Bouldergramp
Posts: 88
Joined: Mon Oct 15, 2018 10:36 am
Delivery Date: 15 Oct 2018
Leaf Number: 317621
Location: COLORADO

Low tire pressure warning

Fri Feb 12, 2021 9:46 am

Well, the bitter cold arrived and the low tire pressure warning showed up on the dash display. All tires were 29 psi so there was nothing to worry about. My nearby CONOCO station with free air is closed for renovation so I just drove to Boulder Nissan and let them inflate the tires. I don't think the 2018 manual explains the low tire pressure display very well. I found this:
https://www.youtube.com/watch?v=b5pwOe9k0EY

LeftieBiker
Moderator
Posts: 16948
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Low tire pressure warning

Fri Feb 12, 2021 11:49 am

The video is a good idea, but unfortunately it encourages people to under-inflate their tires to the too-low 36psi on the label. 38-40psi is much better for all versions of the Leaf.
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jjeff
Posts: 2384
Joined: Wed Jan 13, 2016 9:10 am
Delivery Date: 13 Jul 2014
Leaf Number: 422121
Location: MSP MN

Re: Low tire pressure warning

Sat Feb 13, 2021 6:44 am

LeftieBiker wrote:
Fri Feb 12, 2021 11:49 am
The video is a good idea, but unfortunately it encourages people to under-inflate their tires to the too-low 36psi on the label. 38-40psi is much better for all versions of the Leaf.
38-40! personally, I tell people 44psi and truthfully if the max inflation of my tires were higher I'd go a couple pounds under max. One reason I tell people this is they tend to add air and then not recheck for a long time. A tire will never really gain pressure, mostly lose so I feel safe running near max inflation pressure when adding air. Note I guess if you were in a very cold area 10F, filled your tires to max a say and then drove down a mountain where it was say 75, I might change my suggestion but otherwise I feel safe at max or a couple pounds below.
What I don't understand is say I fill my tires to the max in the fall, maybe 70F. Then a couple months later it's 10F out and I recheck the tires and they are 10 or more PSI lower. I then fill the tires at this 10F to max inflation, if I then recheck the tires in the spring when it's 70F it won't be over-inflated but rather still at max or a bit below. I'd think the tires should be overinflated but they never are. I'm guessing what's going on is the tires are constantly losing just a bit of air, not a lot but just enough so the expansion from cold to hot is never really seen on the tires. It's that reason for the most part I suggest max inflation and don't really worry about it, especially on a vehicle as heavy as a Leaf(for its tire size) as I want its sidewall flexing as little as possible to avoid undue wear.
Our latest Prius tires show a 54max PSI on the tire, those I only fill to 51/52 as 54 does seem quite high. Also note I'm assuming you have an accurate tire pressure gauge as I have, if you think it might say read 5psi low or something then don't inflate to max, then you'd actually be over by 5psi which probably wouldn't be good.
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knightmb
Posts: 945
Joined: Mon Jan 12, 2015 7:41 pm
Delivery Date: 26 Feb 2021
Leaf Number: 306291
Location: Franklin, TN

Re: Low tire pressure warning

Sat Feb 13, 2021 10:46 am

Have to agree, 36 psi or under is way too low for the vehicle. I inflated all my tires to max (44 psi) in the morning before the sun comes up and warms the tires up on one side, causing uneven inflation. I did this after the vehicle sits overnight to make sure the tires are cold. During the day, I check the tire pressure from time to time, but the cold keeps the tires from gaining much extra pressure even when driving all day. Easy, safe area is 40 psi if your tires max at 44 psi, when it gets really cold at night, you'll find your tire sensor light coming on every time if the tires were last inflated in fall/summer weather by now. :o

Now, having said that, if it is snowing everywhere and you need to deflate your tires for more traction, then more power to you!
2020 Leaf SL Plus - (Manufacture Date March 2020)
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LeftieBiker
Moderator
Posts: 16948
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: Low tire pressure warning

Sat Feb 13, 2021 1:09 pm

I don't suggest higher pressures in Winter because of possible loss of traction in snow and ice. I used to tell people "10% below sidewall listed max pressure" and that still applies in warm weather and snowless climes.
Brilliant Silver 2021 Leaf SV40 W/ Pro Pilot & Protection
2009 Vectrix VX-1 W/18 Leaf modules, & 2 lithium E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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