Vantage V8 gearing

[00Dahn]

A question for those with similar cars please

I have a fairly recently acquired 09 vantage (manual) and its come to my attention that the gearing doesn't seem quite right.

If I rev it to the limiter in 3rd it'll hit ~98mph (GPS says speedo is within ~1mph), but according the specs with 1.44 3rd gear / 3.909 final drive it should do 106mph. The best I have come up with is someone has fitted a later box from 2012> "S" with the 4.18 final drive, but nothing in the service history suggests that...


Am I wrong / are all the specs published wrong and 98 is correct???


any help appreciated

[Calinours]

Does it have 7 automated gears? - If not, then it's not an 'S' transmission (the 7 speed box was also fitted to 'sportshift' equipped non S from 2012).

It's possible someone may have messed with the integrated diff in the 6-speed transaxle I suppose, though that would appear unlikely.

[00Dahn]

Nope, its 6 spd manual.

Its hard to find definitive answer but from a lot of googling it suggests all the Vantage S have that lower final drive.. hopefully someone can shed some light on this for me

[trevalvole]

I presume the size of the wheels/tyres are to AM's specs?

[macdeb]

Revving it to the limiter? Why?

[Nigel_O]

macdeb said:

Revving it to the limiter? Why?

‘Cos it goes faster and sounds better…. ;-)

[Jon39]

Can gearing be measured without dismantling, to count the number of teeth?

[00Dahn]

trevalvole said:

I presume the size of the wheels/tyres are to AM's specs?

yes, 275/35/19 on the back

macdeb said:

Revving it to the limiter? Why?

yeh I know, but because... normally I try to shift before that but eh, its interesting it showed this up

[SlimJim16v]

Jon39 said:

Can gearing be measured without dismantling, to count the number of teeth?

It can be done by turning a wheel or the prop and counting the turns the other makes. It also matters if one or both wheels turn. I can't remember the exact procedure.