Why doesn´t Nissan instaled on the Z the correct rear tire size?
09-18-2006, 03:48 AM
#1
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Thread Starter
Why doesn´t Nissan instaled on the Z the correct rear tire size?
If i open a tire size calculator like http://www.1010tires.com/TireSizeCalculator.asp
and simulate the next tire set i will realise that Nissan set up the wrong tire size!
Let´s simulate !!!!
If i have a 225/45-18 front, and 245/45-18 rear i will have a diameter difference of 2.67%
but
if i change for a 225/45-18 front and 255/40-18 rear i will have only a diameter difference of 0.24%
My conclusion is that the 255/40-18 is the correct tire size !
I´m i correct?????
and simulate the next tire set i will realise that Nissan set up the wrong tire size!
Let´s simulate !!!!
If i have a 225/45-18 front, and 245/45-18 rear i will have a diameter difference of 2.67%
but
if i change for a 225/45-18 front and 255/40-18 rear i will have only a diameter difference of 0.24%
My conclusion is that the 255/40-18 is the correct tire size !
I´m i correct?????
09-18-2006, 04:34 AM
#2
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not sure but i'm pretty sure the nissan engineers know what they are doing, if they can design and engineer an entire engine they can probably figure out what size tires to use
09-18-2006, 04:44 AM
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Wrong buddy! There supposed to be staggered. That's the way the car was designed. You'll find that most rear wheel drive's will have the same staggered setup. The rears have to be bigger. If you go for a smaller diameter in the rear, you can confuse the VCD, ABS, and all the electronic driving aids.
09-18-2006, 07:20 AM
#6
Stagger, I hate that word, it is used for both diameter and width in conversation.
The factory chose to go with a larger diameter back tire than front, probably for styling reasons more than anything. Had they wanted to, they could have gone with equal diameter all the way around. I am currently running a 1" front/rear diameter difference (about 1/2 more than factory tires) and if anything it has loosened up my TCS to let me get a little more slip before the SLIP comes on.
If you decided to go with the same diameter all the way around, you may end up with VDC/TCS issues (some report problems, others report no problems).
As for width, the computer could care less how wide your tires are. You could have 295s out back with 225s in front, as long as the hight is within tolerance, the computer would not care. Not that I would want to drive a Z with that setup, it understeers enough as it is.
Chris
The factory chose to go with a larger diameter back tire than front, probably for styling reasons more than anything. Had they wanted to, they could have gone with equal diameter all the way around. I am currently running a 1" front/rear diameter difference (about 1/2 more than factory tires) and if anything it has loosened up my TCS to let me get a little more slip before the SLIP comes on.
If you decided to go with the same diameter all the way around, you may end up with VDC/TCS issues (some report problems, others report no problems).
As for width, the computer could care less how wide your tires are. You could have 295s out back with 225s in front, as long as the hight is within tolerance, the computer would not care. Not that I would want to drive a Z with that setup, it understeers enough as it is.
Chris
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09-19-2006, 04:47 AM
#8
Originally Posted by HyperSprite
Stagger, I hate that word, it is used for both diameter and width in conversation.
The factory chose to go with a larger diameter back tire than front, probably for styling reasons more than anything. Had they wanted to, they could have gone with equal diameter all the way around. I am currently running a 1" front/rear diameter difference (about 1/2 more than factory tires) and if anything it has loosened up my TCS to let me get a little more slip before the SLIP comes on.
If you decided to go with the same diameter all the way around, you may end up with VDC/TCS issues (some report problems, others report no problems).
As for width, the computer could care less how wide your tires are. You could have 295s out back with 225s in front, as long as the hight is within tolerance, the computer would not care. Not that I would want to drive a Z with that setup, it understeers enough as it is.
Chris
The factory chose to go with a larger diameter back tire than front, probably for styling reasons more than anything. Had they wanted to, they could have gone with equal diameter all the way around. I am currently running a 1" front/rear diameter difference (about 1/2 more than factory tires) and if anything it has loosened up my TCS to let me get a little more slip before the SLIP comes on.
If you decided to go with the same diameter all the way around, you may end up with VDC/TCS issues (some report problems, others report no problems).
As for width, the computer could care less how wide your tires are. You could have 295s out back with 225s in front, as long as the hight is within tolerance, the computer would not care. Not that I would want to drive a Z with that setup, it understeers enough as it is.
Chris
Diameter difference and most certainly width too, have been decided by the styling department. The exact spec will be decided by the chassis guys of course, but that car has to Look Fast in order to appeal to the target buyer.
Originally Posted by alexml
you think that in the 3 % tolerance the VDC will do ok?
would i change the rear tire for 255/40-18 ? or not ??
would i change the rear tire for 255/40-18 ? or not ??
Now, it is smart enough to allow a good amount of flexibility. So it wouldn't be that bad.
