me and some friends have been debating this for a while now, so im gonna post it up. how does turbine size effect the compressor maps? for example, is the compressor map the same for a to4e 50 trim with a t4 turbine as a t3 turbine? cause the maps dont specify what the turbine size, and im sure its got to effect wheel rpms and heat and stuff like that. also, how do the compressor maps change between a/r's, like between a .48 and .63 t3 turbine? and wheel size, stage 3 to stage 5? if anyone has any info on this im real curious. thanks

 

Turbine choice doesn't affect compressor efficiency. What turbine sizing does affect is the speed at which the turbine wheel will be efficient at providing shaft torque to turn the comp. wheel.

If you have a really small turbine wheel, it will want to spin fast for a given exhaust mass flowrate. If you saddle that small wheel with a huge compressor wheel(read: almost every turbo choosen by Honda guysl ), then the turbine will be forced to spin slower than it would "like" - so it isn't very efficient at providing shaft torque at your given boost pressure as you rev the engine up. You get increased slip losses, from the exhaust gas just "slipping" past the turbine blades without providing useful work.

Setups with mismatched wheels can still make power, they just don't do it near as efficient as a properly sized setup.

 

up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blackeg &raquo;</TD></TR><TR><TD CLASS="quote">up</TD></TR></TABLE>
You already got your answer.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">
You already got your answer. </TD></TR></TABLE>

true- i guess this is what i get for posting before im fully awake

 

ehh, i'm still confused