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PostPosted: Thu May 22, 2008 4:55 pm 
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Joined: Mon May 12, 2008 9:58 am
Posts: 11
Location: greenville, tx
so how did u recalibrate u’re speedo/ odometer for the taller 14” wheels and tires?

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1998 Chevy Metro
1.0
5spd
with A/C
310483 miles and still counting

2000 F-350 4x4 Drw
7.3 Diesel Auto
Crew Cab
90,000 miles

2002 1500 4x4 Suburban LT
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PostPosted: Thu May 22, 2008 5:05 pm 
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Joined: Wed Dec 07, 2005 5:56 pm
Posts: 379
Location: Tempe, AZ
When I put 14" tires on my mkI turbo I went with a low enough profile that the tire circumference was about 5% off, so not enough to worry about and I left it.

Are you sure the tires you are using really are that much taller?

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PostPosted: Thu May 22, 2008 5:49 pm 
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Joined: Mon May 12, 2008 9:58 am
Posts: 11
Location: greenville, tx
Well I was just wondering, if they aren’t any/that much taller then what’s the point in the fuel mileage end of things?
If they are tall enough to make it worth while then how are u getting accurate mileage to compare with vs stock.
The best I’ve been able to get hwy is 44.7 and that’s driving 55mph no a/c. I can get better than 45 mpg city if kept under 45 mph.
Normal driving I do (65 miles to work 59 of it at speeds of 65 to 75 is 34-37 depending on how hard the wind is blowing)
I drive to work in the am at 65,on the way home it goes 70-75 depending on traffic.
I’m just wondering how to get better mileage as has been reported here.
Also, to those increasing the air pressure in you’re tires how’s the tire wear? I run mine at 35 psi and the center is wearing more than the outside but not by much. I was just wondering about the 40psi +guys.
I do drive smooth and have a good running car that doesn’t use oil, stay in the right lane and am passed more than passing, have a lite foot and shift b 4 the lite comes on.

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Ike

1998 Chevy Metro
1.0
5spd
with A/C
310483 miles and still counting

2000 F-350 4x4 Drw
7.3 Diesel Auto
Crew Cab
90,000 miles

2002 1500 4x4 Suburban LT
76,000 miles


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PostPosted: Thu May 22, 2008 6:32 pm 
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Joined: Wed Dec 07, 2005 5:56 pm
Posts: 379
Location: Tempe, AZ
I have to think that larger wheels is not your answer to better mileage. They are heaver and require much more effort to spin up. Your highway mileage might go up a small amount but in town will suffer significantly. I went with 14" tires for better handling, and as I had expected my mileage went down by a couple even after figuring in the 5% inaccuracy of the speedometer/odometer. A transmission swap or gear change is more likely the answer to your mileage problem.

I always ran about 40, tires always wore evenly. At least I couldnt tell if the center wore more.

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PostPosted: Thu May 22, 2008 6:45 pm 
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Joined: Mon May 12, 2008 9:58 am
Posts: 11
Location: greenville, tx
got most of the info off of the 50+ club...........and wondering???????????/

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Ike

1998 Chevy Metro
1.0
5spd
with A/C
310483 miles and still counting

2000 F-350 4x4 Drw
7.3 Diesel Auto
Crew Cab
90,000 miles

2002 1500 4x4 Suburban LT
76,000 miles


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 Profile  
 
PostPosted: Thu May 22, 2008 6:51 pm 
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Joined: Tue Apr 08, 2008 9:08 pm
Posts: 1254
Location: Ashtabula, Ohio
I run 44 PSI in my tires with no issues and I prefer the skinnier "stock" tires for better fuel mileage and traction. There are lots more tips on fuel economy over at ecomodder.com if you want to find more tweaks for MPG.

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PostPosted: Thu May 22, 2008 10:29 pm 
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Joined: Thu May 15, 2008 6:41 pm
Posts: 44
Location: Santa Barbara, California
The best thing you can do for your MPG is to slow down to 60-65.... as long as it won't mean you're getting run over by traffic. Or if you're attentive, find a big square van to follow somewhat closely and hide in their wake--- but it can be dangerous. If you try that, find one that's keeping a steady speed so you're not always trying to catch up or brake to avoid hitting them since speed changes waste gas. Also, find one that's fairly low to the ground so it blocks the wind at your level (In addition, if you were to hit it, you wouldn't go underneath.)
I swapped over to 155/60/15's (see the 14' Gallant wheels thread) and I'm very very happy with them. They ARE heavier (29 lbs compared to 22 lbs) but since the sidewalls are so much shorter, the feel a lot more stable and safer than the 80s series 12s or 13s. Since they're better tires I feel pretty comfortable running between 40 and 44 psi. So far my mileage seems better, but it's too soon to say. The wheels I ended up with are minutely more aerodynamic than my 12' steelies.
As far as the speedometer goes, I just calculated the percent difference in tire size and use that in calculating mileage and use the same percentage to figure out what 65 mph is going to read as on my speedometer (61mph) and guestimate the rest.
If you do change your wheels and tires, keep them SKINNY!! They make a 145/65/15 that I drool over, but I can't find a wheel that works.... has to be 5 inches wide or less.

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PostPosted: Thu May 22, 2008 11:38 pm 
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Joined: Wed Feb 01, 2006 9:37 pm
Posts: 1009
Location: West "By God" Virginia
used the tire size calculator
speedo off by about 1mph per 10
10mph = 11
20 mph = 22
30 = 33
60 = 66
ect., ect.


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