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

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

they are both twin scroll

[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.

[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

[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.

[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

The S5 has 2 wastegate holes. S4 has 1.



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

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

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



kevin.

[quote name='teknics' date='May 19 2005, 02:38 PM']the s4 is ht-18, s5 is hx-18.



kevin.


[/quote]



No they're not. Sorry for not clarifying.



S4= HT-18S

S5= HT-18S 2S



But they are still both HT-18's, the S5 is just a revised version of the S4. Just like the 13bt, and 13b-rew. Same ****, minor differences.



BTW it's equivalent to a small T4, large T3.

On my old computer I had a compressor map for it, not anymore..



The turbine a/r of series 5 is; 0.5