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Jimmydreams
Posts: 1500
Joined: Fri Apr 23, 2010 6:44 pm
Delivery Date: 08 Jan 2011
Leaf Number: 0175
Location: Oceanside, Ca.
Contact: Website

Tire Pressure

Mon Feb 21, 2011 8:56 pm

I felt my range was dropping just a bit lately (although I HAVE been using my heater in the morning a lot).....so tonight I decided to check the tire pressure:

Door-jamb label calls for 36psi all the way around.

All my tires were at 33psi.

I filled them up to 40psi (max pressure is 44psi as listed on the tire).

I'm guessing I see a noticeable bump in range tomorrow. I wonder what the delivered pressure was?!? Check your tire pressure, folks!!
JimmyD
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derkraut
Posts: 1517
Joined: Fri Jul 16, 2010 7:39 pm
Delivery Date: 14 Jun 2011
Leaf Number: 004248
Location: San Diego vicinity

Re: Tire Pressure

Mon Feb 21, 2011 9:01 pm

Jimmydreams wrote:I felt my range was dropping just a bit lately (although I HAVE been using my heater in the morning a lot).....so tonight I decided to check the tire pressure:

Door-jamb label calls for 36psi all the way around.

All my tires were at 33psi.

I filled them up to 40psi (max pressure is 44psi as listed on the tire).

I'm guessing I see a noticeable bump in range tomorrow. I wonder what the delivered pressure was?!? Check your tire pressure, folks!!
Even tho' it will ride a bit harsher, I would run with 44psi cold on all 4 tires. It makes a difference of about 3-4mpg on my Prius, due to lower rolling resistance.
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prberg
Posts: 227
Joined: Sun May 23, 2010 4:59 pm
Delivery Date: 26 Jun 2015
Location: Burbank, California

Re: Tire Pressure

Mon Feb 21, 2011 9:50 pm

Thanks for the reminder to check the tire pressure. How low does it have to get before the TPMS will give us a warning on the dashboard?

-Peter

LEAFfan
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Re: Tire Pressure

Mon Feb 21, 2011 10:31 pm

prberg wrote:Thanks for the reminder to check the tire pressure. How low does it have to get before the TPMS will give us a warning on the dashboard?

-Peter
My wife's car's low pressure light comes on at about 28, but with these LRTs, I read on the tire website (someone had posted a link a few months ago) that they take higher pressures than regular tires. I found the link: http://www.tirerack.com/tires/tires.jsp ... opia+EP422
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Herm
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Re: Tire Pressure

Tue Feb 22, 2011 5:47 am

The maximum pressure you should pump them up to will be listed on the sidewall, note this is measured when the tire is cold. Many people routinely exceed that pressure, some up to 100psi, but you risk a blow out.

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Gonewild
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Leaf Number: 229
Location: Chandler, AZ

Re: Tire Pressure

Tue Feb 22, 2011 8:41 am

I am going to run 40 psi for a little better empg
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DaveinOlyWA
Posts: 14230
Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 16 Nov 2019
Leaf Number: 319862
Location: Olympia, WA
Contact: Website

Re: Tire Pressure

Tue Feb 22, 2011 9:25 am

the max pressure on the sidewall is for ultimate safety margins. u can, under "normal" circumstances, easily exceed the rating by 50% with minimal compromise to your safety.

now, we cant always predict that driving conditions will be normal and a sudden pothole may be unavoidable.

i put my tires to 42 PSI all the way around on day 2 of ownership. i have no doubt that it makes a difference. on my Prius, i am guessing that i am getting 2 mpg increase from the standard 35/33 to 42/40 F/R
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 412 mi, 99.72% SOH
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DarkStar
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Delivery Date: 25 Mar 2011
Leaf Number: 568
Location: Hillsboro, Oregon, USA
Contact: Website

Re: Tire Pressure

Tue Feb 22, 2011 10:30 am

Per the Service Manual, it states that the TPMS light will come on at 28 psi. (Section WT: Road Wheels & Tires)
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DaveinOlyWA
Posts: 14230
Joined: Sat Apr 24, 2010 7:43 pm
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Leaf Number: 319862
Location: Olympia, WA
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Re: Tire Pressure

Tue Feb 22, 2011 11:18 am

so TPMS is not adaptive? i am kinda sorta sure that the Prius is...since it does have a reset button.

that is a bummer. if i set my PSI at 42, i want to be alerted when the tire hits 36 PSI at worst.
2011 SL; 44,598 mi, 87% SOH. 2013 S; 44,840 mi, 91% SOH. 2016 S30; 29,413 mi, 99% SOH. 2018 S; 25,185 mi, SOH 92.23%. 2019 S Plus; 412 mi, 99.72% SOH
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TomT
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Leaf Number: 000360
Location: California, now Georgia
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Re: Tire Pressure

Tue Feb 22, 2011 3:02 pm

And you read this where? And by that, I mean from an actual tire manufacturer or other respected authority.

This is from the DOT's website:

Maximum Permissible Inflation Pressure:
This number is the greatest amount of air pressure that should ever be put in the tire under normal driving conditions.

DaveinOlyWA wrote:the max pressure on the sidewall is for ultimate safety margins. u can, under "normal" circumstances, easily exceed the rating by 50% with minimal compromise to your safety.
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