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04-04-2013, 01:54 AM | #17351 |
Scooby Specialist
Member#: 340297
Join Date: Dec 2012
Chapter/Region:
MWSOC
Location: Cincinnati
Vehicle:2013 Impreza 5sp Prm Ice Silver |
So I've been playing with tire pressures and I'm currently running 41/39.5 psi. I'm not sure if this is too high and whether there are any risks to running it this way. I am well aware that the recommended pressure is much lower, something like 32/30, but seriously, screw that, no one listens to that anyway. I feel like the steering is a lot more positive and the car handles much better with the more heavily inflated tires, but at the same time, I'm not sure if this is a good idea or not. Today I checked tire pressure and adjusted as I had been running closer to 44 (my previous gauge was a piece of crap), but overall I feel like the car handles better with more air. Maybe the problem is just the crap tires?
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04-04-2013, 03:34 AM | #17352 | |
Scooby Specialist
Member#: 345877
Join Date: Feb 2013
Chapter/Region:
MAIC
Location: Pittsburgh, PA
Vehicle:2013 Impreza Sport Ice Silver |
Quote:
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04-04-2013, 03:56 AM | #17353 |
Scooby Newbie
Member#: 102684
Join Date: Dec 2005
Location: Nashville, TN
Vehicle:2013 Impreza Deep Cherry |
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04-04-2013, 03:58 AM | #17354 |
Scooby Newbie
Member#: 102684
Join Date: Dec 2005
Location: Nashville, TN
Vehicle:2013 Impreza Deep Cherry |
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04-04-2013, 06:01 AM | #17355 | |
Scooby Newbie
Member#: 338666
Join Date: Nov 2012
Chapter/Region:
MWSOC
Location: Northeast Ohio
Vehicle:2022 Crosstrek Ltd. Magnetite Gray |
Quote:
Note that over inflation may help with mpg's due to reduced friction against the road though, but you're wearing out the middle before the edges. John edit: I might also add that an alignment issue would result in unequal readings. Simply stated, friction = heat. Last edited by Guzzi 1; 04-04-2013 at 06:52 AM. Reason: added info |
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04-04-2013, 06:34 AM | #17356 | |
Scooby Guru
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
Quote:
Higher isn't always better. |
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04-04-2013, 07:27 AM | #17357 |
Scooby Specialist
Member#: 89967
Join Date: Jun 2005
Chapter/Region:
NESIC
Location: MA
Vehicle:2020 Volvo S60 Gray |
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04-04-2013, 10:00 AM | #17358 |
Scooby Specialist
Member#: 340297
Join Date: Dec 2012
Chapter/Region:
MWSOC
Location: Cincinnati
Vehicle:2013 Impreza 5sp Prm Ice Silver |
Better than the front losing grip and understeering into oblivion. I rechecked my pressure after the tires had cooled and it was closer to 40/38.5. Are we supposed to test pressure when the tires are warm or cold?
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04-04-2013, 10:07 AM | #17359 |
Scooby Newbie
Member#: 315759
Join Date: Apr 2012
Location: Osceola, Iowa
Vehicle:2014 WRX Hatch Satin White Pearl |
I run the max psi rating (44 I think) quite regularly. I get better mpgs and the car feels less sloppy. The dealer always sets it to 36/35 and I just head to sheetz for the free air.
I also don't really drive like a madman. I try to baby my little scoob. |
04-04-2013, 10:24 AM | #17360 |
Scooby Specialist
Member#: 323103
Join Date: Jun 2012
Chapter/Region:
MAIC
Location: Columbia MD
Vehicle:2018 WRX Pure der |
Understeer is safer than oversteer. You dont want to spin into oncoming traffic, its better to take collision head on for more cushion.
