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Either change tyre diameter or take the speedo out and change the calibration resistor in the back of the speedo.

HPI magazine had an article on it a couple of issues ago on their R33 GTS 4 door with RB26DETT project.

haha umine is the same deal as you but everytime i hit boost the 'hundred thousand' number move... hahah so basically i go thru about 200,000kms a week :)

really do need to get that replaced lol..

its good in a way having it 10km/h up from wat it really is.. cause i find myself not speednig at all cause it already loooks like i am haha

not true having a uncalibrated spedo is a fine aswell!

dont kno if u loose demrit ppoints tho.. doubt it

Yes but if you are 10kmh under the speedlimit. Good luck getting pulled over!

haha umine is the same deal as you but everytime i hit boost the 'hundred thousand' number move... hahah so basically i go thru about 200,000kms a week :D

really do need to get that replaced lol..

its good in a way having it 10km/h up from wat it really is.. cause i find myself not speednig at all cause it already loooks like i am haha

hahaha

i am pretty sure that jaycar makes an inline circuit kit to recalibrate your speedo. that's all the details i have though.

Yeah, they do - catch is you've gotta be handy with a soldering iron, it's a DIY thing.

  • 2 months later...

old thread, i know, but rather than risk a "use the search button" warning, i'll just add on here.

I had a GPS and a friend in my car (borrowed both, i have no friends).

He was watching the GPS screen for speed readout. Apparently, this unit updates 5 times per second, so i assume it's accurate.

At 60kph on speedo, the GPS stated 65kph.

At 110kph on speedo, the GPS stated 112kph.

This sounds backwards, does it not?

I have 18's on my car. And i assumed my speedo would be out a little.

But it looks to me as if the speedo/needle isnt really accurate, or the error/difference would have increased at higher speeds.

How have you guys found your R33 speedos to be?

I have 3 spedos in my car - stock gtr cluster (in a s1 gts), blitz r-vit (consult connector style display unit) and gps. They all fluctuate... i assume the consult readout is the most accurate but the gps in particular can read anywhere from 90 - 110kph when the cluster reads 97 and the consult readout is 100kph..

i think it depends on how good the signal is at the time... if i'm crusing at a constant speed (well constant according to my other 2 spedos lol) it still fluctuates maybe 5kph?? I have a navman icn-320 if that helps (basic model one)

hmmmm, so it may be the GPS that is out?

I thought those things were very accurate.

the most accurate way to measure your speedo differential is to actually do the math.

RPM through gears into the diff with the Tyre/Wheel radius.

the ADR's allow for a 10% error in the Speedometer accuracy - ADR18

although the police do not seem to recognise this - specifically in victoria (3km/h over can and will get you a ticket..)

I have a "Road Angle" which is a form of GPS unit that stores the location of all fixed speed cameras, red light cameras etc etc and it also provides accurate speed readouts.

I would suggest that the accuracy of your speedo all comes down to your tyre size. I run a R33 GTR V-Spec and a R33 GTS-T Series II and the speedo readings are the same in each car for the same tyre size.

Exact Speedo reading = overall diameter of 651 mm

Typical Sizes :

275/30ZR19

275/35ZR18

245/40ZR18

245/45ZR17

5% over registration = speedo 105 and actual 100 = overall diameter 643

Typical Sizes :

265/30ZR19

265/35ZR18

235/40ZR18

235/45ZR17

11% over registration = speedo 111 and actual 100 = overall diameter 633

Typical Sizes :

225/50ZR16

well this is mine

5% over registration = speedo 105 and actual 100 = overall diameter 643

Typical Sizes :

265/30ZR19

265/35ZR18

235/40ZR18

235/45ZR17

but the gps was stating 112 at speedo-110, 65 at speedo-60.

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