87rx7TurboII

How much HP could u gain from adding 4 more psi on a stock t2?? What turbo is the 87 TII equipped with?? TD05?

Felix Wankel

You'd have to have a fuel cut defenser first.



Turbo is a Hitachi HT18.

1Revvin7

as longs as we are on this subject; What are the difference between the s4 and s5 stock turbos? And can u put them on different blocks? ie s4turbo on s5 block.

Felix Wankel

Turbine housing, wastegate design, and manifold. If you want to swap one for the other, you need the manifold for it.

1Revvin7

ok, well what about in terms of power delivery are they about identical?

Felix Wankel

Stock for stock its pretty close, but if you pull the twin scroll flapper out of a S4 manifold, the S5 one ***** all over it (S5 ones are fully divided).



My old car had a clipped turbine wheel and removed twin scroll, full boost didn't come on until almost 4000 RPM!



But it felt like it had a lot more power than it really did because it all came on at once

87rx7TurboII

So how much HP can be expected just by adding 4 lbs of boost?? no fuel upgrade

SoniX

possibly a blown up engine

1Revvin7

87rx7TurboII

Hmm.....so ur saying increasing the boost to 8 lbs will blow the motor without fuel upgrades?