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Old 08-03-2011, 05:50 PM   #1 (permalink)
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The Q Sold - '02 Infiniti Q45 Sport
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New tires - size up!

I went into to RADIAL TIRES of SACRAMENTO this morning after researching sizes this past weekend.

Background:
THe 02 Q45 Sport came from the factory w/245/45/18 (26.5 inch diameter)on 18x7.5 alloy rims.
At 60k miles I went to a 255/45/18 (27.0" diameter)

The base of the Strut tower on the front is the limiting factor to how tall a tire can be without using 30mm spacers( BAD)


We tried a 245/50/18 and there is an 1/8 inch gap!!!

THe diameter is 27.7 inches.
The tire weighs 31lb and the current size weighs 30 lbs.

They ordered them today and will install tomorrow.

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MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938

Last edited by mcrews; 08-03-2011 at 07:34 PM..
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Old 08-03-2011, 06:41 PM   #2 (permalink)
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You could cut off the spring platform and fit threaded sleeves so you can fit 2.5" diameter springs
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Old 08-04-2011, 03:47 PM   #3 (permalink)
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The Q Sold - '02 Infiniti Q45 Sport
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Got the tires on today.
new 245/50/18 27.7" dia. at 55mph 1625rpms
old 255/45/18 27.0 dia at 55 mph 1725rpms

will do mpg runs in a day or so.
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MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 09-05-2011, 11:30 PM   #4 (permalink)
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90 day: 23.08 mpg (US)

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as you can see there is no more room!!!

talk about cutting it close!!!
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MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 09-06-2011, 12:09 AM   #5 (permalink)
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...do you think there's "contact" when driving at high speeds and centrifugal forces are attempting to "enlarge" the wheel diameter?
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Old 09-06-2011, 10:08 AM   #6 (permalink)
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If you install coilover suspension you dont need so big spacers to get more room. Or change you ET on your wheels.
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Old 09-15-2011, 02:46 PM   #7 (permalink)
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The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

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Quote:
Originally Posted by Old Tele man View Post
...do you think there's "contact" when driving at high speeds and centrifugal forces are attempting to "enlarge" the wheel diameter?
Well, it's been a month. Had a round trip from Sacramento to LA.....450 miles each way.
No problem with any rubbing.

I had some obdII codes that I had to resolve. And am still addressing some ecu issues pior to my TTT (trip to texas) on Oct 12.

But I just ran a brief highway run.

At 63mph 1775rpms got 30.9mpg (didnot have the grill block or the front underbelly panel in place)

epa is 22mpg highway.
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MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 09-15-2011, 06:20 PM   #8 (permalink)
...beats walking...
 
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...cars need an "electronic" wheel diameter compensation "box" to allow for use of different diameter wheels & tires!
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Old 09-16-2011, 12:38 AM   #9 (permalink)
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The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
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somebody was posting that in europe it's illegal to go up or down in size........
I run a garmin gps on the dash right above the scangauge, so it gives the correct speed.
That way I don't tie up one of the 4 displays on the scangauge.
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MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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Old 09-16-2011, 12:40 AM   #10 (permalink)
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Location: Texas
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The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 659 Times in 474 Posts
Quote:
Originally Posted by Vekke View Post
If you install coilover suspension you dont need so big spacers to get more room. Or change you ET on your wheels.
Why would I want to ruin the electronic suspenion........

__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938
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