fg built zf box problems

[Nitro_420]

hey all,

recently had my zf box built with new convertor, exedy stage 1 friction kit, bronze bush kit, oversize pressure regulator, new steels and a new clutch e pressure plate etc.

I've noticed my speedo is now reading out, at 40kmh it reads 50 and getting up to 100 it reads 80 on the speedo. the zf has previously had a tune and im thinking will it need a retune on the box to sort my speedo out or have I got other problems? 

I've already tried returning the tune to stock on xcal 3 and reloading the tune in hope it might fix the problem but no good.

any help appreciated thanks 

[Puffwagon]

You haven't changed wheels by any chance?

 

Just take it back to the tuner and politely ask them to fix the job you paid for.

[Nitro_420]

na haven't changed the wheels.

 

guess ill have to give them a call tuesday then, thanks

[Puffwagon]

All good. It should just be tune related and can be fixed fairly quickly. It might help to measure the circumference of your rear tyre so the tuner has that info to double check stuff.

[Nitro_420]

Hoping it's just tune related and I haven't broken something else haha. Just odd that the speedo doesn't read the same speed consistently wrong, it gets more inaccurate the faster I go 

[Puffwagon]

  On 16/04/2017 at 12:23 PM, Nitro_420 said:

I've noticed my speedo is now reading out, at 40kmh it reads 50 and getting up to 100 it reads 80 on the speedo.

Expand  

 

That looks like 20% to me. 

 

Just reading your initial post again it looks like you had a stock trans with a tune and then got it rebuilt without a retune? 

 

I think I may have incorrectly assumed you had it tuned after the rebuild.

 

If this is the case then you should get it tuned for the hard parts as well as checking the speedo issue. 

[bossmang]

your tuner can re calibrate the speedo problem

 

yet I dont see how building the box does that but im happy to be told otherwise. first ive heard of that happening. weird.

 

if you had your box built generally your tuner should re tune the shifts anyways to take advantage of everything. whos the tuner/

[4321]

This is odd, the speed signal is picked up from the wheels through the abs?

[bossmang]

yep that's why when changing to bigger wheels it throws out the speedo. usually around 5 kays or so.

 

possibly faulty sensor? but tune can     fix it                             

[Nitro_420]

Yes originally had the box tuned and then when I had the box put back in I don't believe it was re tuned as I took it to a transmission specialist which is probably where I went wrong.