Tire Pressure - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums

dgh1981 · 09-06-2010, 08:43 AM

Has anyone upped the tire pressure in their new CR-Z? I see my max sidewall pressure is 50 PSI. My Civic Hybrid was 44 and I would inflate to around 40. I was thinking of putting it up to 40 to test first.

SunCat · 09-09-2010, 01:47 PM

I've upped mine to about 38 PSI, and it hasn't resulted in that harsh of a ride. I don't really know how that has affected the gas mileage as I did it right away (the dealer had them down to 28 which is way too low in my opinion).

logical.roger · 09-09-2010, 02:27 PM

I don't have a CRz yet, but on my hybrid the tires have a max of 44 and I run 44 in the front and 42 in back without any problem. it greatly improves the MPG, +10%.

Logical

dgh1981 · 09-09-2010, 02:51 PM

Quote:

Originally Posted by logical.roger

I don't have a CRz yet, but on my hybrid the tires have a max of 44 and I run 44 in the front and 42 in back without any problem. it greatly improves the MPG, +10%.

Logical

Do you fill it when the tires are cold or warm? I worry about filling to max pressure that's why I always put a little less in.

SunCat · 09-09-2010, 03:16 PM

I try to fill them when the tires are cold (I have an air compressor in the garage, so it's fairly easy to do on the weekends). I have read that the general "high" recommendation is at about 10% less than the tire manufacturer's max PSI. The rating on the tire is based on filling them cold, so you don't really need to worry about overinflating if you do end up checking them warm (they will actually end up being a lower PSI once the tires cool down).

logical.roger · 09-09-2010, 03:32 PM

i always fill them cold.

swat49833 · 10-12-2010, 09:52 AM

I too will be adding air. This is the first time I had tires with nitro in them. I did find out that it is no prob to add a little air to the nitro. I will be going to 42 or 45 cold. Been driving at 30-34 psi. will see if it helps any on the gas mileage and see how the ride changes.

forumonlooker · 10-12-2010, 10:31 AM

What basis are you guys adding air in for? The recommended psi is based on weight of vehicle +driver/gas for maximum handling and efficiency. Adding air makes the tire rounder so that there is less of a contact patch on the ground, yes but in turn causes the tire to wear unevenly (more in the middle than the outside), and reduces normal every day handling. Its not until you get into full body roll that you would see any handling improvements from an increased psi, and that is usually only done to the front within 5 psi.

GoHuskies · 10-12-2010, 10:46 AM

Less road grip also means less friction and thus more fuel savings. It's up to each driver on how they want to balance fuel economy vs comfort.

As for tire wear the stock tires on my Civic saw 45+ psi and the tires lasted 60,000 miles. Of course I was also not treating them the right way, I did my own oil changes so I had the tires rotated once a year if I remembered. I'm not going to go as high with the CR-Z partly because even moving the psi up to 40 I notice rough roads much more than the stock 30 psi.

gomarlins3 · 10-13-2010, 05:07 AM

In the Insight I would add extra air looking for all of the MPG I could get. In this car, I am enjoying the MPG that I am getting, but am enjoying the smoother ride. I will leave them where they are air pressure wise.

10-13-2010, 05:07 AM	#10 (permalink)
gomarlins3 Senior Member Join Date: Sep 2010 Location: Kuna Idaho Posts: 2,050	In the Insight I would add extra air looking for all of the MPG I could get. In this car, I am enjoying the MPG that I am getting, but am enjoying the smoother ride. I will leave them where they are air pressure wise. __________________ Happiness is a nice road, great weather, and driving the S with Sue in the seat next to me.

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09-09-2010, 01:47 PM	#2 (permalink)
SunCat Junior Member Join Date: Jul 2010 Location: Aloha, OR Posts: 23	I've upped mine to about 38 PSI, and it hasn't resulted in that harsh of a ride. I don't really know how that has affected the gas mileage as I did it right away (the dealer had them down to 28 which is way too low in my opinion).

09-09-2010, 02:27 PM	#3 (permalink)
logical.roger Newbie Join Date: Sep 2010 Location: st louis mo Posts: 4	I don't have a CRz yet, but on my hybrid the tires have a max of 44 and I run 44 in the front and 42 in back without any problem. it greatly improves the MPG, +10%. Logical

09-09-2010, 03:16 PM	#5 (permalink)
SunCat Junior Member Join Date: Jul 2010 Location: Aloha, OR Posts: 23	I try to fill them when the tires are cold (I have an air compressor in the garage, so it's fairly easy to do on the weekends). I have read that the general "high" recommendation is at about 10% less than the tire manufacturer's max PSI. The rating on the tire is based on filling them cold, so you don't really need to worry about overinflating if you do end up checking them warm (they will actually end up being a lower PSI once the tires cool down).

09-09-2010, 03:32 PM	#6 (permalink)
logical.roger Newbie Join Date: Sep 2010 Location: st louis mo Posts: 4	i always fill them cold.

10-12-2010, 09:52 AM	#7 (permalink)
swat49833 Member Join Date: Aug 2010 Posts: 122	I too will be adding air. This is the first time I had tires with nitro in them. I did find out that it is no prob to add a little air to the nitro. I will be going to 42 or 45 cold. Been driving at 30-34 psi. will see if it helps any on the gas mileage and see how the ride changes.