So my TPMS went off the other day and I checked all 4 tires. My right rear was down to 32 psi cold while my others were at 38 psi cold.
I put in some air to 38psi warm and the warning light stayed on.
I figured it would need to reset by itself, so I drove away. It didn't reset, so I put a couple more lbs. of pressure in and the warning light turned off right away.
Didn't realize they were that sensitive and was wondering what pressures everyone else kept theirs at. 38 psi cold seems high to me and my manual was a little difficult to read (4 charts with differing measurements), but even 32 psi cold shouldn't set off the sensor.
Any thoughts?

You have to reset it yourself....it won't go away on its own. Just go to the settings and reset it. But if it keeps reoccuring, lets say every 400-500 miles (that was in my case) you probably have a screw or nail in your tire and it slowly lets air out. Had that happened to me, every week or so had to put air in it, always the same tire, finally went to check it out at the dealer and there was a screw in the tire.

So my TPMS went off the other day and I checked all 4 tires. My right rear was down to 32 psi cold while my others were at 38 psi cold.
I put in some air to 38psi warm and the warning light stayed on.
I figured it would need to reset by itself, so I drove away. It didn't reset, so I put a couple more lbs. of pressure in and the warning light turned off right away.
Didn't realize they were that sensitive and was wondering what pressures everyone else kept theirs at. 38 psi cold seems high to me and my manual was a little difficult to read (4 charts with differing measurements), but even 32 psi cold shouldn't set off the sensor.
Any thoughts?

Look at the driver's side door sticker, and it gives you correct pressures for the tires. Mine says 32 front and 38 rear.....

My TPM warning went away by itself after I put air in the tires. However, you are still supposed to go in and reset it anyway as I understand it. :shifty

Well, I have an early production E90 330i and also live in Vegas.

Anyhow, the manual states correct tire pressures for a full load of passengers or only 2 passengers for speeds up to 100mph or speeds exceeding 100mph.

I have tinkered with my tire pressures, changing them from the 38/45 recommended for full load and speeds exceeding 100mph, to the 33/38 (i think) that is recommended for 2 passengers and speeds under 100.

I've tried a few areas in between as well. I found that 38/45 the car slid around too much. With 33/38 or whatever it was the car exhibited too much understeer. I'm a hard driver. I take a lot of corners at 9/10ths and in doing so had to use a lot of throttle to get the car to rotate properly with the lower pressures.

The other day I went with 35/45 which is virtually perfect. My favorite test for handling is getting onto I15 South from MLK. I turn DTC on and put the car in second gear.

I used to have trouble transitioning into the turn as I'd have to use too much throttle to rotate it, which would invict the DSC and the inevitable SNAP back into position.. I could enter the turn about 4000 rpm and make a smooth drift to the exit but again, another over rotation and SNAP.

With the new pressure, I can enter the turn at 5000 RPM and the transitions are flawless. Even my wife gets a kick out of it now. I no longer have to turn DTC on to break the rear loose in order to counter all that understeer.

I don't know what the recommended pressures are for your car, but I have the sport package with Bridgestone RE050A RFT's on 18" factory rims.

Adding pressure in the rear will reduce understeer, reducing pressure will increase understeer. The opposite is true for the front tires.

In my wife's 2005 JCW mini there is so much understeer that tire pressure didn't change much, but in the 330i it is so well balanced that small changes are quite noticeable. Dial it in for your level of confidence and driving style.

Not that it really matters, but you didn't turn DTC on, you turned DSC off which left you with only DTC. If you want to drift with no electronic intervention, hold the button down longer and you will turn off DTC and you will be on your own. You should be able to brake the rear tires loose and steer with the accelerator.

DTC is a mode within the DSC system. DTC stands for Dynamic Traction Control. This setting allows for mild to moderate wheelspin at the rear tires, enabling you to accelerate on icy roads or up icy inclines, where otherwise the DSC system would entirely prevent acceleration.

Turning on DTC does NOT disable the DSC system, it just allows you to push the envelope further before the system intervenes.

Don't believe me? Turn on DTC and try to spin your car (somewhere safe please). When the system detects the rear end sliding out too far, it will kick in and bring you back into line.

Holding the button down fully deactivates the DSC system, eliminating ALL safety features of DSC (Dynamic Stability Control).


Edit -- My intention is not "drifting" so much as it is getting into a turn as fast as I can, getting THROUGH the turn with the highest speed I can, while using the least amount of throttle-inducing wheelspin so that when I EXIT the turn, the car is controlled, straight, and ready for full acceleration without kicking the rear end out too far, resulting in a spin or DSC intervention if activated.

Now that I've been running with the new pressures for a few days, I'm blown away. Why didn't I do this sooner? The car is a whole different animal now that it's completely neutral.

DTC is a mode within the DSC system. DTC stands for Dynamic Traction Control. This setting allows for mild to moderate wheelspin at the rear tires, enabling you to accelerate on icy roads or up icy inclines, where otherwise the DSC system would entirely prevent acceleration.

Turning on DTC does NOT disable the DSC system, it just allows you to push the envelope further before the system intervenes.

Don't believe me? Turn on DTC and try to spin your car (somewhere safe please). When the system detects the rear end sliding out too far, it will kick in and bring you back into line.

Holding the button down fully deactivates the DSC system, eliminating ALL safety features of DSC (Dynamic Stability Control).


Edit -- My intention is not "drifting" so much as it is getting into a turn as fast as I can, getting THROUGH the turn with the highest speed I can, while using the least amount of throttle-inducing wheelspin so that when I EXIT the turn, the car is controlled, straight, and ready for full acceleration without kicking the rear end out too far, resulting in a spin or DSC intervention if activated.

Now that I've been running with the new pressures for a few days, I'm blown away. Why didn't I do this sooner? The car is a whole different animal now that it's completely neutral.

Let me see if I understand this right. Push the DTC button once, it only disengages partially, push it and hold it for few seconds and it disengages completely. When you only push it in for a second the little warning sign "DTC" appears and then it goes of fand little sign "!" stays on. Then when pushing DTC button for few seconds the triangle in the circle appears and this is when the entire system is disengaged. ???????

I'm asking because on my E36 M3 back when I had it, you pushed the DSC button and all was off (at least I thought so). No need to push it and hold it like on 335i. But I've been pushing it on the 335i for a second as soon as I start the car. I don't like when I need to accelerate for whatever reason and my car is just bogging.

That pretty much sums it up. Setting it to DTC will leave the ! in the triangle, and give you some wiggle room to slide a bit and spin the tires a little when you need it.

I don't always hit it like you do, I've found I know when I"m gonna need it and go for it when I need it.

I like to leave the DSC on completely when I'm cruising, just in case something crazy happens it could save my ass.

in fact, a buddy of mine recently got a 335i and he can't keep up with me. mainly because he doesn't know about the DTC trick, and partially because I'm a very experienced driver in my car, but he's just coming from a '90 honda accord.. lol

in this case, 330 > 335i lol