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Pics or members with shorter tires?

 
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barnettimpala
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PostPosted: Wed May 25, 2011 11:13 pm    Post subject:  Pics or members with shorter tires? Reply with quote

I'm poking around the idea of going with a 255/40/18, which is about .6" shorter than stock. Anybody got pictures of a slightly shorter tire? Basically one series smaller (245/45/18 - 245/40/18 etc.)

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PostPosted: Thu May 26, 2011 3:46 pm    Post subject:   Reply with quote

.6" smaller will only lower the car by .3" and make the wheelwell look .3" wider. Doubt you can see a difference in a pic.

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habermehl
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PostPosted: Thu May 26, 2011 5:09 pm    Post subject:   Reply with quote

What the purpose or reason? is it style or performance ? why not just do it the "right" way?

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how do the dealer's expect us to get the cars there if they don 't run at all?


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barnettimpala
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PostPosted: Thu May 26, 2011 6:14 pm    Post subject:   Reply with quote

reason is because I was thinking a 255/40/18 would clear the spring mount. Also I think whether it be a 245/40/19 or a 255/40/18, I think 40 series is the perfect amount of tire and 18's are easier to come buy. Plus if I Can find an 18x9, that tire would fit very well. I'm curious if a slightly shorter tire will look better than the norm size lowered

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PostPosted: Thu May 26, 2011 6:16 pm    Post subject:   Reply with quote

I think a tire of that size might be getting close to the range that pisses off the PCM. You might want to look into that a bit more before you seriously consider doing it.

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PostPosted: Thu May 26, 2011 6:49 pm    Post subject:   Reply with quote

i have 245/45/18 i dont hit the spring mount? why would you make things different when there a good workable way to do it? that looks great imo?

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how do the dealer's expect us to get the cars there if they don 't run at all?


Tow Truck?
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barnettimpala
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PostPosted: Thu May 26, 2011 7:27 pm    Post subject:   Reply with quote

habermehl wrote:
i have 245/45/18 i dont hit the spring mount? why would you make things different when there a good workable way to do it? that looks great imo?

The main difference is the width. A 255/40/18 is .6" wider than a 245/45/18. The problem with the width tho, is if it was a 255/45/18, more than likely there would be problems with rubbing the spring perch. I'm not trying to cause massive problems, but I am looking for something different, and I like having a little tire further out than the wheel, not a stretched look at all.

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PostPosted: Thu May 26, 2011 7:31 pm    Post subject:   Reply with quote

Look for "ammofit" i thin his user name is i believe he has tires like that.

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how do the dealer's expect us to get the cars there if they don 't run at all?


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PostPosted: Thu May 26, 2011 8:25 pm    Post subject:   Reply with quote

problem is, you'll be more than an 1" shorter than factory 225/60/16

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PostPosted: Thu May 26, 2011 9:58 pm    Post subject:   Reply with quote

IffyG wrote:
I think a tire of that size might be getting close to the range that pisses off the PCM. You might want to look into that a bit more before you seriously consider doing it.

What exactly do you mean by this? And is there a specific way to know when that would happen?

habermehl wrote:
Look for "ammofit" i thin his user name is i believe he has tires like that.

I found him, amoffitt, but he doesn't say what size of tire he's running and I couldn't find it in the search.

Pitch Black SS wrote:
problem is, you'll be more than an 1" shorter than factory 225/60/16

225/60/16 is 26.6" tall and 255/40/18 is 26" tall?

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PostPosted: Thu May 26, 2011 10:53 pm    Post subject:   Reply with quote

barnettimpala wrote:
Pitch Black SS wrote:
problem is, you'll be more than an 1" shorter than factory 225/60/16

225/60/16 is 26.6" tall and 255/40/18 is 26" tall?


wooops, had the wrong number plugged in my tire calc.

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PostPosted: Thu May 26, 2011 10:56 pm    Post subject:   Reply with quote

barnettimpala wrote:
IffyG wrote:
I think a tire of that size might be getting close to the range that pisses off the PCM. You might want to look into that a bit more before you seriously consider doing it.

What exactly do you mean by this? And is there a specific way to know when that would happen?


The PCM runs calculations based on revolutions of the tires and if you have a different diameter it can screw up shifts among other things. I believe the number they throw around is keep it within 3% of the stock diameter, but personally, I wouldn't run anything that isn't almost dead on to the stock size (unless you ge the PCM tuned for your new tire size).

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PostPosted: Thu May 26, 2011 11:22 pm    Post subject:   Reply with quote

IffyG wrote:
barnettimpala wrote:
IffyG wrote:
I think a tire of that size might be getting close to the range that pisses off the PCM. You might want to look into that a bit more before you seriously consider doing it.

What exactly do you mean by this? And is there a specific way to know when that would happen?


The PCM runs calculations based on revolutions of the tires and if you have a different diameter it can screw up shifts among other things. I believe the number they throw around is keep it within 3% of the stock diameter, but personally, I wouldn't run anything that isn't almost dead on to the stock size (unless you ge the PCM tuned for your new tire size).

Will it mess up anything, or will the speed and shift points just me slightly off? Yeah, 3% is 25.8"

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PostPosted: Fri May 27, 2011 12:25 am    Post subject:   Reply with quote

You'd probably be OK, but I wouldn't want to find out.

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