Discussion: ST2 vs PTA vs...
#136
The NASA ST-2 championship race was 40 minutes and I had plenty of gas left with mixed wet/ dry conditions. I run Sunoco 100, 650 injectors with a rich tune. I don't yet know whether it would be the same on a completely dry Mid Ohio track. Looks possible. I don't believe it would be the same case on a bigger track like Watkins Glen were you would see greater % full throttle.
I need to get me a Traq Mate, but I would not be surprised if I spent 70% or more of the time WOT at RA.
#137
It's also a few % pts higher in the summer with the motors are bogged down, lower % in the winter when the motors are making 40 more hp.
Most FI cars I'm behind, my eyes are watering from the exhaust, they'd need 30 gallon tanks to run 45 mins
Justin when are you gonna come down to RA and run ST2?
#138
One route to take is to go to full slick, down in power, which in that range we can make on 93 all day long. Question then becomes how much knock protection do you get pound for pound with Sunoco or VPower Vs going to something like 94 or 98. Is the cost difference really give you peace of mind or are you crazy. Like a few others said, the slicks will go faster, last longer, at the rate the Evo uses tires it may not be a bad choice. You'd experience less wear and tear on the motor, but other things like bearings, brakes, brain matter would go out quicker..
Last edited by Balrok; Nov 9, 2011 at 01:32 PM.
#140
It's about 68% for me in TTA (C5Z) on a ***** out lap. VIR is about 62%. It wouldn't take much downforce to be above 70% at RA.
It's also a few % pts higher in the summer with the motors are bogged down, lower % in the winter when the motors are making 40 more hp.
Most FI cars I'm behind, my eyes are watering from the exhaust, they'd need 30 gallon tanks to run 45 mins
Justin when are you gonna come down to RA and run ST2?
It's also a few % pts higher in the summer with the motors are bogged down, lower % in the winter when the motors are making 40 more hp.
Most FI cars I'm behind, my eyes are watering from the exhaust, they'd need 30 gallon tanks to run 45 mins
Justin when are you gonna come down to RA and run ST2?
Matt, im confused. What are you talking about?
#142
But back on topic. So Buel for the hoho slicks you have run, what cold/hot pressures did you find worked? I've been hearing start at 20 cold, 30 hot?
#143
Basically in that range. And Hoosier recommends you increase your hot pressures on banked tracks by about 2psi.
#145
Seems a couple of the fast ST-2 Vettes that run A's start them around 20 psi.
#146
Youll be fine. Ive started them lower than that a few times. Do a couple accelerate/brake exercises on your warmup lap and youll be good to go. After the race youll notice the sidewalls were scrubbed in, dont worry about it because that will only happen on the warmup. To minimize it avoid swerving side to side when the tires are cold.
#148
Nice thing about PTA is you can go run ST2 whenever you want (same power/weight and same tire size adjustments).
If you are ST2, you can't go run PTA.
#149
I did a year of TT in '03 with another group. I started running w/ NASA in TTA in '09. I started in PTA at the start of '11. I flip between TT and W2W.
Nice thing about PTA is you can go run ST2 whenever you want (same power/weight and same tire size adjustments).
If you are ST2, you can't go run PTA.
Nice thing about PTA is you can go run ST2 whenever you want (same power/weight and same tire size adjustments).
If you are ST2, you can't go run PTA.
Do you have any input on any of this? Or anything about the C5Z? And if you dont mind, what are the specs on your car? Like whats your competition weight, tire size/compound, whp, and anything else you think is noteworthy?
#150
Most run the 275 A6; and I guarantee they're all right on the legal power/weight limit because it's easy to get there with their insanely low comp weight! Some run the 255 A6 and suspension. That's pretty much your choice. Some do intake; some do bars; some do exhaust.
I've been discussing exactly this for years! I think 9 of the 14 cars in TTA at Nationals were C5Z's. The MW/GL 'home' region I'm in swept the TTA podium; myself and 2 C5Z's.