My ECU has

[MuffDaddy]

4.3 written in black marker. Does this mean anything?

[domV8]

Most likely you got a fuel map for a 4.3 - possibly a result of Blackpool's usual first-part-to-hand construction method..?!!

Was your a 4.0HC out of interest..?

[Alexdaredevils]

I found the 4.3 was better than 4.0, 4.0hc,4.6 and 5.0 and the tornado chip for my big cammed 4.6

So keep hold of it if you are going to tuned it NA

[davep]

If you've got RoverGauge you can easily check to see what Tune version, Tune resistor and fuel map the car's EMS is running, far more accurate than reading what TVR scribbled on the ECU case label.

[OleVix]

is it possible to copy a chip like this? shouldnt be too hard?

[MuffDaddy]

I don't have rover gauge and have no intention of tuning. Maybe I should get hold of the rover gauge.