turbing housing??? .82 a/r

[wild_maxx]

i just got this turbo and he included a .82 a/r housing with it. stock it has the .42 a/r housing on it. What will change if i put the .82 a/r turbing housing on?

[klattr1]

it looks like the old one is a .48 ar.

what size compressor are u running?

i imagine that .82 ar housing will act as a .82 ar housing if the turbine wheel inducer size is consistent for what they were designed for. but if the compressor is small, i dont see a huge advantage.

[wild_maxx]

that kinda confuses me, the compressor housing has a .42 a/r on it. should i just stay with the .48 a/r turbine housing?

[nissanfanatic]

Yes. Upgrading turbine housing and not compressor housing only relocates the bottleneck. Everything works as a system. A system is only as efficient as its least efficient part. You should focus on upgrading the entire turbo.

[wild_maxx]

i am using this turbo for the winter. on the next built motor i will upgrade the turbo

[C-Kwik]

It looks like the 0.82 A/R housing you have was designed to work woth a larger trim turbine wheel. Having a larger A/R coupled with such an oversized housing will present more inefficiencies as a lot of air will blow right past the turbine wheel. The turbine housing should just clear teh turbine wheel blades ideally.

As far as the compressor being a bottleneck...not true. Compressor A/R's have very little effect on overall turbo performance. Compressor trim is going to be vastly more important than A/R. Actually efficiency of the compressor is purely a function of boost vs flow and how it relates to the compressor map. Turbines also have an efficiency curve, but I have yet to really understand this myself as there is very little info out there about this. But in the big picture, the ideal set-up is to match the turbine and compressor efficiencies up relative to where you want the most efficiency to land during driving.