05-30-2018, 06:26 AM | #1 |
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KW for street and track
Hi
Can someone elaborate on KW V1/2/3 for daily and light trackday use? The factory suspension on my M135i is about as firm as I'd like it for the crappy Chinese roads so how to best approach an upgrade for trackdays? Maybe a set of anti-roll bars would be a good place to start? - Niels
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05-30-2018, 08:16 AM | #2 |
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If you want to retain street usability, I'd suggest getting a second set of wheels and track or semi-track tires, and track brake pads/fluid (or semi-track pads, if you plan to leave them on for the street). Anything you do to firm up the suspension will cost you street compliance, with significant handling degradation on rough roads; on track I think you will notice the tires/brakes more than a small improvement in roll control. If you go with the ultra-summer tires, you can even use them on the street, especially when it is dry out (17" wheel/tires seem to also resist punctures and sidewall damage better than the 18 or 19"ers).
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05-30-2018, 10:17 AM | #3 | |
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I have no real world experience with the V line from KW. I run their Clubsport model, but honestly I would take BC coilovers over the V line. Do the Swift spring upgrade from them and they should also come with camber plates. Just a thought.
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05-30-2018, 11:54 PM | #4 | |
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05-31-2018, 09:57 PM | #5 | |
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On the street, they are fine for my taste. Definitely a firmer ride than stock and I have to pay attention on crappy roads. But then, I'm optimizing mostly for track (monoball bushings, camber, etc), so I'm a bit more tolerant to harshness #becauseracecar. For long drives, 2-3 clicks looser on front rebound makes things a lot better. On the track, the difference is very significant. More planted and predictable than stock, especially so on tracks with many fast corners (Thunderhill West here in NorCal). There is still body roll, but by far not as much as before (I'll probably switch to stiffer springs and/or rollbars soon). As any coilovers, bump/rebound adjustability is also nice to quickly fine tune behavior trackside. I'm still learning how to properly setup, but for example, a few weeks ago my rears were rolling over too much (not enough rear camber), and dialing in a bit more front rebound helped them last 2 more track days. |
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05-31-2018, 11:51 PM | #6 |
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KW V1 is an entry-level coilover and not really track worthy, providing you with a little firmer ride but no shock adjustability. V2 is sufficient for track novices and offers rebound adjustment, so you can make the ride rather compliant or firm it up a bit for the track -- this should be good enough for most people/usage. V3 has both rebound and compression adjustments, which can be confusing and overwhelming for someone who doesn't understand how they work. V3's probably a bit overkill unless you plan on tracking quite a bit; it'll provide a bit more room for you to grow into as you get more seat time but probably not necessary. If you like tinkering, have decent track experience, and/or are serious about tracking the car a lot more, then you might want to consider Clubsports if you're set on the KW line.
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06-01-2018, 07:04 AM | #7 |
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Sound like the V2 is probably where I want to be. I have no intentions running anything stickier than the AD08R.
How have you gone about with brakes? Mine did remarkably well on factory rotors + Dixel Z front pads. One cooling lap in the middle of a 25 min session.
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06-01-2018, 10:51 AM | #8 | |
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I don't know enough about those pads to say anything about them, but the AD08R with definitely work them more. Don't forget to match your brake fluid with the tire/pad as well. Motul RBF600 should work fine. This is purely from a track perspective though. I know you have concerns about ride quality on the street too. Other than brake pads I daily drive my track setup
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06-01-2018, 05:25 PM | #9 |
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From my trackday. Unfortunately my Gopro went bust so only have this video:
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06-01-2018, 05:28 PM | #10 | ||
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06-02-2018, 10:12 AM | #11 | |
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06-02-2018, 10:29 AM | #12 | |
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I've been tracking a long time, but here is one from my first Bimmer Challenge Time Attack.
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06-04-2018, 03:45 PM | #13 | |
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Amazing what a couple of clicks does to the ride quality, hey? I went 2 clicks softer om my HS comp, and 1 click with the LS comp and it felt like I was on Dinan springs again (under damped, lol). Found that doing 1 click at a time works best for dialing in.
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06-05-2018, 12:33 AM | #14 | |
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I learned that the hard way! First track day with the V3 my rear outside was wearing the outside edge too much, so I thought I was just driving it too hard and should just compensate with tightening the opposite corner a little. My "little" was 3 clicks. Only on one side. I spun immediately on the first hard left-hander of the warmup lap right after Later found out I must have hit a berm or a pothole too hard because the toe on that wheel was just way off... |
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06-06-2018, 02:13 PM | #15 | |
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And yea, I could definitely see the car spinning out with 3 clicks higher on one side, lol. I have about three clicks in total between what I feel will be a good "track" setting, and street. There's 6 clicks each way from neutral, so 12 total clicks of adjustment (iirc). Can't imagine these things cranked tight, car would want to fish tail badly I'm sure. I use only one click down of rebound damping adjustment to get my reasonable street setting, from KW's recommended track setting. D
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