Hks Rear Housing

[WARLORD]

would anyone know if there is a big or small benefit from a .68 to a .87 rear housing at top end,say if a car is making 320 with a .68 will it benefit from a .87 and how,ive read some stuff about it on sau but just want to know from same people in the know.

thanks

Edited June 30, 2009 by WARLORD

[Lithium]

Depends on the turbo setup, the car etc etc. If you are getting soaring exhaust manifold pressure then you are quite likely to get a good gain - if its all relatively under control then may not be worthwhile. If you are running a .68 housing on a GT30 and making 320wkw then I'd guess you're probably pushing it quite hard, and the .87 may free it up a bit though its really just a semi educated guess.

[WARLORD]

Depends on the turbo setup, the car etc etc. If you are getting soaring exhaust manifold pressure then you are quite likely to get a good gain - if its all relatively under control then may not be worthwhile. If you are running a .68 housing on a GT30 and making 320wkw then I'd guess you're probably pushing it quite hard, and the .87 may free it up a bit though its really just a semi educated guess.

thanks

[WARLORD]

can anyone give me some more input please.

[Pattygtst]

slightly more lag with more kw

[hypergear]

Yes the bigger turbine housing will make more power and better torque, But you lose some response down low. Extra volume will also reduce turbine housing pressure which also allows you to run extra few pound of boost specially for internally gated setups.

[dori34]

Tao, when fitting a bigger rear housing & wheel, do the turbo need to be rebalanced?

[lachlanw]

no

[lachlanw]

oops didnt see you said wheel aswell

[hypergear]

Tao, when fitting a bigger rear housing & wheel, do the turbo need to be rebalanced?

Yea that needs to be pulled apart, have every thing sand blasted and cleaned, then put back together with new seals (new bearings too for sleeve bearing setup).

Once the CHRA is ready then we need to get the right A/R turbine housing and machine that to suit the new turbine wheel.

Not really complicated but little bit of work involved.

[s13_Skyline_inside]

yes you have to get the core balamced if you take the wheel off

[WARLORD]

thanks guys for the input,it looks like hks don't make the rear's any more so i might have to go a top mount set up with external wastgate unless anyone has any ideas