Hi Trev,
A recap of your questions :
1. Don’t know what size of a pulley is on my charger. -> Get a ruling caliper and measure one of the five upstanding ribs in the middle where the belt runs on, on the outer diameter of it.
2. Theres a superchip chip fitted to the ECU so I imagine its been upgraded -> Generic modchip. What number does it state on the sticker ?
3. Where do you measure the pulley from -> Pick one of the 5 ribs in the middle and measure the outside diameter of one.
4. Would anyone have a standard chip and pulley for sale -> Have a couple of them over here, if interested. Chips are also selectable. Have a huge library of original and tuned ones.
A original pulley is giving me 79.3 millimeters as of diameter on the outer-ribs where the serpentinebelt runs. Measure up yours and report back please.
A 68mm (max semi-safe pulley to use up to 7000rpm) pulley, measures at the outer ribs in the middle 68mm. Checked it over here.
Hope this helps a bit 
Greetings,
Pvl
]Hi Trev,
Is it possible to measure your pulley up again, as i described from top of the upstanding teeth in the middle of the pulley to the other side of the
upstanding teeth of the pulley,while the belt is off it ? Because thats the only way to get a proper diameter readout.
If you now already measure 66mm, that will clearly not get any bigger than a 65mm or even a 62mm pulley. These pulley-sizes take the
g60-charger over it’s normal limits. This is only for low revs/hi-boost applications. Lower than 6750-7000 rpm max !!!!
for standard internal stuff.
Not to mention the crap that uk-overhaulers call ‘oem’ or oem+’ put in. Let them explain with clear facts on paper, WHY their oem+
stuff is better than the specially designed volkswagen parts that arent for sale at the dealer [] They can’t.
And to be honest, their parts are worse than originally used. They wear out your charger much sooner than the original vw-parts do.
So if you want to preserve your g-charger, i HIGHLY recommend a bigger pulley. A DECENT service, and ofcourse some proper software to go
with that, dialled in to YOUR engine.
Superchips, is just a generic software-producer that only change a few bits here and there in the chip, and in combination with small pulleys,
you’ll run the risk, when the g-charger is in very good condition that you’ll run lean and burn some pistons.
According to this website (http://www.segilu.com/Summer2001/bhp2000/Vw/vwturbo.htm), your chip is made for a vw g60-computer, using the
7246 ending in the bosch-chip-number. To be more specific, it’s boschnumber : 1267357246 (the actual original chip).
Do a google-search on this one, and be amazed, that ONLY corrado’s use this base-chip. Therefore i can safely report to you, that if you don’t
have aircon, you’re missing out on performance, as this chip is for a car with a SMALL intercooler like the golf-g60-aircon or a corrado/passat.
This chip looks great, as of the name presumes, to let you believe it’s the ultimate chip for any g60. But due to multiple car-configurations, 5-10bhp
can be obtained easily, plus some extra torque, due to the fact that cars that have larger intercoolers, can run a bit more ignition pre-advance.
I would recommend a better way, of tuning cars, and use a chip which was written for the car, as a base, and then tune it for all things that
are done to the engine. Camshafts, ported charger, higher compression, bigger bore, different exhaust, all comes into play when dialing in
a car near perfection as of software.
Could you be so kind, to also let me know what mods/options your golf has? Aircon (one of the options perhaps) is very important to state,
as that intercooler (just described) plays a major role. (robs 10bhp, tuned).
Hope to help you out a bit more, and am looking forward to your reply,
Pascal