Understanding a turbo map

[MarioVelotta]

Hey chaps,

stumbled on this great thread surfing last night and would like to share! Great info to get you going.

http://www.vauxhallsportforum.com/phpBB ... s-t92.html

[Hotrodvw]

Thanks Mario!

[seabeebuggy]

Thanks Mario

[my_medusa]

really interesting would be how to read the turbine maps that are for the garrett gt series. is there any info to find the right turbin side?

wishes

[MarioVelotta]

It's the same principle as a compressor map each has a flow rating.

GT2860RS_739548_1_turbo_e.jpg

If you look at this with an .86 ar your turbine isn't going to be choked off at 21 or so lb/min of exhaust flow. Or the .64 at 17 lb/min.

I'm not sure just exactly how to figure the exhaust flow yet. I do know my pressures though so I'm close I think.

[my_medusa]

but thats my question how to use this numbers of flow?

wishes
christian

[MarioVelotta]

If someone wants to give an excel spreadsheet a go you can plug these equations in

http://www.dragracemath.jimhatleyracing ... eflow.html

[miniman82]

I'm not sure just exactly how to figure the exhaust flow yet.

Garrett has turbine flow maps as well, you just don't see them published because people are way too preoccupied with compressor flow. Give them a call, I'm sure you can convince them you need map x y and z since you 'are a faithful buyer of their products, and recommend them highly to all your customers', hint hint.

[panel]

How do you plot a graph like this? I've done a little plotting for mine but how do you get the line from the first point to the second point.This is not my turbo it's just for reference. Mine points seem to not be smooth(if I can remember) or I'm just guessing at the PSI through-out the RPM.

[MarioVelotta]

I come up with something like this

[Stripped66]

Here's a fun calculator to play with:

http://www.squirrelpf.com/turbocalc/

[MarioVelotta]

If you hop on the forum and ask real
nice he will add maps for you He's added a couple
for me.

[miniman82]

Which begs the question: what will YOU do if I ask real nice?


Answer truthfully, we're Facebook friends.

[my_medusa]

i found sometihing about turbin calculations...but over edges.
at first the link to the really really wide open calculator.
thanks borgwarner!!!
but it is more really usefull for the big turbo guys!
http://www.turbodriven.com/performancet ... index.html

to the turbin calculations:
at the end it calculate you a curve like squirrel but also the curve for the turbin...
so everybody could let calculate his exhaust curve. the only thing is i do not see in what the y-axle is..it is not kg/sec.
i belive it should be lb per second????right? i give it a try and checked some compareable exhaust housing from the garrett gt series and i it workes with lb/sec to lb/min.

for finding the right turbin housing and the right A/R it could be usefull.

the whole calculater can be used like squirrel but more interesting data and more possible input. i checked it with my dream engine and it put out the same hp, pressure ratio+++ range and curve for a compressor map like squirrel and now also turbin curve.
i really like it!

[Humpty]

I come up with something like this

That GT2560R map is handy.... That's the exact same turbo I have on the POS currently.... With the little mouse motor attempting to make it spool.... I reckon the 2276 should wake it up a little.... Nice to know I don't have to rebuild the whole box'n'dice for the new longblock!