the compressor map for the 50 trim t3 looks like poop over 230 hp or so... but as mentioned in my dyno thread i'm pretty sure my turbine is too small.

pat: for your power goals I'd recommend a .63 turbine with a 50 trim to4e, that's what I'm planning to upgrade to in the future and it should support around 350 whp, more than that and you'll want to port the turbine (stage II/III) and maybe go up to a 57/60 trim t4 compressor.

you make no mention of building your bottom end for you end goal. are you planning on running turbo + nitrous @ over 300 whp without a bottom end build?

 

Yea, planing to run a stock bottom end for 1 year. That's the turbo I'm considering running. You mention that over 350whp, a compressor upsize would be favorable. If I were to buy the larger compressor now, what would be the downside? Would it just hurt spool? Reason I ask is I'd like to buy it once and be done. If we're talking say 200 RPM difference in spool I could live with that. I'll have nitrous to get it going anyway when it matters.

 

Bud, you've been here long enough that I hope you know that a stock bottom end isn't going to like 300whp and nitrous on top of that for long...

 

Where's Paul? He's doing it. I'm not gonna spray all for adding hp, just to spool a big turbo at 3K instead of 5K. I know that's gonna be tough on it for sure, and truth be told I'd love to just push it to see what it will take. Say, get it to 300whp, then once my progressive WI and every other supporting thing is dialed in, just crank up the boost and see what it will take. With a conservative redline I bet I could sit around 350whp for year.

 

Paul is at 270. You have fun with stock rods and 350whp.

 

Paul hit 300 at the dyno day thingy. Bell seems to think RPM's are what kill stock rods, not HP. We'll see...

 

We certainly will. Hats off if you make it a year at 350whp on stock rods.

 

fwiw I run a home-brew saab/international T3/T4. It's a T3 .48 (unknown trim) turbine with a T4 .60 60t compressor and it moves too much air. =) I'm shooting for 450hp+ and I'm pretty sure my compressor will do it. The turbine on the other hand is too small at .48 but it spools the T4 pretty quick. Thing sounds like a jet. I should put up some av clips. I'm looking for opinions on turbines as well. I'm waiting to hear from mjm with their opinion.

 

a .48 T3 turbine housing is plenty big (17 lb/min)....equivalent of a .63 A/R T25 housing, and we all know those get the job done just fine. The .63 T3 housing will be larger (21 lb/min) than you need on most setups, but Pat can make due however. There are a lot of us with T3s and T3/T4 with the .48 housing and no torque/boost loss at redline making over 250rwhp. Remember 97.7 x 7000 / 3456 = 197 CFM or 13.5 lb/min, no reason to get a housing design for 21 lb/min when you can't produce near that amount of airflow.