| Author |
Message |
Joshua White
Tinkerer
Qld
SC400 GT V8 Supercharged
Posts: 76
Reg: 11-2006
|
hey guys, i'm looking at a set of 19" mags for my soarer and i'm wondering if there are any ways to have it so your speedo isn't out of wack at all, any way of doing this? and how much dish on 19" can i get away with before i need to make some modifications to the gaurds etc.? |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2487
Reg: 01-2005
|
245 front 275 rear should keep your speedo in check 
you can fit a 10" wheel under there... all has to do with offset... what offset are the ones your looking at? |
Joshua White
Tinkerer
Qld
SC400 GT V8 Supercharged
Posts: 78
Reg: 11-2006
|
i'm not definite but i think they're +35mm offset. so say i just ask them for a range that'll suit the soarer and 245 front and 275 rear will they fit no worries? |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2489
Reg: 01-2005
|
LOL..... if they are a +35mm you can put them on a skyline.
to fit a 275 nicely you want ATLEAST a +42 offset, preferably 45-50. |
Joshua White
Tinkerer
Qld
SC400 GT V8 Supercharged
Posts: 79
Reg: 11-2006
|
alright then. so if i tell them all this they'll be able to show me a range of mags that suit that? so 245 front, 275 rear and at least +42 offset? |
Justin Camilleri
DieHard
QLD
Had a 85 MZ10, 92 TT, Now 91 TT
Posts: 510
Reg: 07-2005
|
Ummm... What's the width of the tyre got to do with it?? Shouldn't it be the height of the tyre, for speedometer purposes. Basically you will have rubber bands for tyres. |
Ben Lipman
TryHard
NSW
Soarer TT manual
Posts: 480
Reg: 04-2006
|
Justin Camilleri wrote on Sunday, March 25, 2007 - 10:46 am:Ummm... What's the width of the tyre got to do with it?? Shouldn't it be the height of the tyre, for speedometer purposes. Basically you will have rubber bands for tyres.
Yes and no. Tyre profile size is a factor of width. I'd love to say a percentage of the width but it isn't quite right. For example, a 40 profile on a 275 tyre will be 'taller' than a 40 profile on a 205 tyre.
On my car to get the height (or rolling diameter) the same front to rear I have 275/35 and 245/40 tyres on 9.5 and 8.5 inch wheels.
Note: This is my interpretation only. I am not a tyre dealer/fitter/manufacturer by any means. |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2490
Reg: 01-2005
|
Ben Lipman wrote on Sunday, March 25, 2007 - 11:05 am:On my car to get the height (or rolling diameter) the same front to rear I have 275/35 and 245/40 tyres on 9.5 and 8.5 inch wheels.
This combo will get you as close to the factory settings as possible.. |
Daniel Trivuncevic
DieHard
NSW
TT
Posts: 647
Reg: 07-2005
|
running 225x35x20 and speedo is 100% accurate.. |
Matthew Sharpe
Goo Roo
North Island
JZZ31
Posts: 2370
Reg: 10-2005
|
And 100% rubber-bandy. (Don't mind me, just not my style) |
Nathan Stewart
TryHard
WA
TT 5sp
Posts: 104
Reg: 09-2005
|
Josh go down to a tyre dealer and ask them. They should have a chart with all the different size tyres and their rolling diameters. You can never really match them exactly to the stock rolling diameter but can get pretty close. They will be able to tell you the closest size.
Someone correct me if im wrong but i was under the impression that the speedo on the soarer didnt run off the rolling diameter of the tyre? Also check out the legalities of not having a tyre size present on the tyre placard on your car, because im pretty sure they only go up to 17" |
Scott Ferguson
DieHard
Alberta
Soarer GTT-L
Posts: 535
Reg: 07-2006
|
Of if you'd like you can use Tire Rack's website with full specs on all the different tires they have available.
http://www.tirerack.com/ |
Matthew Sharpe
Goo Roo
North Island
JZZ31
Posts: 2378
Reg: 10-2005
|
Nathan Stewart wrote on Monday, March 26, 2007 - 07:42 pm:speedo on the soarer didnt run off the rolling diameter of the tyre?
