Gq speedo adjustment

[97_gq_lwb]

Ok this should give you 10% adjustment on your speedo.
The easiest way is to drill a hole in the instrument cluster that lines up with the circled variable resistor
and use a fine tip flat blade screwdriver that fits into the back of it.
Remember to be gentle never apply a lot of pressure or you will break it.
http://i567.photobucket.com/albums/ss117/it250k/patrol012.jpg

[Silver]

thanks 97-gq-lwb.

does it change the odometer as well?

[97_gq_lwb]

Didn't even think to look at that it might do as the odometer feeds off the back of the speedo.

[Robo]

But turn which way and buy how much?.
and how do ya tell if you have achieve the 10% ?.

a certain % on the tacho in a particular gear before and after the adjustment maybe!.

[Robo]

the trip metre will be alright as you can roll and it measures speed and distance only.

Opps thats dumb I mean tacho, .
Dumb shi#

[97_gq_lwb]

It is a variable resistor so it varies roughly 10 % or a few k's they only turn about 300 degrees you would use a gps and turn it slightly until the speedo is more accurate.
The speedo drive is connected to the transfer bascically runs off the rear tailshaft so gears etc have no influence over anything.

[Robo]

all sounds good, thought you may know which way to turn and roughly by how much.
eg from 1 o'clock too 4 o'clock will give you approx required amount.

can you do that maybe and give us an idea to this, for an example please.
Cheers

[MudRunnerTD]

It is a variable resistor so it varies roughly 10 % or a few k's they only turn about 300 degrees you would use a gps and turn it slightly until the speedo is more accurate.
The speedo drive is connected to the transfer bascically runs off the rear tailshaft so gears etc have no influence over anything.


all sounds good, thought you may know which way to turn and roughly by how much.
eg from 1 o'clock too 4 o'clock will give you approx required amount.

can you do that maybe and give us an idea to this, for an example please.
Cheers

Hey Robo, the idea would be to set your GPS or an App on your Phone to measure your speed then do the adjustment while driving on a straight bit of HWY at 100km/h on the Freeway.

When i did mine i took the front off the gauge pod and did the strong arm adjustment to the needle at 100km/h and it worked a treat. 97GQ's way give a bit more mechanical respect to the gauges though ;)

[HammerBuilder]

Awsome I thought in this day n age there should be an easy fix in elctronics as nearly all of them have these adjuster pots these days...

Anyway cheers n thanks for this TonyD

[Robo]

It's probably how they are factory tuned hay!

[vixim]

cheers. though I don't trust myself not to break something, so i'll just have to remember that 60 = 65 and 100=110, or there abouts, with the 33"s on.

[97_gq_lwb]

When i finally get 35's i might do a switch setup pretty easily done adjust it for both sets and mark the positions.
Then take it out of circuit measure the resistance in both and replace it with two resistors one switched for 35's the other for stockers or 3 lol 31 33 35 .

[Robo]

did I read some where.
different drive cogs available think it was case output end of cable.

[97_gq_lwb]

I Posted up some part numbers a while back somewhere will see if i can find them again.

[Robo]

I Posted up some part numbers a while back somewhere will see if i can find them again.

do we know what % difference they achieve per P-No each ?.

[97_gq_lwb]

No but it would be handy to have the info i know i left the td42 4.1 ratio drive in when i did the conversion and it put my speedo out a fair bit.
I then put the rd28 drive in all fixed.
I have the 4.6 diffs and 16 inch factory mags. Next time i am under the car i will count the teeth on the cog .

[Robo]

Hows about some interested parties get involved and start counting teeth to obtain this info.
maybe take some pics and measurements will go a long way also.

[97_gq_lwb]

I just fitted 35's and the speedo is out again i have a different drive cog it was from a patrol with 4.3 diffs i am going to try it i will count the teeth on the old one and the one i am trying see what difference it makes.
Then i'll mess with the adjustment.

[Winnie]

I think I'm gonna get the marks adaptors box. You can switch between two tire sizes. I've got 33 mud tyres and getting 31 road tyres next week so it sounds like the go

Tappa tappa

[97_gq_lwb]

Yeah just buy it from dakota digital http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=126/category_id=287/home_id=59/mode=prod/prd126.htm

[97_gq_lwb]

Well i just swapped the gears i am running 4.6 diffs original cog was 19 teeth with the factory ti mags 265 75 16 tyres and the speedo was spot on.
With the 35's i tried the other gear i had here wich was 17 teeth couldn't believe my luck the speedo is spot on again at 50 and 60 k's so far need a freeway run at 110 yet .
Easy swap takes just a few minutes.

[97_gq_lwb]

Here are the gear part numbers i believe please correct me if this is wrong.
32703-31G15 for 15 teeth last two digits represent the teeth used
a quick reference for 35 inch tyres
4.6 diffs 17 teeth
4.3 diffs 16 teeth
4.1 diffs 15 teeth

Might not be 100% accurate but then again most speedo's never are.

