| SlickMDX |
| I know Tires PSI levels have been discussed before but I have a issue with my new tires. I recently upgraded my wheels to 19inchs with Bigger Tires. The PSI level the dealer set is 38. My previous setting from the factory was 32. Is the PSI level Higher because the wheel is bigger. I did expect to have a rougher ride with the bigger wheels but my current ride is really rough and bouncy. Thoughts anyone? |
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| bronxblaza117 |
| read the sidewall on the tires. they should have the max cold air inflation written there.u can go 2-4 psi under the max thats stated there to get a better ride, however ur mileage may decrease, not too much though |
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| bronxblaza117 |
| oh can you take some pics of those wheels please!!!! :D |
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| SlickMDX |
Will add pics tonight.
Back to my original point, does anyone know if one needs to increase PSI if the wheel is bigger? |
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| LionSpeed |
quote:
Originally posted by SlickMDX
I know Tires PSI levels have been discussed before but I have a issue with my new tires. I recently upgraded my wheels to 19inchs with Bigger Tires. The PSI level the dealer set is 38. My previous setting from the factory was 32. Is the PSI level Higher because the wheel is bigger. I did expect to have a rougher ride with the bigger wheels but my current ride is really rough and bouncy. Thoughts anyone?
I have sport mich 18". Spec says 32, but dealer inflated 38, yield to 41-42 driving on hot day. I was fighting with 32 or 37 psi for a good month. Thought 37 was good at the time but slowly realized 32 is just simply better. Stick with manufacture recommended 32psi. Same law should apply for 19".
By the way, I was thinking of getting 19" rims fr Acura too, but don't want to sacrifice the smooth ride. |
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| bronxblaza117 |
mmmhh ok, the max PSI recommended from the manufacterer is printed on every tire( which is specific for wheel sizes). it is located on the side wall. going above the PSI recommended will provide a harsher ride like you are expierencing. going 2-4 psi lower will provide a smoother ride. usually most tired are set at 32psi. try 32psi, it will be a big difference from 38psi.
:roadtrip: |
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| bronxblaza117 |
| why would you run higher then spec? just out of curiosity. i know it will lead to higher mileage, but a bumpier ride |
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| bronxblaza117 |
oh ok.
so if your in the mood for doing some "Fast and the Furious" moves or want to get 1-2 more miles per gallon then use higher psi.
for a smoother ride, which also gives you 1-2 less miles per gallon then use SPEC or 1-2 less PSI.
however if spec is 32psi i would not recommend something as high as 38. The reason it comes from the dealer that high is that they try to break in the tire, but the dealer is SUPPOSED to set the psi back to spec max, but a lot of the time they forget |
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| bronxblaza117 |
| ok, all i am saying is for him to go out to his car, read the sidewall of the tire so that he knows specifically what is the PSI for his tire. i see that u said you found that on the Acura sight but for all i know that can be a typo.from there he can choose to go ~1-3PSI to either go up in PSI or down!!! |
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| shootist |
Those are all really interesting arguments, but the factory recommended setting for 19 inch (Acura calls them "inch overs") is 35 psi.
Acura dealers have all been given a very accurate reference tire gauge. It is possible (or even likely) that your gauge is not as accurate as the Acura reference gauge. However, if some grease monkey picked up a stick gauge from where he dropped it a few times, he may have applied an inappropriate pressure.
Get an accurate tire gauge. (Google is your friend). |
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| bronxblaza117 |
badbrad chill out
i guess i dont it, you are telling him to listen to the website, and im telling him to read the ACTUAL TIRE to get the appropriate PSI.
am i missing something?
all the extra stuff i said was just some suggestion i was telling him to get a better ride, so i dont see how an opinion of mine can be wrong or right. |
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| highcountrymdx |
Another plus for operating custom wheel/tire combos are a higher inflation setting, is to protect the rims when encountering pot holes, curbs, etc. By going to a larger size, handling and economy take a back seat to the prime mover of looks. And nothing looks worse than a set of $4000 wheels bent from the rigors of the daily drive. Best way to protect the rims is with higher inflation pressures.
Of course, suspension longevity and compliance take a hit. So too rollover resistance, braking performance, etc. But, heck, you've got smokin' wheels! |
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| LionSpeed |
| IMO, another good way is to test both 32 & 38 on both highway & city in the same condition & temperature if possible. Ultimately, you have to decide which setting is best regardless. On the same token, sticking with manufacturer recommendations is best bet. If it says 32psi, then it should be at 32. The number didn't just come out of no where but rather a chain of testings and passing inspections. I don't see why you would want to change to any other way. |
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| bronxblaza117 |
| ^:claphead: |
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| highcountrymdx |
Let's face it, change from the manufacture's recommendation, whether wheel/tire combo, or tire pressures, is like jumping into a pool, blind folded, on a hot day. You have no idea where you're going, but you hope the plunge will be worth it.
Look at it like being a test pilot. |
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| SlickMDX |
quote:
Originally posted by BADBRAD
I would run higher then stock. I run 36 psi on my 20's! According to the 19 inch Acura accessory wheel instructions you should be running yours at 35 psi if used with a 275/45/19 Tire!
https://hondacuraworld.hostasaurus....07mdxwheels.pdf
Here's a link to tire rack tech page for more info:
http://www.tirerack.com/tires/tiret...ge.jsp?techid=1
OK I set the tire to 32 PSI and the ride is awseme!. I did that before reading all these posts. I will set it to 35 and see what happens. Bt guys will going down 3 Psi from 35 to 32 make that much of a difference. |
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| rics70 |
I have mine inflated at 30psi, it gives the best compromise between good grip, and no bouncy ride.
Have a good day! :2: |
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| TulsaMDX |
quote:
Originally posted by BADBRAD
Tire rack tech page
"higher inflation pressures reduce rolling resistance slightly and typically provide a slight improvement in steering response and cornering stability. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures."
Actually, the reason you increase your tire pressure at track events is to prevent the tire from rolling off the wheel during cornering. I guess in a very vague way that is what they are trying to say.
I run 30 lbs. cold in the tires on the MDX and my Corvette. Works out to about 35 lbs. hot. I believe this is what most tire manufactuer's recommend. |
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