Some more fun with Garrett Boost Advisor - I tried to simulate RTErnie's dyno run, 557 whp on E85 posted in post #1986.
In this run 34psi (max boost) was reached at 4000 rpm. That's going to be the first operating point (mid).
Max hp was reached by about 7000 rpm, you could even say 6500 rpm. I'll use 7000 for the second operating point (max).
HP target is 735 at the crank. This is figuring 25% drivetrain losses, I don't know, maybe that's a little high. Anyway that's about 550 hp at the wheels.
2.2 liters.
VE=98% This I tweaked to get the required boost to come out to 34psi which is what ernie's graph shows it was at 4000 rpm. Default given for 4 valves per cyl is 90%.
Intercooler eff = 80% This is a little higher than the default given for air-to-air.
Western WA zip code - cool weather and high baro pressure.

Let's look at the operating point summary table:

[IMG][/IMG]

Looks good, HP and boost agree well with what is in RTErnies dyno data at both points.

So let's see what turbos the advisor picks out for ernie:

[IMG][/IMG]


Aw bummer there aren't any GTX's on the list!

Let's look at the map for one of these turbos, with the 2 points plotted:

[IMG][/IMG]

Man look at that first point way out in left field. RT, it might just be that you can't do what you did with any Garrett turbo

 

Bah, excel and a hour worth of time and you can build your own "matchbot." Hell, I've got one that will map the ECU for fuel, match the turbine, spit out a dynochart, calculate fueling requirements, and it works with most turbochargers (properly correcting for each brand's standard conditions I might add).

FWIW, I think Garrett used the extended tip stuff back in the 90s on the TR30R. Along with billet wheels back in the 80s. Just sayin...

 

for the 1.05 A/R divided T4 turbine housing on the EFR7670 - Does anybody know or have an estimate of what the Area (A) is?

 

PR would be ~2.32, not 3.32

34psi/14.6psi = 2.32

EDIT: I'm wrong.

 

34psi boost + ~14.6psi atmosphere = 48.6psi absolute manifold pressure / 14.6 = 3.32 PR

I'm actually surprised you didn't know that! Or am I missing something here?

 

eh ****. I'm wrong. yeah yeah... rub it in... we all make mistakes.

320kpa/100kpa = 3.2

 

Haha I wasn't really rubbing it in (too much ) - I've seen you tackle much more complicated topics so figured it must have been a moment Gist at the end of the day is the EFRs are pretty awesome turbos, I am most impressed with the more recent history of events regarding them.

 

Aw he was probably on pot. It's legal here now you know. Isn't it? Ernie? Jeez I don't know maybe we have to wait until January

 

It's fast that's all you need to know...

 

Pictures don't work. And my EFR is up for sale.

 

I have ordered EFR Turbo 7670 on 21st of August, and it is not ready yet, can anyone tell what is going on with BW?

 

nobody knows. it sounds like since the release, their suppliers are having a hard time making the parts in the quantities/quality they need. lots of people have been waiting a lot longer than you and they still dont have their turbos. a few of us ordered early and got ours a while ago.

 

technically... there is a waiting period before it's legal. And I certainly didn't vote to legalize it... just what we need... people driving stoned.

 

or posting stoned

 

more like posting past my bed time. I smell like milk and baby wipes.