Can we fit hooter 255's up front?
10-07-2009, 05:50 PM
#31
Rennlist Member
I would think your approach is def smoother with less balance upset but for some reason the way I do it is just wired into me!
What setup are you going to be running? I love my 245/40-18/335/30-18 setup.. Tried the 35 sidewalk up front with 245-255 front, way too sharp and edgy with th lower sidewall, and the 335 rears I felt were unnecessary with the grip they generate, with the r888s I needed the 335s for grip!
What setup are you going to be running? I love my 245/40-18/335/30-18 setup.. Tried the 35 sidewalk up front with 245-255 front, way too sharp and edgy with th lower sidewall, and the 335 rears I felt were unnecessary with the grip they generate, with the r888s I needed the 335s for grip!
Hoosier Radial Slicks 250/650 18 front and 305/645 18 rear
OLOA Yokohama AD08 255/35 18 front 295/30 18 rear
the small rear sounds crazy until you see that it is the same tread width 11.5" as the Michelin PS2/Kumho XS 315's. I know from previous testing @ Sebring that the Yokohama is 2 secs a lap faster then PS2's. Kumho XS have good dry grip but wear quickly and are treacherous 
in the wetPeter
10-07-2009, 10:42 PM
#32
Rennlist Member
I ran the 285/30R18 A6 that is as tall as the 255/35R18 A6 (which is really a 275/30R18), combined with the 335/30R18 A6 in my 996 GT3. No ABS issues at track days, time trials or autocrosses.
The 315 and 335 Hoosiers on 18" have the same overall diameter.
At the 2009 SCCA Nationals, a good friend was running 255/315 in his stock 996 GT3, no ABS issues either.
The 255/315 Hoosiers are within the tolerance of the F/R diameters for the ABS computer. No problems at all.
The 315 and 335 Hoosiers on 18" have the same overall diameter.
At the 2009 SCCA Nationals, a good friend was running 255/315 in his stock 996 GT3, no ABS issues either.
The 255/315 Hoosiers are within the tolerance of the F/R diameters for the ABS computer. No problems at all.
I remember you ran 10s and 12s on your 6gt3. What were your offsets? Did you invert the strut or run shims?
10-08-2009, 12:28 AM
#33
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Peter,
The ABS error (big yellow light on the dashboard) is linked to running wrong diameter sizes. That's why we stay within a certain tolerance of the stock diameter (I use 4% but I believe 5% is the threshold).
I use the same braking technique you use, after several unexpected "ice mode" situation I have run into.
The ice mode is not related to the tire sizes, it is related to the tires grip and the street ABS system being calibrated for street tires. I have experienced the Ice Mode in the 996 GT3 (plenty of times), 997 GT3 RS (way too many times) and Cayman S. Interesting enough, a friend of mine got Ice Mode in the Scuderia, while I have not experienced such behavior yet with the Scuderia, indeed the Scuderia locks and flat spots the inside front tire if you're too aggressive on the brakes on corner entry.
"Ice Mode" affects Corvette, Lotus Elise/Exige, Viper, newer Porsches, way too many car. This is not linked to tire diameters, it is related to tires grip compared to stock tires.
The most annoying presence of "Ice Mode" I had was with the GT3 RS running Michelin Cup slicks (highest grip level I have driven on any tire). The car won't stop, so I needed to transfer weight to the front axle slowly, so the car would scrub speed.
There are aftermarket ABS modules ready for Racing. Some Porsche shops install the Race ABS in the street cars ($$$), but worth it.
By the way, I read the results from the UTCC, your car ran under 2:00 at VIR, very nice job. The F430 Challenge was 1 second slower than your GT2, pretty impressive considering the weight of any Porsche street GT3/GT2/GT3 RS.
The ABS error (big yellow light on the dashboard) is linked to running wrong diameter sizes. That's why we stay within a certain tolerance of the stock diameter (I use 4% but I believe 5% is the threshold).
I use the same braking technique you use, after several unexpected "ice mode" situation I have run into.
The ice mode is not related to the tire sizes, it is related to the tires grip and the street ABS system being calibrated for street tires. I have experienced the Ice Mode in the 996 GT3 (plenty of times), 997 GT3 RS (way too many times) and Cayman S. Interesting enough, a friend of mine got Ice Mode in the Scuderia, while I have not experienced such behavior yet with the Scuderia, indeed the Scuderia locks and flat spots the inside front tire if you're too aggressive on the brakes on corner entry.
