Dodgy Diy Test Fit

[Silver_R34_GT-T]

rs73, the before pic of the rims looks so much nicer, i dunno why you changed em, but i guess each to their own

[rs73]

Hm, yeah that's 2 pro against 2 con opinions already....

Originally I wanted something larger as the 18" kinda look small on the shape of the V35, but even with 19" it doesn't look big at all.

I think if I'm ever going back to 18" again I want to restore all the horrible gutter rashes on all 4 rims before putting them back on...

In the 640x480 pics they didn't show but the scratches were really terrible. That was how I got the car, most likely done in Japan (both side!). Had quotes $350 a piece to restore them back to the factory high silver finish.

[Stephen Thorpe]

After about 50-60km of driving I found that the ride is a little bit bouncy especially for mid corner bumps.

I wonder if the tyre shop has put too much pressure or is it the fact that adding 1kg of unsprung weight onto each corner is enough to upset the handling?

The std 18" was supposed to have 210kPa front and 214kPa rear. So i'm not sure going lower profile from 45 to 35 profile would translate to requiring more tyre pressure, or less, or keep it the same?

On the road the Nankang NS-II is not really a quiet tyre, perhaps being 245 wide at the front and 275 wide at the rear may contribute to increased road noise due to increased surface contact area. Also the wide tyre seem want to follow every undulation on the road surface during low speed manouvre (ie 30-40km/h) but doesn't feel any difference for speed over 60km/h... No vibrations though although only tested up to about 80km/h on the highway - haven't tested on the freeway yet.

Also using the tyre size calculator, I found that the new 19" tyres brings all overall diameter smaller.

Front is reduced by 5.6mm (from 579.7mm to 574.1mm) and the rear is reduced by only 2.6mm (from 677.7mm to 675.1mm).

Although I heard that reducing the diameter may allow faster acceleration (but lower top speed), however I found that during

acceleration the car felt not as powerful as before?

Any ideas from you guys if you're some sort of 'tyre experts'?

Not a Tyre expert, but I know how to wear them out a bit...

Pressure is Pressure, regardless of the tyre size and you shouldn't really change the value too much regardless of the size. Most tyres work better at 10% more than vehicle manufacturer recommendations too.

Does the V35 recommend those values, golly gosh!

210 kpa is way too much for any car tyre in my opinion, my calculations make that 44.9psi. I would never have anything more than 40. Currently I run 36-38psi on 225/40R18 tyres. 40-45psi, would see a bouncy ride.

As for 214kpa, that is only 45.5psi, which doesn't make sense, front compared rear.

Do you have the pressure figures stated above correct?

What are now in the tyres? I doubt the shop would have put in 45psi, unless that is what you asked for.

Reset them to 36psi and then try it...

I doubt that you would notice the 1kg difference in unsprung weight, all larger wheel/tyre combo's will weigh a bit more as there is more Alloy in the package.

As for the tyres, at that width they will tramline and some tread patterns and compounds will be noisy. Pressure will also effect this a little...

3-6mm smaller diameter is not much (1.5-3mm radius will not effect much), especially acceleration, gearing or speedo error being very similar across the board. How much do the tyres wear over their life? More than this I am sure...

As for tyre calculators, it is better to take a look at each of the tyre manufacturer's websites and compare the rolling diameter of each tyre, you will probably find they differ from your figures a bit. Look back at your old tyre too and check the tread depth figures too. Pressure will also change the diameter of the tyre too...

Edited January 6, 2009 by Stephen Thorpe

[rs73]

Thank's...

Interesting... my old tyres is Kenda. I can't find much info about them... bloody compliance tyres... where the heck do the RAWS come up with all these weird brands from???

I've got Infiniti G35 tyre label that I purchased from USA (although they have english/spanish bilingual and doesn't look like the same with what Nissan and RAWS uses over here in Aust for tyre labels).

They are 240kPa front and back, but they are not 40+ psi as you indicated, they are 35psi.

