Need help with exhaust housing size

[dirtdiggler666]

Im in need of some ideas on what Exhaust housing would work best with my setup and goals.

The car is used for street and road racing only.

Its a 2JZ VVTi with a BW S257SX-E with a open .96 housing and its falls out of boost really easy around tight slow corners and I would like to see if I can improve that a little.

my options are a .68 open or make a new manifold and run a divided .83 ???

Would the divided be worth the extra cost over the .68 and being a road race car would the small housing make the EGT's to high?

BTW the car is right at 400 hp so not pushing it that hard and won't be going higher on this setup.


If anyone has the knowledge that would be great

[foreverdeath]

The divided .83 is gonna flow much better then the top end then the .63 and spool the same if not better. I would think the .63 would start to choke the motor out on the top end. But then again back in the day the Z31 with the early VG30E-T had a .63 A/R open T3.

I'm about to run the same turbo on my RWD K24A2 s13 with a divided 1.0 housing but I haven't driven it yet so T can't give you any input on how it'll feel.
My last setup was a T3/T4oe .83 open on a KA24DET @350whp it it was about prefect all the way to 7500rpm.

[jedi03]

get the variable turbine to get the best of all worlds!

[SidewaySSS]

Divided would be my choice.
However the cost of a new manifold might not be worth it unless it was a fresh build .
The ,68 open housing might only work for a low boost street cruiser JZ.