Except that with 225 front and 255 rear, you'll be getting more understeer. It's still okay. I run 235/40R18 and 255/40R18.
09-19-2006, 05:14 AM
#9
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Thread Starter
let me see if i get it !
now the problem is not the diameter difference frt and rear... because that is in the % limit... now i have to take care of the understeer.
so...more understeer if more diference on tire size on frt and rear ?
can i say that if i run similar tire size on frt and rear and still geting the diameter difference on the 3 % it will be the best choise ??
now the problem is not the diameter difference frt and rear... because that is in the % limit... now i have to take care of the understeer.
so...more understeer if more diference on tire size on frt and rear ?
can i say that if i run similar tire size on frt and rear and still geting the diameter difference on the 3 % it will be the best choise ??
09-19-2006, 05:29 AM
#10
Originally Posted by alexml
can i say that if i run similar tire size on frt and rear and still geting the diameter difference on the 3 % it will be the best choise ??
The Best Setup will be the one youre most comfortable with. It will also be depended on the application. If youre just driving on open road, an OEM-like staggered setup should be enough. Autocross guys like to run same with all around to help with the initial turn-in. Road track guys usually go for a staggered setup.
You have to ask yourself what it is youre trying to achieve.
09-19-2006, 05:40 AM
#11
New Member
Thread Starter
OK... i think your right ...
now i have to buy new rear tires but the frt will be the OEM... and so i think i´m goingo to the 255/40-18 and if i realise that it isn´t the best choise i will only have to change the ftr to 235/40-18... but only if i feel my Z understeering ...
thanks PPL...
now i have to buy new rear tires but the frt will be the OEM... and so i think i´m goingo to the 255/40-18 and if i realise that it isn´t the best choise i will only have to change the ftr to 235/40-18... but only if i feel my Z understeering ...
thanks PPL...
09-19-2006, 06:03 AM
#12
You should be ok with the 255/40-18, the speedo will be off a bit reading faster than you are really going but only by a few miles per hour as long as the tires are actually the size they say they are. I know others are running a 245/40~255/40 combo with success as well.
On the tires being the size they say they are, I posted this at some point
Anyway, hope this helps.
Chris
On the tires being the size they say they are, I posted this at some point
So I have a set of stock 17 inch tires, stock 18 inch tires and my new set of wide 18 inch tires. The other day I noticed that the 17 stack was taller than the 18 stock stack and thought "that's odd, the 17s should be narrower", so today I apparently was board for 20 minutes and measured the tires to see what was up.
Notes: Measurements are in inches and were taken with a slide clamp and yard stick.
Cross section was measured at the widest part of the tire.
Tread Width was measured from the outside edge of the tread blocks.
Patch Width is the section of tire that seems to be wearing, as opposed to the part of the blocks that wrap around the sides and only get use on hard cornering.
Here is what I got:
Front Stock 17x7.5 RE040 225/50R17
Diameter: 25.00
Cross section: 9.00
Tread Width: 8.50
Patch Width: 7.75
Rear Stock 17x8 RE040 235/50R17
Diameter: 25.50
Cross section: 9.94
Tread Width: 9.00
Patch Width: 8.25
Front Stock 18x8 RE040 225/45R18
Diameter: 25.25
Cross section: 9.00
Tread Width: 7.94
Patch Width: 7.19
Rear Stock 18x8 RE040 245/45R18
Diameter: 26.00
Cross section: 9.25
Tread Width: 8.56
Patch Width: 8.00
Front Kuhmo SPT 18x9.5 275/35R18
Diameter: 24.95
Cross section: 10.75
Tread Width: 10.25
Patch Width: 9.5
Rear Kuhmo SPT 18x9.5 275/40R18
Diameter: 26.00
Cross section: 10.75
Tread Width: 10.25
Patch Width: 9.5
As you can see, the stock 17s are wider than the stock 18s even though the sizing would indicate otherwise, odd.
Stuff to consider when using tire calculators.
Chris
Notes: Measurements are in inches and were taken with a slide clamp and yard stick.
Cross section was measured at the widest part of the tire.
Tread Width was measured from the outside edge of the tread blocks.
Patch Width is the section of tire that seems to be wearing, as opposed to the part of the blocks that wrap around the sides and only get use on hard cornering.
Here is what I got:
Front Stock 17x7.5 RE040 225/50R17
Diameter: 25.00
Cross section: 9.00
Tread Width: 8.50
Patch Width: 7.75
Rear Stock 17x8 RE040 235/50R17
Diameter: 25.50
Cross section: 9.94
Tread Width: 9.00
Patch Width: 8.25
Front Stock 18x8 RE040 225/45R18
Diameter: 25.25
Cross section: 9.00
Tread Width: 7.94
Patch Width: 7.19
Rear Stock 18x8 RE040 245/45R18
Diameter: 26.00
Cross section: 9.25
Tread Width: 8.56
Patch Width: 8.00
Front Kuhmo SPT 18x9.5 275/35R18
Diameter: 24.95
Cross section: 10.75
Tread Width: 10.25
Patch Width: 9.5
Rear Kuhmo SPT 18x9.5 275/40R18
Diameter: 26.00
Cross section: 10.75
Tread Width: 10.25
Patch Width: 9.5
As you can see, the stock 17s are wider than the stock 18s even though the sizing would indicate otherwise, odd.
