Compressor Upgrades for Greddy turbo - 18G vs 57trim vs H-3 vs GT3076 vs 60-1
 

This map is of some of the possible Greddy upgrade options all superimposed onto the same map . Took a lot of time as had to rescale all the maps and sketch by hand (as you can tell).

https://www.rx8club.com/attachment.p...1&d=1417134541

The large dots are actual flow readings from my own setup ,which has the stock 12blade turbine (clipped) plus mostly all the stock Greddy pipework . So it shouldn't be too far away from what others could achieve with the Greddy kit.

Nice!

in summary ................... for the 9to18psi range ,60-1 is king !

in summary...I need to up the boost

Yeap

Boost shown here is at the turbo BTW . With the 57trim at 15psi I saw less than 10 at the UIM.

This is some sexy info with an even sexier diagram ;)
I'll keep this in mind for April! Can't wait....

^ +1
Love it, very helpful... 60-1 with a nice increase in boost seems to match my goals nicely

If you get the BNR upgrade , make sure he fits the 11blade turbine as advertised on his website . The stock gredddy 12 blade is unsuitable and will adversly affect spoolup/flow. I know he doesn't always fit it though so insist he does .

I'm with Brett s on this one. My research on the turbine wheel pretty much ends with the same conclusion. The 11blade wheel will have better spool up. The downside(which we probably won't reach) is that when pushing for maximum power at the end of this turbo's effiency range the 12blade will reign supreme, although just marginally. In other words, the 11blade with a clip is the way to go :)

How does these compare with a GT35 wheel in original housing? Would be interesting to compare. I know it should be similar to the 60-1.
Thanks

the GT35 does better at higher boost but not as well lower down . Can plot it if you like ?

If its not to much of a hassle, then I think it would be a good comparison, but only if you have the time to plot it.
Thanks

Noted, thanks!

Yeah I have seen a few BNR's in person, they have all varied to some degree, mostly with the CHRA and the way the coolant fitting are situated. The pictures of the one I posted are the latest, as that turbo was done only a few months back.

My feeling is that the reverse is true but I'm not really sure on that.

I did research and spoke with multiple people on the subject. look into Subaru forums, fp performance (one of the companies BNR sources parts through), and AMS. SUBARU crowd loves the 60-1 with 11blade. some report 400+awhp on 20+ psi


Posted From RX8Club.com Android App

what did you find that supports the 12 blade being better for high end flow ?

TD06SL2 Question - Subaru Impreza WRX STI Forums: IWSTI.com

quick Google search revealed this. go go post #9.
I'm out and cant look through my personal comp. this is what I found using my phone

Posted From RX8Club.com Android App

Putting the 3582 in was difficult .... It pretty much matches the 60-1 all the way to 20psi. Was not sure how to treat the cutoff lines on the chart .

https://www.rx8club.com/attachment.p...1&d=1417552880

Dunno .........there are more variables that come into play than what they are talking about there .

Thanks for plotting that Brett, interesting to see how close the 60-1 and GT35 are through the 6-20 psi range. Looks like the 60-1 is slightly better down low and the GT35 is better after 20psi, which is way past where I would blow the engine to bits.

We are just looking primarily at what can be fittted to the Greddy that so many of us already have .... not so much trying to find the perfect turbo . But thanks for your input .

bret,

the backpressure is coming from the exhaust manifold?

beers :beer:

you talking about the loss of power running 15psi on the 57trim ?

Backpressure from trying to drive a small turbine (in a small turbine housing) past it's choke point is what I was refering to .