What tire pressure are you guys running?

[importengines]

Hi guys,
What tire pressure are you guys running and what improvement did you get from the stock tire pressure? Also, can you run more pressure than 43psi? I'm thiking of running 50psi on my stock Integritys. Thanks.

[efusco]

Originally posted by importengines@Aug 3 2006, 01:36 PM
Hi guys,
What tire pressure are you guys running and what improvement did you get from the stock tire pressure? Also, can you run more pressure than 43psi? I'm thiking of running 50psi on my stock Integritys.  Thanks.

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Some HiHys come with Michelin Energy tires max rated to 35psi...so that's what we've been running.

With Integrities, for everyday driving, I would not go over 44psi. The danger/risk to benefit ratio just isn't there. Could you live with yourself if you had a blow-out when the pressure was @ 50psi and killed someone?

Plus, even at 35psi with higher rolling resistance tires than the Integrities we're getting about 28mpg lifetime in our 4WD HiHy limited...and my wife is primary driver and doesn't strive for high mpg like I do. B)

[elkeye]

Originally posted by efusco@Aug 3 2006, 02:52 PM
Some HiHys come with Michelin Energy tires max rated to 35psi...so that's what we've been running. 

With Integrities, for everyday driving, I would not go over 44psi.  The danger/risk to benefit ratio just isn't there.  Could you live with yourself if you had a blow-out when the pressure was @ 50psi and killed someone? 

Plus, even at 35psi with higher rolling resistance tires than the Integrities we're getting about 28mpg lifetime in our 4WD HiHy limited...and my wife is primary driver and doesn't strive for high mpg like I do. B)

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Our Goodyear Interity tires were taken off day one!

Ran a set of four (4) Dunlop SJ6 tires in the winter and switched to a set of four (4) Goodyear Fortera Triple-Tred once they were available in 225/65HR17.

Have been running the Goodyear Fortera Triple-Tred tires at 35psi (even though they are max rated at 44 psi).

Even with higher rolling resistance tires than either OEM tires (Goodyear Integrity or Michelin Energy LX4 tires) we are getting about 28 mpg on our 4wd-i HiHy Limited.

Forget about an all-season OEM car/mini-van tire and give me the performance of a winter SUV tire (Dunlop SJ6) or the wet/dry performance of an all-season SUV tire (Goodyear Fortera TripleTred) during the spring/summer/fall.

[importengines]

Originally posted by elkeye@Aug 3 2006, 05:11 PM
Our Goodyear Interity tires were taken off day one!

Ran a set of four (4) Dunlop SJ6 tires in the winter and switched to a set of four (4) Goodyear Fortera Triple-Tred once they were available in 225/65HR17.

Have been running the Goodyear Fortera Triple-Tred tires at 35psi (even though they are max rated at 44 psi).

Even with higher rolling resistance tires than either OEM tires (Goodyear Integrity or Michelin Energy LX4 tires) we are getting about 28 mpg on our 4wd-i HiHy Limited.

Forget about an all-season OEM car/mini-van tire and give me the performance of a winter SUV tire (Dunlop SJ6) or the wet/dry performance of an all-season SUV tire (Goodyear Fortera TripleTred) during the spring/summer/fall.

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[importengines]

Originally posted by importengines@Aug 5 2006, 01:54 AM

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HI guys,
Thanks for your replies regarding this topic.

Today, I bumped up my tire pressure(Integritys) from 43 psi to 50 psi cold all the way around and drove 355miles(75%freeway / 25%inland) and averaged 32.7mpg. We drove thru mountains and hills during the travel averaging 31mpg but as soon as I hit the flat areas, the mileage crawled back up to 32-33mpg. I also drove a little bit aggressive because people(in Los Angeles) were tailgating me. I stayed on the posted limit inlands and average around 70mph in the freeway. Before this, I average between 29-30mpg combined but no mountains or hills in my route. I will keep it at 50 psi for the next 3 tanks and report back. NOTE: I don't recommend to anybody to over inflate their tires this much because of the risks involve(just like efusco mentioned). I will not be responsible. I'm doing this for myself to see if there is any mileage benefit. Thanks.

[importengines]

Originally posted by importengines@Aug 5 2006, 02:17 AM
HI guys,
Thanks for your replies regarding this topic.

Today, I bumped up my tire pressure(Integritys) from 43 psi to 50 psi cold all the way around and drove 355miles(75%freeway / 25%inland) and averaged 32.7mpg. We drove thru mountains and hills during the travel averaging 31mpg but as soon as I hit the flat areas, the mileage crawled back up to 32-33mpg. I also drove a little bit aggressive because people(in Los Angeles) were tailgating me. I stayed on the posted limit inlands and average around 70mph in the freeway. Before this, I average between 29-30mpg combined but no mountains or hills in my route. I will keep it at 50 psi for the next 3 tanks and report back. NOTE: I don't recommend to anybody to over inflate their tires this much because of the risks involve(just like efusco mentioned). I will not be responsible. I'm doing this for myself to see if there is any mileage benefit. Thanks.

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Just want to report back on my findings. Made 3 fill ups so far after bumping my tire pressure to 50psi from 43psi. Going thru the mountains(same route) approx 250 miles have always netted me to 27-28mpg before. Now I get 31 -31+ average. I will be bringing down the tire pressure to 43psi just to confirm my mpg gains.
So far no abnormal signs on all 4 tires. I'll be getting my alignment soon because I have never done one and don't trust that all cars coming out of the dealer are perfectly aligned. C ya!

[sawbert]

Is uneven tire wear an issue here? A bit difficult to quantify in economic terms, I imagine. I also wonder if there's an effect on the the VDIM system operation with higher pressure. I realize that's probably not a concern for some operators but I'm trying to think of all ramifications of higher tire pressure.

[philmcneal]

if you see how tires are constructed, they are designed in a way that they'll blow up at least 5 to 10 times the posted limit on a tire. If the danger zone was so close to 50 psi, believe me we would see a lot more incidents. And by running his tires hard, heat buildup is a lot less likely because of the reduced friction between the tires, and you know lots of friction equals lots of heat!

With the extra weight of the hybrid system, I wouldn't be surprised if the extra psi makes up for the extra load, since they do recommend upping the pressure as load increases.

There's been many speculation onto if the psi posted on the doors is the rated pressure for all driving conditions, I tend to disagree, as I believe that rated psi on the door is for someone who wants a soft, low load, cushy comforting ride. Not all are willing to increase friction for that sole benefit.

[Mr. Kite]

Originally Posted by efusco

With Integrities, for everyday driving, I would not go over 44psi. The danger/risk to benefit ratio just isn't there. Could you live with yourself if you had a blow-out when the pressure was @ 50psi and killed someone?

I really do not see how that is a logical response. What pressure would your tires have to be prior to the blowout so that you would feel the least guilt? Is there some evidence out there that suggests that there is an increased risk of a blowout at 50psi?