"Ice Mode" affects Corvette, Lotus Elise/Exige, Viper, newer Porsches, way too many car. This is not linked to tire diameters, it is related to tires grip compared to stock tires.
The most annoying presence of "Ice Mode" I had was with the GT3 RS running Michelin Cup slicks (highest grip level I have driven on any tire). The car won't stop, so I needed to transfer weight to the front axle slowly, so the car would scrub speed.
There are aftermarket ABS modules ready for Racing. Some Porsche shops install the Race ABS in the street cars ($$$), but worth it.
By the way, I read the results from the UTCC, your car ran under 2:00 at VIR, very nice job. The F430 Challenge was 1 second slower than your GT2, pretty impressive considering the weight of any Porsche street GT3/GT2/GT3 RS.
10-08-2009, 01:17 AM
#34
Hoosier A6/R6 245/40 18 front 335/30 18 rear
Hoosier Radial Slicks 250/650 18 front and 305/645 18 rear
OLOA Yokohama AD08 255/35 18 front 295/30 18 rear the small rear sounds crazy until you see that it is the same tread width 11.5" as the Michelin PS2/Kumho XS 315's. I know from previous testing @ Sebring that the Yokohama is 2 secs a lap faster then PS2's. Kumho XS have good dry grip but wear quickly and are treacherous in the wet
Peter
Hoosier Radial Slicks 250/650 18 front and 305/645 18 rear
OLOA Yokohama AD08 255/35 18 front 295/30 18 rear
the small rear sounds crazy until you see that it is the same tread width 11.5" as the Michelin PS2/Kumho XS 315's. I know from previous testing @ Sebring that the Yokohama is 2 secs a lap faster then PS2's. Kumho XS have good dry grip but wear quickly and are treacherous in the wetPeter
Peter,
The ABS error (big yellow light on the dashboard) is linked to running wrong diameter sizes. That's why we stay within a certain tolerance of the stock diameter (I use 4% but I believe 5% is the threshold).
I use the same braking technique you use, after several unexpected "ice mode" situation I have run into.
The ice mode is not related to the tire sizes, it is related to the tires grip and the street ABS system being calibrated for street tires. I have experienced the Ice Mode in the 996 GT3 (plenty of times), 997 GT3 RS (way too many times) and Cayman S. Interesting enough, a friend of mine got Ice Mode in the Scuderia, while I have not experienced such behavior yet with the Scuderia, indeed the Scuderia locks and flat spots the inside front tire if you're too aggressive on the brakes on corner entry.
"Ice Mode" affects Corvette, Lotus Elise/Exige, Viper, newer Porsches, way too many car. This is not linked to tire diameters, it is related to tires grip compared to stock tires.
The most annoying presence of "Ice Mode" I had was with the GT3 RS running Michelin Cup slicks (highest grip level I have driven on any tire). The car won't stop, so I needed to transfer weight to the front axle slowly, so the car would scrub speed.
There are aftermarket ABS modules ready for Racing. Some Porsche shops install the Race ABS in the street cars ($$$), but worth it.
By the way, I read the results from the UTCC, your car ran under 2:00 at VIR, very nice job. The F430 Challenge was 1 second slower than your GT2, pretty impressive considering the weight of any Porsche street GT3/GT2/GT3 RS.
The ABS error (big yellow light on the dashboard) is linked to running wrong diameter sizes. That's why we stay within a certain tolerance of the stock diameter (I use 4% but I believe 5% is the threshold).
I use the same braking technique you use, after several unexpected "ice mode" situation I have run into.
The ice mode is not related to the tire sizes, it is related to the tires grip and the street ABS system being calibrated for street tires. I have experienced the Ice Mode in the 996 GT3 (plenty of times), 997 GT3 RS (way too many times) and Cayman S. Interesting enough, a friend of mine got Ice Mode in the Scuderia, while I have not experienced such behavior yet with the Scuderia, indeed the Scuderia locks and flat spots the inside front tire if you're too aggressive on the brakes on corner entry.
"Ice Mode" affects Corvette, Lotus Elise/Exige, Viper, newer Porsches, way too many car. This is not linked to tire diameters, it is related to tires grip compared to stock tires.
The most annoying presence of "Ice Mode" I had was with the GT3 RS running Michelin Cup slicks (highest grip level I have driven on any tire). The car won't stop, so I needed to transfer weight to the front axle slowly, so the car would scrub speed.
There are aftermarket ABS modules ready for Racing. Some Porsche shops install the Race ABS in the street cars ($$$), but worth it.