So the one on the Japanese label 210 & 214 I would imagine they will be somewhere around 31-32psi.

So where did you get your calculation from, are the formula accurate?

[scathing]

I like em.

[Stephen Thorpe]

Thank's...

Interesting... my old tyres is Kenda. I can't find much info about them... bloody compliance tyres... where the heck do the RAWS come up with all these weird brands from???

I've got Infiniti G35 tyre label that I purchased from USA (although they have english/spanish bilingual and doesn't look like the same with what Nissan and RAWS uses over here in Aust for tyre labels).

They are 240kPa front and back, but they are not 40+ psi as you indicated, they are 35psi.

So the one on the Japanese label 210 & 214 I would imagine they will be somewhere around 31-32psi.

So where did you get your calculation from, are the formula accurate?

Off the net, online converter...

Low 30psi is not enough and it needs to be high 30psi. I would imagine that would be some of your problem especially with low profile tyres.

Exactly what r they in psi?

[rs73]

I need to go and get a tyre pressure gauge before I can tell you what's in there, or find a reliable petrol station air gauge.

I might do it the next time I fill up petrol.

[andy65b]

Hi Rianto

Firstly.....accurate tyre pressure gauges at servo's do not exist.

Buy a good gauge and put it in your glove box. You will thank your self in the long run.

I took my car to get a wheel alignment by a guy in Sydney that is "old school" in wheel alignments and understands the geometry's and effects of changes. (SydneyKid also recomended him) For the M35 he recomended 36psi in the front and 34psi in the rear. He said as most of the weight is in the motor you want the front higher than the rear.

I like the look of the standard rim, very similar to the M35 rim that I took off my car and I still look at it 3 months later and wonder if the OEM ones would be better. But your car now looks unique to you and I am sure the 19's will improve performance overall. I am saving for my set of 19's.

Cheers

Andy

[rs73]

do you reckon M35 have the same weight distribution with a V35?

I thought being a wagon you may wanna put a bit more pressure at the back in case you need to carry some load.

Unless you are planning to just put your shopping/groceries at the back only...

[rs73]

Why do missus & large rims extremely incompatible

This is what she did in 5 minutes of driving 3 blocks from her office to mine...

Any recommendation on good repairer? Prefer someone who is open and can do it on SATURDAY or weekends only...

[Stephen Thorpe]

Man that is not good, but it is bound to happen at some point...

Is the woman now only allowed to drive shopping trolleys?

Go to your local Bob Jane outlet and they have a place in Melbourne, but it isn't a Sat Morning job.

So take a pair of your old wheels and swap that axle over...

BJ's are normally open till 4 on Saturday.

[rs73]

Thank's, I know it's not gonna be a one day job, but I just need a place that is open on Saturday for me to drop off and potentially pick it back up the following Saturday.

[whtbox]

can try call touch up guys.

http://www.touchupguys.com.au/touch-up-guy...CFQhJagod5QmcDg

[BLISTC]

if you were in syd i could do em for u in a few days

[rs73]

Thank's... I've dropped it to Advanced Alloy Repairs... will cost $160 to fix that one rim and will be done in a few days... I should be able to get it back on the car on the weekend...

[andy65b]

do you reckon M35 have the same weight distribution with a V35?

I thought being a wagon you may wanna put a bit more pressure at the back in case you need to carry some load.

Unless you are planning to just put your shopping/groceries at the back only...

Yes, I would think it is pretty close. A M35 is 52/48 front to rear. Maybe the V35 is not quite that good .

When doing trips with a load I put more in the rear.

PS. I don't do the groceries. That is why I have a wife.

And thank god my wife does not like my car and does not drive it.

[rs73]

V35 sedan is 52/48 as well, V35 coupe is almost 50/50, I think something like 51/49... i have the JDM brochure lying around in my living room, but I'm a lazy ass to dig it out. It was written in there.