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12-30-2019, 04:06 PM | #67 | ||
Luxury at the redline :)
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12-30-2019, 04:16 PM | #68 |
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What wheels?
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12-30-2019, 11:03 PM | #69 |
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12-30-2019, 11:06 PM | #70 |
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Stock, M4 comes with either 275 or 285. Further, tread width varies greatly depending on the tire of a given nominal section width, so section width is pretty meaningless.
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12-30-2019, 11:25 PM | #71 |
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Wait... but that's not what you said. You specifically replied the M4 "only can accommodate 275 max," which is patently false.
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12-31-2019, 12:01 AM | #72 | |
Luxury at the redline :)
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Ok, fine, I stand corrected.. The point was the Mustang can accommodate larger tires stock than the M4, hence the better traction. I honestly wasn't trying to take anything away from your car. My apologies; I will bow down tonight, say three Hail Marys and ask for forgiveness.. |
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12-31-2019, 01:49 AM | #73 |
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Sometimes I don't notice my tires slipping when it's finished slipping. But yeh most of the time redlining from 2nd to 3rd. And high rpms in 3rd. I gotta be careful more.
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12-31-2019, 03:53 PM | #74 |
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If you have stock power and the grippy tires this shouldn’t be an issue. My comp spins first fairly straight, second only if it’s cold. Both both gears I can stay full in and just use steering to keep it in line. These cars have a hard torque hit. My previous m3 came from snow country and on all seasons the car was hard to handle. Iv driven lots of high hp rwd cars. Proper factory tires they are not hard to handle at all imho.
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01-01-2020, 03:04 AM | #75 | |
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01-01-2020, 04:19 PM | #76 |
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I was pushing 700hp on my fox body (turbo) on 275 drag radials. I had a torque arm and panhard rod.
the F80 needs tires. wider and stickier. you should also limit boost in lower gears. the rear end seems to react very quick. maybe it's due to solid mounting? I don't really have a problem keeping the back straight launching.
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01-10-2020, 12:45 PM | #77 |
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Well in the end the fix for me (the OP) is leaving all traction control nannies on now. The car will definitely launch straight then but of course the program does intervene if wheels spin too much which is Ok . I think because the car was new to me I just liked running around with MDM mode engaged and having some fun with it. There is really no need for MDM mode on the street.
So yeah...after thinking about everything that was discussed in this thread I've just kind of changed my thought process on how this car works as well as my driving style on the street. Changed my M button settings too. Now I have to engage MDM mode separately (if I want it) which is no biggie because if you have MDM programmed to your M buttons it asks you to confirm it anyway which requires two pushes. Thanks for all the replies. It provoked a lot of thought on my part and changed the way I drive the car. Good stuff! |
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01-10-2020, 01:57 PM | #78 |
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Mine is also much squirrelly-er in MDM mode than than traction control to off. Maybe the diff. can cut power to each side and is too invasive?
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01-11-2020, 05:31 AM | #79 |
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The only thing the diff can do is lock-up the axle, it cannot "cut power" from side-to-side.
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01-12-2020, 05:56 PM | #80 |
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Thanks for the clarification. I would like to know more about how the diff. works. Looks like from pictures I have seen it has a couple "clutches" that look like a motorcycle's clutch. So, when not locked up, in a straight line, can one side slip more than another (passively) and when TC is off those "clutches tighten things up?
If anybody can point me to something on the tech the diff. uses I would appreciate it. |
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01-12-2020, 06:15 PM | #81 | ||
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Yes, it could be theoretically possible for the e-diff to be un-locked and have the DSC system individually apply the left and right rear brakes. I however doubt that is the case, since this is how a primitive/basic "active differential" works. The F8X has a diff that can actually lock-up and it is much more efficient from a dynamics stand-point to have the diff locked-up when pulling away in a straight line. IMO, why folks feel the rear to be "squirrelly" with MDM is mainly because of how the DSC system operates. When DSC detects oversteer, it will apply the front brake on the same side as the slide. Since MDM allows for some wheel spin, when the rear moves to one side, the DSC applies the front brake on that side sending the rear the other way. It applies the left and right front brakes in succession while attempting to keep the car in a straight line. With DSC fully off, the is much less side to side movement. When using full DSC ON, the DSC cuts back on the power more aggressively stopping the rear wheel spin altogether and hence the sliding around. Screenshots from the F8X technical docs:
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01-13-2020, 09:01 AM | #82 |
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This is what I *like* about my F80 to be honest. That said, it just takes some practice with modulating the throttle, and I would throw on some MPS4S rubber. Helped my tuned car some.
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01-13-2020, 09:13 PM | #83 |
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Thanks!
CanAutM3 thank you very much for the info. on the diff. Your explanation of the "squirelly-ness" in MDM vs. TC off is very logical. Never thought about the front brakes helping out in a straight line. You would think they would only be active if steering there was a certain minimum of steering angle input.
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01-16-2020, 02:05 AM | #84 |
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1st gear is super short and should not be hard for you to keep in a straight line
2nd gear is the easiest to get the wheels spinning and rear end getting loose, so its up to the driver to modulate pressure on the accelerator to allow for a shift at 7k+ rpm 3rd gear you can start to apply more pressure but still run the risk for some wheel spin and side to side action if you press your foot down too hard 4th and up and now I am assuming you are not having any problems with controlling the car |
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01-24-2020, 05:49 PM | #85 |
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I was going really fast on a curve road and there's a slight bump on the road and my car just spin along with the curve road. Dsc off too. Felt kind of nervous at times. But still got grip on the road at least.
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09-27-2021, 01:20 AM | #86 |
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Just wanted to revisit this topic.
Anyone replace their toe arms to aftermarket and diff bushings (solid or poly + turner bracket) to address these rear end issues? The above mods worked wonders for my 335i on keeping the rear end straight, but wondering if anyone who has done these mods confirm the same impact for the f8x. |
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09-27-2021, 01:54 AM | #87 |
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The E90 335i has soft subframe and diff bushings though. This car a solid mounted subframe, and diff bushing should be pretty stiff, there should be minimal flex in the rear.
However, the diff bushing on the early models is fluid-filled and prone to cracking. The later revision is poly. People who find the back-end slipping around might have a worn diff bushing? I drive my car hard and have taken it to the track, I can still keep it straight even when lighting up the rear wheels - although this wasn't the case when I first got the car on the 2015 software, it was much better when updated at the dealer to the 2020 revision. So it may be worth a SW update - or just get a coder to flash the CS/GTS software which is even better. |
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09-27-2021, 11:42 AM | #88 | |
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The only other thing I can think of is toe change on hard acceleration which is why I am going with SPL toe arms.
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