whats your average revs on your 8 Valver?

[Overseer]

^ if you're talking about diff between mine and his.. then its expected as mine is a valver and his ain't

i'd be interested to see figures from a MK2 1.8T conversion since they use the MK3 gear box.

[bampotman]

I'm gonna get my mate to check his speeds at 2K and see the difference if any. This things confusing me. I've taken the car to 130mph and thats max speed and nearly redlining as it should be so why does it rev 500rpm more than others at lower speeds.

[Overseer]

Whats the redline on an 8v? on a valver its something like 7200 RPM.


because the gearing is exponential you can work out your top speed from lower revs for the same gear.

for example, using my figures..

2000 RPM in 5th =  45 ish

therefore..

4000 RPM in 5th =  90 ish

6000 RPM in 5th =  135 ish  (i think its more like 130.. )

mine flat out has been in between 135 and 140 on the clock.. with more "rev's" left..


i just realised something else...

do you or your mate have different wheels? they'll mess up the speedo readout if wrong..

[bampotman]

I think the redline on an 8 valve is 6200rpm or something around there. Its been a while since I took the car to 130 but I remember it was near the redline (6K ) and I must have been doing about 130 - 135.

My mate has got 17" wheels on his car which could explain a difference in speed and revs as i've got the standard 15's

[Bazzer]

Dunno if the wheels should make that much difference if there are low profile tyres on the 17s? I can understand the size of the wheel making a difference to the speedo reading, that's obvious - but when you put bigger wheels on you generally put smaller profile tyres so the outside diameter of the tyre will be about the same. I can understand a small difference, but not 15-20 mph?!

What do you guys think - am I currrazy or do you think it's right? 

[Overseer]

yeah you're right... thats what i meant.. maybe one car has wrong wheels/tyres

[bampotman]

They are low profile 17's so I would have thought that they would not make much of a difference. Bazzer you said that your mk3 revs at 3500rpm at 80 as well. Have you got the standard 15's still on the car?

[Bazzer]

Yep, dunno what profile the tyres are though and it's chucking down outsite so I'm not checking atm!!    Perhaps after breakfast I'll go check. I thought they were 205 50 15s but I can't remember......

[Bazzer]

Yep, 205 50 15. And the tyres are all new so the circumference is 'book'. Obviously when the tyres are worn a bit, it'll make a difference 

[bampotman]

My mate checked his out and got the following

2000 RPM in 1st =  12
2000 RPM in 2nd = 20
2000 RPM in 3rd =  30
2000 RPM in 4th =  40
2000 RPM in 5th =  48

compaired to my figures below

2000 RPM in 1st =  10
2000 RPM in 2nd = 15
2000 RPM in 3rd =  25
2000 RPM in 4th =  33
2000 RPM in 5th =  40

Theres a big difference there. I don't know whats going on. I'm thinking that a previous owner adjusted the gear ratios. Any other ideas?