i have change my original GTi Mk3 97 alloys with 17" 215/40/83. how much (APPROX) by will the speedo by inaccurate?? will the car accelerate faster?
less acc but in theory more top end! same as how gear ratios work! smaller cog means gets up 2 speed faster but cannot travel as fast as the bigger cog! and they look mint 2
whats wrong with what was said there? the speed shown on your speedo would be the same or slower, but the actual speed would be faster. Assuming that your engine could pull you that fast, which it probably couldnt. Oh thats what you meant!
yes it is! same as ratios on a motorbike box! u go for a smaller front sprocket it gives u more acc but instead of say 1st cuttin off at 15mph it cuts off at 10mph if u go bigger it will pull to 20mph but take much longer 2 get there than a 2 gear change
yeah the difference is changing it at the wheel end will change the road speed but not the amount of rotations, which is what the speedo counts, so speedo will read the same for a different road speed. it does depend on what tyres you run as well though, because the wheel size is irrelavant, its all in the ovrall rolling radius of the wheel / tyre.
the top speed of a car is rarely imposed by gearing - its a function of aerodynamics and engine power output. it is true that in certain hypothetical situations the proposition that bigger wheels will allow you to go faster holds, but in those situations you'd have to say that the car had an inappropriate gearbox - not wheels that were too small. it definitely isn't the case that a small cog can't turn as fast as a big cog. its all down to the machine that's doing the turning.
were all arguing the same point here I think - on the same machine, a smaller cog or wheel will accelerate faster but have travelled less in the time it takes to go round, so the speed wil be lower. that is why you have a gearbox, right?
the top speed is therefore determined by either; the maximum revs the engine can turn (due to engine internal factors) and the gear ratio (inc. the size of the wheels) or by the force resisting acceleration (i.e air and road drag) in relation to the force being output by the engine.
i don't think any of the 8v had 15" wheels as standard. i thought they were an option to the valvers and standard on the g60s??? i think the standard was 185/60/14, like jeff said.
check this site, you just put in what your standard wheel and tyre size is then what upgrade you want to go for, and it will tell you what the speed difference is. http://www.1010tires.com/tiresizecalculator.asp[/URL]
