Top speed

[houston]

Most 6spd boxes use 6th as a overdrive, top speed is reached in 5th.

exactly 

[Grand Master Patch]

how? youve just said the thoretical top speed of a 5 speed box is 160mph, yet the actual top speed is 135, therefore the engine doesnt reach its maximum revs, fitting a 6 speed box would drop the revs needed for the same speed, but this could actually lower the top speed if the torque is reduced, not sure where the 1.8t lies with this.

i saw it with my old fiesta 1.0, had a 4speed box and managed 90mph (private test track ) fitted a 5 speed box and it wouldnt even reach 80

It's just not sinking in with you is it

What was the mph/rpm ratio of the fiesta box's? Without knowing those it's a flawed argument.

Here are the simple facts for you again......................
The 02J 5 speed box 23.9/1000rpm and gives a top speed of 160.13mph@6700rpm
The 02M 6speed box is 24.6/1000rpm with a top speed of 164.82@6700rpm.

Lets take a simple stage one mapped AGU that will easily reach the rev limit in fifth,stick an 02M box on there and the top speed would increase.Testing this out on the highway would be both stupid and dangerous,but it would be faster.

Can i ask where you get a top speed of 135mph from?

[houston]

i read 138mph earlier in thread but for some reason i wrote 135?

dunno what the fiesta box was, that was back in my days of bodging and believing what the scrap yard owner tells me, lol, cant even tell you what revs it was at cos it had a clock instead!

i do not believe that a mapped 1.8t would reach the rev limit in 5th, that is my main argument, read what shakey says on page 1, 137mph and it was reaching its plateu even after a remap, of course if it could reach the limit then the 6 speed would be faster.