Speedometer Error

4GTuner

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EVO-00X said:
Your speedo gears are different. Unbolt it from the top of the gearbox and pull it out. Count the number of teeth on it.
Here's a pic of GSR, EVO I-III speedo gears.

Below I have listed the number of teeth found on the RVR/Spacewagon variations:
The N23W has 28 teeth. One early model has 29 teeth which was manufactured Jan 91 to Aug 92. The rest had 28 teeth up to 1997.
The N23WG has 27 teeth.
The N43W has 29 teeth.

Woah! Will definitely check on this! Thanks mate! Will give you an update!
 
EVO-00X said:
Ahhh yes, thanks for the info about the stock sizes.

Overall tyre diameter.
185/70/14 = 615mm
205/65/14 = 622mm
195/65/15 = 634.5mm
215/65/15 = 661mm
235/45/17 = 643mm

The 215/65/15 is larger than the acceptable 15mm difference in overall diameter and technically contravenes ADR unless you get your speedo recalibrated or change your overall outside tyre diameter. Yes it will throw your speedo out a fair bit.
Go for a wheel/tyre combination similar to stock to maintain speedo accuracy.
The closer you get to the oem figure, the more accurate the speedo will be.
Any excuse to throw on a set of new mags and tyres is a good one!

Here's some info when I was engineering my car:
The overall outside diameter of the wheel and tyre combination must be no more than 15mm over the largest diameter wheel and tyre combination specified for the vehicle and not more than 15mm below the smallest diameter wheel and tyre combination specified for the vehicle.

Manufacturer Overall Outside Diameter measurements as per tyre placards on Lancer Evolution
195/65/15 = 634.5mm 205/60/15 = 627mm 205/55/15 = 605.5mm

Therefore the wheel and tyre combinations allowable under section LS would include, but not be limited to, the following which fall within manufacturer overall diameter specifications:
205/45/16 = 591mm 205/50/16 = 611mm 215/50/16 = 621mm
205/40/17 = 596mm 215/40/17 = 604mm 205/45/17 = 616mm
215/45/17 = 625mm 205/40/18 = 621mm 215/40/18 = 629mm
215/35/18 = 608mm 215/30/19 = 611mm 215/35/19 = 633mm
Will check on this also :)
 
jack of all said:
If he not worried about the speed limit, adr arent goint to even show on the radar.
nice pic btw

Im not worried about the speed limit. In fact, I want to remove my ECU 180km/h speed limit. I just don't know how.
 

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