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05-01-2024, 08:44 AM | #23827 | |
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Below is a picture showing a fastener being preloaded + an applied load that puts the fastener far past its yield strength and when unloaded it has a slope almost identical to the pre-yield stiffness/slope. However, each time it is re-preloaded, you start to get more displacement/strain until it reaches its ultimate strength and ruptures. The engineering stress-strain (or load-disp) curve shows the stress reducing with increased strain/disp because engineering stress always references the original unstressed cross-sectional area; however, if true stress-strain are used then you see the stress continually increasing until reaching the ultimate strength. This is because true stress is calculated using the instantaneous cross-sectional area which is decreasing with increasing load beyond the yield strength. The calculations that I’ve performed on the 5-bolt wheel-to-hub bolt pattern shows approximately 10% of the applied lateral bending load is carried by the bolt/stud as an increased axial load (total axial load = applied load*% of applied load carried by studs/bolts + preload + thermally-induced load). It also, conservatively, shows the preload of grade 12.9 (and even 10.9) has sufficient preload from all five bolts/studs is sufficient to prevent the wheel from rotating on the hub (i.e., a lateral load + local bending due to shear are not carried by the studs/bolts). If the joint had gapped than the stud/bolt has to carry almost 100% of the applied axial load + shear load + bending moment due to shear and wheel applied torque.. Last edited by M3SQRD; 05-01-2024 at 03:17 PM.. |
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CamasM3e933482.50 RalliartRsX21.00 |
05-01-2024, 08:53 AM | #23828 |
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jritt@essex post is broadly applicable for track use.
I like Motul RBF660 for the price but plenty of people use RBF600 as well. Usually one of the cheapest brake fluids with a high dry boiling point.
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05-01-2024, 09:26 AM | #23829 | |
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05-01-2024, 03:36 PM | #23830 |
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Do any of you guys run an oil catch can? I noticed my plenum inlet had a bit of oil in it. As I track my car I’d like to ensure this isn’t an issue.
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05-03-2024, 08:30 PM | #23832 |
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It's been a few years since I've been on track but I recently purchased an e90 m3 and I'd like to get back out. The car is an 08, has had rod bearings/TAs done (as well as a bunch of other stuff - oil filter gasket, oil separators, iacv and lines, valve covers, vanos covers, more). It has 108k miles.
Something to be cautious of or full send? I'm tentatively signed up for a day on May 24. |
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omgzirra_exe1649.50 1FastSicilian558.50 |
05-04-2024, 12:35 AM | #23833 | |
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But other items specific to the e9x m3? Full send, Happily tracking mine at 135k. The only thing that has come up in 8 sessions was the cowbell noise. Mine resolved after replacing the giubo. |
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05-04-2024, 09:37 AM | #23834 | |
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05-04-2024, 11:08 AM | #23835 | |
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On a serious note, just make sure you have the proper brake fluid and pads.. Street bads and oem fluid can be a recipe for disaster on track.
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05-04-2024, 12:17 PM | #23836 | |
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Definitely agree with starting with fresh fluids/oils everywhere for a car with > 100k miles. Track pads + high-temp brake fluid is needed for track use. |
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05-04-2024, 02:22 PM | #23837 | |
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Glad to hear people have been having success at higher mileage. I know that’s sort of known acceptable on s54 cars, I wasn’t sure about these. |
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05-04-2024, 06:43 PM | #23838 |
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For those of you thinking about adding lightness…
AC compressor, condenser, and lines (19.66#) parcel shelf (12#) SAP (4.68#) EVAP cannister and hoses (6.7#) Windshield Washer tank (2.16# + fluid) Headlight & level sensor delete (15.18#) Heater core, AC core & dash HVAC (16.66lbs) this excludes the servos and wiring previously removed |
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05-04-2024, 10:49 PM | #23839 | |
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05-04-2024, 11:10 PM | #23841 |
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aah, i see. thanks.
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05-05-2024, 12:20 AM | #23842 |
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Rod bearings, weight balance, align
Haven't posted in a while.
I took Roast Beef Mike's advice and took my car over to Malek at MRF Engineering (949) 472-4496 Very impressed with Malek and he does great work. He is one of the few who really knows the E92 and finally a correct 4 wheel alignment with the SPL control arms with weight balance. My rod bearings weren't as bad as I thought they would be, at 56K miles. A few SPL arms had to be changed, a previous mechanic had overtightened some bolts resulting in cracks. I have not tracked the car in years, now on Pilot Sport 4S tires, 275/30/19 front and 295/30/19 rear. The car drives straight now which is nice. He also bled the brakes, had a tiny bit of air in the rear lines.
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05-06-2024, 07:26 AM | #23843 |
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Picked up a tow rig project this weekend. A '94 Chevy 3500 with a 454 swap, cammed, .30 over, and with a Holley carburetor. The poor carb tune prevented us from getting past 7 miles with it, so it had to get towed to a shop. Going to be a minute before it's tow ready, but it's got good bones. |
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05-06-2024, 10:33 AM | #23844 | |
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Current '21 DG X5MC, '22 BG G82, '11 E90 M3
Recent Past '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 I think I have an M3 problem. |
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05-06-2024, 11:29 AM | #23845 |
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05-06-2024, 12:08 PM | #23846 |
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not sure what your home setup is, but i rented a few times (towed with my X5) and it just adds too much time to the process to be worthwhile for most days for me. it was adding an hour to each end, and with a typical 530AM departure time, 8PM return I just didn't want to deal with it.
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Current '21 DG X5MC, '22 BG G82, '11 E90 M3
Recent Past '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3 I think I have an M3 problem. |
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05-06-2024, 12:59 PM | #23847 | |
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05-06-2024, 05:42 PM | #23848 |
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Just the thought of loading your trailer the night before, then driving to the track, offloading, then reloading, driving again, offloading once more, and parking the trailer just sounds like too much of a hassle for me. Thank goodness I live within a maximum of 2 hours from most tracks in SoCal.
Then I get anxiety from trailer theft these days...
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