The turbos I have used are both hybrid versions of the stock GT1849V turbo, i.e. the same housings just reworked and different internals. It is not the same as any other turbo on other cars. Those number are just sizes, the model number that defines the turbo is 727477.
The GT1852V was from Turbo Technics and is good for 200+bhp with full boost by 2,200 rpm, picking up from low down so this is a good all rounder for anything from stock to say 220bhp.
The GT1856V I now have is untested, but the even larger compressor wheel should allow me to go up to 250bhp, and not affect low down performance much, if at all. I should note this power level will only be possible with more fuelling, so bigger injectors/injector nozles or lots of meth injection, or both.
Cost wise you're right, now a 136 DCi, hybrid turbo, intercooler upgrades, remap and coilovers can be had for about £3k.
£1200 - £2000 136 DCi (cheapest you might find, they can still go for more if in good nick and low mileage)
£550 TT Hybrid
£250 Intercooler and pipework (ebay stage 1 setup, see technical forums)
£450 RS Tuning remap
£650 Coilovers
The GT1852V was from Turbo Technics and is good for 200+bhp with full boost by 2,200 rpm, picking up from low down so this is a good all rounder for anything from stock to say 220bhp.
The GT1856V I now have is untested, but the even larger compressor wheel should allow me to go up to 250bhp, and not affect low down performance much, if at all. I should note this power level will only be possible with more fuelling, so bigger injectors/injector nozles or lots of meth injection, or both.
Cost wise you're right, now a 136 DCi, hybrid turbo, intercooler upgrades, remap and coilovers can be had for about £3k.
£1200 - £2000 136 DCi (cheapest you might find, they can still go for more if in good nick and low mileage)
£550 TT Hybrid
£250 Intercooler and pipework (ebay stage 1 setup, see technical forums)
£450 RS Tuning remap
£650 Coilovers