ASK THE COACH
06-04-2013, 10:51 AM
#1321
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Geat this is what I felt was the correct answer and ordered the narrow tires for the fronts on my rain set. So 235/255 they arrive today ready for COTA this weekend. Just in case VR gets more rain up there.
06-04-2013, 05:04 PM
#1323
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Jenner, I posted this a while ago in another thread but here's onboard with yours truly at Limerock during a Skip Barber MX-5 race last year -- on street tires. Slo-mo version of Patrick Long's action above (especially the three-wide pass down main straight at 4:45) 
. Watch:
- the line
- how I try to brake as late and as little as possible (Each unnecessary loss of momentum is much more costly in a low-powered car.)
- how I try to get on throttle as early as possible
- how hand-work (car control) allows me to explore those limits
[Spoiler: I won
. Most passing action is in the first 13mins. The rest is just keeping things safe at P1 until the finish.]
http://vimeo.com/51112352
. Watch: - the line
- how I try to brake as late and as little as possible (Each unnecessary loss of momentum is much more costly in a low-powered car.)
- how I try to get on throttle as early as possible
- how hand-work (car control) allows me to explore those limits
[Spoiler: I won
. Most passing action is in the first 13mins. The rest is just keeping things safe at P1 until the finish.]http://vimeo.com/51112352
I'll see what I can do to mimic you next week.
06-04-2013, 06:34 PM
#1324
Rennlist Member
Thanks for the compliments Matt. There's a '1 sec' trick to the uphill. If you don't know it and you tried to copy my line you are likely to hit the armco before the crest or spin after it. I could tell you what the trick is but then I'd have to kill you.
06-04-2013, 11:56 PM
#1325
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Or, I'm pretty good at the spinning part. I could do that on my own.
06-05-2013, 12:51 AM
#1327
Rennlist Member
Matt, LOL!
By '1 sec' I meant it would take 1 sec off your lap time.
Gary, stop spilling the beans!
By '1 sec' I meant it would take 1 sec off your lap time.
Gary, stop spilling the beans!
06-05-2013, 08:03 AM
#1328
Rennlist Member
shock and sway bar settings
Just picked up a new (to me) 996 C4 with PSS9's and HR adj sways installed. First track weekend for this car coming up this week. All of my previous track time has been in my 964 C4's of various configurations but mostly stock. Suggestions for starting points for the shock settings and sway bar settings? I assume something short of full stiff on everything. A good starting point and then a progression of changes. On the 964's my primary adjustments have been limited to changes in tire pressures, to make changes in the car (stock sways w/o adjustment).
Of course, I know the biggest variable and current limitation is the nut that holds down the seat. And, I do drive Flat Out
Of course, I know the biggest variable and current limitation is the nut that holds down the seat. And, I do drive Flat Out
06-05-2013, 09:47 AM
#1332
Rennlist Member
Genius!
Sorry, really not being a smarta$$. I figured I would try somewhere in the middle to start. The question is - what would be an order of changes to make, a sort of Design of Experiments (yes, I'm a process development engineer-geek). My 964 C4 would understeer a lot, and I always wanted to try a stiffer rear bar or rear springs (although I know that a chunk of the problem was my inability to set up for a late apex so I could get on the power on exit without plowing off the track). So, I will see how this new car feels, and I know I will be tempted to stiffen up the rear bar or soften the front bar. I don't have a clue how to "read" the car and make appropriate adjustments to the shocks.
THANKS
Sorry, really not being a smarta$$. I figured I would try somewhere in the middle to start. The question is - what would be an order of changes to make, a sort of Design of Experiments (yes, I'm a process development engineer-geek). My 964 C4 would understeer a lot, and I always wanted to try a stiffer rear bar or rear springs (although I know that a chunk of the problem was my inability to set up for a late apex so I could get on the power on exit without plowing off the track). So, I will see how this new car feels, and I know I will be tempted to stiffen up the rear bar or soften the front bar. I don't have a clue how to "read" the car and make appropriate adjustments to the shocks.
THANKS
06-05-2013, 09:55 AM
#1333
Rennlist Member
Thread Starter
IMO you want to get the compression set first, and in an ideal world, want to run as little coompression as you can get away with.
Then get rebound set, and in an ideal world want to run as much rebound as the car can take. It will probably take more in the back end than the front.
However, Putnam is far from an ideal world, so adjust one thing at a time, then wriite down your impression of how the car's behavior changes under braking, corner entry, apex, and WOT track out.
JMHO...
Then get rebound set, and in an ideal world want to run as much rebound as the car can take. It will probably take more in the back end than the front.
However, Putnam is far from an ideal world, so adjust one thing at a time, then wriite down your impression of how the car's behavior changes under braking, corner entry, apex, and WOT track out.
JMHO...
06-05-2013, 09:57 AM
#1334
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Genius!
Sorry, really not being a smarta$$. I figured I would try somewhere in the middle to start. The question is - what would be an order of changes to make, a sort of Design of Experiments (yes, I'm a process development engineer-geek). My 964 C4 would understeer a lot, and I always wanted to try a stiffer rear bar or rear springs (although I know that a chunk of the problem was my inability to set up for a late apex so I could get on the power on exit without plowing off the track). So, I will see how this new car feels, and I know I will be tempted to stiffen up the rear bar or soften the front bar. I don't have a clue how to "read" the car and make appropriate adjustments to the shocks.
THANKS
Sorry, really not being a smarta$$. I figured I would try somewhere in the middle to start. The question is - what would be an order of changes to make, a sort of Design of Experiments (yes, I'm a process development engineer-geek). My 964 C4 would understeer a lot, and I always wanted to try a stiffer rear bar or rear springs (although I know that a chunk of the problem was my inability to set up for a late apex so I could get on the power on exit without plowing off the track). So, I will see how this new car feels, and I know I will be tempted to stiffen up the rear bar or soften the front bar. I don't have a clue how to "read" the car and make appropriate adjustments to the shocks.
THANKS
Set your shocks at 7 front and 8 rear. Forget about them.
Set your H&R bars at the outside hole all four corners. Forget about them.
Go drive, do DE's, listen to your instructors. Drive more. Correct your elementary mistakes and you'll learn to read the car a bit better.
You won't make any more adjustments than the ones I've outlined above (beyond tire pressure).
Cheers, have fun.
06-05-2013, 01:46 PM
#1335
Rennlist Member
Can't help myself from overanalyzing.
Just to clarify - PSS9 settings 7F 8R, for 1=soft 9=stiff ? I seem to recall that these are different order on different applications for some odd reason.
Curious about your choice of full soft on the F+R sway bars - logic?
Agree - need to tighten down the nut that holds down the seat. Can't wait to get some seat time in the new car. It is SO different from the 964. Doesn't even feel like a real Porsche, let alone smell like one. Glad I kept one of each, and swing both ways. And, no, I'm not trying to start a fight.
Thanks for the input.
Just to clarify - PSS9 settings 7F 8R, for 1=soft 9=stiff ? I seem to recall that these are different order on different applications for some odd reason.
Curious about your choice of full soft on the F+R sway bars - logic?
Agree - need to tighten down the nut that holds down the seat. Can't wait to get some seat time in the new car. It is SO different from the 964. Doesn't even feel like a real Porsche, let alone smell like one. Glad I kept one of each, and swing both ways. And, no, I'm not trying to start a fight.
Thanks for the input.