whats your tire pressure on each wheel?

mine is like 29,29,29,27 FL FR RL RR

 

Your tire pressures are way too low, whether with stock wheels or aftermarket.

Check your driver's door plate for the recommended COLD tire pressure (which I use as the low psi baseline). Just don't go over 40 psi for daily driving.

Oh, and I'm at 36F/33R on stock 17" wheels (recommended is 32 all around on my 5A).

 

33 F / 36R --> those're my targets.


OE Recommended is 35 F / 32 R

 

eek! thx for the heads up

 

even though its low, my TPMS is saying that its OK.

 

TPMS operates in some range (something like 20% or 25% of the recommended pressure). So, it won't alarm until something like 26 pounds.

 

34 cold...38 warm

 

Isn't recommended tire pressure set by tire manufacture? i.e. on the track, Pirelli motorcycle track tires recommended are 30f/32r (hot). Michelins are 29f/29r (cold)

I think it may be best to contact a tire manufacture rep for accurate numbers. That's how it is with motorcycle tires, at least. Not sure if cars are the same.

Plus, I think the TPMS needs to be resetted quite often for accurate reads. That's been my experience, imo

 

35 all around.

 

TPMS is there to let you know if there is a slow leak etc .. not to be used as a substitute for a tire gauge.

 

Not to be smart, but doing some research on tire pressure threads, here are the pressures listed:
42-40
42-39
41-38
40-37
40-40
39-36
38-35
37-35
36-33
36-34
35-36
35-35
35-32
34-38
33-36
32-35
32-32

Take your pick, but nothing under 32 is found.

 

What is the average pressure increase going from a Cold to Hot tire?
+4 PSI ?

 

try 80% of the max weight max cold pressure- since the car is about 80% of the weight total the tires can carry- you may need to drop a few psi from there for comfort
example max 50-20% =40
For most of us that in the 36-40 range

For the OP- read the OWNER BOOK
the door sticker does not apply to aftermarket tires, and best mileage is obtained with slightly increased pressures

 

i learned that lower tire pressure gives more traction. when i got my car back from the body shop they aired it up to 41 cold, so it was ~45 warm. when i would floor it the tires would spin and spin and spin and spin till 3rd gear when i lowered the psi down to 34cold(38 warm) they wouldnt spin as bad...and i know u have to "feather" the throttle...it was just a "test:

 

That's dependent on the air/road temp, road surface type, tire manufacturer, etc..., but the norm is 4-6lbs

 

I don't think the Owners Manual qualifies the tire pressure recommendation to say, "When using Michelin MXM4 tires of 235/35-17 size and a service rating of 93W, the recommended tire pressure is .... ."

I don't see how a tire manufacturer can accurately recommend a pressure either. Is my 235/45-17 going on car x with weight y, or on car a with weight b? They can't know what the applicaiton is.

I'd *guess* the car manufacturer would be in a better position to make a recomendation since they know the vehicle weight, weight distribution, capability, top speed, etc.



BTW - I don't think you can "reset" the TPMS. At least not on any kind of a regular basis. Also from what I read the TPMS is approiximate and may vary from a decent tire guage by 0.5 - 2 psi.

 

The recommended pressures is listed on the drivers door sill. The lowest I've ever run is 32psi, I usually go up to 34psi. Hot vs cold is usually around 3psi more. When it gets cold, you're going to loose 1psi for every 10 degrees colder. With the lower pressure your gas mileage is going to suffer, but you will get a softer ride.

Dave