Speedo Problems

[Char]

hey all, i have an R32 with RB25 + box.

the revs are fine but speedo tends to sit bout 20k's out. when u hit 100k's+ bout 20-30k's out

took it to workshop on wednesday, its low enough for them to spend 15mins getting pieces of wood for me to drive onto before being able to even fit the jack under

they where un sure as to what the deal was, something was mentinod to me about "cable too tight which is why the speedo changes more when higher speed" then told that isnt the case.

its booked in for next week, n they rekn will probably have to try a bunch of different things to get it sorted.

so R32's run cables while R33's have some kind of electronic system correct?

would something like an apexi RSM be a suitable substitute?

thanks

[bubba]

Yes, R32's have a cable all the way to the dash where it is then converted to a signal the ECU can read.

R33's have an electronic sender on the gearbox.

R32 have a final drive ratio of ~4.3:1 while R33's have a final drive ratio of ~4.1:1, the senders on the gearbox have different toothed cogs to account for this.

Have a search of the forums, there is a LOT of info on putting 25 boxes in 32's and overcoming the speedo problem.

Basically, you start with a Navara sender (comes with a 17T cog) and then swap in a cog that fits/suits.

As I changed my final drive ratio to 3.9:1, I found that the 17T cog on the Navara sender was pretty damn close and would be fine.. it reads 7kmh high which is fine in my books