fuel consumption??

[arnoldlog1]

I've just fitted some new style r32 alloys to my gt tdi 130, but my fuel consumption has dropped by at least 10 mpg(sometimes 15). any ideas why?? I bought the wheels from wheelbase and fitted them myself is it because they need tracking?? the wheels are slightly wider does that make a difference?

any help greatly received

ps they look cool tho 

[Rhyso]

think about it;

you've fitted LARGER wheels. therefore you have more rolling resistance and therefore you need more energy to move 

get some pics up then 

[arnoldlog1]

yeah OK i get Ur point 

I'll take some pics at the weekend whens its clean and get them posted

[Stu-1.8T]

I wouldn't of thought changing the wheels would make you lose 10-15 mpg. Could it be that the computer is not calibrated for the larger wheels or something?? 

[Rhyso]

bigger wheels also  = more weight!

replica wheels are notorious for being very heavy (only assuming the orginal poster has replicas) but even geniune R32 alloys will be heavier than the standard alloys

bigger wheels + more weight = more fuel consumption.

[arnoldlog1]

maybe not 15 but definetly 8 to 10 ish mpg loss, i'm not 2 upset about, because i don't do loads of miles, and they do look good. 

just need to get it lower now, and remap it then i'll be happy!!!


pics coming soon 

[GazB]

I would not of thought 8 - 10, I got genuine R32 wheels on mine and it still reads 50mpg+ on a run

[charri42]

bear in mind if the rolling circumference is bigger (which it will be on 18's) you are travelling further than your car thinks! - hence mpg perhaps better than reading.

[Stu-1.8T]

bear in mind if the rolling circumference is bigger (which it will be on 18's) you are travelling further than your car thinks! - hence mpg perhaps better than reading.

Yes, that's what I meant, but you have wrote it betta aint ya. :embarassed:

[Flipmode]

u shouldn't be losing that much mpg, i went from 16" to 18" and lost about 2mpg at most, get the tracking done anyway.