04-21-2022, 05:43 PM | #1 |
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Continental ExtremeContact Force tire reports?
Wondering if anyone is running and can report on these new Continental ExtremeContact Forces?
Thinking about this tire or the Hankook RS4 for HPDE. Currently on Michelin PS4. Thanks, Matt
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2015 228i w/track package, MCS 2 way NonRemote Dampers, new bmw long block, VRSF catless downpipe, AR Mtrsports oil pan baffle, Ground Control camber plates, Apex ARC-8 18 x8.5 wheels, ET45 with 5mm spacer in front only, Schroth Quick Fit Pro harnesses
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05-05-2022, 11:18 AM | #3 |
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I'm running PS4s on the front R888R on the rear, I love the setup hooks great,
I used to run all 4 PS4 on my f30, would recommend as well if you don't care as much about launch times
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05-05-2022, 11:30 AM | #4 |
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First off my comments are in context of a fairly new car driver in the intermediate group.
The PS4s were very good especially in wet or cold track conditions. They talk to you when they approach the limits so thats good. My 228i had quite a bit of body roll before I got my new MCS suspension and the tire would roll over on sharp turns quite a bit so the edge and shoulder wore a lot. They were down to the cords on the edges so they got replaced with Falken RT660s & new Apex wheels
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2015 228i w/track package, MCS 2 way NonRemote Dampers, new bmw long block, VRSF catless downpipe, AR Mtrsports oil pan baffle, Ground Control camber plates, Apex ARC-8 18 x8.5 wheels, ET45 with 5mm spacer in front only, Schroth Quick Fit Pro harnesses
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05-14-2022, 11:41 AM | #5 |
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I just replaced my Hankook RS4's with another set of RS4's.
They've gone up in price, and I seriously thought about a set of Falken RT660 instead, which were ~$100 cheaper for the set. But, the RS4 is still the gold standard for HPDE tires. Mainly because they last a long time. I got 8 solid big track HPDE weekends from them, over 3 years, and a few thousand street miles. Still had plenty of tread for HPDE, but they had gotten hard from winter storage and heat cycling, and just didn't brake well anymore. The RS4 is also known to be very consistent lap to lap, and my experience bore that out. They are bulletproof. The RT660 gets really good reviews, and is the faster tire. But with a heavy F22 I was thinking I would only get a year from them, making the RS4 the better value. And as an intermediate HPDE driver, consistency and cheap long life is way more important to me than ultimate lap times. Oh, and I also just replaced the OEM PSS with PS4S, but those are for street only. They just won't last on the track. (And boy was that an expensive day at the tire shop....) |
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05-14-2022, 02:36 PM | #6 | |
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2015 228i w/track package, MCS 2 way NonRemote Dampers, new bmw long block, VRSF catless downpipe, AR Mtrsports oil pan baffle, Ground Control camber plates, Apex ARC-8 18 x8.5 wheels, ET45 with 5mm spacer in front only, Schroth Quick Fit Pro harnesses
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05-17-2022, 05:34 PM | #8 | |
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Are you saying that the Falken RT660 is not a street tire and if so why is it more difficult to learn on? Are you recommending a non-performance tire and if so how are you defining that? And why? Thanks for your comments!
