Tommy Kaira 25R Digital Meter Cluster

Pic 1: Tommy Kaira 25R Digital Meter Cluster

Ever since I got the ER34, I've been looking for the Tommy Kaira 25R Digital Meter Cluster. It's basically a stock meter cluster but embedded in it is the speedometer in digital format instead of an analogue dial. In addition, it also have warning lights to indicate "Peak Torque" and "Shift Up Point".

As you can imagine, this meter cluster is as rare as hen's teeth! These were only found in Tommy Kaira 25R. And only 163 units were ever made. From this number it is again divided in to automatic transmission and manual transmission version. During the course of these few years, I've managed to track down a couple of automatic transmission meter cluster but not the manual version until now. And boy does it cost me! Paid mighty good money for it.

Pic 2: Tommy Kaira 25R Digital Meter Cluster

Actually I've also gone to the extend of requesting Tommy Kaira to produce the meter but they rather not entertain my request unfortunately. 

  

Anyway, when the Tommy Kaira 25R Digital Meter Cluster arrived, I got it fitted onto the ER34. Looks good but one major issue. The calibration is totally off. It's reading perhaps around 4 times the actual speed. And I hit the speed limit of the meter cluster easily, at a speedy 400km/h. :P

There are some work around ways to this after consulting a mate in Australia that have had the same issue. I'll need to sent it to a instrument specialist. They will hook up the meter cluster to two devices called SINE Wave Electronic Ratio Box. One each for the speed reading and  the odometer reading. 

Before I courier down my meter to those guys in Australia, I looked around my part of the world and thankfully, a friend here can get it done for me. And I do not need those SINE Wave Electronic Ratio Box. The Tommy Kaira 25R Digital Meter Cluster will be worked on directly. The meter cluster was disassembled and long story short, I got it back after a couple of months. It's working great!

Pic 3: Tommy Kaira 25R Digital Meter Being Worked On


Pic 4: Tommy Kaira 25R Digital Meter Being Worked On 

Here is how it looks fitted in.

Pic 5: Tommy Kaira 25R Digital Meter Cluster Fitted In

Speedometer error with the new wheel/tyre ??

Since many people asked me about the accuracy of the speedometer after installation of the new wheels and tyres, I append the below calculation for those who are interested.

FRONT
Current wheel/tyre size : 225/45/17
New wheel/tyre size : 225/40/18

Current Radius : 317.15mm
New Radius : 318.6mm

Current circumference : 1992.71mm
New circumference : 2001.82mm

Difference in circumference : 9.11mm or 0.46%
So when the speedometer reads 100km/h , I'm actually travelling at 100.5km/h


REAR
Current wheel/tyre size : 225/45/17
New wheel/tyre size : 255/35/18

Current Radius : 317.15mm
New Radius : 317.85mm

Current circumference : 1992.71mm
New circumference : 1997.11mm

Difference in circumference : 4.4mm or 0.22%
So when the speedometer reads 100km/h, I'm actually travelling at 100.2km/h


As you can see, the difference is really minimal. Thus for those ER34 owners out there that intends to up size their wheels, you can be assured to follow the size I had on mine.

Hope this helps!! :)