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03-07-2016, 08:52 PM | #23 | ||
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I really think about those MCS spring rates. See if you can get some more input first, but I don't think there's a reason to go so high in rates. Another thing, the M is really sensitive to rear toe settings. I'd add some rtab limiters from Turner, and go with toe-in set towards the high end of stock. (Maybe I noted before, sorry if I'm repeating myself.). More here. Integr8, me, Kgolf, my wife--all agree settings toward the "more" side of stock help a bit. http://www.zpost.com/forums/showthre...e#post14527886 If The rear is still getting loose, at that point, you could try disconnecting the rear anti-rollbar. That's another trick a few folks have tried. |
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03-07-2016, 11:02 PM | #24 | |
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Good info here...I will try to toe settings....I ended up going with 600/700....will see how it feels....I have -3.5 camber and -2.5 on rear...Do I have too much camber? |
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03-08-2016, 12:37 AM | #25 | ||
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http://www.elephantracing.com/techtopic/tiretemp.htm |
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03-09-2016, 07:32 AM | #26 | |
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I also run with no rear bar. It helped minimize the snap oversteer and smoothed things out as you get on it and work in throttle steer. & to clarify I'm running the middle configuration from MCS (100 lbs differential) I'm VERY happy with this setup.
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03-09-2016, 01:57 PM | #27 | |
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how were you tires after? I ended up going with 600/700 =) if i dont like it, ill just orer 750 for rear later. But I went with eibach cuz price was cheap....are they all same thing? Or hyperco is better than eibach? Cant see springs doing a major difference between brands |
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03-09-2016, 02:32 PM | #28 |
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Like others have said your way too loose for such stiff springs in the rear. These guys that are running without sways in the rear have actually figure that out.
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03-09-2016, 03:15 PM | #29 | |
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Tire wear was not a problem for me. IMO hyperco and swift are worth the cost. (Tons of info on the web) Also Hyperco has a 5.5" spring for the rear which I feel is the ideal length.
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03-10-2016, 03:28 PM | #30 |
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And here I am thinking the 500/600 GC setup I've had for the past 5 years is too aggressive...
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03-11-2016, 12:34 PM | #31 | |
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03-21-2016, 02:57 PM | #32 |
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So I went to Chuckwalla this past weekend with 600/700 springs. Car felt much much better. Since it was the first time at this track, I was a little bit lost on braking point, so I was lifting a lot the throttle in middle of the turn causing the car to oversteer. Also this track is in the middle of the desert, so everybody was having hard time getting grip since a lot of sand on the track
Most of the oversteer were from my mistakes this time. I noticed that I have to run very soft compression. Anyway had fun in the bimmer challenge event!! socal people should join....good prizes! Last edited by AriuSen; 03-21-2016 at 03:05 PM.. |
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03-21-2016, 03:12 PM | #33 |
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by the way, this time i had 18x10 et 35 square with 10mm spacer on front on 275/35/18 nt01 and I have no rubbing at all!
my compression settings +4/+5 rebound +13/+14 Tried about 5 different settings, and this felt the best and fastest. Its amazing how 1 click on jrz makes so much difference |
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03-21-2016, 03:41 PM | #35 |
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my car is so planted to compared to what I'm seeing in this video.... something seems amiss imo, unless the sand really has that much effect ( I'm unsure so take your word on that).
Really good driving however , well done and the car sounds gorgeous!!
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03-21-2016, 03:55 PM | #36 |
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03-21-2016, 04:04 PM | #37 | |
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But at the end, I think figured what I have to do....my compression is still high....will lower 1 click next track....Also I didnt bother adjusting too much, because I dont know this track, so I couldnt have a base line to know whats good or bad. Also I had 1/16 toe in in the rear....will try 1/8 this time. But all my friends with e46 and s2k were complaining that it was too slippery too. thank you for your compliment |
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03-21-2016, 09:22 PM | #38 |
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Wow, looks like you were working hard on some of those corners mate.
Very well done, loving the laps. More vids required Glad you had fun out there
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03-21-2016, 09:29 PM | #39 |
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AriuSen,
Looks like you had a lot of fun--and you've definitely got loads of car control at this point! All the same, it still looks like too much rear roll stiffness compared to the front. You were getting a lot of oversteer both with power and with trailing throttle entering the turns. The second half of your video looked smoother and better balanced--either because the sand had been cleared off the track or because your throttle application was smoother. If it were me, I'd try a lower rear spring rate. Also, how are your rear suspension bushings? A sixteenth inch of static rear toe-in could turn into some toe-out if the bushings are worn and deflect a bunch. Just a thought. Keep tuning and having fun! Rick F. PS--One other thought: This was a former drift car, right? Could the previous owner have made any other changes designed to encourage a ton of oversteer? Like a very stiff rear sway bar compared to the front? Or different suspension geometry? (The latter would probably require changes to the suspension pickup points, which would be pretty obvious.) |
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03-22-2016, 07:44 AM | #40 | |
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If so then yes definitely bump it to 1/8. Did you try it w/o the rear bar? Please note, that with my settings I'm also running a wing.
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03-22-2016, 10:39 AM | #41 | |
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Yea i will try 1/8 this time....I run oem sway bars...did you mean to disconnect rear oem bar? |
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03-22-2016, 10:48 AM | #42 | |
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About the bushings, The upper arm and trailing arm are solid bushings from turner. and also have FCAB from superflex. I am starting to beleive that solid bushing in the rear is helping the car oversteer more.....even though last owner build it for drift, all he did was install that drift ebrake and he didnt even do drifting lol This saturday I am going with 1/8 toe in and also I will try a setting that will be good....if those doesnt work, I will change my spring rates again. And even then, nothing works, I will have to bring you or someone else who owns a z4m to drive my car and see if my car is normal or if the driver (me) is not driving it properly lolol. Funny how I drove an e46 after and I did 1 second faster....and that was all because I could go on gas much earlier on corner exit than my z4m. If I can just solve my corner exit oversteer, my car can be a monster! |
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03-22-2016, 11:15 AM | #43 |
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just few things to note for those interested.
I drove my z4m with nt01 and also my friends e46 m3 with same mods pretty much with re71r ok....the re71r is definetly not a street tire....its like a super r-comp....I thought that would be good for only 1 or 2 laps, but all 4 laps i did similar time. They are absolutely amazing. another thing I noticed is that, now I might know why people say m3 are better and faster than z4m......the m3 is much easier to drive fast IMO I did 1 second faster than on my car because moving from a z4m, which is harder, to a m3, took me only 2 laps to get used to it, ....HOWEVER, with the m3 I felt that I was close to the limit already. With the z4m, my car is not yet dialed perfectly and I did only 1 second slower, which made me think that if I can adjust my car to be close to the m3, the z4m is clearly faster, because I didnt even push it close to the limit yet worrying too much of the oversteer at corner exit. Last edited by AriuSen; 03-23-2016 at 12:59 AM.. |
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03-22-2016, 11:22 AM | #44 |
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Alex, did you notice any diff with the Epic tune installed? Hows the car running aside from the suspension setup? watching your vid showed your gauges turning from white to blue to red every now and then. very, very cool!
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