Alright folks, I know that the cost would probably make such a thing prohibitive but is there a way to change the gear ratio (either the final drive from the transmission or the fifth gear cog) so that the engine RPM would be more like 2200-2300 at 70 rather than 3000? It's not a dragster anyway but it seems the mileage would improve and the engine would last longer if it reved lower. Any thoughts?

 

Taller tires

 

Can the computer be changed to accept the taller tire size so the speedo is correct? Is it possible thru VagCom?

 

VAGCOM
Radio56-Adaption10-Channel1
56-10-1

{Tire Circumference Table}

Summer Tires

1790 - 145/80 R14
1815 - 165/65 R15
1803 - 175/60 R15
1806 - 185/50 R15
1935 - 195/65 R15
1910 - 205/60 R15
1930 - 205/55 R16
1818 - 205/40 ZR17
1960 - 215/55 R16
2060 - 225/60 R16
1930 - 225/45 R17
2074 - 225/55 R17
1943 - 225/40 ZR18
1960 - 235/50 R16
1964 - 235/45 R17
1967 - 235/40 ZR18
2065 - 245/45 R18
2065 - 245/45 ZR18
1940 - 255/40 R17
1937 - 255/35 R18
1937 - 255/35 ZR18
2016 - 255/40 ZR18
2016 - 255/35 ZR19
2092 - 255/35 ZR20


Winter Tires

1775 - 155/65 R15
1895 - 185/65 R15
1935 - 195/65 R15
1930 - 205/55 R16
1960 - 215/55 R16
2092 - 215/65 R16
2060 - 225/60 R16
1930 - 225/45 R17
2070 - 225/55 R17
1940 - 225/40 R18
2010 - 225/45 R18
2040 - 235/45 R18
2114 - 235/50 R18
1940 - 255/40 R17

See http://en.openobd.org/audi/rns.htm#tires

 

that is some good information. thanks

 

If you compare spec's of the 4.2 allroad tip to a 4.2 S6 tip you will see that the final drive gear ratio's are 3.908:1 for the allroad compared to 2.727 :1 for the S6. thats a huge differance. Can the allroad tranny be modified to the S6 final drive ratio?

 

Taller tires changes a lot of other things though. Looking at the list it appears that the other 17" tires 235/45 and 255/40 have circumferences of 1964 and 1940 respectively. I don't feel like buying new rims, I like the ones I have. I might be reading the chart wrong but it looks like the wider 17" tires are actually shorter?? Also, how large a tire fits before things start to rub? Thanks guys.