STANG KILLA SS goes "racin"
03-05-2019, 01:27 PM
#261
I dont read any manufacture hype. but i cant say ive ever heard anyone else talk about this tire like you are. but my finding do match your statement. unless the cold was at fault.
but im not super worried about the tires. i can fix those by going back. just and expensive experiement.
but the brakes have me baffled. very odd symptoms.
but im not super worried about the tires. i can fix those by going back. just and expensive experiement.
but the brakes have me baffled. very odd symptoms.
03-05-2019, 01:31 PM
#262
03-05-2019, 06:31 PM
#263
A refresher on ice mode: pitch car hard into corner; all 4 wheels rotating at different speeds. Pressing the brake while wheels all rotating at different speed (or one gets to lockup too fast), maybe at high rpm (not sure what all inputs are actually taken into consideration), ABS computer decides you are on ice, does not know what to do, and so it closes off the input lines to the ABS unit, and you get about 25% braking ability. Literally the unit closes the hydraulic input lines, the pedal feels hard as a rock because you can not actually push fluid anywhere. You'll just blow your MC seals the harder you press. The only solutions are
That you said your bad brake issue was at high RPM is familiar. I tried to track down what I thought was vacuum leaks for years (with vac canisters, pumps, checkvalves) to no avail until I came to the realization ice mode was real and I have it worst when I was throwing the car hard into corners and hoping ABS would help stop me; but in fact it worked against me. (Wasn't that how ABS was sold to the public? Anyways...) Driving smoother helps reduce the likelihood of ice mode. I have had it far less now from adjusting my too-agressive style to be smoother yet keep momentum in turns.
A quick google search shows CorvetteForum posts describing it (unclear exactly what car years). Cold tires with less grip certainly also increase brake distance compared to your old setup. I hope this helps.
- Quickly let off the brake and get back on it, hopefully in this 1/2 second you are a little slower and straighter
- Adjust your line to go to the runoff area if safe
- Plan ahead and always do more braking in straight line, don't trail brake, or don't do it when you are heading into a high pucker factor corner, or not so abruptly
- Accept that if ice mode strikes, you're comfortable blowing your AX run or lap, as bringing the car home in 1 piece is more important than this run/lap so you mitigate the outcome and stay cool.
- Also watch for bumps/ripples partway through corners that could upset the car or let a wheel get light and lockup too fast
That you said your bad brake issue was at high RPM is familiar. I tried to track down what I thought was vacuum leaks for years (with vac canisters, pumps, checkvalves) to no avail until I came to the realization ice mode was real and I have it worst when I was throwing the car hard into corners and hoping ABS would help stop me; but in fact it worked against me. (Wasn't that how ABS was sold to the public? Anyways...) Driving smoother helps reduce the likelihood of ice mode. I have had it far less now from adjusting my too-agressive style to be smoother yet keep momentum in turns.
A quick google search shows CorvetteForum posts describing it (unclear exactly what car years). Cold tires with less grip certainly also increase brake distance compared to your old setup. I hope this helps.
03-06-2019, 09:20 AM
#265
and yes ive never seen anyone run a R888 on track. seen plenty of high level trackers running the R888R.
either way doesnt matter. ive already got a set of Rivals ordered.
the brake pedal push back is the one im trying to solve.
03-06-2019, 03:12 PM
#266
the R888 is a totally different old tire than the R888R that im running.
and yes ive never seen anyone run a R888 on track. seen plenty of high level trackers running the R888R.
either way doesnt matter. ive already got a set of Rivals ordered.
the brake pedal push back is the one im trying to solve.
and yes ive never seen anyone run a R888 on track. seen plenty of high level trackers running the R888R.
either way doesnt matter. ive already got a set of Rivals ordered.
the brake pedal push back is the one im trying to solve.
