a little help for a stupid question

[brundish24]

no mate not yet prob tuesday.

[Jono FD3]

The converters are never acurate! Actualy all MPH speedos are incorrect! if you plug in a sat nav in to any car with an MPH speedo, they will all over read on the dash! simple reason is it gives you some tolerance with speed cameras etc! don\'t ask me why this is so!! If you took out the converter, the speedo would be bang on but in Kmh!

Jono

[brundish24]

if i took off the converter and got a uk spec one would it be limited to 112mph.

[rx-dave]

The converters are never acurate! Actualy all MPH speedos are incorrect! if you plug in a sat nav in to any car with an MPH speedo, they will all over read on the dash! simple reason is it gives you some tolerance with speed cameras etc! don\'t ask me why this is so!! If you took out the converter, the speedo would be bang on but in Kmh!
 
Jono

I used to do a lot of work for an SVA company and at a speed test you were allowed to be around 18MPH out as long as the speed showed say 70mph and the car was travelling under.....mad or what!!
One of my Subaru Imprezas was actually bang on the target in every speed test such as 30 / 50 / & 70 and they were going to fail me as the speedo should have read higher than the actual speed :Viking.
I think the speedo restrictor for the RX7 is either in or also in the factory settings on the ECU but there are far more qualified people on here that\'ll let you know.
Dave.

[jetpilot]

Personally i would ask a tuner very nicely if you could borrow their rolling road for 5 mins or at least incorporate your needle move with a tunning session.

MOT does not test speedo accuracy only sva.

[trotter]

you put bigger wheels on by any chance? that would throw it out as well

graeme

[jackaleks]

running a car while it\'s up on stands just sounds so unbelievably dumb. if you have a proper post ramp then do it, but if it falls off the stands there is no way you will be on the brakes quick enough.

[DR SCHNITZEL]

The safest way.Just jack one rear wheel up and do it on that. on the rev limiter that one wheel will be doing about 380 mph (yummy). safety first though. It is advisable to put a massive tray of marbles and ball bearings under the raised wheel. then if it falls off the jack the balls will stop the car lunging forward.

[Bobbit]

Doubt ball bearings/marbles would be a sensible thing to do as you could end up shooting them out the back wheel like bullets

[DR SCHNITZEL]

Doubt ball bearings/marbles would be a sensible thing to do as you could end up shooting them out the back wheel like bullets

no mate it will be sound :Thumbs-up trust me.

[jackaleks]

[brundish24]

[dthebuk]

wheels under the sills?

[RobMatthews]

how the hell are you gonna know when to stick the needle back on? by your sat nav?

And i doubt the needle just pops off and back on in a different position

If the car is on axel stands the sat nav will read zero anyway lol

Just dont do it!

[brundish24]

im not going to do it but i would use the pfc commander read out not my satnav, the needles do come off but you got to be careful as ive done it befor and put them on wrong but its alsorted as im going to get some new dials.
thanks for the help every one but it was a bit mad thinking to do it tho lol.