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12-05-2017, 01:38 PM | #45 | |
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12-05-2017, 02:15 PM | #46 | |
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I'm maxed around -3* front as well, you'll need to either notch your strut tower or run an offset lower control arm bushing, or, an adjustable lower control arm. You have NOWHERE near enough rear camber, and that's a big reason your car is so tail happy. I'm running -3 out back and it feels great. Do you have an LSD? Not to critique your driving, but your turn in super aggressively and it almost looks like you're initiating oversteer on purpose. Of course you'd rather have oversteer than understeer, but it just looks like you're far on the oversteer spectrum and actually need to dial in some understeer to correct.
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12-05-2017, 04:11 PM | #47 | |
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- I'm not notching the towers of a BMW track car, that's just asking for trouble. I'll likely go with afternarket arms. Need to do research since no one seems to run SPC/SPL stuff, despite both brands being quality. - Figured on the rear camber. However, until I get new wheels, or longer studs and longer spacers, I'm maxed out on inside clearance. - MFactory helical diff. The car will still understeer a lot if I don't turn in super aggressively and throttle-steer it. And oversteer is faster and more adjustable than understeer, so it results in faster lap times.
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 |
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12-05-2017, 05:52 PM | #48 |
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In regards to rear camber, what arms are y'all running? I need more than 1.6* so so so bad. It was embarrassing comparing my exit speeds with a similar power/weight m3 with more rear camber. Thanks for the tip @berns - in regards to the front I just notched mine about 3mm and am happy with -3.2 up front. Less understeer and roll over and my tires are wearing better too.
One thing that may be helping @berns crush it is his LSD, helicals are pretty suboptimal for heat, high power cars like ours and I think he's running a custom clutch plate diff if I'm not mistaken. FYI - checked times and my time was a 2:01.01 Sunday at Buttonwillow. RSRR tires 255/265 staggered 40* temps
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12-05-2017, 06:26 PM | #49 | |
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Disagree on the diff. It's a helical gear, it doesn't care about temperatures, it's not like a viscous-coupling diff. It's not as tight on lock-up as a clutch-type diff, but miles ahead of the stock e-diff. I had no problems leaving two deep, black rubbery lines around a few corners to celebrate after my 1:52 lap at Autoclub. We're all at right around the 2:00 mark around Buttonwillow with similar setups. The race is on the to see who sub-2's first.
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 |
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12-05-2017, 07:06 PM | #50 | ||
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Have you guys thought about turbo upgrades or power stuff? I've been pretty happy with the stage 2 tune, I doubt we can really use much more power with the unless we go widebody and run 285+ square since we're all on street tires.
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12-05-2017, 07:55 PM | #51 |
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Power output from the stock turbos is fine, I just I need all of it, all of the time. Going to build a second oil cooler and plumb it into my existing big single unit I build last year.
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12-06-2017, 07:15 AM | #52 | |
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12-06-2017, 11:43 AM | #53 |
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I run the BimmerWorld adjustable rear camber and toe arms. Also running the BimmerWorld precisions rear spring arm bearings, paired with AKG lower shock mounts, Power Flex Black subframe and diff bushings, and a Wavetrac LSD with the 3.46 gearing. The rear end of the car feels awesome. I'm also maxed out on rear camber though, so I'm going to see if BW can make me some shorter arms with more adjustment.
Adjustable front lower control arms would be the ticket to more neg camber without cutting anything. I'm with you, Ginger_Extract , so that's the route I plan to go. Offset bushings aren't my favorite -- adjustability is everything. As for power output, spxxx I think it's a one thing a time, kind of situation. Seems you make a lot of changes constantly, so I'd dial it in, get it solid, then play with aero, dial that in, and when you have more traction than you know what to do with, add power. But power isn't what's holding you back from a sub-2 lap at Button. We have more than 75% of dudes running sub-2, I'm sure. And for the record, the Solo Motorsports 135i Time Attack car has notched towers as well. They don't even look reinforced, and this thing is tracked HARD. It'll just be more of a last resort for me.
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Last edited by berns; 12-06-2017 at 02:48 PM.. |
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12-06-2017, 05:51 PM | #54 |
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I've seen modern BMWs and, specifically, two E90 street cars, with deformed towers. These cars were not tracked at all, either. It's not a risk I'm willing to take for an extra tenth or two of camber. YMMV.
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 |
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12-06-2017, 05:54 PM | #55 | |
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 |||| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing |||| http://www.youtube.com/user/RaceMeMZ3 |
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12-06-2017, 08:19 PM | #56 | ||
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My problem is 100% that I'm always tweaking things and rarely isolate a change for testing sake. Speed Ventures on the 16/17th at Buttonwillow?
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12-06-2017, 09:07 PM | #57 | |
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I was originally going to do 12/16 at Buttonwillow...Until my girlfriend reminded me we have a wedding to attend that weekend Looking intently at January dates. Need to get out there while the weather is ideal.
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
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12-06-2017, 09:18 PM | #58 | ||
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We'll have to plan a reach-around / rear-end grabbing 1addicts take over Buttonwillow day sometime soon. Or we can ball-out and rent Thunderhill, it's super cheap actually during the winter (think I could get pricing down to the ~$350ea) for a private day with ~10-15 peeps
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12-20-2017, 04:27 PM | #59 |
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Username of car owner: kreplator
Driver Name: Kreplator Track: Gingerman Configuration: Long Lap Time: 1:42.8 Tires: 255/35 /18 Toyo R888R Other: JB4 map 5 and e40, BMS intake, catless DP, Hawk DTC70 pads, Motul fluid, stainless lines, homemade brake ducts, TCKline Coilovers, M3 sways, Dinan camber plates -3 front / -2 rear, 3.46:1 Mfactory helical LSD, white line rear subframe bushings. |
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12-21-2017, 06:05 AM | #60 |
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Buttonwillow CW13: 1:59.51
Tires: Staggered Federal RSRR 255&265/35/18 45* temperatures MHD Stage 2 OTS Tune : don't ask KW V3 Coilover Other stuff
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12-21-2017, 06:07 AM | #61 | ||
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I installed the rear SPL arms and I'm finally breaking 2* neg camber.
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12-27-2017, 03:40 PM | #62 | ||
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Currently at -2* camber with 1/8" total toe-in out back. Stock arms, not even that low. Still need more, these Nexens need all the camber they can get for optimal performance.
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Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 |||| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17
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12-28-2017, 03:18 PM | #63 |
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Here is my fastest around Spa Francorchamp in Belgium back in May
Username of car owner: Elsabor67 Driver Name:Nick Batista Track:Spa Francorchamps, Belgium Configuration: GP course (only layout, 4.3 Miles/7.0 KM) Lap Time: 3:10 Tires: Federal RS-R 255/35-R18 on Style 264 rear 18x8.5 wheels Link to video or results : The "thudding" sound was actually a slightly loose left rear wheel. After that lap I went into the paddock.
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01-13-2018, 09:29 PM | #64 |
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Hey what about Milkywave for Laguna Seca?
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01-23-2018, 03:22 AM | #65 |
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Damn that is some serious compression!!!!!!!!!
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01-23-2018, 12:23 PM | #66 | |
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