MSP volumetric efficiency

[TurfBurn]

His CFM is ok.. but yes his PR is a little high for the turbo... but that's pretty normal for most turbos... he's not way outside of the efficiency peak, so he's pretty good overall... can't go a lot higher though.

 

[Spooled]

don't need inertial charging when running FI.... so you can get a slightly cleaner mixture... less chance of reversion from the exhaust gases. but it'd all be a matter of testing etc.

That and you're not pushing charge out the exhaust ports.

 

[Spooled]

That Excel spreadsheet is great!

 

[Spooled]

I mapped out the GT25R (roughly). 1 bar at redline would be ideal for this turbo, assuming a fairly stock VE. You can really see where a higher flowing compressor would make a difference for people with free flowing systems.

 

[TurfBurn]

I'm too lazy to map mine.. but here is a Big 16G which is a little less flowing than mine... my turbo reaches out past 550 CFM for comparison... but same rough map..

 

[Kooldino]

Kooldino, am I wrong in saying that it looks like your T3 is a little small for the amount of boost you are running?

You're right, assuming my numbers are correct. That's what I'm unsure about.

I pulled pressure drop and VE out of my ass.

Also, I just kind of guestimated at my spool up, which varies greatly based on what gear I'm in. What I used in the excel file was closer to my 2nd gear spool, but not as fast as the 3,4,5th gear spool.

Another thing I'm REALLY not sure about is my conversion from CFM to lbs/min of air. I just used the first number I found on google. Apparently, though, there's a slew of numbers you can use, since it's not an apples to apples conversion.

So I'm not going to take my calculations as gospel until I clear some things up.

 

[peepsalot]

I mapped out the GT25R (roughly). 1 bar at redline would be ideal for this turbo, assuming a fairly stock VE. You can really see where a higher flowing compressor would make a difference for people with free flowing systems.

Where do you get 1bar from? the points you plotted look like 10.3 psi if I'm reading that right.

 

[Spooled]

Where do you get 1bar from? the points you plotted look like 10.3 psi if I'm reading that right.

You're right. I wasn't referring to my plot, though. I was saying that 1 bar (2.0 PR) seems to be a good place to be withthe stock compressor wheel. I'm only at 7 psi right now.