02-13-2014, 06:09 AM
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#1
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Registered User
Join Date: Apr 2012
Location: Riverside, CA
Posts: 1,665
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Pushing?
A while back while I was Auto-Xing I recalled the instructor saying that the car was "pushing" while going through some S turns and I can't recall what that mean't exactly.
Based on what was happening at the time in an S curve, I was accelerating out of the first turn and it seemed like I was getting a bit of understeer going on while trying to get to the apex of the next curve.
Can anyone clarify that term "pushing" and suggest if that is something that can be helped by driving style, adjusting camber, tire width or pressures.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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02-13-2014, 06:59 AM
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#2
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Track rat
Join Date: Nov 2006
Location: Southern ID
Posts: 3,701
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Pushing= understeer. You turn the wheel and nothing happens or it happens too slowly.
Possible solutions:
Run a wider front tire.
Increase front negative camber.
Re-distribute weight in the car to move more of it to the front.
Add rake to your suspension setup
Change the rear sway bar to get the car to rotate more easily.
My Performance driving definitions for dummies:
Understeer (push)- When you hit the wall with the front of your car.
Oversteer (loose)- When you back your car into the wall.
Horsepower- How fast you hit the wall.
Torque- How far you move the wall when you hit it.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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02-13-2014, 07:39 AM
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#3
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Registered User
Join Date: Oct 2013
Location: San Jose, CA
Posts: 583
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Quote:
Originally Posted by Topless
My Performance driving definitions for dummies:
Understeer (push)- When you hit the wall with the front of your car.
Oversteer (loose)- When you back your car into the wall.
Horsepower- How fast you hit the wall.
Torque- How far you move the wall when you hit it.

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Fantastic!!
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2000 S - Borla Exhaust, TS Cat Deletes, RSS UDP, B&M Short Shift, T96 Steering Wheel, Potenza RE-71R's,
Mantis 2.0L Deep Sump, de-snorkeled, Bilstein PSS9 Coil-Overs, Rennline lug studs, and auto crossed regularly.
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02-13-2014, 08:01 AM
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#4
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Registered User
Join Date: Apr 2010
Location: Canada
Posts: 3,128
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get more weight onto your front wheels. braking shifts the weight to the front, so brake harder, later, so that the front wheels are loaded when you turn in. a strong turn in might allow you to apex a little later so that you have less turn out when getting on the gas and less push when accelerating out of the turn.
tires will squawk when they slip sideways; when your front tires start to make noise you think that you're driving like a basa$$ when really you are just overdriving the car through the turn.
wider fronts is a huge improvement - 235 on an 18" rim is the ticket.
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02-13-2014, 08:15 PM
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#5
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Registered User
Join Date: Apr 2012
Location: Riverside, CA
Posts: 1,665
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Haa, great definitions
That helps, next tire change I'll go from 215's in front to 235's if they'll fit my rims.
__________________
"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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02-14-2014, 01:18 PM
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#6
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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Quote:
Originally Posted by jb92563
Haa, great definitions
That helps, next tire change I'll go from 215's in front to 235's if they'll fit my rims.
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Yes, 235's will fit on a 7.5" width rim. This will help quite a bit with reducing the push.
Regarding braking hard to put weight on the front tires, I prefer not to use this technique as it tends to upset the balance and unless you are very careful, it can result in over-slowing. Remember, smooth is fast.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
Last edited by thstone; 02-14-2014 at 01:26 PM.
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