hey guys i have a garrett t04z to go in for my single conversion... i have been searching for a compressor map for the turbo. this is the closest i can find. do all the t04z's work of this map or do i need a different map for a different AR? to read the map the pressure up the left of the map is that bar of boost to flow the cfm?

thanks mark

 

the compressor map is not affected by the turbine housing A/R . The turbine map does change with different A/R's though. I have not seen turbine maps for the T04Z, although Garrett publishes them for GT series turbos.

 

"to read the map the pressure up the left of the map is that bar of boost to flow the cfm?"

the left side is in pressure ratios. one "pressure" is 14.7 psi. since it is absolute the numbers include one "pressure" at sea level.

in order to solve for what you see on your boost gauge you need to subtract one pressure.

now that i have confused you let's do an example.

note the "3" on the scale...

that is 3 X 14.7 or 44.1 psi. we need to subtract the base sea level 14.7 so the boost on your gauge would read 29.4 psi or 2.02 bar (a bar being 14.5 psi).

and yes, use the above map for your TO4z.

hc

 

Thanks howard, I have worked on pumps using flow charts for years so i am familia with pressure, but i didnt know that the scale up the left was absolute! thanks you, so if i was aiming for 25psi on my gauge i would read the graph at approx 2.6 absolute pressure to give me the cfm that the turbo would flow at that pressure correct?

how then do i calculate the rwhp that the turbo will be making at that flow? the turbo is brand new and im just trying to make sure it is going to do the job before i put it in!

Thanks Mark

 

i think 2.6 is slightly to low its more like 2.8 maybe.. and if i read the chart correctly it will be flowing 60cfm at around 69 to 70% efficency. which seems pretty good to me, but is that gonna make 550 600 rwhp with all the supporting mods?

Thanks Mark