By the way, I read the results from the UTCC, your car ran under 2:00 at VIR, very nice job. The F430 Challenge was 1 second slower than your GT2, pretty impressive considering the weight of any Porsche street GT3/GT2/GT3 RS.
BTW Peter, Ian clocked under a 2 minute lap at VIR? WOW!!!! I was hunting for a 2 flat, I highly doubt it now LOL
10-08-2009, 11:57 AM
#35
Rennlist Member
Nice! A6's up front, why? I know they are a bit stickier then the R6's, or could be due to heating up much faster?? Better turn in??
Let me ask you Rad, you said the car wouldn't stop with Michelin slicks, why is that?? As I keep going up the line of stickier tires, I find that to be an issue as well, usually with much more grip being generated you should stop better, is it the ecu/abs electronics making that difference??
BTW Peter, Ian clocked under a 2 minute lap at VIR? WOW!!!! I was hunting for a 2 flat, I highly doubt it now LOL
Let me ask you Rad, you said the car wouldn't stop with Michelin slicks, why is that?? As I keep going up the line of stickier tires, I find that to be an issue as well, usually with much more grip being generated you should stop better, is it the ecu/abs electronics making that difference??
BTW Peter, Ian clocked under a 2 minute lap at VIR? WOW!!!! I was hunting for a 2 flat, I highly doubt it now LOL
No A6's all round for Time Trials. You only get 1 clean lap before running into traffic so no time to heat up R6's. Plus A's are faster than R's
They just don't last very long.
Peter
10-08-2009, 02:43 PM
#36
Peter I hear that, traffic out on the track sucks big time, I was able to get a 2:05 and 2:04 being the first one out, then I dropped down to like 2:10's cause of the traffic lol
he is flying man, makes me jealous wow, I love the r6's and feel they heat up fast, but also drop off fast too by the end of a session if you are really cooking,do a6's drop off or overheat easily?
he is flying man, makes me jealous wow, I love the r6's and feel they heat up fast, but also drop off fast too by the end of a session if you are really cooking,do a6's drop off or overheat easily?
10-08-2009, 03:52 PM
#37
Rennlist Member
Peter I hear that, traffic out on the track sucks big time, I was able to get a 2:05 and 2:04 being the first one out, then I dropped down to like 2:10's cause of the traffic lol
he is flying man, makes me jealous wow, I love the r6's and feel they heat up fast, but also drop off fast too by the end of a session if you are really cooking,do a6's drop off or overheat easily?
he is flying man, makes me jealous wow, I love the r6's and feel they heat up fast, but also drop off fast too by the end of a session if you are really cooking,do a6's drop off or overheat easily?
Yes A6's drop off when hot but are still faster than R6's. A lot of rear slip angle, easy to do on a GT2
, will aggravate the problem.Peter
10-08-2009, 04:02 PM
#38
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How long do the A6's last over the season (or two)? You guys probably buy new fairly regularly, but I was curious how long they might last.
Recently I used R6 in the morning at my local track and ran 1:16 lap times. At lunchtime I tossed on my 2.5yr old Kumho V710 (well used) and the car was oversteering all over the place. Could only do 1:20. Explained why my recent autox sessions kinda sucked.
Recently I used R6 in the morning at my local track and ran 1:16 lap times. At lunchtime I tossed on my 2.5yr old Kumho V710 (well used) and the car was oversteering all over the place. Could only do 1:20. Explained why my recent autox sessions kinda sucked.
10-08-2009, 05:02 PM
#39
Rennlist Member
How long do the A6's last over the season (or two)? You guys probably buy new fairly regularly, but I was curious how long they might last.
Recently I used R6 in the morning at my local track and ran 1:16 lap times. At lunchtime I tossed on my 2.5yr old Kumho V710 (well used) and the car was oversteering all over the place. Could only do 1:20. Explained why my recent autox sessions kinda sucked.
Recently I used R6 in the morning at my local track and ran 1:16 lap times. At lunchtime I tossed on my 2.5yr old Kumho V710 (well used) and the car was oversteering all over the place. Could only do 1:20. Explained why my recent autox sessions kinda sucked.
AutoX fronts last maybe 80 runs and rears 1/2 that on the GT2. Track use on the Honda S2000 race car maybe 2 45 mile sprint races. A6's are not for the faint of budget The 1 good thing about A6's is they don't really fall off that much over their life in AutoX where V710's do have a significant drop in grip.Peter
