversteer tendencies though. The camber on the rear is set at stock so -ve1.5deg, I tried going up to 2 1/4 and it made the car rather dangerous so I wouldn't advise altering that. Tyre wear seems fairly even now. At the front I increased the camber over stock by shimming the strut out, I think it was 2mm that gave me another degree so it's at around 2 1/2 now. Outside edge tyre wear is much improved, it was hurting the edge badly before. Adjustable plates would be a good idea of course if you're doing a few road miles as well.
Enjoy the Kw's, they should be great! Personally I haven't felt the need to fiddle with the arbs, but some adjustable ones would be nice :whistle:
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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bradz
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Another Castle Combe trackday vid, tyre comparison

Post by bradz » Fri Nov 10, 2017 1:47 pm

I was picking Daves brains at the Ace cafe meet about his setup...

We haven't really messed about with the toe much, Thanks I'll give it a go, I too am running 1.5 of negative camber on the rear seamed to help, I have just purchased some power-flex arms, I can't believe how flimsy the stock items look!

I'm currently doing a rear end refurb so I thought while its apart I would do everything at once! From Brake lines to a diff rebuild! A few people on here have fitted the M3 bars so I thought lets get it done, I have a few friends in the trade so I get it all at trade price!

I have had KW's on previous cars and rated them highly.
Z4M Coupe, E92 M3, E46 M3 Track car :driving:

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Beedub
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Another Castle Combe trackday vid, tyre comparison

Post by Beedub » Fri Nov 10, 2017 4:12 pm

bradz wrote: Fri Nov 10, 2017 1:47 pm I was picking Daves brains at the Ace cafe meet about his setup...

We haven't really messed about with the toe much, Thanks I'll give it a go, I too am running 1.5 of negative camber on the rear seamed to help, I have just purchased some power-flex arms, I can't believe how flimsy the stock items look!

I'm currently doing a rear end refurb so I thought while its apart I would do everything at once! From Brake lines to a diff rebuild! A few people on here have fitted the M3 bars so I thought lets get it done, I have a few friends in the trade so I get it all at trade price!

I have had KW's on previous cars and rated them highly.

i have the kw club sport and they are nothing short of brilliant, the change to the car was as big as any of my other changes.
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BMWZ4MC
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Another Castle Combe trackday vid, tyre comparison

Post by BMWZ4MC » Wed Nov 15, 2017 11:14 pm

bradz wrote: Fri Nov 10, 2017 11:15 am I have a friend with a hunter alignment system,

We have tried various setups, I'm currently running the CSL setup with as much neg camber as the car would allow on stock top mounts - This was with 225's up front and 255's on the rear, and on stock suspension.

I have KW V3's on order & M3 ARB kit so hopefully that will help matters, May need to get some top mounts...
I fiddled with the stock suspension and geo for ages but couldn’t get rid of the understeer. Decent tyres helped more than anything else (including pulling the camber pins and fitting a strut brace).
In the end, I followed Beedub’s advice and bought KW Clubsports with adjustable camber plates. I also fitted stiffer ARBs front and rear. The result abolished pitch and roll resulting in much shorter braking distances and zero understeer.

I tried various combinations of bump and rebound on my last track day and the current setup is too prone to snap oversteer so I’ll have to look up my previous suspension settings when I have time. I’d be interested to know the specifics of Tom’s and Fishy Dave’s suspension / geo setups.

Bradz, you might need adjustable drop links to get the ARBs and KWs to fit if the V3s are similar to the Clubsports. Also, I now have to use 5mm spacers with some of my wheels or they foul the uprights.
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Z4MC - heavily fettled for track use
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TomK
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Another Castle Combe trackday vid, tyre comparison

Post by TomK » Fri Nov 17, 2017 3:01 pm

BMWZ4MC wrote: Wed Nov 15, 2017 11:14 pm I’d be interested to know the specifics of Tom’s and Fishy Dave’s suspension / geo setups.
I have b12, dave is on just the eibachs, so no adjustability unfortunately for either of us.
Here's where I'm at with the geo except rear camber is now -1.5
DSC_2023.JPG
DSC_2023.JPG (145.5 KiB) Viewed 569 times
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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BMWZ4MC
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Another Castle Combe trackday vid, tyre comparison

Post by BMWZ4MC » Fri Nov 17, 2017 4:59 pm

Cheers Tom. I hadn’t realised that you don’t have an adjustable set up. Dave’s car at least (and perhaps yours too) has lots of potential yet to be released. Going from Eibachs to KWs transformed my car completely, improving all aspects of handling and braking. I now drive it into corners like I would my Westfield rather than like an understeering road car....although sometimes I come a cropper in a big way because I’ve forgetten about the inertia that comes with almost one tonne of additional weight to lug around :D
I’ve saved your picture and I’ll look at my geo to see if I can improve things further with a bit of tweaking :thumbsup:
Image
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

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Another Castle Combe trackday vid, tyre comparison

Post by Beedub » Fri Nov 17, 2017 9:03 pm

BMWZ4MC wrote: Fri Nov 17, 2017 4:59 pm Cheers Tom. I hadn’t realised that you don’t have an adjustable set up. Dave’s car at least (and perhaps yours too) has lots of potential yet to be released. Going from Eibachs to KWs transformed my car completely, improving all aspects of handling and braking. I now drive it into corners like I would my Westfield rather than like an understeering road car....although sometimes I come a cropper in a big way because I’ve forgetten about the inertia that comes with almost one tonne of additional weight to lug around :D
I’ve saved your picture and I’ll look at my geo to see if I can improve things further with a bit of tweaking :thumbsup:
i couldn't believe how much better the car braked, i really was shocked, as the car dives less al 4 tyres are really working hard, the helper springs are also very cool! :evil: :evil:
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