oneillcharlie

And what a great analogy about sizing turbos 🤣🤣 if only it was that simple . Volumetric flow rate of your engine is the dictating value when speccing a turbo for a car . If your housing is too small you will never flow enough to make desired pressure at high rpm’s

Lol very funny that you think that .Go measure the turbine exducer on an 1856 and you will find it measures in around the 46mm mark . The way garret names its turbos is as follows , the first part GT18 is a nominal number , meaning it doesn’t equate to an exact measurement, it’s just a housing series. Similar to the way a td04 doesn’t have a 4mm turbine haha . Another example would be a gt1749Vb (pd150 turbo) this has a 43mm turbine inducer and a 49mm compressor exducer . You will not find anything measuring 17mm 😂. 17 is just the housing series . Meanwhile an gt1856 from JW used a turbine and shaft from a gt18 turbo , a compressor housing from a gt20 turbo and custom made 56mm compressor . Not sure what the hot side housing is off to be honest . but yeah a lot bigger than a 1756 in every way apart from the size of the compressor wheel and much more capable .

That is a hilariously poor result for such a setup . I have more or less the exact same setup from JW and made 255bhp and 530nm . Everyone I know with this turbo makes similar numbers . From what you’ve said it sounds to be your tuner doesn’t know what he’s talking about . And also for the people saying an 1856 is only slightly bigger than a standard turbo or ever a 1756 don’t know what they are talking about . It’s a much bigger turbo with a housing from a 2052 Audi turbo . So closer to a 2060 than a stock turbo or even 1756.