26 replies to this topic

[Rev]

Hey guys, great site dedicated to a great car.

I live in a hilly speed bump infested area of Australia and my ride is grinding on the bumps due to being slightly lowered, and also i think because of the long wheel base on this car. I don't really want to raise the car much (cos it would look crap and it's only lowered about an inch off stock currently anyway), the best idea would be to put some slightly larger (and lighter) after-market wheels on her.

My issue is i am pretty new to Mitsu cars and am not really aware of what's good out there for my car or, more importantly, what won't cause issues with installation.

Anyway, any advice would be good. I am in Australia so access to JDM stuff is easy enough.

Thanks in advance.

[andy's-galant]

what size wheels are on there now?
If it was me i wouldnt put bigger wheels but i would be looking at bigger tyres and smaller wheels.
Our Sydney roads are very shocking, and me peronally wouldnt put anything bigger than 16inch with say something close to 195/50 series tyre would be ideal for sydney roads i reckon, but then again where your from could be way rougher

[bazeng]

17's or 18's look good on the vr4, anything smaller looks a bit funny but it really depends on what you want.

[JAP63]

If you want to lift the car a touch, then any combination with a diameter larger than 615mm will do it, as that is the stock size

If you go and get a 16 inch rim...then id be looking at around a 205/55/16, that tyre/rim combo is around 630mm, it will lift the car approx 8mm, and it wont look silly, i ran it myself for a while.

[Aussie Babsy]

If you want to lift the car a touch, then any combination with a diameter larger than 615mm will do it, as that is the stock size

If you go and get a 16 inch rim...then id be looking at around a 205/55/16, that tyre/rim combo is around 630mm, it will lift the car approx 8mm, and it wont look silly, i ran it myself for a while.

that's what i run on mine, and i think if you put anything bigger than that on u'll look like a your trying to show off to much.

[Rev]

thanks guys, will lifting it that way a little screw my speedometer reading? if so is that easily changeable?

*i got vr4 Auspec stockies on atm*

[JAP63]

The speed issue, wil almost be negligible, u might be a few k out , like maybe 3k @ 100kp/h..so 100k/ph on yourr dial will actually be around 103 k/ph, im working this out based on the estimation that a diameter of 630mm is around 2.5% bigger than 615mm, so if you add 2.5% to 100kp/h you get 102.5 K/Ph, if you get me, its near nothing....
As for your rpm, you will do slightly less revs on the highway etc, as a larger radius will decrease the rpm output.

You cant calibrate the speedo to it, not that i know of anyway, but its that minimal i wouldnt worry about it.

Edited by JAP63, 16 November 2008 - 12:16 PM.

[Rev]

great, any recommendations on a super light rim that will fit well? Got a white car too, not that fashion concerns me that much.

[VR-4Squid]

light weight tends to comprimise strength unless you go for expensive forged (rather than cast) wheels.

if you've got the money, volk TE37's would be my choice.

[foR.]

What size wheel diameter and width and what tire size is that? Looks awesome

[VR-4Squid]

16x7.5 and no idea on the tires, sorry. prob 205/50's ??

[foR.]

Nice, love those rims

Expensive arn't they?

[JAP63]

Expensive arn't they?

Yes.

[Rev]

i aint completely clear on the concept of 'offset'. Although i read an article on it, i am still kind of confused. I was looking at some rims, and the offset was 40, what does that mean and/or imply for my car compared to what you guys have?

What sort of room do i have to play with so i am not sticking out or grinding?

Edited by Rev, 19 November 2008 - 04:16 AM.

[JAP63]

i aint completely clear on the concept of 'offset'. Although i read an article on it, i am still kind of confused. I was looking at some rims, and the offset was 40, what does that mean and/or imply for my car compared to what you guys have?

What sort of room do i have to play with so i am not sticking out or grinding?

What car do you have?


Offset-Think of it like this, if you drew an imaginary line down the centre of the rim, that would be a 0 offset, if you had a rim like this, and it was say 8 inches wide, you'd have the centre hub, bolted up at dead in the centre...and 4 inches of rim toward the inside and 4 inches toward the outside, with me?


So when a rim has an offset of +40, the easiest way to think of it is that the hub flange (where it bolts up) is 40mm toward the outside face of the rim, if you had a -40 offset, then it'd be 40mm away from the centre line,toward the inside of the rim..make sense?

