gg_got_a_tesla
Model S: VIN 65513, Model 3: VIN 1913
Indeed. Sent a followup email several hours ago with links to posts here (the one with the table and the one with a pic of the sticker). No reply thus far.
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P85D 19" tire pressure recommendation is now 50psi
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Indeed. Sent a followup email several hours ago with links to posts here (the one with the table and the one with a pic of the sticker). No reply thus far.
gg_got_a_tesla
Model S: VIN 65513, Model 3: VIN 1913
Andyw2100
Well-Known Member
That doesn't in any way explain why he initially gave you the wrong answer. Are there any other springs available on the P85D, other than coil or air? More specifically, he knew who you were, and what springs your car had on it. The wrong answer was just a mistake. I'd have more respect for Michael Vigil if he had just said, "I made a mistake."
gg_got_a_tesla
Model S: VIN 65513, Model 3: VIN 1913
Well, to add fuel to the fire, I was just informed by my local SC that the P85D 19" tire pressure recommendation has been officially changed BACK to 45psi.
"...we have made other firmware improvements that essentially allow the vehicle to achieve the same range at 45 PSI. So we made a running change to lower pressures to 45PSI as this is a good balance between range and ride comfort."
"...50 PSI may give you more range, just like it would give you better MPG on a gas car but it will cause the tires to wear unevenly and the tire won't have as good of contact with the road if it's over inflated. You should set your tires to 45PSI because that is what is recommended."
So there we have it. Back to 45psi, same as what my original sticker says. Btw - I never received the new stickers.
"...we have made other firmware improvements that essentially allow the vehicle to achieve the same range at 45 PSI. So we made a running change to lower pressures to 45PSI as this is a good balance between range and ride comfort."
"...50 PSI may give you more range, just like it would give you better MPG on a gas car but it will cause the tires to wear unevenly and the tire won't have as good of contact with the road if it's over inflated. You should set your tires to 45PSI because that is what is recommended."
So there we have it. Back to 45psi, same as what my original sticker says. Btw - I never received the new stickers.
The only way to test this and make sure the pressure is correct for your wheel/tire combination is to set the pressures, drive the car "normally", stop then measure tire temperature at 3 points across the tread for each tire, outside, middle and inside. IF the temperatures are equal across the 3, then you're good. Temperature high in the center, pressure too high. Center temp Low, then more pressure. The sticker gives you a good starting point and will probably work in most applications, but for YOU and how YOU drive, there is nothing better than knowing how your car is dealing with how you drive.
For me, specs are all a great place to start.
For me, specs are all a great place to start.
Andyw2100
Well-Known Member
I'd love to see something official on this, like that chart that was posted upthread or elsewhere when the change to 50psi was made.
Edit: The chart I'm referring to was upthread, in this post: P85D 19 tire pressure recommendation is now 50psi - Page 5
This part doesn't make a whole lot of sense. It implies the change to 50psi was made to increase range. But that was never the stated reason for the change. As I understood it, the change was recommended because of uneven tire wear.
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gg_got_a_tesla
Model S: VIN 65513, Model 3: VIN 1913
What silliness! I'm just going to leave them be for a couple of months and they'll get to 45 psi eventually.
I have done exactly that and used a thermal imager. 50 PSI on my 'classic' 85 with 19 inch wheels does not cause any uneven tire wear. I drove my tires at 50 for a long time and it works fine. Tires are used up very even. Yes higher pressure will cause a little less contact with the road. The loss is a small as the gain in range, though. The Model S is a very heavy car. 50 PSI is not 'overinflating' the tires. As far as I know, car manufacturers tend to recommend as low of a tire pressure as it is OK to get away with to increase ride comfort. The higher the tire pressure, the harder the ride. Most people prefer a smooth ride I guess.
The only annoying thing about using 50 PSI on the old Model S is that it will constantly complain about 'tire pressure too high'.
There's no evidence that that happens in practice in on-road driving. That's a kind of left-over from bias-ply tire days. With some tires, it's possible "if" they have a small crown radius. Most car tires these days have a very large crown radius (flat or almost flat). The vehicle placard pressure is a starting point, and should be adjusted based on actual driving conditions.
Every tire pressure recommendation is based on a set of assumptions. Change any one of those assumptions (daily highs for example) and the pressure needs to be adjusted (up in most cases).
I have an 85D built April 19th and delivered May 6th. Sticker on my door says 45 psi for all 4 tires.
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This an interesting thread. It is a Federal Regulation that the vehicle MFG provide a tire placard sticker with the correct tire size and inflation information. If the information is incorrect the vehicle mfg is required by law to provide correct stickers to all owners.
Andyw2100
Well-Known Member
If only there was a fast, inexpensive, easy way Tesla could disseminate information to all of us...
mrElbe
Active Member
I had my tire pressures set to 50 PSI for the trip to Custer SD and back. Had the car in for steering wheel alignment at Tesla service last Saturday and the work order has an item - Checked tire pressure and adjusted to 45 PSI.
I really doesn't matter much if you have 45 or 50. Both is fine and safe. The car's weight and tires haven't changed. The increased tire pressure was probably due to the higher top speed of the D models. But it's not like when you are driving 150 mph at 45 PSI vs 50 makes a big difference. And since none of us is driving that speed, you're fine one way or another. Use 45 if you prefer the smoother ride, use 50 if you want 2% more range.
Andyw2100
Well-Known Member
I do think it is likely that Tesla has adjusted back to 45 from 50.
But I wouldn't necessarily be willing to make that conclusion based on the above. In my opinion, and knowing how good Tesla is at communication, the above is almost as likely to be a result of the service center where you had the work done never knowing about the original change --to-- the 50 psi recommendation as it is due to them knowing about both changes.
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