Final drives again.

Confused · Post by **Confused** » Tue Sep 13, 2016 12:43 pm

craig_jdm wrote:http://www.jaycar.co.uk/corrector-speed ... e/p/AA0376

That's cheaper than I was expecting... [edit]not once you add the £20 shipping, and the import charges, it's not[/edit] I might just have to get myself one of those now, certainly easier than messing about with Arduinos and making up circuits!

Confused · Post by **Confused** » Tue Sep 13, 2016 12:51 pm

OK, it's still £20 delivery for 2-4 of them...

Post by **Merlin** » Tue Sep 13, 2016 3:45 pm

I have not noticed any difference in speeds with my final drive. I check my speeds against my what GPS performance box records.

craig_jdm · Post by **craig_jdm** » Tue Sep 13, 2016 3:54 pm

the vss gear usually measures wheel speed post final gear I thought therfore it should be the same regardless of the revs so the final drive shouldn't affect the speedo. I have that module I linked to on my impreza as it was off due to wheel size.

Post by **RattyMcClelland** » Tue Sep 13, 2016 5:21 pm

Yes there must be Something wrong.
Mine reads fine too.

Gprs is still the same as to before the final drive on my car just at a higher revs.

Very strange.

However I have no clue on how to adjust the speed.

Confused · Post by **Confused** » Tue Sep 13, 2016 5:26 pm

Yeah, are you *actually* sure that the speedo is now incorrect, verified against a GPS (driving at a constant speed, in a straight line, on a flat road)?

Post by **NafemanNathan** » Tue Sep 13, 2016 6:27 pm

And logically if it was before the gearbox or final drive there would need to be a different conversion for each differently ratio'd gearbox and being it's a pulse (Cheers Confused) it would need to adjust for each gear. Pretty sure that's not the case.

Post by **newkid** » Tue Sep 13, 2016 7:16 pm

Must be my clocks then

Defo out tho when compared to Tom Tom sat nav.

bennyboy · Post by **bennyboy** » Tue Sep 13, 2016 9:53 pm

Is it deffo only since the final drive change?.. My thinking is you had some gearbox work done didn't you, did you have an lsd put in? After my ATR lsd was fitted to my otherwise stock M2F5, I needed to swap the VSS gear over as the speedo was out.
Just a thought.

Post by **newkid** » Tue Sep 13, 2016 11:24 pm

I'm honestly not sure bud. I think it might have been out before but didn't notice as much as now. Going to try other clocks out and see if that helps.