[Winnie]

How do you know what diffs you have? If I called Nissan with the VIN number could they tell me?

Tappa tappa

[97_gq_lwb]

Tag on the firewall hh43 hh46 hh41 hh39 that's if they haven't been changed.
Otherwise mark the yoke and a wheel and measure the rotation of the yoke to one rotation of the wheel.
Pretty straight forward if the yoke turns 4.1 turns to one wheel rotation of the wheel it is a 4.1 diff centre etc.

[97_gq_lwb]

Be great if people that use this could post up their info like diff ratio tyre size and teeth count .

[spektrum]

Hi .. the photobucket image doesn't exist anymore. Did you still have the photo of the resistor?

I bought the Jaycar kit, but would be better if I can achieve the correction with the variable resistor.

Cheers,
Luke


Ok this should give you 10% adjustment on your speedo.
The easiest way is to drill a hole in the instrument cluster that lines up with the circled variable resistor
and use a fine tip flat blade screwdriver that fits into the back of it.
Remember to be gentle never apply a lot of pressure or you will break it.
http://i567.photobucket.com/albums/ss117/it250k/patrol012.jpg

[MC97GQ]

Luke,

Unfortunately 97_gq_lwb, doesn't seem to be on the forum any more, but hopefully someone else might be able to help you out.

Mark

[spektrum]

Thanks Mark.

I think I've found the image on Google cache (pls advise if this is the wrong img). I'll give it a go and see if it's got enough range for 33" tires.

http://i1160.photobucket.com/albums/q494/spektrum426/4x4%20Stuff/GQSpeedoCalibration.jpg

[patroltb42]

good bit of info this helped me out a fair bit no longer need gps to tell me the right speed.

[spektrum]

What size wheel do you have? Does it allow enough adjustment for 33" ?

Did you just use trial/error to set the resistor?


good bit of info this helped me out a fair bit no longer need gps to tell me the right speed.

[patroltb42]

running 33's with 4.1 ratios. trial and error the first time only moved it a small amount anti clockwise and went out further so i went the other way a touch and got it spot on. had the car strapped on a hoist with rear whells off the ground, with my car 100kph by gps in 5th gear it was doing 2100rpm, while car was running i put in 5th gear then wound the idle up until it sat on 2200 and set the speedo at that. dont recomend you try this at home can be a bit of a danger on jack stands

[spektrum]

... dont recomend you try this at home can be a bit of a danger on jack stands

Thanks.

Should be fine if you have the rear on stands and remove the rear wheels.

[patroltb42]

Thanks.

Should be fine if you have the rear on stands and remove the rear wheels.

good thinking there.

[healy]

I had the 4.3s on my rb30 with 31s now got 35s and put 4.6s and I'm about 4ks out it s#its me

[spektrum]

These guys show the installation of the Jaycar Kit ...

http://www.youtube.com/watch?v=bMs7w72QTVM&feature=share&list=ELSQ4TWTlvef4

[spektrum]

I came up with this idea for easier speedo adjustment. I drilled a hole through the cluster inline with the resistor. This way I can adjust it without having to dismantle the cluster. When adjustment is done, just put some sticky tape over the hole to stop dust getting in...

Notice the hole that I drilled into the white plastic housing..
http://i1160.photobucket.com/albums/q494/spektrum426/4x4%20Stuff/20121004_204352.jpg

Now I can adjust the potentiometer without dismantling the cluster...
http://i1160.photobucket.com/albums/q494/spektrum426/4x4%20Stuff/20121004_204533.jpg

I have turned the pot a few degrees clockwise, and test it soon...

[patch697]

Love your work mate........ a simple but brilliant idea....

Cheers

[77gze]

Was it confirmed that it doesnt fix
The odo?

[spektrum]

Was it confirmed that it doesnt fix
The odo?

It didn't have any affect on the ODO. I'm not too fussed as the ODO and Speedo were each out by different percentage. I really only use the ODO for maintenance schedules and can easily calculate the actual values.

Either way I look at it, adjusting the variable resistor is a very easy fix for the speedo. It only needed about 20 degrees in the clockwise direction, for 33" tires.

[oilpond]

My speedo is on strike!

[Gordy]

It didn't have any affect on the ODO. I'm not too fussed as the ODO and Speedo were each out by different percentage. I really only use the ODO for maintenance schedules and can easily calculate the actual values.

Either way I look at it, adjusting the variable resistor is a very easy fix for the speedo. It only needed about 20 degrees in the clockwise direction, for 33" tires.

When you jigger with the resister, is this changing the pulses received from the transducer, therefore will change the speed across the board and not just adjust the needle? does that question make sense?

Gordy

[spektrum]

The resistor only changes the speedo needle.

Works very well and is simple to do.

[Gordy]

Understood,
thank you