09-30-2014, 10:44 PM
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#1
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Aussie Boxster
Join Date: Sep 2014
Location: Canberra
Posts: 6
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Tyre Pressures
Hi folks.
I'm guessing this question has been asked many times, but what tyre pressures do people use in their Boxsters? I drive a 2003 'S' and am running 30/36 lbs. front/back. The car has 18 inch wheels with nitrogen filled rubber at present, in its
Front: 225/40/R18
Rear: 265/35/ZR18
Falkon tyres.
I'd be very glad of your insights / ideas.
Thanks heaps.
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10-01-2014, 06:10 AM
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#2
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,794
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Well first of all you spelled Tire wrong 
USA factory spec is 29/36
I generally run 30/36 as well. I prefer the handling that way
__________________
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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10-01-2014, 06:47 AM
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#3
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Registered User
Join Date: Aug 2009
Posts: 1,466
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You might try looking on the door sill and then the owners manual.
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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10-01-2014, 06:59 AM
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#4
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,794
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The tire pressure placard is not on the door sill, its on the gas door
__________________
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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10-01-2014, 08:09 AM
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#5
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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 Simon Wooldridge
Hi folks.
I'm guessing this question has been asked many times, but what tyre pressures do people use in their Boxsters? I drive a 2003 'S' and am running 30/36 lbs. front/back. The car has 18 inch wheels with nitrogen filled rubber at present, in its
Front: 225/40/R18
Rear: 265/35/ZR18
Falkon tyres.
I'd be very glad of your insights / ideas.
Thanks heaps.
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30/36 is the perfect baseline. I like to go as high as 34psi in the front if the roads are smooth enough/tires are balanced good enough.
34psi in rear if it's just me in the car. (mimimum weight)
__________________
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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10-05-2014, 12:37 PM
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#6
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Aussie Boxster
Join Date: Sep 2014
Location: Canberra
Posts: 6
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Tire / Tyre ?
I guess 'tire' works for American english.
Thanks for the help. 30/36 is the recommended figure; I'll try (tri?) 32/36 sometime but on our goat-track B roads, 30 might be the way to go.
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10-05-2014, 06:15 PM
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#7
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On the slippery slope
Join Date: Mar 2014
Location: Austin and Palm Springs
Posts: 3,794
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Quote:
Originally Posted by Simon Wooldridge
Tire / Tyre ?
I guess 'tire' works for American english.
Thanks for the help. 30/36 is the recommended figure; I'll try (tri?) 32/36 sometime but on our goat-track B roads, 30 might be the way to go.
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Just messing with you mate.
Welcome to the forum
I would try some different pressures, and see how you like the changes in handling. Factory pressure tends to have understeer
Btw, we need pics!
__________________
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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10-17-2014, 04:22 PM
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#8
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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Quote:
Originally Posted by JayG
The tire pressure placard is not on the door sill, its on the gas door
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my tyre pressure is under my frunk.  And, as tire "tyre" manufacturing changes, so could optimum pressure. AND, what kind of driving you are doing...AND different brands of tires with different rubber characteristics. I'm running the factory spec tyres, whatever they are, Bridgestone? Firestone? Anyway, factory tires and 30/36. It rides rougher for sure, corners better. If I drop it to 26/32. Smoother ride but then the suspension doesn't feel as tight. Due to squishy tyres.
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10-20-2014, 07:47 AM
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#9
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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 jdlmodelt
my tyre pressure is under my frunk. And, as tire "tyre" manufacturing changes, so could optimum pressure. AND, what kind of driving you are doing...AND different brands of tires with different rubber characteristics. I'm running the factory spec tyres, whatever they are, Bridgestone? Firestone? Anyway, factory tires and 30/36. It rides rougher for sure, corners better. If I drop it to 26/32. Smoother ride but then the suspension doesn't feel as tight. Due to squishy tyres.
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There have been no changes to recommended tire psi for 986's since they were 1st made in 1996, assuming recommended tire sizes are used.
__________________
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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2004 Porsche Boxster S
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