What's the 1.6 gti maximum power ?

i have a '81 1.6 gti . i want to know that whats the maximum power of the 1.6 gti and which mod. i need to do ?   ( turbo or supercharger, forged pistons etc )
Thanks

Turbo or supercharger isn't cost-effective these days because to do it properly costs a lot, and an engine conversion for a 1.8T 20v can work out cheaper.

Forged pistons in themselves don't add power but permit a higher power output reliably, ie from other components. Also if combined with balancing the bottom end allows a higher rpm, which in itself will yield more power (if other things are set up properly).

The problem with modifying the 1.6 (and 1.8, to some extent) is that although you can do mods to add power, it will be at the top end so isn't that useable on the road, but becomes more useful eg track days, drag racing, etc, hence the popularity of engine conversions and bigger capacity (or 'off the shelf - eg 1.8T or G60 - turbo or supercharging).

1.8t conversion isnt legal here (just %30 power increase is legal, this mean 110 + 33=143 ) and i cant write document 1.8t engine vin etc. for this im thinking add power 1.6 engine. thanks for reply..

Where is "here"? I am wondering whether engine conversions are cost effective etc, for example what models of VW and Audi were available in your region over the years.

143bhp - do they take the manufacturer's quoted figure the engine came from eg if an engine conversion?

If its achieved with modifications, how do they know its only a 30% increase? What happens if you do modifications and it results in less power, or hardly any increase? etc

"here" is Turkiye. I searched informations about engine power increase (or conversion ) in laws for few months and result is that
 car color, type ,engine power,vin, etc is wroten in car licence document and when i try a conversion, i need to buy an engine with invoice and licence (even its used engine, need invoice and engine licence from seller) for make it legal and new engine informations is wroten in licence. When i make an application for conversion old and new engine specs are compared (see both engine licence) and power increase percent is calculated and if its more than %30, its not permitted. I know some europan countried that doesnt matter none of this and conversion is very easy. For this add power engine is better than conversion.
which is cost effective - almost same, 1.8t engine, ms ecu, electricity system etc. is almost 3.500-4000 euro. i think you buy all car ( passat or golf 1.8t)  this money.
here all kind of vw and audi cars and parts exist, new or used.
conversion :new engine licence need.
mod: i wont tell ( and they dont know this ) if i mod  and add power.
sorry for bad english. i hope you can understand.
thanks.

Ok maybe someone else can help you on the tuning, I prefer engine conversions.

Thanks Paul, if i change mind and  do conversion even illegal, i'll expect your helping.