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2015 228i w/track package, MCS 2 way NonRemote Dampers, new bmw long block, VRSF catless downpipe, AR Mtrsports oil pan baffle, Ground Control camber plates, Apex ARC-8 18 x8.5 wheels, ET45 with 5mm spacer in front only, Schroth Quick Fit Pro harnesses
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05-17-2022, 06:30 PM | #9 | |
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05-18-2022, 01:19 AM | #10 | |
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2015 228i w/track package, MCS 2 way NonRemote Dampers, new bmw long block, VRSF catless downpipe, AR Mtrsports oil pan baffle, Ground Control camber plates, Apex ARC-8 18 x8.5 wheels, ET45 with 5mm spacer in front only, Schroth Quick Fit Pro harnesses
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05-18-2022, 08:13 PM | #11 | |
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The 225 is also CHEAPER (notice a theme?) than the 245, and the narrower rims were less too. And, smaller/narrower means LIGHTER, and that's always good. (Also why I run 17".) If you don't go for a wide super-sticky version, I would also argue that an endurance/HPDE oriented tire like the RS4 is better to learn on than a street tire. First, they have a much stiffer sidewall. This makes them more predictable, and better steering than even a high performance tire like a PS4S on the track. And an endurance tire will be way more consistent than a street tire, with less 'greasiness' as they heat up. Your point about auto-x or time trial oriented tires, like the (no longer available) Bridgestone RE71 is valid. They can have a lot variability as they heat up. But not all 'track' tires are like that. Also a street tire will wear incredibly fast, to the point you could eat a set up in a weekend. Especially with newbie understeer/scrubbing. Keeping costs down means more money for track time, which will lead to more and faster learning. I figure my RS4 are lasting at least 4-5x what a street tire would, and that's easily the price of 2-3 track weekends. Another reason I originally went narrow was to keep the car in the 'F Street' class for auto-x. Ended up not doing much auto-x, but all the other reasons made the 225 RS4 the best choice for me. Last edited by ggggbmw; 05-18-2022 at 08:20 PM.. |
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05-19-2022, 07:34 AM | #12 | |
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This is an excellent approach as well, and you make a good point about the benefits of a track-designed carcass and better lifespan. And with extra bonus points for totally bucking the 'bigger is better' BS and going lighter. |
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05-19-2022, 09:45 AM | #13 |
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Although in general the wider tyre will give more grip, ther may also be other changes needed to actually optimise that grip and keep the most tread in contact with the tarmac. If a different tyre compound and carcass construction is available in a narrower size, it may have as much if not more grip.
As an example, I have run 3 different tyres and two different camber angles on the rear of my Caterham on the track. 195/50-15 RE-71R, 180/530-13 Pirelli slick (equivalent to a 235 wide road tyre) and 235/45-13 AR-1. All tyres have been run at 1.5 degrees rear camber, The AR-1 is currently on and has been changed to 2.7 degrees rear camber. To get the optimum grip based on maximum tread contact with each tyre, optimum sidewall roll and tread temperature and bearing in mind each rear wheel has approximately 175kg (390 lbs) of load on them, At 1.5 degrees of camber and cold tyres: 195/15-15: 1.25 bar (18PSI) 180/530-13: 1.10 bar (16PSI) - stiff sidewall and moderate tread flexibility 235/45-13: 1.00 bar (14.5PSI) - soft sidewalls but more rigid tread When I increased camber to 2.7 degrees the 235/45-13 tyre needed 0.90 bar (13.5 PSI) to keep the optimum tread contact, which equates to about 1.30 bar (19PSI) when hot, a pressure I wouldn't want to drop below to avoid popping the bead off the rim. Bottom line is you may need more camber and a different tyre pressure to optimise use of a wider tyre. |
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06-10-2022, 07:45 PM | #14 | |
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Not sure what other summer tire options may provide for a stiffer sidewall...suggestions???
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06-11-2022, 11:47 PM | #15 | |
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with the M3/4 LCAs you can get -1.8 neg camber which will help a lot.... but the MPSS or PS4s sidewalls are made of cheese... either the RE-71r which i believe is not being made anymore or the RS4s have much stiffer sidewalls and combined with the LCAs will have no shoulder issues.... I would go with the RS4s having used both.... they just last a lot more than the RE-71r |
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06-19-2022, 03:04 PM | #16 | |
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I just got a set of the PS4S for street tires. They are definitely firmer than the * MPSS, with really nice initial turn-in and grip for things like fast lane changes. But they are just as quiet and refined as the old * MPSS for everything else. I use Hankook RS4 as my track tire, mainly because they are bullet proof. But, I hate using them on the street. They are LOUD. That is an issue with all of the 200TW track oriented tires. None of them will be as quiet as the 300TW tires like the PS4S or Conti Extreme. That may not be important to you, but it is to me. The best thing about this car is that it's a comfy luxury coupe around town, and if the tires are howling that really detracts from the 'luxury' vibe. |
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