hello guys, i'm thinking of selling my hybrid t04e (made 300whp) to go a little bigger. i found a good deal on an HKS log manifold and wastegate and i'm wanting to get a larger t04b or t04e. i seem to have found a great turbo, but i'm thinking the hotside would be too small... i'm looking to make about 350whp MAX so i figure i can get away with a slightly smaller hotside (all the big turbo guys run like 1.0+ from my experience) i was looking for a hotside a/r somewhere in the low 80's, but with my power goals, could i get away with a .68?
here's the turbo:


http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

 

no

 

what about a .96 a/r on a t04b? i found a nice turbo at turbocalculator.com t04b, s-trim compressor, p-trim turbine. 399 bucks but the hotside a/r is .96... too big?

 

anyone?

 

From what I understand, the size of the turbine will dictate where in the RPM range the turbo starts spooling up. Small A/R, lower in the RPMs. Bigger A/R takes longer.

The size of the compressor housing and wheel is where you look to see how much air flow you will get. .96 on the hot side is not too big for a rotary engine.

 

with a 57trim comp and a EX .68 a/r you should reach your goal..just look what you did with your small comp. on you hybrid.

here are some turbos with HP estimates...look at the Comp's and Ex. and then look to see how much hP they make
http://www.sol.co.uk/h/hugh/HKS%20Turbo%20Model.mht

 

The smallest a/r i have heard anyone running successfully on a 13bt is a .81 a/r on a t04b 60-1, the car is setup for autox.

those turbo estimate things are a little deceiving for rotary engines. for example: a buddy of mine runs a t04b 60-1, with a .64 a/r on his 7M powered supra..it makes 480whp at 19psi. I see rotary guys running the same turbo w/a .96 a/r housing and making 380 or so hp at 17psi...

If you can get that one cheap enough, buy it. If it sucks, just swap the hotside housing for a larger one.

 

a .68 a/r exhaust side will totally choke a 13B

 

thats what i thought.

whats the smallest A/R i can run that wont choke my engine and still spool up quickly? no one can give me a straight answer it seems...

 

.68 a/r is too small, you will end up having extra back pressure. I would go with AT least a .89.

 

also, i want to make sure my turbine WHEEL isnt gonna be the cause of any restriction... what trim would yall suggest?

 

That's the downside of a rotary. We don't use air very well. Engine efficiency is actually determined by how many horsepower they make per pounds of air used. A typical piston engine makes about 10hp per pound (not psi) of air where an average rotary only makes about 7hp per pound of air. Knowing this little bit of info helps somewhat in determining proper compressor sizing.

 

so, rotarygod... what turbo (trims and a/r's and family's) would you use with a medium streetport to make the most responsive 320whp?

 

could a .68 exhaust housing with a ptrim wheel REALLY be more of a restriction than the stock housing/wheel ???? i'm only looking for 320whp (and good response) here....

 

Anywhere in the .8X a/r would give you awsome responce and a pretty descent top end without boost trailing off near the end of your powerband, that is depending on your compressor selection.
Good Luck.

 

well, it seems that turbocalculator.com updated their listings? now its these to pick from...
http://www.turbocalculator.com/view-...ct=002-001-101

i want to get the v-trim... where could i get a housing to replace that 1.15 massive hotside?

 

( not to hi jack )

but what is the stock turbo ( s4 or S5 doesnt matter ) hotside considered ?

edit *

to be more specific I mean in AR

 

Aren't those "Stone Racing" eBay turbos? If so, it's been advised that you stay away from those, their housings have a tendency to split in half...

 

no, they are not.