newtarx-7

whats the stock turbo size for a TII? does it change from the S4 to S5?

fc3sboy1

yes the s5 is bigger then the s4 by a little bit. also the s4 uses a twinscroll and the s5 does not. not totaly sure on the size though

drftk1d

they are both twin scroll

BoneT2&Harmony

[quote name='fc3sboy1' date='May 17 2005, 05:22 PM']yes the s5 is bigger then the s4 by a little bit. also the s4 uses a twinscroll and the s5 does not. not totaly sure on the size though


[/quote]



They are the same sized turbo, just better flowing manifold and bigger wastegate hole(s).



The reason why the the S5 makes 18 more HP is mainly due to the boost increase.

BoneT2&Harmony

[quote name='drftk1d' date='May 17 2005, 11:45 PM']they are both twin scroll


[/quote]



Not true. S5 are NON twin-scroll. Mazda went with a fully divided manifold for S5

BoneT2&Harmony

[quote name='newtarx-7' date='May 17 2005, 05:20 PM']whats the stock turbo size for a TII? does it change from the S4 to S5?


[/quote]



This is proably in the FAQ, but they are Hitachi HT-18's. Not sure what other turbo it's equivalent to, but its between a T3/T4.



The size doesn't. Manifold, wastegate does.

drftk1d

[quote name='BoneT2&Harmony' date='May 18 2005, 06:00 AM']Not true. S5 are NON twin-scroll. Mazda went with a fully divided manifold for S5


[/quote]



oops. sorry for giving wrong info.



the s5 has two holes for the wastegate right

BoneT2&Harmony

The S5 has 2 wastegate holes. S4 has 1.



But the S4's wastegate can be ported bigger than an S5.

drunkin_idiot

Ya im pretty sure the turbos are equivelent to T3's.

teknics

the s4 is ht-18, s5 is hx-18.



kevin.