:NERD ALERT: Braking data
Aug 14, 2009, 12:57 PM
#31
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Jid2's power must be pretty impressive, 135 before the kink is pretty good. As reference I have topped out at 145 way down after turn 1. That takes a lot of wot on my car. 135 is what I typically get to before turn 2. Jid2 is doing 135 about three hundred yards before my car.
Aug 14, 2009, 01:15 PM
#32
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I don't think I'm at 135 before the kink, it's more like right after the kink I'm at 135 and then I've been coasting through turn 1.
nothere runs 255 NT01's I believe.
nothere runs 255 NT01's I believe.
Sep 10, 2009, 06:49 AM
#34
Got some more braking data for ya'lls. This is from last weekend at Gingerman Raceway in South Haven, MI. Yeah, I ran about 3.5 seconds faster with the R6's, but that's also another session on my belt on a brand new track for me. If you look at the G data, the R6's actually help me brake more significantly than the lateral part. Keep in mind; new track so maybe driving 7 or 8/10's at best.
Red: 245 Dunlop Z1 StarSpec street tires. My 2nd session EVER on this track. 1:39x
Blue: 245 Hoosier R6 (w/ 6 heat cycles). My 3rd session EVER on this track. - 1:35.7
Red: 245 Dunlop Z1 StarSpec street tires. My 2nd session EVER on this track. 1:39x
Blue: 245 Hoosier R6 (w/ 6 heat cycles). My 3rd session EVER on this track. - 1:35.7
Last edited by boomn29; Sep 10, 2009 at 07:53 AM.
Sep 10, 2009, 07:45 AM
#36
Got some more braking data for ya'lls. This is from last weekend at Gingerman Raceway in South Haven, MI. Yeah, I ran about 3.5 seconds faster with the R6's, but that's also another session on my belt on a brand new track for me. If you look at the G data, the R6's actually help me brake more significantly than the lateral part. Keep in mind; new track so maybe driving 7 or 8/10's at best.
Blue: 245 Dunlop Z1 StarSpec street tires. My 2nd session EVER on this track. 1:39x
Red: 245 Hoosier R6 (w/ 6 heat cycles). My 3rd session EVER on this track. - 1:35.7
Blue: 245 Dunlop Z1 StarSpec street tires. My 2nd session EVER on this track. 1:39x
Red: 245 Hoosier R6 (w/ 6 heat cycles). My 3rd session EVER on this track. - 1:35.7
Did you get the red and blues mixed up?
Scorke
Sep 10, 2009, 08:01 AM
#39
Furthermore from Gingerman, here's data on the first few corners. My best lap from sat vs best lap from sunday. Track conditions pay a lot into this, as does a new set of rubber!
Blue: Sat - stickered Hoosier A6's - noon (after the track was dead for 2 hours)
Red: Sun - Hoosier R6's - 4:30pm
The Red line results in a 2.2 second faster lap. But check out how much was gained in just these couple braking zones! 1.21g braking...
Blue: Sat - stickered Hoosier A6's - noon (after the track was dead for 2 hours)
Red: Sun - Hoosier R6's - 4:30pm
The Red line results in a 2.2 second faster lap. But check out how much was gained in just these couple braking zones! 1.21g braking...
Last edited by boomn29; Sep 10, 2009 at 08:07 AM.
Sep 17, 2009, 03:04 PM
#41
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jid2,
Nice thread! I love data acq... fun stuff!
However, you brake like a sissy!!!
or maybe your pads are not up to the task. Not sure how the ST43's compare to real "race" pads like Hawk DTC-70 or PFC01's, etc. With the right pads, you should be able to decel with as many g's as you can corner. For example, I can decel around 1.7g's at Road America in my e36 M3 w/ stoptech calipers and Hawk DTC-70's. I go straight from the gas to brake, and I mash that ****er HARD. Allah gave me ABS so I could use it, lol. I notice on the long g graph, your transitions from gas to brake seem "leisurely". How hard are you mashing the stop pedal?
Nice thread! I love data acq... fun stuff!
However, you brake like a sissy!!!
or maybe your pads are not up to the task. Not sure how the ST43's compare to real "race" pads like Hawk DTC-70 or PFC01's, etc. With the right pads, you should be able to decel with as many g's as you can corner. For example, I can decel around 1.7g's at Road America in my e36 M3 w/ stoptech calipers and Hawk DTC-70's. I go straight from the gas to brake, and I mash that ****er HARD. Allah gave me ABS so I could use it, lol. I notice on the long g graph, your transitions from gas to brake seem "leisurely". How hard are you mashing the stop pedal?
Sep 17, 2009, 04:51 PM
#44
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I'm still leaving a fair amount of braking torque on the table, and I'm not trailing them into the two main braking corners. Still working on my car's setup. I've spun the car on both those corners trailing the brakes in, and both those main braking zones have bumpy pavement, one of them downhill - both with crappy runout. Next year should be better as I've spent this year fixing major issues and doing zero chassis tuning. I've also realized my 2 year old BFG R1's I got used are not so grippy anymore...
What tires are giving you 1.7 g's?
Sep 17, 2009, 04:57 PM
#45
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Toyo R888 235/40-17's. Nothing spectacular. The 1.7 number is peak, but I can sustain around 1.2g's decel.
I wouldn't worry about trail braking... safest to do the majority of your hard braking in a straight line anyways. Work on making a SHARP transition from gas to brake, and braking hard until you ease off for corner entry. If there is any coasting in-between (and the traqmate will show it), then you started braking too early and need to push it another .5 brake markers deeper.
CLiff notes:
Haul *** full throttle until you about **** your pants. Then hit the brakes f-ing HARD, not because you want to, but out of self-preservation.
I wouldn't worry about trail braking... safest to do the majority of your hard braking in a straight line anyways. Work on making a SHARP transition from gas to brake, and braking hard until you ease off for corner entry. If there is any coasting in-between (and the traqmate will show it), then you started braking too early and need to push it another .5 brake markers deeper.
CLiff notes:
Haul *** full throttle until you about **** your pants. Then hit the brakes f-ing HARD, not because you want to, but out of self-preservation.