like the title says. looking to running 8-12psi mainly and just looking around for what has worked for other people
-Ben Martin

 

My T04B H trim is working well in that range.
Have you looked at any compressor maps?
I think this is old info, but it may be worthwhile reading nontheless:
http://fc3spro.com/TECH/TURBO/compmap.html

 

yeah, hovering around stage 2 bnr which is the h3 trim wheel w/ t04b comp hosuing
also looking at the t04e 60trim wheel which looks very interesting.
-Ben Martin

 

T04B H-Trim, 60-1, T04E 57 and T04E 60-Trim, GT35R, T61, just off the top of my head, I'm sure theres others that other people will name.

~Mike................

 

can the turbo gurus look at that fc3spro.com link in the above post to see if that is acurate? Only reason I'm having doubts is because there are plenty of fc's running t78's and t88 turbos but with the link above it seems that would not be obtainable with a 13b without hitting the surge limmit. Maybe I'm just looking at it wrong.

 

Am I the only one who is completely baffled by this post? What are you asking or trying to say? Maybe I'm having a slow day?

~Mike...............

 

no it's probably me. Most of my days are "slow" What I was asking is if anyone could perhaps validate the data in this link. http://fc3spro.com/TECH/TURBO/compmap.html

 

Ahh, now that makes more sence. I wasen't sure if you meant validate my post using fc3spro or if you were asking others to validate fc3spro.

I'll get back later when I have more time and post a response to your question, but just a quick glance the flow numbers are conservative (which is fine for sharing to the public).

~Mike..........

 

thats the problem I had as well. Everything else looks fine but given those flow numbers any larger size t series turbo would be too big for the rotary witch I know is just wrong.

 

Every engine is different, clearances, how worn the motor is, the port and the compression all have factors on the efficiency of the motor.
EVERY MOTOR IS DIFFERENT
No two are alike, even stock motors that come out right after each other. There will be a difference.

Those are just generalized numbers. Your stock port 8.5:1 motor won't do as much as a bridgeported 9.0:1 motor.

Get the idea?
The only way to really know what your motor flows is to stick it on an engine dyno (the one to measure flywheel horsepower, not rear wheel) and do lots of datalogging and ****.
Everything else is a good guess.
-Ben Martin

 

oh yeah, also forgot the operating rpm and boost make a diff. But those are more drag specific, and they use wildly big turbos. But same sorta stuff.
Just a lotta fancy equations

 

I ran a 35R at around 10-12psi for a few months and it performed very well.

 

T04S is very good too. just stick with a conservative AR on the turbine side

 

Hey Ben, You should speicfy the rpm range since this will play a major role in the compressor size vs. flow rate.

I.e. HT12 is good at the boost level you mentioned from 2krpm - 4.5krpm

HT15 is good at that boost level from 2krpm - 6krpm

etc..

If you want a turbo that has fast spool response and keep up with the flow rate at 8krpm, I would go with a T04E 57trim.

 

The largest map on the site is for a Turbonetics T76, the T78 and T88 are greddy turbos that are not sized the same way, so they are in fact OK with rotary. That Box is drawn is a very rough estimate and more dependent on actual VE and engine RPM as Pluto said above. A very rough guideline only!

 

Steve. I was thinking of wheels for a hybrid s4 turbo for my high comp 13BT.

My interests have been most peaked by t04b h3 compressor, and t04e 60 trim compressors. I only have a faint idea on how to read a compressor map.
I am lost as to what lb/min my motor will want or how this changes by rpm, etc.

I'm looking for very fast spoolup and power that will kick all the way until redline.
Motor is good for 9400rpm, but I think the s5 intake manifold may be my restriction on high rpm power.
I'm thinking redline will be around 8500rpm so I would like the power to not die off until at least 8000rpm.


Power goal is 300+ rwhp w/ a 3" exhaust and hi-flo cat.

-Ben Martin

 

what kind of ports do you have that let you keep making power to 8500?

 

wishful thinking

I want power to die off around then. I know peak won't be up there.

But I know that I will have no idea what my car will do until I get it together

http://www.pbase.com/meanrex/image/62492149 this is my port next to a stock FD port

http://www.pbase.com/meanrex/image/62492142 heres a good side angle

 

Dude, your outer rotor housing o ring wont last long from the looks of the pic you posted.

http://www.pbase.com/meanrex/image/62492142

The casting has rusted away and theres very little left material here to keep your o ring from busting through. It may be just the picture, but it looks bad.

~Mike............

 

yeah YOU actually want peak power under 7000ish, cause thats what will keep you from shifting @12.5....

 

I'm not positive, but I think it's the exhaust port that you should be concerned with. Actually, both, but more the exhaust, which is what is going to choke up at that high rpm. Has your exhaust port been enlarged?

This is my Racing Beat exhaust race port for comparison (13brew)

 

thanks for pointing that out, ill run it by my engine builder.