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Wheels, Tyres, Brakes & Suspension Discuss all wheel related matters

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Old 11-06-2008, 11:52 PM   #46
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Hi

I cant explain why you have had no difference in your economy and am not going to start speculating as to why.

I am only going on my experience. Your experience is different from mine, hey thats fine.

I am only trying to give the poster heads up, and your doing the same.

Best of luck to you.

230k
You too. Could it be related to tyre pressure as previously suggested. I am no tyre expert though.
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Old 11-06-2008, 11:54 PM   #47
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You took out the "how did you get those figures" line, but I responded anyhow..
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Old 11-06-2008, 11:59 PM   #48
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Originally Posted by 230K View Post
Hi

I cant explain why you have had no difference in your economy and am not going to start speculating as to why.

I am only going on my experience. Your experience is different from mine, hey thats fine.

I am only trying to give the poster heads up, and your doing the same.

Best of luck to you.

230k
I cant explain either, but to be honest, I see no difference at all in fuel consumption. Maybe it could be down to motorway miles I am doing compared to others who have had urban driving experience, which I very rarely enconter ?
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Old 12-06-2008, 12:01 AM   #49
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You took out the "how did you get those figures" line, but I responded anyhow..
The edit did not affect my post or your reply
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Old 12-06-2008, 12:05 AM   #50
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I cant explain either, but to be honest, I see no difference at all in fuel consumption. Maybe it could be down to motorway miles I am doing compared to others who have had urban driving experience, which I very rarely enconter ?
The travelling I compared on was motorway travel (Yorkshire-London) and I did experience the drop in MPG. Honestly, I was considering putting the old wheels back on before I sold them, but luckily enough the tinkering sorted it outů
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Old 12-06-2008, 12:08 AM   #51
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The edit did not affect my post or your reply
Not one iota...

Last edited by skymastor; 12-06-2008 at 12:10 AM.
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Old 13-06-2008, 01:41 PM   #52
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If you notice a difference in fuel economy from changing to 18s then I think thats a little sad. Just my opinion but come on whats a few mpg in the grand scheme of things?

I personally can't say I've noticed any difference but they I've never sat down with a calculator to work out my MPG, I thought about, then decided to carry on living my life!

Heres a couple of pics for you:





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Old 13-06-2008, 02:07 PM   #53
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Nice pics BigMac' !!

Jay.

.
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Old 13-06-2008, 02:18 PM   #54
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LOL. He's a modder...don't look at the car, look at his wife/girlfriend....
Head in hands "what am I doing with a man who photographs wheels on old airstrips"

We've all be there, we've all been on the receiving end of that look!!

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Old 13-06-2008, 08:30 PM   #55
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Still reckon it needs to drop a bit at the back

Looking forward to seeing it in the metal soon
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Old 13-06-2008, 10:57 PM   #56
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LOL. He's a modder...don't look at the car, look at his wife/girlfriend....
Head in hands "what am I doing with a man who photographs wheels on old airstrips"

We've all be there, we've all been on the receiving end of that look!!

Haha that is hilarious me and the mrs just had a right chuckle reading that!!
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Old 13-06-2008, 11:07 PM   #57
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Haha that is hilarious me and the mrs just had a right chuckle reading that!!
Hah! I just got a dirty look. Mrs WN has been round this track all too often.
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Old 13-06-2008, 11:47 PM   #58
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Back on topic.
Larger wheels are meant to increase rolling resistance due to the sidewall having less flex so not allowing the tyre tread to deform as readily thus creating more heat within the tyre. Heat is energy so is lost motion.

I don't know whether this is going to happen in all cases but is the theory behind increased consumption on larger wheel sizes.

It's also why lower profile tyres cause a greater tramlining effect.
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Old 13-06-2008, 11:54 PM   #59
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Back on topic.
Larger wheels are meant to increase rolling resistance due to the sidewall having less flex so not allowing the tyre tread to deform as readily thus creating more heat within the tyre. Heat is energy so is lost motion.

I don't know whether this is going to happen in all cases but is the theory behind increased consumption on larger wheel sizes.

It's also why lower profile tyres cause a greater tramlining effect.
Erm,, Creating more heat will increase the inflation pressure and so reduce the amount of flex?

Tramlining will be related to the contact patch and perhaps more importantly the tread depth.

Consumption will be realated to frontal area and drag plus the rolling resistance.. Complicated.....
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Old 14-06-2008, 12:03 AM   #60
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Drove home 250 miles tonight. No difference once again on the 18s. Average MPG this time was slightly better than ussual.
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