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Hey I'm new to sau, bought a series 2 R33 Gts-t and I'm wanting to high flow my factory turbo, I've looked through a whole bunch of threads but haven't really found any specific measurements for the diameter of the compressor wheel. I'm fairly sure the stock wheel is 49mm and I'm wondering how much bigger of a wheel can the housing fit? Also I'm unsure of the total height of it, if that makes a difference? Thanks heaps

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I got a turbo highflowed by GCG about 6 years ago for nearly $2k.

Would choose Hypergear today (if I were in Aus - actually have a top turbo man locally) - continuous development, better prices, feedback.

What are your:

a) Goals (ie just a bit more top end power, whilst retaining some low RPM response)

b) Existing supporting mods

c) Budget

Goals power wise I'm looking for some 250+kW at the wheels.

Supporting mods, nothing at the present time apart from 3" cat back exhaust, pod filter, adjustable boost controller. However I do plan on buying splitfire coil packs and new spark plugs. As well as a new ECU, thinking of tuning it to run E85 but since I'm in canberra there's not many places to get it so I'll need it to be able to read both ethanol and octane.

Budget is around 2-3k willing to spend more, just need more time to save the money.

they are two of the main companies well known in skyline community which provides high flow service

there used to be a few more some years back, but they are either out of business or just stopped doing them

there's also precision turbo in Wetherill park NSW that does high flow as well. Having used high flow turbos from all three companies I personally prefer hypergear if you're chasing power on a budget, precision is also good as well but they do cost a little more for their ball bearing high flow, which gives a good balance between power and response,

good thing about hypergear is they are constantly R&D to improve their products like what GTSBoy said, their latest highflow design is a more competitive product than the GCG high flow I think

Goals power wise I'm looking for some 250+kW at the wheels.

Supporting mods, nothing at the present time apart from 3" cat back exhaust, pod filter, adjustable boost controller. However I do plan on buying splitfire coil packs and new spark plugs. As well as a new ECU, thinking of tuning it to run E85 but since I'm in canberra there's not many places to get it so I'll need it to be able to read both ethanol and octane.

Budget is around 2-3k willing to spend more, just need more time to save the money.

If you're replacing the turbo yourself, set aside around $1k for a turbo. The standard r33 high-flow from hypergear is a fairly proven item. I use one as well. Keep in mind you'll probably spend a few hundred more on gaskets and a new set manifold studs and nut kit. (might as well fix the manifold while the turbo is off)

Is your vehicle supported by nistune? If not then you are looking at an aftermarket flex-fuel capable ecu. The cheapest would be an adaptronic e440d. Even if you get that at a good price, with the accessories (air temp sensor, ethanol sensor, loom) you wont have any change from $1.5k

Then factor in +$1k for a GOOD tune, where the tuner has paid attention to partial throttle drivability and fuel consumption. That would be a single tune on one fuel, that wouldn't be a flex tune with runs on 98 & e85.

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