10-16-2018, 05:20 AM | #67 | |
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2024 G20 M340i Melbourne Red/Cognac 2019 F87 M2 Competition 6MT, LBB, slicktop, exec pkg 2007 E91 328i Silver, slushbox, Eibach fr/E93 M3 rear sway bars, ARC-8 |
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10-16-2018, 09:23 PM | #68 |
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Here is a statement from Exedy (one of the world's largest clutch manufacturer) regarding if their clutches require a break in period:
"We recommend breaking in the clutch for 1,000 km with mild engagement such as stop and go city driving prior to racing or spirited driving. EXEDY race discs usually only require a few hard slips to lap in the surfaces prior to normal driving or racing. Do not overheat the clutch during the break in period." I would say the cautious approach by most car manufacturers on to run-in a new car is mostly for the diff and the gearbox. The engine piston rings actually establish the proper wear pattern for seating (run-in) within the first 20-30 miles of street driving but the back side of the rings require maximum cylinder pressure (peak torque) to establish the proper wear pattern for seating. This means WOT during mid rev (peak torque) is the best way to achieve the best run-in and you will only need to do it for a very short period of time and should be done within the first 20-30 miles. This is a known best practice recommendation by the famous engine piston and components manufacturer JE. http://www.enginebuildermag.com/2018...the-right-way/ |
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10-17-2018, 12:28 AM | #69 |
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Autobild Sportcars measured it with this 'insoric' device at 403hp and 559nm. So slightly less then specified.
To say: I have no idea what this device is, how it works or how accurate it is. |
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10-17-2018, 07:50 AM | #70 |
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Bet you $100 that the Z4 M40i with the same exact differential[/QUOTE] Hey, question; the new Z4 has the same e-diff as the M cars? That's weird if it does; the biggest appeal of a true M car is its torque-vectoring LSD, IMO.. |
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10-17-2018, 09:52 AM | #71 |
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Hey, question; the new Z4 has the same e-diff as the M cars? That's weird if it does; the biggest appeal of a true M car is its torque-vectoring LSD, IMO..[/QUOTE] IDK, the M240i optional LSD is not the same as the one in the M2. |
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10-17-2018, 10:31 AM | #72 |
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[/QUOTE]
[/QUOTE] Yes, I just did some research; the 2019 G-series 340i & Z4 will have the same electronically controlled mechanical LSD with a 100% capable locking diff, just like any other true M car. It's different from the non-electronic mechanical 30% locking option on the current F series 340i/240i. That's surprising since historically their e-diff was reserved exclusively for M cars.. : https://www.google.com/amp/s/www.mot...ked-photo/amp/ |
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10-18-2018, 01:55 AM | #73 | |
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The appeal of the M car is the driving experience, I don't know that it's defined by anything. Honestly, based on early feedback the new Z4 will probably drive better than every M car other than the M2 maybe anyway. |
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10-18-2018, 04:41 PM | #74 | |
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10-19-2018, 04:45 PM | #75 | |
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But a convertible of that size figure 8% weight penality vs coupe of same size. Lower center of gravity though. |
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10-27-2018, 05:54 PM | #76 |
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To echo what some have said here, there is a very limited window to seat piston rings to cylinder walls in a fresh engine, that window is much longer with drivetrain components.
I have built multiple race and street engines for myself and it doesn't matter if it's a 3.4L 1500hp 2JZ-GTE, a brand new N55 powered M2, a fresh top end KTM 300XC 2-smoker, etc.. I was taught that you crank it up, verify oil pressure, check for leaks, allow to warm up to operating temperature (coolant and oil) with varying rpm, shut down, allow to completely cool, crank back up, varying rpm to operating temperature (coolant and oil), drive it like you stole it for several miles, allow complete cool down, change all lubricating fluids and change oil to one with high ZDDP for shear strength especially on turbo engines and/or flat tappet camshaft engines, rings should now be seated. Above scenario is with previously broken in drivetrain components. On brand new M2 and 2JZ M5 with brand new triple disc carbon clutch, same scenario without allowing any slipping of clutches (gradual throttle input, fully warmed R-compound tires). Manufacturers and Dealers make a shit ton of money on second hand cars with engines that were broken in by the book (very slowly). These engines eventually show excessive blow-by, oil consumption, loss of originally rated power during their life cycle because the rings never seated properly and cannot be seated properly once the narrow window of opportunity has passed. Take it for what it's worth, there is lot of misinformation out there...anyone think a race engine in a race car is driven 1200 miles for break-in at low rpm and load? Anyone know what a 500 mile NASCAR race on a fresh race engine is equivalent to in street engine/street miles...over 100K Let'r rip tater chip Strong head winds in Mexico but fairly strong for an OG: Last edited by M-Supra; 10-27-2018 at 06:06 PM.. |
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10-29-2018, 11:56 AM | #77 |
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Again - bedding brakes, clutch, diff and engine (rings carving cylinder walls) all do indeed continue to "break in" after you take delivery but as pointed out earlier - the designated procedures are more about you learning the car vs you doing irreparable harm to your vehicle by not following the procedure.
I think the main take away is that regardless of how you "break in" your new car - get that first batch of fluids out asap. I'll be replacing all drain plugs with dimple magnetic replacements. I drove mine like I stole it for the first 1173 miles but did use careful inputs and tried not to redline. I also NEVER ream on a cold car - I always wait until oil temp is up before ever venturing past 3k. Same in all of my cars. What will give you longevity is regular oil changes and proper maintenance. I will never exceed 7k mile intervals no matter what. I had an old 201 diesel with 48x,xxx miles on it - who knows how it's break in went back in 86 but It didn't get to almost half a million miles because of it. I was the reason with proper maintenance intervals. I wish people focused on regular maintenance as much as they focus on break-ins - yeesh. |
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10-29-2018, 12:41 PM | #78 | |
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These high end ladies need some good old fashioned foreplay before you ride them hard...you wouldn't try to ram it in bone dry, if you do, she'll most likely punch you right in the nutz or in your wallet |
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10-29-2018, 04:26 PM | #79 |
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Do you mean to imply that they reset or zero out the odometer before delivery?
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11-03-2018, 01:30 PM | #80 |
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So I couldn't wait till they actually came out for this model specifically, one thing that's really different is in witch way the ducts come from bottom up instead of front kidney grills to intake.
I got the car service at 1300 miles from bmw park ave. There is definitely a difference in how the car sounded before and after the service. I feel I have less pop from the exhaust now. Ass dyno feels about the same. The sound of the intake when you hear the whooshing from the turbo/ diverted valves is amazing ! |
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