Higher Tire Pressure - Page 2 - Toyota Yaris Forums

NJBob · 01-25-2009, 08:35 AM

I have mine at 40 but I don't know that it makes that much difference. The door recommendations are more for comfort. Acceleration and grip is negligible on a whopping 106 hp 4 banger. Bottom line.....unless you're a "better mileage" freak/hyper miler it doesn't really matter.

SailDesign · 01-25-2009, 10:46 AM

Bob,
When you have to cross a 2-mile bridge, high enough to get even an aircraft carrier under, every day in whatever weather is thrown around that day, believe me - you will notice the difference between "standard" pressure 60-series tires and high-pressure 45-series tires. In a 50-mph cross-wind the stock tires and pressure felt plain unsafe. The high-pressure lower profile tires feel fine, and I do not get bump-steer or white-lining at 42 psi except under hard braking. And my braking distance is soooo much shorter with the better compound that it more than makes up for the aspect ratio of the patch.

gid · 01-25-2009, 01:23 PM

few years ago we test drove an '06 Scion XB and rode like crap . When hit bumps in the road would almost send yeh through the roof . We were like " what a crappy ride " . So , turned around after traveling a few blocks and went back to dealer where I checked the tire pressure . 45 p.s.i. !!! So , let air out of all tires to around 34 p.s.i. and we went back out for another test drive and what a difference . Much more smoother and not bouncing out of our seats . I try to remember to check air pressure in all new / used cars before a test drive . Can be misleading and give misconception of the ride and handling . Many dealerships don't prep cars all that well . We did get an '06 automatic Scion XB , but at another TOYO dealer that's on the other side of town .

YarisSedan · 01-25-2009, 01:56 PM

Quote:

Originally Posted by ddongbap

You're going to have two different PSI readings. One for warm tires, and another for cold tires. Unless you're using nitrogen, of course.

You mean INCREASE.

oh yeah sorry i posted this late at night was really sleepy lol

MadMax · 01-25-2009, 06:06 PM

gid

I usually find dealer's underinflate tires on cars to make them ride smoother during test drives.

I just pumped my tires up to 40 PSI, the ride is a little harsher but not that bad; and based on our drive home from Buda yesterday, the gas mileage has increased a little (we took back roads so our speed was more reasonable versus going down IH-35). I just refueled but got 75 miles out of the first "bar" of gas, which is pretty good. I am going to go easy and keep it to 70 MPH and below, and see how much that and my increased tire pressure helps my gas mileage.

Cheers! M2

gid · 01-26-2009, 01:15 AM

I just got 68 miles before losing 1st bar with tires at 34 . Gotta consider it's very cold here . Temps have been averaging 15 degrees .

gid · 01-26-2009, 01:18 AM

when they ship new cars they inflate tires up to 45 p.s.i.. Figure due to the the vehicles sitting around for period of time and in case have a leaky tire(s) .

.

ddongbap · 01-26-2009, 03:24 AM

Quote:

Originally Posted by gid

when they ship new cars they inflate tires up to 45 p.s.i.. Figure due to the the vehicles sitting around for period of time and in case have a leaky tire(s) .

.

I think its cause it'll help prevent any folding of the tire.

yaris-me · 01-26-2009, 03:40 AM

So if we split the difference, 37 would be a good tire pressure?

SilverBack · 01-26-2009, 05:28 AM

Over-inflating reduces your grip on the road. Mine was understeering after I filled the front tires at the gas station because the air looked kinda low, so I let some out to bring it back to the way it is after I got home.

Off-topic (kinda): If you want your tires to hold its' air all-year-round, fill them with nitrogen inside of oxygen. Oxygen has moisture in it, so it'll expand and contract with seasonal temperature changes. This makes your tires under-inflated on cold days, and over-inflated on hot days. Nitrogen is bone-dry, so it won't do anything inside your tires

SailDesign · 01-26-2009, 07:25 AM

Quote:

Originally Posted by k r a y z e e . j o j o

Off-topic (kinda): If you want your tires to hold its' air all-year-round, fill them with nitrogen inside of oxygen. Oxygen has moisture in it, so it'll expand and contract with seasonal temperature changes. This makes your tires under-inflated on cold days, and over-inflated on hot days. Nitrogen is bone-dry, so it won't do anything inside your tires

Krayzee - this is pure, unadulterated BS. Nothing personal, this is what everyone is saying, after all. However, if you look up "Boyle's Law", you'll note that ALL gases expand and contract with the heat. It is part of being a gas.
What nitrogen does that is better than plain ol' air is that it doesn't degrade the tires, due to a lack of oxygen. However, as anyone with winter and summer tires hanging in the garage 6 months of the year will know, the tires them selves wear out before the insides get brittle due to atmospheric problems.
Nitrogen does NOT leak out more slowly than air. Air is 80-some percent nitrogen and therefore should behave pretty much exactly the same. Other "parts" of air have larger molecules even than nitrogen, so would "leak" even slower.

