OK, this has been bugging me and I can't stand not knowing...

I see Infiniti I30's (even new ones) that look like 3rd gen Max's, and I figure they must be built on the Maxima platform. I wonder what the differences are?

Then, last night I see a G20 that also looked like a Maxima 3rd gen.

Does anyone know which Infinitis are built on the Maxima platform and what is changed to make them a "luxury" car (i.e. how, for instance, are they made to be so much quieter?). This question probably leads to asking "Is there anything simple that I can do to lower the overall road noise in my Maxima?" by taking my lead from Nissan and what they did with the Infiniti?

 

I30 = 4-gen I35 = 5th gen
G20 most related to Sentra
Infiniti upscale div of Nissan. More sound deadening etc.

Next!

 

What Jeff said.

to get rid of road noise- check all doors and weatherstripping for proper sealing. HUGE component of wind noise comes in around the door jambs.

also add some sound deadening materials to the front and rear door skins and rear deck on the car. cover the rear wheel wells as well.
even with my huge 265/40/17 race tires on the car, I can hear myself breathe at 100mph on the highway.... but I've got 60+lb of dynamat in the car.

 

matt, where did you choose to put the dynamat?
-M

 

read my post above.

all those, plus the trunk floor, sides, and lid.
~135dB stereo and you can barely hear it outside with the windows up. no rattles at all.

http://mattblehm.com/pics/car/stereo/dynamat/

 

What? How did you get those to fit?

 

a big hammer.
they don't fit actually. no chance on the rears- I can't even torque the lugs before it hits the strut...
on the fronts, they rub the fenders when I go over large bumps. I used them a couple times for auto X, but now I just keep them for drag tires.
I'm back to 235/40/17 slicks for race tires now. much cheaper and no rubbing.

 

where can you get dynomat and how much does that stuff cost, to have enough to put it everywhere you did? and also, where can you get new rubber molding for around the doors and trunk?

 

read the car audio forums for sound deadening materials.
moldings= dealer. bend over and enjoy.

 

235-40-17 is too small.

 

it's not when you don't care about your speedo being off... for track use, the shorter sidewall is better for turn-in response and overall cornering ability.

my street tires are 235/45/17, and come to within a 1/4" of my rolled fenders already. if I put 245s on there, they will rub on corners.

 

I've read about people having 245's and no rubbing. I guess it depends on the rims and suspension set up? I ask this because I want 245's myself for less squealing in the corners, but am not fond of rubbing.

 

I had to roll my fenders, and I only have 235's on wheels with a 30mm offset.

 

235s with 30mm offset will be VERY close.. I had to roll my fenders using 235 with 32 offset... I'm also quite a bit lower than some of you, and I might even have a bit of frame tweakage going on.. one side on the rear clears by 1/4", the other side rubs. doh.

 

Brad since we have the same wheels:

With 235-45-17s I never had a tire rub problem. I'm running 245-45-17s and they only run every once in awhile and only in the rears.

 

Hmm, there must be just slight differences in tire width (brand) or fenders between us. My rubbing wasnt major though, but it would hit the edge of the tire under hard constant cornering. By the way, how do you like the 245's compared to 235's?

 

I think it's just model differences. Because you can see diff clearances on both sides. But with 2 diff sets of Rustang wheels, I've never had rubbing with 235s. The only reason I use the 245s is because that is the std size that these wheels/tires come in. And the tires were almost brand new when I got them (abiet with some dried bug guts on the treads) I would rather have the 235s and the 245s look more balloon-ish.