Tire pressure

[Jin1976]

Maybe somebody has posted this before. Currently I am using 225/45/ZR16 fronts and 265/40/ZR17 rears. What will be the fight tire pressure to use? I am using Goodrich now after 10 months of Michelin (expensive!)

 

[nsxtasy]

Start with the tire pressures recommended by Acura - 33 front, 40 rear, measured cold. If you have any problems with uneven tire wear or handling, adjust accordingly.

 

[Jin1976]

Thanks for the input. I am using 32 fronts and 33 rears. 40 sounds a bit too much is it not?

 

[docjohn]

33 is low for a street tire on the rear. Why don't you compromise and go 38 rear and 34 front.I've found these to work well with so2 and so3 bridgstones.

 

[nsxtasy]

I've found that the recommended pressures work very well on the OEM tires (Yokohama A022H), so it's not too high. You could try docjohn's recommendation if you like; it's only 1-2 psi different from Acura's.

After a while, check how your tires wear. Classic sign of overinflation is greater wear in the center than along the edges, and underinflation is the reverse.

 

[CityofAngels]

My rule of thumb is 80% of the tire's max inflation pressure then adjust to your needs.

Remember that tires run for a long time over/under inflated have incorrect wear on them now. Either the edges have been excessively worn or the centers are worn. It will take a few 1000 miles to wear them back to "normal" so expect the feel of your new pressure settings to be a little strange.

 

[Jin1976]

I replaced the rears due to overinflation. Inflated them at pressure 34. Funny isn't it. Oh forgot I am not using OEM wheels instead I am using BR sport wheels which might be lighter than the original one so they might not flatten the tires enough. Anyhow thanks for the input.

 

[sjs]

Originally posted by Jin1976:
I replaced the rears due to overinflation. Inflated them at pressure 34. Funny isn't it. Oh forgot I am not using OEM wheels instead I am using BR sport wheels which might be lighter than the original one so they might not flatten the tires enough. Anyhow thanks for the input.

I don't know anything about BR wheels but very few are lighter than stock. Either way, wheel weight is important but it won't "flatten" the tire more or less. What tires do you have?

 

[nsxtasy]

Originally posted by sjs:
wheel weight is important but it won't "flatten" the tire more or less.

The weight that "flattens" the tires is the weight of the entire car. If each wheel is 2 pounds lighter, that reduces the weight of the entire car by around one quarter of one percent. In general, though, less weight is a good thing, not a bad thing.

 

[I Grok NSX]

I'm with DocJohn, I use 37 rear and 33 front. Soft enough for a nice ride for long distances, and sidewalls stiff enough for "spirted" driving. I've also found that the tire wear is even.

------------------
1994 Green-black roof/tan, 5 speed
Do you know of another Green-Black roof NSX?? Please email me if you do.

 

[sjs]

Originally posted by nsxtasy:
The weight that "flattens" the tires is the weight of the entire car. If each wheel is 2 pounds lighter, that reduces the weight of the entire car by around one quarter of one percent. In general, though, less weight is a good thing, not a bad thing.

Without bothering with the math that proves the obvious, which is that the added wheel weight as a % of total weight is insignificant, that's exactly what I said.

 

[nsxtasy]

Of course.

I wasn't disagreeing with you...

 

[Jin1976]

Would changing the stock exhaust and exhaust manifold to HKS sport has a significant reduction on the car weight cause I did it. I've also change the coil over to RSR.