Vibration at 1,500rpm? Tire road noise?

Anybody else get an engine vibration more than normal around 1,500rpm? I just got this car and it has been the only thing I've noticed that might be a concern.

Also, I get a lot of tire road noise, need alignment possibly? They are Kumho Ecstas, stock sizes. They look practically brand new.

Here is my car...

http://www.nsxprime.com/forum/showthread.php/175314-Dreams-do-come-true-all-thanks-to-NFCUUUUUU!!!

Thanks!

Start with plugs. I had some idle misfire issues in the past with a hesitation between 1500-2000 rpm; especially evident in second gear with an early shift. Replaced the plugs and it all cleared up instantly.

freespace303 said:

Also, I get a lot of tire road noise, need alignment possibly? They are Kumho Ecstas, stock sizes. They look practically brand new.

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The two most common causes of a lot of tire noise are (a) tires that are quite worn - not applicable since you say they look brand new - and (b) "extreme performance tires" which typically have tread patterns with large tread blocks. Which kind of Kumho Ecsta tires do you have? The Kumho Ecsta XS is an extreme performance tire, so if that's what you have, that's probably why you get a lot of tire noise.

Poor alignment isn't a cause of tire noise...

+1
Ecsta XS tires are loud, and get louder as they wear. Also, they lose grip if the road isn't dry and clean.

After one set of these, I switched back to Yokos (AD08), excellent DD tires, although they are expensive.

Interesting...

Looks like they are XS's


Maybe at the next meet I can have one of yal to check it out, all you have to do is increase the revs to around 1500-1800rpm and its there. Rest of the rev range is smooth as butter, all the way to 8k no problem.

Some guy recommended Yokohama tires cause they are much quieter, but I can't find them in stock tire sizes for the NSX (on tirerack). Assistance requested! Thanks.

front - 215/45 16"


rear - 245/40 17"


NEVERMIND.... found THIS post. Looks like Tirerack will be getting them sometime in October.

freespace303 said:

Some guy recommended Yokohama tires cause they are much quieter, but I can't find them in stock tire sizes for the NSX (on tirerack). Assistance requested! Thanks.

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Most generalizations across an entire brand are just not true. The big factors in tire noise are the amount of tread depth (worn tires are notoriously noisy, new tires not so noisy) and type of tire (extreme performance tires are generally noisy). Specific models of tires can also be noisy; check the side-by-side tests on the Tire Rack website for comparisons.

The sizes you need for 16"/17" wheels on an NSX are 205/45-16 or 215/45-16 for the front, and 245/40-17 or 255/40-17 for the rear. The Yokohama Advan Neova AD08 was not available in a 16" front size for the NSX, and it's doubtful that the AD08R will be, either.

If you want the ultimate grip in a street tire, extreme performance tires that are available in NSX sizes include:

Bridgestone Potenza RE-11 205/45-16 and 245/40-17 or 255/40-17 (may be discontinued)
Toyo Proxes R1R 205/45-16 and 245/40-17 or 255/40-17
Kumho Ecsta XS 215/45-16 and 245/40-17 or 255/40-17
Falken Azenis RT-615K 215/45-16 and 245/40-17 or 255/40-17

The Bridgestone Potenza RE010, which was one of the original equipment tires designed for the NSX and offers precise handling feel, is still available in the stock '94-01 sizes, 215/45-16 and 245/40-17.

I am not aware of any maximum performance tires available in these sizes. If you're concerned about noise and/or treadlife, AFAIK you're going to have to accept the greatly-reduced performance of an ultra-high performance tire; the best of those is the Bridgestone Potenza RE760 Sport, which is available in 205/45-16 and 245/40-17 or 255/40-17.

Which one has the lowest road noise and best wear? That's what I'm looking for

freespace303 said:

Which one has the lowest road noise and best wear? That's what I'm looking for

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Already answered:

nsxtasy said:

If you're concerned about noise and/or treadlife, AFAIK you're going to have to accept the greatly-reduced performance of an ultra-high performance tire; the best of those is the Bridgestone Potenza RE760 Sport, which is available in 205/45-16 and 245/40-17 or 255/40-17.

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True directional tires are almost always going to be louder as well. Semi-directional tires like the re760's nsxtacy mentioned are a good compromise. They aren't the most quiet in the world but you also get pretty good performance, in the wet too.

What about hankook ventus RS 3