As with most cars, the speedo is driven off the final output from the transmission, so tyre size has a direct effect on speedo accuracy.
Lots of calculators available on the web. |
Justin Stanley
Newbie
NSW
V8 Limited
Posts: 3
Reg: 09-2006
|
Yeah I have 235x35x20 and my speedo is 1 to 2km out I still cant get over how soft the ride is in these cars even riding on 20's
though I used my Navman to judge actual speed so it might have been out a bit more |
Christian Zimmer
Tinkerer
Victoria
TT
Posts: 44
Reg: 09-2006
|
Hey Justin.......That is one hell of a sexy soarer you got there!! |
Justin Stanley
Newbie
NSW
V8 Limited
Posts: 4
Reg: 09-2006
|
Cheers but that photo in my profile has been slightly photoshopped
It sits about 2" higher then that and still has door handles and the Limited badges
That is my current desktop background so I played with it a bit on PS and cleaned it up |
Greg Nikitiuk
Goo Roo
Vic
Celsior
Posts: 1048
Reg: 07-2005
|
you must be pretty good with PS Justin  |
Justin Stanley
Newbie
NSW
V8 Limited
Posts: 5
Reg: 09-2006
|
Yeah I actually did that one at work the other day... Being head of graphic design for a publishing house has its good points 1 being a lot of flexibility with my time  |
Luke Middleton
TryHard
NSW
V8 Limited
Posts: 165
Reg: 07-2005
|
I have 245x35x20 on the rear and the speedo is out 3k's if that's any help. |
David Vaughan
Goo Roo
ACT
V8 Ltd manual
Posts: 3265
Reg: 07-2005
|
"1-2k out", "3k out"
At 10km/h or 150km/h? 
If your tyres are selected to fit within legal variations (typically within 3%) then your speedo variation will be within 3%, by the same parameter. |
Rob Andreacchio
Moderator
Victoria
Supercharged VT Calais & 1991 JZZ30
Posts: 2616
Reg: 01-2005
|
mine speedo reads 100 and I am actually doing 102... checked with GPS... |
Jeff Wilkins
TryHard
South Australia
JZZ30 GT-TL
Posts: 384
Reg: 07-2005
|
Just as an aside, having worked with the DVT at Holden (the big dyno looking thing that is used to test/check/calibrate as part of validation) the speedo's on dunnydores is set slightly higher than actual speed and the margin gets larger the quicker your going (60 kmh reading - 56-58 kmh actual / 110 kmh reading 103 - 106 actual is about normal).
Never bothered to find out if this was a production stipulation backed by any legal requirements or if they were just playing it safe. I'd hazard a guess and say that most manufacturers would work to a similar standard (in that area at least). |
Rodolfo Chapa
Newbie
VA
V8
Posts: 5
Reg: 11-2008
|
Nice car Josh, by the way.. where did you get the clear side markers lights..? |
Brendan McGannon
TryHard
s.a
JZZ30 'drift supreme' and JZS147
Posts: 204
Reg: 05-2006
|
Rob Andreacchio wrote on Sunday, March 25, 2007 - 10:31 am: ATLEAST a +42 offset, preferably 45-50.
the biggest downfall of almost every toyota is the gay offset they are equipped with
there is nothing cool about +50 |
Michael Fabian
Tinkerer
queensland
soarer JZZ31
Posts: 45
Reg: 07-2008
|
My speedo says 100 when i am really doing 112!!!
Its messed up. |
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31
Posts: 10235
Reg: 11-2004
|
Any chance it has a V8 diff? |
Chris Lock
TryHard
sa
V8 Limited
Posts: 242
Reg: 03-2008
|
dunno about speed, but when the road signs said i'd done 1km, the speedo said i'd done a little more i think...i was about 30m(guess) short of the sign when it hit 1km... |
Matthew Sharpe
Goo Roo
North Island
JZZ31
Posts: 3884
Reg: 10-2005
|
What is your tyre size? |
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