I keep mine a bit higher then spec around 36-39psi. |
04-04-2013, 10:54 AM | #17361 |
Scooby Specialist
Member#: 340297
Join Date: Dec 2012
Chapter/Region:
MWSOC
Location: Cincinnati
Vehicle:2013 Impreza 5sp Prm Ice Silver |
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04-04-2013, 11:21 AM | #17362 |
Scooby Specialist
Member#: 322264
Join Date: Jun 2012
Chapter/Region:
Tri-State
Location: Webster, NY
Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
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04-04-2013, 11:29 AM | #17363 | |
Scooby Guru
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
Quote:
Run what you want, but I tried the higher pressures last summer and was not impressed, the stock tires loose grip easily and even easier yet when you ramp up the pressure higher than 4psi over stock. I also saw no mpg loss by running them anywhere from 40 down to 34/32. I still think 35/33 or 36/34 is the sweet spot. I generally drive really hard |
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04-04-2013, 11:37 AM | #17364 |
Scooby Specialist
Member#: 323103
Join Date: Jun 2012
Chapter/Region:
MAIC
Location: Columbia MD
Vehicle:2018 WRX Pure der |
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04-04-2013, 12:21 PM | #17365 |
Scooby Specialist
Member#: 340297
Join Date: Dec 2012
Chapter/Region:
MWSOC
Location: Cincinnati
Vehicle:2013 Impreza 5sp Prm Ice Silver |
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04-04-2013, 12:30 PM | #17366 |
Scooby Specialist
Member#: 322264
Join Date: Jun 2012
Chapter/Region:
Tri-State
Location: Webster, NY
Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
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04-04-2013, 12:49 PM | #17367 |
Scooby Specialist
Member#: 323103
Join Date: Jun 2012
Chapter/Region:
MAIC
Location: Columbia MD
Vehicle:2018 WRX Pure der |
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04-04-2013, 01:23 PM | #17368 |
Scooby Specialist
Member#: 345877
Join Date: Feb 2013
Chapter/Region:
MAIC
Location: Pittsburgh, PA
Vehicle:2013 Impreza Sport Ice Silver |
Now, let's just say you run better tires.. The stock Yoko's suck. Can you successfully run a little higher with better ones?
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04-04-2013, 01:36 PM | #17369 |
Scooby Specialist
Member#: 316869
Join Date: Apr 2012
Location: Ontario, Canada
Vehicle:2012 Impreza Sport Dark Gray |
Question for the guys with auto climate control...when you turn on the auto setting, is it supposed to turn on to full blast? No matter what the temperature setting, whenever I turn on auto climate control it turns up to full blast and doesn't lower. Is that normal?
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04-04-2013, 02:19 PM | #17370 | |
Scooby Specialist
Member#: 329526
Join Date: Aug 2012
Chapter/Region:
SWIC
Location: Ground Control
Vehicle:2013 Impreza Spt cvt Silver |
Quote:
Pressure ratings on tires are for sea level and very cold so there is a safety margin - if you pump them up to 44 psi in the cold at low elevation then climb to a high elevation and when warm they could be over 50 psi. E.g. If you go from sea level to 9,000 feet that 44 psi turns to 48 psi. Of course you people on the east coast would have to either drive a long way or take the car up in an airplane... Further then, if you had filled the tires at 30 deg f at sea level then climbed to 9,000 feet and the temperature was 80 deg, you would have 53 psi in them. |
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04-04-2013, 03:45 PM | #17371 | |
Scooby Guru
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:2012 2.0i Sport 5MT DGM |
Quote:
it depends on the tire, load rating, size, etc etc etc. there are too many factors to just say "yes". generally speaking more pressure = less rolling resistance AKA traction. hence if you purely are going for more MPG you increase pressure, but if you are going for traction you drop the pressure. here is a good article i just read and kinda want to try out in a few months when it is warmer http://www.autocross.us/forums/lofiv...x.php?t46.html Last edited by flyboy1100; 04-04-2013 at 03:50 PM. |
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04-04-2013, 03:48 PM | #17372 | |
Scooby Specialist
Member#: 299286
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: Upstate NY
Vehicle:2017 Legacy Limited White |
Quote:
I am such a lemming. |
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04-04-2013, 03:58 PM | #17373 | |
Scooby Specialist
Member#: 322264
Join Date: Jun 2012
Chapter/Region:
Tri-State
Location: Webster, NY
Vehicle:2012 Impreza Sp 5sp Obs Blk Prl/Drk Gray Mtl |
Quote:
Marketing Guy => So the 32/30 PSI we see on the door jam sticker might be the result of that compromise. I generally prefer a firmer ride, so my practice is to inflate 3 lbs higher than the door sticker (35/33 PSI, in the case of our Imprezas with the 17" Yoko tires). |
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04-04-2013, 04:10 PM | #17374 | |
Scooby Specialist
Member#: 209172
Join Date: Apr 2009
Location: Omaha, NE
Vehicle:2012 Impreza CLL BL2 |
Quote:
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04-04-2013, 04:28 PM | #17375 | |
Scooby Specialist
Member#: 299286
Join Date: Oct 2011
Chapter/Region:
NESIC
Location: Upstate NY
Vehicle:2017 Legacy Limited White |
Quote:
Whatever the process is that they use to derive the numbers printed on the door jamb, those are the recommended pressures and what the tires have in them when they test the vehicle for things such as fuel economy, cornering, braking, and stability. You can alter from it one way or the other, but it is you second guessing the tested pressures. Go for it, it is your car, but don't think that making up stories about what you think happened when the tire pressure was determined means anything but that you like to make up stories about it, in the absence of any evidence whatsoever, so you can rationalize your decision to use a different pressure. |
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