NMS Badboy^NUTTER^

When in 5th gear and from 90 mph onwards (coming on boost), as i accelerate hard, the speedo has a fit and goes to zero , but as i back off the throttle goes straight up to the speed again

Doesn't do it in any other gear or when accelerating gently

Anyone got any ideas??

SapphyMike

speedo cable knackered?

my brothers does a similar thing and it appeared to be down to his speedo cable

xr4x4rs

iTrader: (5)

as said its either speedo cable or the speedo drive in the gearbox as i think these are made of plastic like the 4wd and rst

NMS Badboy^NUTTER^

But why would it only happen in 5th gear??

cossy abuser

cos the magnet in the speedo head can't keep up with the cable speed over 90mph, need a new speedo head or magnet

NMS Badboy^NUTTER^

but the speedo is ok at that speed in 4th gear and the car accelerates faster in fourth, so it can't be a case of not keeping up. The only connection i can see between speedo and 5th gear is that the speedo drive is in the tailcasing with 5th gear, but why would that affect the speedo?

JohnnyB

mine does same ish, my speed suffers with the DT's a well

NMS Badboy^NUTTER^

Anyone? i really haven't got a clue

GOT2BZETEC

Cant help but your going ilegaly fast at that point anyway so you dont need a speedo

markk

iTrader: (2)

the mainshaft in the T5 has the speedo drive on it, 5th gear is sat behind teh last taper roller bearing before the speedo worm gear, if you loosing drive to the speedo in 5th id be tempted to get the box looked at before it turns terminal, may well be the bearing is loose,

do you get any noise from the box ? does the clutch work ok ? no oil leaks from the bellhousing area, if the nose/release bearing carrier comes loose at the front of the box teh whole gear train can move forward as this holds the front taper roller in


hth

mark

Karl

Jonno,

I'd suggest trying a new worm drive for the speedo cable in the box first as it must be a mesh problem.

However allthough that may cure the 5th gear speedo problem in the short term as Mark says it does sound like a box problem. The speedo gear is on the output shaft of the box and 5th gear sits outside (i.e.rearward) of the bearing assemblies of both the output and main shaft. This would mean that any bearing movement would probably exagerate any movement in the output shaft when in 5th gear (and hence the speedo drive) and maybe why the speedo drops its reading in 5th.

(This is only a guess mind you as I have'nt come across this exact issue before)

Anonymous

Who needs a speedo

Jonno i hope its fooked all the way to the ring

Sticky.

iTrader: (4)

He'll be behind you anyway Ding, that shonky thing is too slow

Turbosystems

iTrader: (5)

who needs a speedo dingy when the police will tell you exactly what speed you are doing. Just part of the service they offer for a very large fee

Anonymous

Tony - you had all your cars calibrated then when you change all the running component's You da man.......

Turbosystems

iTrader: (5)

no dingy i was hoping the police would do that for me roflol give up waiting for them after 10 years useless people so i parked it in the air

Anonymous

Not sure why your sticking ya tongue out mate - its your car that don't work

Turbosystems

iTrader: (5)

dingy it actualy works fine i just choose to use something more modern and road friendly at the moment so have one of these

NMS Badboy^NUTTER^

In your dreams


And cheers markk and karl

Looks like it's box out 2mrw then