Veyron,

An engine dyno is tough to find in India and even tougher to get time on. Companies like ARAI, Bosch, Cummins, Tata etc have engine dynos, but are completely booked by their own internal projects or customer projects.

I'd recommend going to racing teams here such as red rooster racing, they have a hub dyno that could be hired out for a day. You can map your engine out and possibly tune it by matching the rpm read out by the dyno to the actual rpm of the engine (match the gear ratios).

These dynos are basically braking dynos and do not motor the engine. Motoring is quite helpful as you can map real lower torque regions with ease. PM me if you require any further information.