09-18-2015, 07:51 AM
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#1
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,799
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OOPS, missed a piece of the formula when I copied it. I corrected it in my post
Was Pr = ((Wr*Tf)/(Wf*Tr)
the correct formula is:
Pr = ((Wr*Tf)/(Wf*Tr) ) * Pf
in your case - 1.078 * front pressure = rear pressure
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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09-18-2015, 08:05 AM
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#2
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by JayG
OOPS, missed a piece of the formula when I copied it. I corrected it in my post
Was Pr = ((Wr*Tf)/(Wf*Tr)
the correct formula is:
Pr = ((Wr*Tf)/(Wf*Tr) ) * Pf
in your case - 1.078 * front pressure = rear pressure |
Excessive mental masturbation!
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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09-18-2015, 08:12 AM
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#3
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,799
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Quote:
Originally Posted by BYprodriver
Excessive mental masturbation!
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an exercised brain is a strong one 
All seriousness aside, I have been trying to find the "right" tire pressures and this give me a good starting point for even balance. Had far too much understeer with the factory pressures.
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
Last edited by JayG; 09-18-2015 at 08:14 AM.
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09-18-2015, 08:20 AM
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#4
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by JayG
an exercised brain is a strong one
All seriousness aside, I have been trying to find the "right" tire pressures and this give me a good starting point for even balance. Had far too much understeer with the factory pressures. |
986 has been around awhile, I could have told you where to start psi.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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09-18-2015, 08:27 AM
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#5
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,799
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Quote:
Originally Posted by BYprodriver
986 has been around awhile, I could have told you where to start psi.
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Ok, where? 
__________________
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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09-18-2015, 08:33 AM
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#6
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by JayG
Ok, where? |
33 F 34 R always better to start on the high side if you have no idea, less shoulder wear, & faster & easier to reduce pressure than add.
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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09-18-2015, 08:29 AM
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#7
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Rennzenn
Join Date: Feb 2005
Location: Virginia
Posts: 1,369
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thanks for the update. Math is now sound!
__________________
Rennzenn
Jfro@rennzenn.com
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2004 Porsche Boxster S
2004 Porsche 996 Targa
Mean Motor Scooter
986RS
Long term project...
Fiat 500 Abarth Cabriolet
Hybrid Mode
