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03-18-2014, 03:56 PM | #23 |
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What is everyone running for rear camber arms? I thought that the stock rear arms can only dial in -1 camber at the most? Is that correct?
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03-18-2014, 03:57 PM | #24 |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] E85 Z4 M (Retired) [9.41] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.56] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
I'm as almost -3 rear with stock arms (car is lowered).
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03-19-2014, 09:16 AM | #25 |
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I'm at -2.5 with stock arms and Eibach springs.
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03-21-2014, 08:53 AM | #27 |
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have you had any track time on this yet?
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03-21-2014, 10:42 AM | #28 |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] E85 Z4 M (Retired) [9.41] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.56] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
Heading down tomorrow morning! =D
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03-21-2014, 11:02 AM | #29 |
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03-21-2014, 11:50 AM | #30 |
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Thanks guys. Do we have camber adjustment in the front as well on stock suspension?
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03-21-2014, 12:43 PM | #31 | |
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You can pull the pins on the tower to allow some adjustment at the 3 tower nuts.
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03-22-2014, 05:15 PM | #32 |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] E85 Z4 M (Retired) [9.41] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.56] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
Finished first day, car feels good but it's my first time driving on R-comps so it takes some getting used to. I definitely want to dial in more camber up front, I feel some 'resistance' on some of the faster turns. Luckily the tires grippy enough to get me through but it doesn't feel as precise. Here's how she looks with new 17" Apex
9" front et42, 9" rear et30, 255/40 R888's square |
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03-23-2014, 08:54 PM | #33 |
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Good stuff!
Car looks very different with more camber in the back.
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04-20-2014, 03:50 PM | #34 |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] E85 Z4 M (Retired) [9.41] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.56] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
Just came back from 2nd event which was at Summit Point. Compared to NJMP, despite having a longer straight, the track is slower because of the tighter turns. My new alignment is -2.8* and 1/16 toe out in front, -3.0* and 1/8 toe in on rear (just added a tad bit more negative camber up front).
Turn in and mid-corner felt great but car was squirming under heavy braking. Also noticed the front end feels really light, think my left tire was catching air on some of the uphill turns. I actually like the soft spring rates I'm running now so I'm going to start with a stiffer front sway to see if that'll help. Oh yea 255 R888's square... Totally ate through my front liner by the bumper attachment area lol. Stiffer springs might help a little bit with that. Last edited by 3002 tii; 04-21-2014 at 08:35 PM.. |
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04-20-2014, 06:11 PM | #35 |
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Tires making some clearance
To combat the wheel life you're going to have to adjust your rebound in the rear for the shocks) if you can do that, increase spring rate, or bar. It looks like you took option 3. The squirming can be contributed towards not enough toe. |
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04-21-2014, 03:14 AM | #36 | |
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Likewise, the static geometry settings on a car are a "best guess" compromise to account for the movement of the chassis relative to the wheels which will occur in the dynamic situation. If you can contain the movement of the chassis better by using springs of the correct stiffness, you won't need to run so much camber either and your car will handle so much better. Increasing the stiffness of the ARBs will only reduce lateral body roll and will have no effect on the pitching and lifting you describe. |
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04-21-2014, 09:23 AM | #37 | |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] E85 Z4 M (Retired) [9.41] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.56] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
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Can you explain why a stiffer ARB wouldn't effectively stiffen up the springs and help alleviate the issues I described? |
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04-21-2014, 12:38 PM | #38 | |
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You'll find that stiffer springs and dampers at the front of the Z4MC will better prevent the pitching and lifting as well as help to reduce lateral bodyroll. |
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04-21-2014, 12:45 PM | #39 | |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] E85 Z4 M (Retired) [9.41] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.56] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
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04-21-2014, 01:07 PM | #40 | |
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EDIT I've just revisited the beginning of this thread and I see that you had the car corner weighted. I really can't see how "static" corner weighting can work when in the dynamic situation it promotes aerodynamic lift, which alters the dynamic corner weights. If the front of the car is getting "light" during acceleration, then the ride height adjustments which produced the perfect static corner weighting are blown out of the window when the car is driven! Last edited by exdos; 04-21-2014 at 01:31 PM.. |
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04-21-2014, 08:04 PM | #41 | |
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04-21-2014, 08:37 PM | #43 |
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Garage List E86 Z4 M [10.00]
F15 X5 xDrive35i [9.17] F10 550i (Retired) [9.17] E85 Z4 M (Retired) [9.41] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.56] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [8.93] |
I spent the better half of the day reading some threads on BFC's racing section as well some other forums and it seems like wheel lifting isn't unusual and shouldn't be a major concern unless it affects overall handling.
I know I'm coming off a little scatterbrained in trying to summarize my observations but if I had to sum it up concisely, my primary issue is that at times the front end would compress so much that it almost wouldn't recover fast enough for the next turn. However I can't tell if this is an alignment issue or running tires that are too sticky relative to soft springs. |
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04-22-2014, 05:42 AM | #44 | |
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In the case of 3002 tii's car, how come it appears to have zero rake after corner weighting when OEM has some positive rake? |
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