03-07-2019, 07:35 AM
#267
A refresher on ice mode: pitch car hard into corner; all 4 wheels rotating at different speeds. Pressing the brake while wheels all rotating at different speed (or one gets to lockup too fast), maybe at high rpm (not sure what all inputs are actually taken into consideration), ABS computer decides you are on ice, does not know what to do, and so it closes off the input lines to the ABS unit, and you get about 25% braking ability. Literally the unit closes the hydraulic input lines, the pedal feels hard as a rock because you can not actually push fluid anywhere. You'll just blow your MC seals the harder you press. The only solutions are
That you said your bad brake issue was at high RPM is familiar. I tried to track down what I thought was vacuum leaks for years (with vac canisters, pumps, checkvalves) to no avail until I came to the realization ice mode was real and I have it worst when I was throwing the car hard into corners and hoping ABS would help stop me; but in fact it worked against me. (Wasn't that how ABS was sold to the public? Anyways...) Driving smoother helps reduce the likelihood of ice mode. I have had it far less now from adjusting my too-agressive style to be smoother yet keep momentum in turns.
A quick google search shows CorvetteForum posts describing it (unclear exactly what car years). Cold tires with less grip certainly also increase brake distance compared to your old setup. I hope this helps.
- Quickly let off the brake and get back on it, hopefully in this 1/2 second you are a little slower and straighter
- Adjust your line to go to the runoff area if safe
- Plan ahead and always do more braking in straight line, don't trail brake, or don't do it when you are heading into a high pucker factor corner, or not so abruptly
- Accept that if ice mode strikes, you're comfortable blowing your AX run or lap, as bringing the car home in 1 piece is more important than this run/lap so you mitigate the outcome and stay cool.
- Also watch for bumps/ripples partway through corners that could upset the car or let a wheel get light and lockup too fast
That you said your bad brake issue was at high RPM is familiar. I tried to track down what I thought was vacuum leaks for years (with vac canisters, pumps, checkvalves) to no avail until I came to the realization ice mode was real and I have it worst when I was throwing the car hard into corners and hoping ABS would help stop me; but in fact it worked against me. (Wasn't that how ABS was sold to the public? Anyways...) Driving smoother helps reduce the likelihood of ice mode. I have had it far less now from adjusting my too-agressive style to be smoother yet keep momentum in turns.
A quick google search shows CorvetteForum posts describing it (unclear exactly what car years). Cold tires with less grip certainly also increase brake distance compared to your old setup. I hope this helps.
03-07-2019, 08:39 PM
#268
We have some folks testing the Falken Azenis RT615K against the Toyo RR tires we're mandated to run. Apparently the 615 was faster on the initial test, so we'll see how the rest of this goes with summer heat around the corner and more cycles on them.
If you plan to cage this thing and go wheel to wheel you're going to want spherical bearings, coilovers, and 2 piece brake rotors at least up front. I can't imagine running ST1 or STU with no aero.
If you plan to cage this thing and go wheel to wheel you're going to want spherical bearings, coilovers, and 2 piece brake rotors at least up front. I can't imagine running ST1 or STU with no aero.
03-08-2019, 12:38 PM
#270
03-08-2019, 06:18 PM
#272
Price point is the driving factor with the 615, though I see Tirerack has them priced comparable to the RS4. I had the 615 years ago and liked the Advan Neova AD07 better. I really wish the RS4 came in 295/40/17 for my Z06. I'm sure 285/35/18 will be good enough though. Just get A7s Stang Killa.
03-14-2019, 11:02 AM
#276
For a car that still sees normal street use, I think ABS is worthwhile. After my ice mode woes and investigation, I think that it's still good to keep. The ABS unit (at least talking about F-bodies, maybe corvette is a little different i'm not sure) does the dynamic proportiontion (IIRC) and if you remove it and go full manual, then you have to adjust your F/R balance, and I hear that's still not ideal. So I choose to keep the ABS and adjust my driving style, which is maybe for the better as I've had 2 FTDs in '17 (ax, with some good competitors), clearly I'm not getting slowed down wrongly by adjusting.
As for a switch to cycle the ABS on course (magicmike), that sounds like a Very Bad Idea™. And not needed, ice mode comes and goes and, again IIRC, does not permanently hinder the car while its running, ie no need to have to reset it.
As for a switch to cycle the ABS on course (magicmike), that sounds like a Very Bad Idea™. And not needed, ice mode comes and goes and, again IIRC, does not permanently hinder the car while its running, ie no need to have to reset it.
03-15-2019, 03:26 AM
#278
It's nothing to do with crappy drivers, as I've already mentioned ABS delete gives a driver an opportunity to use his skill to brake better without it. The choice lies with the driver, does he want to try to get an advantage over ABS drivers or not? Are we racing or not?