Stuff to consider when using tire calculators.
Chris
Chris
09-19-2006, 06:31 AM
#14
Originally Posted by HyperSprite
Not that I would want to drive a Z with that setup, it understeers enough as it is.
Chris
Chris
Maybe I need more practice.
09-19-2006, 06:32 AM
#15
Originally Posted by 350Zenophile
Kolia, Is that on your track wheels? Got any pics of that you can share?
I have a couple of pictures here and there. I cant access my Fotki account from here. Have a look : www.fotki.com/kolia
09-19-2006, 07:50 AM
#16
Now I'm curious....I have an enthusiast model with TDS and I currently have 19x8.0 up front and 19x9.5 out back. I am thinking of going to 20x9.5 out back with 19x8.0 up front or possibly 20x 10 for the rear and 19x8.5 in front. Are there potential problems with either set-up ie. TDC , handling tire wear etc???
09-19-2006, 07:54 AM
#17
Originally Posted by z350boy
Now I'm curious....I have an enthusiast model with TDS and I currently have 19x8.0 up front and 19x9.5 out back. I am thinking of going to 20x9.5 out back with 19x8.0 up front or possibly 20x 10 for the rear and 19x8.5 in front. Are there potential problems with either set-up ie. TDC , handling tire wear etc???
You will probably loose some performance from the added rotational inertia of the bigger wheels. But thats secondary if look is what you want.
10-10-2006, 09:19 AM
#18
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Tires
I too have an 05 Track with stock Rays wheels . I don,t like the stock tires and would like to hear more about Kolia's set up. What tires are you running? What did changing the tire width's due to the handling of your Track. Thanks for your help. Mike
10-10-2006, 09:46 AM
#19
I had a (few) set(s) of Falken Azenis RT-615 last year. I used them as dual purpose street/track. Very good tire in the dry, it can quickly get overloaded on the track if you’re not careful. IMO, one of the best street tire for occasional track use.
They get pretty hairy in the wet once you reach the 50% wear mark. Not for rainy days.
Durability was a bit better than the OEM re040. I averaged 8,000 miles on the rear and almost 20,000 miles on the fronts. The rear re040 were bald at 7,000 miles. (Dual street/track use).
Since I now have a set of dedicated track wheels (255/40R17 – 275/40R17 Toyo RA1 on 17x9 – 17x10 5Zigen FN01R-C rims) I went for a slightly less aggressive street tire that would work well in the wet. I have a set of KDW2 in 235/40R18 and 255/40R18. Very impressive in the rain. I have no problems hitting puddles going 75 mph. Not as grippy as the Azenis, they also have a tendency to squeal when cold.
I miss the dry grip of the Azenis, and the responsiveness of the stiff sidewall. But being able to appreciate my Z in the rain is something I had to compromise for.
They get pretty hairy in the wet once you reach the 50% wear mark. Not for rainy days.
Durability was a bit better than the OEM re040. I averaged 8,000 miles on the rear and almost 20,000 miles on the fronts. The rear re040 were bald at 7,000 miles. (Dual street/track use).
Since I now have a set of dedicated track wheels (255/40R17 – 275/40R17 Toyo RA1 on 17x9 – 17x10 5Zigen FN01R-C rims) I went for a slightly less aggressive street tire that would work well in the wet. I have a set of KDW2 in 235/40R18 and 255/40R18. Very impressive in the rain. I have no problems hitting puddles going 75 mph. Not as grippy as the Azenis, they also have a tendency to squeal when cold.
I miss the dry grip of the Azenis, and the responsiveness of the stiff sidewall. But being able to appreciate my Z in the rain is something I had to compromise for.
10-10-2006, 10:08 AM
#20
Oh, forgot about the impact on handling…
It’s hard to say. I don’t push the car much while driving on the street. “Street-Fast” feels so slow once you’ve driven on a road course race track, I don’t even bother to try to match the dynamics.
The car still has a slight understeer into it. Which is good in adverse weather. Still plenty of tail action is possible to compensate if you time your throttle inputs right. Grip levels are much higher than with the re040 of course.
It’s hard to say. I don’t push the car much while driving on the street. “Street-Fast” feels so slow once you’ve driven on a road course race track, I don’t even bother to try to match the dynamics.
The car still has a slight understeer into it. Which is good in adverse weather. Still plenty of tail action is possible to compensate if you time your throttle inputs right. Grip levels are much higher than with the re040 of course.
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