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I guess a 'D' is heavier with the second motor... (and a P85D is heavier than the 85D because of the bigger rear motor).would this be specific to the P85D or 19" on all models? I don't see why a 'D' would be different than the other models.
Was there a service bulletin? Or just a tech who told you this?
I guess a 'D' is heavier with the second motor... (and a P85D is heavier than the 85D because of the bigger rear motor).
I gotta look what my tires are at; I bought the pump from them when I got my 60 and had a leaking tire early on.
I believe so, but last time I checked the P85 didn't have a motor in front. Hence my comment that the P85D was heavier.Isn't the rear P85D motor and rear P85 motor exactly the same?
My new P85D says 50 psi on the door sticker.
Isn't 51 psi the max inflation pressure for the Primacys? Mine came 51 psi on all 4 corners from the factory last week. Warm, they're 54 psi.
I wonder why they changed it? Seems dangerous.
Was there a service bulletin? Or just a tech who told you this?
That's a very important question as 50 psi is the upper pressure limit for a number of tires. Inquiring minds want to know
But the front motor probably only adds 50-75lbs or so....not enough to justify raising tire pressure so high. I mean honestly adding a passenger to the car adds more weight than the front motor does.
Since the Ds are not traction limited, it makes sense to raise the pressure for reduced tire wear and better efficiency. The RWD models (Ps at least) are traction-limited typically, so that ends itself to lower pressures to increase the contact patch.
My S85, delivered March 28, came with the tires inflated to 50 psi, though the door jam sticker says 45 psi. So the increased pressure is not only for the P85D.
Googling a bit came up with a few interesting hits. Particularly this older thread where these guys run 60-70psi in 44max psi rated tires to get better mpg. Tire pressure above 44 psi? - CleanMPG Forums There was a mention of someone running 120psi and a mention from an engineer that said tires wouldn't spontaneously blow up until well after 200psi.
I may go out and pump up my tires to 50psi and see if it makes any difference. It's probably negligible.
My S85, delivered March 28, came with the tires inflated to 50 psi, though the door jam sticker says 45 psi. So the increased pressure is not only for the P85D.