08-15-2022, 11:21 PM | #23 |
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Do rear toe links and the lock out plate. The stock design has a lot of give to them when you are working the rear suspension hard. It will help or at least keep the rear a little more predictible.
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08-16-2022, 02:29 AM | #24 | |
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Anyone have a good source where to get that done? |
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08-16-2022, 06:26 AM | #25 |
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Imo, our platform suffers from understeer, not oversteer. This is why most track folks go to great lengths to fit the widest possible front tire, even downsizing the rear tire width in order to run a square setup.
What you perceive as oversteer could simply be a nasty driving habit like overslowing into a corner and then over compensating by getting on throttle too early on corner exit. I see this often and have been guilty myself. Maybe ask an instructor for a ride along for a session before you start modding any more? On the other hand, the miss matched front/rear tires compounds, springs and Swaybar could be culprit. |
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08-16-2022, 11:46 AM | #26 | |
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08-16-2022, 11:47 AM | #27 | ||||
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102y like on the proche is like the one you have… it's different, both compound and sidewall. I assure you the problem you are experiencing is the rear tire. That 102y 305 only works well on Porsche, I never liked It on my m4 on track, always weirdC always loose and tricky
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08-16-2022, 11:55 AM | #28 | |
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Picture is wrong https://m.tirerack.com/tires/Spec.js...tnum=03YR9PSC2 But it's the correct on as starting thread is 5.5/32 The 102 is ~7
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08-16-2022, 12:19 PM | #29 | |
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A) Adjustable Suspension B) Proper Tire Grip C) Aero A lot of the smaller mods you can do will generally throw balance off on the car and make it less predictable. Imo, predictability of the F8X on a track is one of the platforms shining highlights. Without making any modifications: Corner exit will be throttle control given whatever aero/mechanical grip you have available. For entry, realistically you need to brake earlier and balance the car before smoothly applying steering input. The car definitely lacks rear downforce and stock suspension has a ton of body roll. When your car is ready to accept changes your primary goal for corner entry will be more front end stiffness (springs/sway bar) + adjust rear for more rebound + more angle of attack on wing. Come join us on the track forum - tons of great info and great drivers there. |
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08-16-2022, 01:04 PM | #30 | ||
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08-16-2022, 01:07 PM | #31 | |||
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I used them both on track, grip the same, feel the same and die the same way. Tried 285f 305r to start then ended up 305 square after destroying all 4 x 285s. You will see the 285zp is as wide as the 305 98y
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08-16-2022, 03:24 PM | #32 |
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i am seeing thread width shows 11.2 for the 285 zp and 11 for the 305 98y. wow thats a surprise. What about the 315/30/19 100y from the mustangs, will it fit my 19x11 wheel? I found a used set that I'm tempted to try
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08-16-2022, 03:27 PM | #33 |
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whats your front tire width and et?
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08-16-2022, 03:31 PM | #34 | |
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Will be perfect on 11 I have Apex sm10 10"&11" wide, et 25F & 44R plus 12mmF spacers & 7.5mmR spacers Here is a pic of my car with the 285zp F and 305(98y) R
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08-17-2022, 11:53 AM | #36 |
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What improved my rear grip the most is running double staggered setup like the CS. My F82 MY20 763m wheels. 19inch 255 / 20inch 285. On MP Has springs. Tires PS4S BMW Star.
The offset with the double stag really helps the car to rotate a lot smoother and faster. |
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08-17-2022, 06:41 PM | #37 |
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Stagger in diameter is just looks. Also there may be better tire options in 19s than 20s. Your width stagger is almost same as OEM F8x so you'll understeer bit because of your front width.
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08-18-2022, 06:30 AM | #38 |
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Ok. I would work more with spring rates for balance than change the stabiliser bars. Stiffer bars makes the car more unstable over curbs and puts the car easier out of balance. The rear stabiliser bar does not have that much of effect for stability as it's mostly there to avoid droop but i still see no reason to change it.
Last edited by M 4 FUN; 08-18-2022 at 06:41 AM.. |
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08-18-2022, 10:57 PM | #39 |
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I'm not sure of the M3 dynamics but M4's when pushed hard tend to understeer. Power oversteer can be induced out of corners with too much throttle too early but steady state corning on the limit of traction, we've found they understeer more than oversteer.
On a ZCP M4 street/track setup, this provided the fastest lap times. MP HAS with camber plates, 3 degrees camber, 2mm toe out CS coded shocks, smaller CS/non ZCP front sway bar. 2 degrees rear camber 2mm toe in. ZCP/CS rear sway bar (stock), GTS coded Diff. Wheels and tyres, front 19x9.5 ET20 with star spec (GTS) 265/35 Cup2's. Rear 19x11.5 ET45 with Mustang GT350R spec 315/30 Cup2's Roll Centre is a good adjustment to balance the car and for most tracks, the rear ride height is around half an inch 13mm lower than the front. Raising the front ride and lowering the rear for example induces understeer and vice versa. Here's my M4 in street trim, a bit higher and less front camber. Last edited by RevNev; 08-19-2022 at 03:59 AM.. |
09-05-2022, 08:30 PM | #40 |
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i don't think your stock shocks are alive anymore. even if they are ok this car's stock suspension can't cope in demanding situations. maybe it is time to upgrade for a proper coilover setup and shape the things around it. preferably with something you can setup low/high speed compression and then you have lots of option to play caster,camber,different spring rates.
I am amazed how many f8x owners simply skip the weakest point of the car and try to fix the problem with lots tapes |
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09-06-2022, 01:43 AM | #41 | |
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09-06-2022, 06:15 PM | #42 |
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you don't need that button. whichever car i have used with these EDC system (including my current kw ddc - which will be swapped soon ) it felt like only good mode is sport. comfort is bouncy and sport plus rebound too stiff, compression too soft. so always I ended up using sport no matter which condition, car and suspension. (bmws,porsche,mercs) if you set stiffer low speed and mid stif high speed. Problem about sway bars, monoballs and rear toe/tractions arms is that you just start to throw random stiffness to the places and I personally could not find a balance and took them off. in one setup i achieved great rear traction however it felt like when it goes out of control, it will go off properly. Then I decided not to throw random stuff and invest in proper coilovers. |
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09-06-2022, 08:05 PM | #43 | |
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09-07-2022, 11:20 AM | #44 |
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