Let's all try t okeep up here, OK?

Nitrogen is simply a great way to make money from people who like fads.

MUSKOKA800 · 01-26-2009, 12:19 PM

I ran at 42# in my sedan for many thousands of kilometres. Put them down to 32 before winter. Removed them all together after on taste of ice (Goodyear LS).

Kioshi · 01-26-2009, 12:35 PM

I dont want to debate or make it seem like an argument SailDesign, cause your a kool person w/ info and suggestions. I've been using nitrogen since Jan 2008. During warm weather I've noticed that my tires dont loose air as much, as i check my tire pressure every 4 weeks or so. Now during winter Nov-Dec, driving to Tahoe and elsewhere, I've had to fill up my tires at an earlier period (usually it would be 3-4 months in summer w/ nitrogen, vs winter it was 2-3 months). This is just my experience excluding any science ^_^.

My setup, 205/40/17 Falkens~ 45psi nitrogen..

SailDesign · 01-26-2009, 01:50 PM

Quote:

Originally Posted by Kioshi

I dont want to debate or make it seem like an argument SailDesign, cause your a kool person w/ info and suggestions. I've been using nitrogen since Jan 2008. During warm weather I've noticed that my tires dont loose air as much, as i check my tire pressure every 4 weeks or so. Now during winter Nov-Dec, driving to Tahoe and elsewhere, I've had to fill up my tires at an earlier period (usually it would be 3-4 months in summer w/ nitrogen, vs winter it was 2-3 months). This is just my experience excluding any science ^_^.

My setup, 205/40/17 Falkens~ 45psi nitrogen..

Kioshi - I wouldn't take that as an argument.

Real-world experience is worth more than science in this kind of discussion, since the real world brings in factors that the lab cannot allow for. Even the use of higher pressures looks silly in the lab, but def feels like it's better on the road.

Either way - each to his/her own. I guess I'll have to try nitrogen now.

gid · 01-26-2009, 04:01 PM

how about helium ? Or nitrous oxide ? Take a hit off the valve stems

.

SailDesign · 01-26-2009, 04:20 PM

Quote:

Originally Posted by gid

how about helium ? Or nitrous oxide ? Take a hit off the valve stems

.

Helium is such a tiny atom that it would actually escape faster, and flat your tires quicker.

gid · 01-26-2009, 04:24 PM

up , up and away , in my beautiful ...... . Get a physical or emotional high or both .

gid · 01-26-2009, 04:42 PM

is it a bird ? A plane ? Why no , it's SUPER YARIS !!!

Thanks to helium filled tires .

01-25-2009, 01:23 PM	#21
gid Drives: '08 Yaris sedan , '08 Liftback Join Date: Oct 2008 Location: Northeast Posts: 643	few years ago we test drove an '06 Scion XB and rode like crap . When hit bumps in the road would almost send yeh through the roof . We were like " what a crappy ride " . So , turned around after traveling a few blocks and went back to dealer where I checked the tire pressure . 45 p.s.i. !!! So , let air out of all tires to around 34 p.s.i. and we went back out for another test drive and what a difference . Much more smoother and not bouncing out of our seats . I try to remember to check air pressure in all new / used cars before a test drive . Can be misleading and give misconception of the ride and handling . Many dealerships don't prep cars all that well . We did get an '06 automatic Scion XB , but at another TOYO dealer that's on the other side of town . Last edited by gid; 01-25-2009 at 01:41 PM.

01-26-2009, 05:28 AM	#28
SilverBack Joey View User's Garage Drives: '14 Scion xD 5-speed Join Date: Oct 2008 Location: El Monte, Ca Posts: 3,529	Over-inflating reduces your grip on the road. Mine was understeering after I filled the front tires at the gas station because the air looked kinda low, so I let some out to bring it back to the way it is after I got home. Off-topic (kinda): If you want your tires to hold its' air all-year-round, fill them with nitrogen inside of oxygen. Oxygen has moisture in it, so it'll expand and contract with seasonal temperature changes. This makes your tires under-inflated on cold days, and over-inflated on hot days. Nitrogen is bone-dry, so it won't do anything inside your tires __________________ Formerly owned Met-Met. '07 Yaris LB 5-speed. A forum post should be like a skirt: Long enough to cover the subject but short enough to keep things interesting. "I don't have an anger problem. I have an idiot problem." -Hank Hill

01-26-2009, 12:19 PM	#30
MUSKOKA800 Drives: Scion FRS RS2, ‘21 Crosstrek Join Date: Oct 2008 Location: Chatham, Ontario, Canada Posts: 1,729	I ran at 42# in my sedan for many thousands of kilometres. Put them down to 32 before winter. Removed them all together after on taste of ice (Goodyear LS). __________________ TRD Upgrades: 18" Wheels wrapped in 215/35/18 PZero's, Sportivo Shocks/Struts, Lowering Springs, Swaybar, Axle-Back Exhaust, Oil Cap, Rad Cap, Signage. Aftermarket Goodies: Piggies SS, K&N Drop-In, Blitz S/C, DC Header, NST Pulley) Toyota Options/Accessories: Sport Pedal Covers, Sport Shift Knob, Ipod Interface, Summer Mats, Winter Mats, Cruise Control, Auto-Dim Mirror, Echo steelies with winter boots.

