Mikegpr03

Guys what PSI are you running on the 18' stock wheels? I saw the recomended pressure and they seem a bit high. Any insight to this would be very welcomed.
Thanks

gthal

Not that I have a lot of time with the car but I'm running 38 cold. The recommended tire pressure is WAY too high to maintain any level of comfort and would likely cause tire wear in the centre of the tire IMO. When I picked up the car, the dealer had the tires set to 42 and I lowered it.

SonnyakaPig

When it's just me in the car or with one other passenger I like the tires to be 39psi all around or 38 (fronts) 40 (rear). Somewhere in that range.

So, if it starts off at like 36-38 psi cold, I'm comfortable.

bluejae

Cold
37 fronts
35 rears

Mikegpr03

I think I'm gonna go with 37 all around since right now they seem a bit high 41 front 44 rears. Why would they recommend such a high tire psi?

venchka

What are the numbers on the gas filler door flap for light and maximum loads? Somewhere in that range should be right for you. As always, YMMV.

Wayne

Mort

I am running mine at 39 cold front and rear. They are still pretty hard at that pressure and don't like rough pavement much. Higher pressures are for higher loads.

Mikegpr03

I think tat is for when the car is loaded with cargo or people. I'm not sure tho..
I would like to be educated about these cars having such high psi from the factory.

ATL_MB

The tire pressures are that high because the factory has to assume some knucklehead is going to get in his cold car, crank it up, and immediately merge onto the autobahn.

I run relatively high pressures (38-40 cold), but you can run lower, esp. if you don't push the car very hard. As the tires warm up, the pressures will rise. Of course, by how much depends on how you drive and the weather. When warm, I think that 36-40 is fine. That might be 32-36 cold. As they say, your results will vary. And with the lower pressures, your tires and wheels are more likely to be damaged by potholes, etc.

venchka

Re-read my original post. Then go read the information on the gas filler door. There is a chart with two columns. The first column is for light loads indicated by pictures of 2 people and 1 or two pieces of luggage. The other column is for the maximum load of the car and shows pictures for the total passenger count and several suitcases. There are entries on the table for front and rear tires, light and maximum loads.

My vehicle was delivered recently with 40+ psi in the tires. I discovered this the morning after when the tires were cold. I set the tires to the minimum shown on the gas filler door chart, 33 psi all around, + 2 psi to allow for widely varying winter temperatures. So far, we have not gone below the minimum.
Every car+wheel+tire combination is slightly different. That is why auto makers place the information where you see it most often. My wife knows where to look.

Wayne

Pickles

IMHO, 33/35 PSI is too low.
Don't forget we're running 18" wheels with low profile tyres....and the less pressure you run, the more "give" there is in the sidewall of your tyre.....so if you hit a pot-hole, or a rock etc, if your tyre wall compresses more because of lower pressure, you are more likely to suffer tyre & rim damage. Unfortunately,I have learned this by experince.
I wouldn't be going under 38 PSI cold.
Cheers, Pickles.

venchka

Am I speaking in tongues???????????????????????

My example was just that. An example of what I do with different wheels & tires. The principle is the same. Go by the information supplied FOR YOUR CAR, WHEELS & TIRES.

Wake up people.

Wayne

Mikegpr03

Well I'm at 37 on all 4 and the car feels much better than 41front and 44 rears. I just put on Invo's from Nitto and they are great, very quiet tires and boy they do bite into a corner. I was taking an on ramp ( in Mexico ) and my car just stuck very very wheel and I really pushed the tires.

Just FYI from a very picky driver this tire sure feels pretty sweet.

I am Jeff

I'm using 39/41 cold

nkc

what are the default cold pressure for 19inch wheels, for cars that come with 19 from factory?

OCJeff

I don't mean to thread-jack, but I often get the "Correct Tire Pressure" message. I'm not sure if that means the TPMS is showing an error (low tire pressure), or if it just means confirm tire pressure is good, and reset the TPMS baseline.

Bummed I have an '09, and no tire pressure display on the console.

Mort

That message means the tire inflation pressure is too low in at least one tire.
or
The tire inflation pressure values of the individual tires differ from each other significantly.

Check and correct tire inflation pressure as required.

Restart the Advanced TMPS.

Page 278 in MY 2010 Owner Manual.

Karl901

I run dealer filled nitrogen 40psi all around.

OCJeff

Okay, so now I'm a little concerned about this. I had the dealer check out this message, and on the paperwork it reports that tire pressure was low and they filled the tires and reset the TPMS system.

Now today (5 days after I got the car back), again I got the "Correct Tire Pressure" notification after a short (10 mile) drive (no more than 100 miles since I get it back). I checked tire pressure, and it seems normal (if not high):

Front: 38.5, 39.0
Rear: 42, 41

I can't think of why this sensor would be triggering. I do know that I added the backup camera via DIY style, but I had specifically used a CCD camera (Kenwood CCD-2000) since I had read there is no chance of interference.

Any others have this issue?

Mort

Your pressures don't look out of line to me but I am not sure how sensitive the TPMS sensors are. Try resetting the TPMS and see if it will hold.

Not sure about interference from your BU camera but if you continue to get TPMS messages turn it off and see if that fixes the problem.

I have heard of others saying they need to reset the TPMS once in a while and that sometimes it takes a few resets to get it to hold.

OCJeff

Thanks -- I'll look for the message next time I'm on cold tires. I read where someone experienced this issue, and reset readings when cold, and then once the tires warmed up, got the message again. After resetting again (on warm tires) he reported it went away for a long time.

Let's see...

OCJeff

Well... I thought I had this beat, and then got sucker punched!

I had reset the TPMS settings every time I saw the warning message "Correct Tire Pressure" (about 4 times in one day). And then everything seemed good for about 2 days.

Then I got this message (see image). So luckily I was pulling into a gas station (a common occurrence in the C63).

Tire pressures:

Front: 37.5/38
Rear: 40/39.5

Everything seems normal, but this new alert has me concerned there is an issue with the TPMS. I'll have to do a dealer drop off next week. I only have 30 days of warranty remaining before CPO kicks in. I wonder the TPMS is covered (would this be classified as a "sensor" in the CPO coverage under Electrical?).

OCJeff

Just to give an update on my issue regarding "Correct Tire Pressure" and then the sudden red dash warning and tire pressure icon on the dash board.

I brought the car into the dealer with the red dashboard indicator lit up (happened twice in 3 days, and never before that, only the "Correct Tire Pressure" previously). They took the car in, and checked all the sensors, and then looked at the car's programming. They found that there was no low tire pressure threshold values programmed. So they plugged in some values (they said) and drive my car 10 miles ()) and did not get the warning.

I've had the car back now for 4 days and it's been fine so far, no warning of any sort related to the tire pressure.

So far so good!

Mikegpr03

Good to hear that you got it sorted out. What PSI are you running and what part of the country are you in? Here in hot as hell Miami I'm finding that 38-39 cold is where the happy medium is at.