Tire pressure monitoring system

[Midnightsun]

The recommended pressure on the V8 is 33 front and 35 rear.

Either you are wrong or the V8 AWD is different as my door jamb says 35 all around.

 

[Midnightsun]

My TPMS sensors are about 2 psi optimistic. A very accurate digital and old-stock Milton both say 35, the TPMS says 37.

No gauge is accurate unless it is calibrated. Digital does not mean accurate nor does brand name or price paid. I have worked in hydraulics my entire life and can tell you a $20 gauge can be as accurate as a $200 gauge. I am fortunate to have the resources to test my stuff and I know my gauge is accurate. Sure there are much more precise calibration instruments out there but this is more than sufficient for our use. http://www.fluke.com/fluke/caen/pro...pressure-calibrators/fluke-700g.htm?pid=73941. The industry standard for TPMS accuracy is 1psi.

 

[jarred52]

How can the pressure in a spare tire in the truck that is fitted with a TPMS be expected to be shown in the car's indicator system when the system is only equipped to show the 4 tires on the car?

I inflate my full-size spare to 40 psi then check and re-pressure every 3-4 months. Yes, I carry a pressure gauge and a mini compressor in my tool kit that I keep in the car so I can inflate or deflate the spare to the proper pressure if the need arises.

Just a note; a matching wheel and correct size tire will fit in place of the donut in the spare's space after removal of the plastic tool holder. I wrap the tools, including an "X" lug wrench, in an old towel to prevent rattles and use for clean-up. This will leave a shallow indention when the matt is replaced so I cut a piece to plywood to place under the matt. The wood can also then be used to provide a firm base for the jack. The used wheel cost $200 from Ebay and the new generic tire $90 from Discount Tire. Total cost - $300; piece of mind - priceless.

 

[ksoze]

Either you are wrong or the V8 AWD is different as my door jamb says 35 all around.

U.S. cars do not have an AWD V8, hence the tire difference. Your AWD V8 up north probably has the same all weather size on all four wheels.

 

[Midnightsun]

U.S. cars do not have an AWD V8, hence the tire difference. Your AWD V8 up north probably has the same all weather size on all four wheels.

No we are exactly the same wheels and tires as in the US on the V8. 19" staggered.

 

[ksoze]

No we are exactly the same wheels and tires as in the US on the V8. 19" staggered.

You may want to look at your door jamb again then. If they are staggered, wouldn't it make logical sense the recommended PSI would be also?

 

[ksoze]

Everyone was right. Even though the tires are the same size on V8's, according to the 2015 manual, the 2WD V8 has a recommended 33/35 for F/R. The AWD V8 with the same tires recommends 35/35 for F/R. (Manual reference 8-4, page 484).

 

[greekgeek]

How can the pressure in a spare tire in the truck that is fitted with a TPMS be expected to be shown in the car's indicator system when the system is only equipped to show the 4 tires on the car?

I inflate my full-size spare to 40 psi then check and re-pressure every 3-4 months. Yes, I carry a pressure gauge and a mini compressor in my tool kit that I keep in the car so I can inflate or deflate the spare to the proper pressure if the need arises.

Just a note; a matching wheel and correct size tire will fit in place of the donut in the spare's space after removal of the plastic tool holder. I wrap the tools, including an "X" lug wrench, in an old towel to prevent rattles and use for clean-up. This will leave a shallow indention when the matt is replaced so I cut a piece to plywood to place under the matt. The wood can also then be used to provide a firm base for the jack. The used wheel cost $200 from Ebay and the new generic tire $90 from Discount Tire. Total cost - $300; piece of mind - priceless.

Great idea, I also put in a full size spare. I thought it might pick up the tpms in the trunk because my wife's Lexus rx350 has tpms for her full size spare that is continuously monitored. Also there is plenty of space on the screen for it to appear. Anyhow not a big deal. I trimmed the bottom and sides of the foam tool holder so now it fits well within the OEM rim.

 

[Man of Mystery]

Everyone was right. Even though the tires are the same size on V8's, according to the 2015 manual, the 2WD V8 has a recommended 33/35 for F/R. The AWD V8 with the same tires recommends 35/35 for F/R. (Manual reference 8-4, page 484).

The higher tire pressure for the front tires in the AWD system is probably due to the extra weight of the front components of the AWD system.

 

[Midnightsun]

The higher tire pressure for the front tires in the AWD system is probably due to the extra weight of the front components of the AWD system.

I doubt it because it is advertised at 66lbs. Check and see if the RWD V6 and AWD V6 have the same recommended tire pressures to confirm. We do not have any Genesis available to us that is not AWD here in Canada.

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[ksoze]

Check and see if the RWD V6 and AWD V6 have the same recommended tire pressures to confirm.

Both 2WD and AWD V6 models recommend the same pressure for F&R - 33.

 

[Midnightsun]

Both 2WD and AWD V6 models recommend the same pressure for F&R - 33.

Hmmm, strange to say the least. I double confirm the door jamb says 35psi all around for the V8 AWD. Something is not consistent.

 

[lobsenza]

The RWD V8 models have 33 front, 35 rear.

 

[ksoze]

The RWD V8 models have 33 front, 35 rear.

Which was stated numerous times a few posts above.....

 

[C-130Geek]

Is the LF at 34.9 by desire vs. the 35.0 on the RF?
Also, why set the rears higher?

Nothing so cerebral as Nikgen suggests, just me being to lazy to go back and add .1 psi. Can not guarantee gauge is accurate to less than 1/2 psi though believe it is, electronic strain gauge self calibrates each time turned on. I am VERY confident in consistency of reading. I have had tires swapped but the Conti's are the same size as the Hankooks (245/40R19 front and 275/35R19 rears). My door plate recommends 33 psi front and 35 psi rear. I inflate +2 because I drive mostly higher speeds and distances. Little in town. BTW my front rims are 9.5 inches wide and rears are 10 inch. Fronts have an "F" cast in rim and rears have a lower case "r" to ensure proper positioning.

 

[nickpike]

Nothing so cerebral as Nikgen suggests, just me being to lazy to go back and add .1 psi. Can not guarantee gauge is accurate to less than 1/2 psi though believe it is, electronic strain gauge self calibrates each time turned on. I am VERY confident in consistency of reading. I have had tires swapped but the Conti's are the same size as the Hankooks (245/40R19 front and 275/35R19 rears). My door plate recommends 33 psi front and 35 psi rear. I inflate +2 because I drive mostly higher speeds and distances. Little in town. BTW my front rims are 9.5 inches wide and rears are 10 inch. Fronts have an "F" cast in rim and rears have a lower case "r" to ensure proper positioning.

Exactly the same info for my 3.8L here in the UK. Also, nice to see that my supposedly accurate hand held electronic tyre gauge gives exactly the same readings as the mode screen values in the car. I added 3 psi to stop the edges scuffing when set as recommended that prematurely kills the tyres when there is still 4mm of tread across the tyre face.