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01-25-2009, 08:35 AM	#19
NJBob View User's Garage Drives: 2008 Yaris Liftback Join Date: Oct 2008 Location: South Jersey Posts: 444	I have mine at 40 but I don't know that it makes that much difference. The door recommendations are more for comfort. Acceleration and grip is negligible on a whopping 106 hp 4 banger. Bottom line.....unless you're a "better mileage" freak/hyper miler it doesn't really matter.

01-25-2009, 10:46 AM	#20
SailDesign Drives: . Join Date: Feb 2007 Location: . Posts: 1,931	Bob, When you have to cross a 2-mile bridge, high enough to get even an aircraft carrier under, every day in whatever weather is thrown around that day, believe me - you will notice the difference between "standard" pressure 60-series tires and high-pressure 45-series tires. In a 50-mph cross-wind the stock tires and pressure felt plain unsafe. The high-pressure lower profile tires feel fine, and I do not get bump-steer or white-lining at 42 psi except under hard braking. And my braking distance is soooo much shorter with the better compound that it more than makes up for the aspect ratio of the patch.

01-25-2009, 06:06 PM	#23
MadMax Drives: 2008 Yaris Liftback (Sprocket) Join Date: Oct 2008 Location: San Antonio, Texas! Posts: 2,799	gid I usually find dealer's *underinflate* tires on cars to make them ride smoother during test drives. I just pumped my tires up to 40 PSI, the ride is a little harsher but not that bad; and based on our drive home from Buda yesterday, the gas mileage has increased a little (we took back roads so our speed was more reasonable versus going down IH-35). I just refueled but got 75 miles out of the first "bar" of gas, which is pretty good. I am going to go easy and keep it to 70 MPH and below, and see how much that and my increased tire pressure helps my gas mileage. Cheers! M2

01-26-2009, 01:15 AM	#24
gid Drives: '08 Yaris sedan , '08 Liftback Join Date: Oct 2008 Location: Northeast Posts: 643	I just got 68 miles before losing 1st bar with tires at 34 . Gotta consider it's very cold here . Temps have been averaging 15 degrees .

01-26-2009, 01:18 AM	#25
gid Drives: '08 Yaris sedan , '08 Liftback Join Date: Oct 2008 Location: Northeast Posts: 643	when they ship new cars they inflate tires up to 45 p.s.i.. Figure due to the the vehicles sitting around for period of time and in case have a leaky tire(s) . .

01-26-2009, 03:40 AM	#27
yaris-me Learn to Relax Drives: 2007, Meteorite, LB Join Date: Dec 2008 Location: Anaheim, CA Posts: 2,070	So if we split the difference, 37 would be a good tire pressure?

01-26-2009, 12:35 PM	#31
Kioshi Heart Up! Vitz Drives: トヨタ Vitz Join Date: Jun 2007 Location: Fremont, CA Posts: 2,582	I dont want to debate or make it seem like an argument SailDesign, cause your a kool person w/ info and suggestions. I've been using nitrogen since Jan 2008. During warm weather I've noticed that my tires dont loose air as much, as i check my tire pressure every 4 weeks or so. Now during winter Nov-Dec, driving to Tahoe and elsewhere, I've had to fill up my tires at an earlier period (usually it would be 3-4 months in summer w/ nitrogen, vs winter it was 2-3 months). This is just my experience excluding any science ^_^. My setup, 205/40/17 Falkens~ 45psi nitrogen..

01-26-2009, 04:01 PM	#33
gid Drives: '08 Yaris sedan , '08 Liftback Join Date: Oct 2008 Location: Northeast Posts: 643	how about helium ? Or nitrous oxide ? Take a hit off the valve stems .

01-26-2009, 04:24 PM	#35
gid Drives: '08 Yaris sedan , '08 Liftback Join Date: Oct 2008 Location: Northeast Posts: 643	up , up and away , in my beautiful ...... . Get a physical or emotional high or both .

01-26-2009, 04:42 PM	#36
gid Drives: '08 Yaris sedan , '08 Liftback Join Date: Oct 2008 Location: Northeast Posts: 643	is it a bird ? A plane ? Why no , it's SUPER YARIS !!! Thanks to helium filled tires .