Look below at the pic to visualise it. Imagine how the rim would sit if the hub bolted up at the red line, thered be more rim toward the inside of the guards.

Imagine how itd sit if the hub bolted up to the green line, thered be a heap of rim sticking out, thats why negative offset wheels usually stick along way out, past your guards sometimes, and guard modifications are sometimes required. These type of rims allow for plenty of lip/dish..

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Edited by JAP63, 19 November 2008 - 05:10 AM.

[Rev]

cool, thanks man. Makes a little more sense. With that said, what sort of range does a 91' vr4 galant have in regards to offset?

[JAP63]

cool, thanks man. Makes a little more sense. With that said, what sort of range does a 91' vr4 galant have in regards to offset?

*opens a can of worms*
You asked for it, so read..........its been covered a zillion times over, theres quite a bit in it if you want to get right down to business and push the limits to the max offset etc...
Browse this........

Like you said +30 on a 9 is the go...

My car in that pic is 9 @+30..in the rear..juuuuust fits

It was actually +39, but with about 4-5mm or so notched from the control arms,so approx 30, and it needed camber at that height..but it works..

and this.......

With a 9" wide rim any MORE than +30 and it will hit the struts in the front, and the trailing arms in the rear.
Even so they will stick out of the guards - about 2" at the front depending how much camber you run. They'll stick out slightly less at the rear, again depending on the camber.

Then more detail................

Look here


http://4gtuner.com/s...read.php?t=2457




17x8 @ +35
-will be approx 10-12mm outside your front guard @ 0 degrees camber. (depends on tyres)
-In the rear, it shoul dfit fine, there is that much camber adjustment if it were a problem you could just chnage your camber...and you will only need to if it is really low.


I ran 17X9 @+39in the rear and had it really really low and i made it fit.


I think i was wrong then with saying you can run up to 6.3 inches of backspace

Ive just done some calculations on my old setup and i came up with;

I fit 17x9@+39 in the rear, this required about 5 mm control arm trimming.
So id say to be safe, a 9 inch rim in the rear really want a +30 offset.


To workout the backspace for a 9@+30, itd be...
9/2=4.5 inches, thats the centre of the rim,
Hence the flange is now 30 mm further toward the outer so we'd see 4.5 inches + 30mm.

Thats 114.3mm (4.5 x25.4mm) + 30mm=144.3mm, or 5.7 inches

This is the max in the rear...5.7 inches..
The front is a little more generous...but not by much,around 5.7-5.8 inches willhave the rim and tyre flush with the guard (0 camber), and near no clearance left on the inside toward the stock shock.

Those figures (5.7 Inches in the rear) are pushing it.
I agree with you at around 5.5 inches to be safe, though if the cars low, it wont fit the stock guards
But it does work @ 5.7 in the rear, as i said i ran 9@+39 in the rear with a minor control arm trim and thats around 6 inches of backspace

Having said all this, you need a neat tyre as well, with 6 inches of backspace, i had a stretched tyre to fit it, wouldnt have worked without it.

basically, it starts getting into backspacing, which essentially how much rim hangs back past the centre line/hub, the reason you need to know this is so you dont rub things


The rear of a vr4 is good for around 5.5-5.7 inches of backspacing, the fronts around the same, a little more generous.

and for more, try this........
http://4gtuner.com/s...ead.php?t=10225

[VR-4Squid]

It's also far easier to bend the metal out of the way on the outside (gaurds) than on the inside (struts/trailing arms).

[Rev]

I am starting to understand what you are getting at, but what i would really be after (cos frankly i suck at maths) is some sort of table for the vr4 (demanding eh?) that shows me what will fit and what wont.

Like i said at the start of the thread, i know jack all about this sort of stuff and just love getting more performance from my car (whilst not grinding speed humps or rims grinding against the car). That being said, i am willing to learn, but my mind and mathematics don't really mix that well and frankly equations make me wanna hang myself.

I know i am demanding but any help would be appreciated.

[VR-4Squid]

most common aftermarket 17" and 18" wheels are about 7 or 7.5" wide with an offset of around +40 which is perfect.

But that's lame.

get a small piece of wood and cut it to 5.5" long, provided the distance from the hub mounting face of the wheel to the inside edge of the rim is the same as the piece of wood, they will fit.
If they are very wide rims, you'll need to roll/stretch/flare the gaurds, but that's not hard until you go silly width wise.