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Well, for starters, you have different units on those two maps, which makes things a bit more difficult, but, i'll give you a general overview.

The vertical axis is pressure ratio, meaning how much the air is compressed. Here a ratio of 2:1 means it's compressing the air to twice the normal density, giving you 1bar of MAPressure.

The horizontal axis is actual flow. The TD04 map is in cubic feet/minute (CFM) while the T3 is in LB/MIN. This makes comparison a bit tough between the two maps.

The lines that are curving across the middle of the map are turbine RPMs.

The lines enclosing area on the maps are efficiency rates. If you look on the TD04 map, you can see the percentages written on the map.

Now, reading the TD04 map, we see that peak efficiency is 76%. The area enclosed by the 76% line includes all of the area in which the turbo is operating at peak efficiency. That said, the most you can get out of the TD04 at peak efficiency is about 0.9bar of pressure and 225 CFM of flow.

The T3 map is rather crappy. While we can still tell where peak efficiency is, we aren't quite sure exactly how efficient the turbo is inside that area. You can, however, see that you can run about 1.25bar of pressure within peak efficiency and flow around 25 lb/min of air.

A direct comparison of the two turbos can't be accurately made with these two maps because a cubic foot of air will weigh different amounts depending temperature.

That said, you can push the turbos out of peak efficiency range. You'll heat up the air quite a bit as you move farther out on the maps though.

One last thing youc an tell from the maps is what the turbo is capable of at certain rpms. If you follow the rpm lines across the map, they show the exact CFM for a certain pressure at a certain rpm. For example, on the TD04 map, there is a point included that shows that with the turbo spinning at 150,000rpm, the turbo will push out 360CFM at 1.0bar of pressure. This also puts it in the 60-65% efficiency range. (bad)

Hope this helps!


Now...what we need is a compressor map library!
 

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Turbo info thread (flow, compressor maps, etc...)

Compiled by Hotrod on NASIOC:

Last updated 12/28/02
Turbo Type ----------- Approx flow @ pressure
Stock Turbo ---------- 360 CFM at 14.7 PSI
IHI VF 25 ------------- 370 CFM at 14.7 PSI <--- estimated
IHI VF 26 ------------- 390 CFM at 14.7 PSI <--- estimated
T3 60 trim ----------- 400 CFM at 14.7 PSI
IHI VF 27 ------------- 400 CFM at 14.7 PSI <--- estimated
IHI VF 24/28/29 ----- 410 CFM at 14.7 PSI <--- estimated

========= 422 CFM max flow for a 2 Liter at .85 VE pressure ratio 2.0 (14.7 PSI) 7000 RPM =======

IHI VF 23 ------------- 423 CFM at 14.7 PSI
FP STOCK HYBRID -- 430 CFM at 14.7 PSI <--- derived from HP potential listed on web
IHI VF-30 ------------- 435 CFM at 14.7 PSI <--- estimated
SR 30 ----------------- 435 CFM at 14.7 PSI
IHI VF-22 ------------ 440 CFM at 14.7 PSI <--- refigured
T04E 40 trim -------- 460 CFM at 14.7 PSI

========= 464 CFM max flow for a 2.2 Liter at .85 VE pressure ratio 2.0 (14.7 PSI) 7000 rpm =======

PE1818 -------------- 490 CFM at 14.7 PSI <--- estimated from max flow numbers
Small 16G ------------ 505 CFM at 14.7 PSI
ION Spec (stg 0) --- 525 CFM at 14.7 PSI <--- per vendor post 12-27-2002

========= 526 CFM max flow for a 2.5 Liter at .85 VE pressure ratio 2.0 (14.7 PSI) 7000 RPM =======

Large 16G ----------- 550 CFM at 14.7 PSI
SR 40 ----------------- 595 CFM at 14.7 PSI
18G ------------------- 600 CFM at 14.7 PSI
PE 1820 -------------- 630 CFM at 14.7 PSI <--- estimated from max flow numbers
20G ------------------ 650 CFM at 14.7 PSI
SR 50 ---------------- 710 CFM at 14.7 PSI
GT-30 ---------------- 725 CFM at 14.7 PSI
60-1 ----------------- 725 CFM at 14.7 PSI
GT-35R -------------- 820 CFM at 14.7 PSI
T72 ------------------ 920 CFM at 14.7 PSI <--- Note you would have to spin a 2.0 L engine at about 14,000 rpm to flow this much air.

IHI VF 25 ----------- 395 CFM at 18 PSI <--- estimated
IHI VF 26 ----------- 400 CFM at 18 PSI <--- estimated
T3 60 trim ---------- 410 CFM at 20 PSI
IHI VF 27 ----------- 420 CFM at 18 PSI <--- estimated
IHI VF 24/28/29 -- 425 CFM at 18 PSI <--- estimated
IHI VF 23 ----------- 430 CFM at 18 PSI <--- estimated
IHI VF-30 ----------- 460 CFM at 18.0 PSI <--- estimate based on trap speeds of cars running this turbo
AVO 320HP -------- 465 CFM at 17.5 PSI
T04E 40 trim ------ 465 CFM at 22 PSI
FP STOCK HYBRID- 490 CFM at 18.0 PSI
IHI VF-22 ---------- 490 CFM at 18.0 PSI <--- refigured
SR 30 --------------- 490 CFM at 22 PSI
Small 16G ---------- 490 CFM at 22 PSI
ION Spec (stg 0) - 500 CFM at 19 PSI <--- per vendor post 12-27-2002
PE1818 ------------ 515 CFM at 22 PSI <--- estimated from manufactures rated max power
Large 16G --------- 520 CFM at 22 PSI <--- upgraded flow some on review of compressor map

========= 526 CFM max flow for a 2 Liter at .85 VE pressure ratio 2.5 (22 PSI) 7000 rpm =======

========= 578 CFM max flow for a 2.2 Liter at .85 VE pressure ratio 2.5 (22 PSI) 7000 rpm =======

HKS GT2835 ------- 580 CFM at 22 PSI 400 hp
MRT 400 ------------ 580 CFM at 16 PSI
AVO 400HP -------- 580 CFM at 17.5 PSI
MRT 450 ------------ 650 CFM at 19 PSI
AVO 450HP -------- 650 CFM at 20.0 PSI
SR 40 ---------------- 650 CFM at 22 PSI

========= 658 CFM max flow for a 2.5 Liter at .85 VE pressure ratio 2.5 (22 PSI) 7000 rpm =======

HKS GT3037 ------ 670 CFM at 22 PSI 460 hp
PE 1820 ----------- 680 CFM at 22 PSI <--- estimated from manufactures rated max power
20G ---------------- 695 CFM at 20.0 PSI
HKS GT3040 ----- 710 CFM at 22 PSI 490 hp
AVO 500HP ------ 770 CFM at 22 PSI
SR 50 ------------- 770 CFM at 22 PSI
GT-30 ------------- 790 CFM at 22 PSI
60-1 --------------- 800 CFM at 22 PSI
HKS GT3240 ----- 830 CFM at 22 PSI 570 hp
GT-35R ----------- 880 CFM at 22 PSI
T72 --------------- 1000 CFM at 22 PSI <--- note you would have to run a 2.0 L engine at >40 PSI boost to flow this much air

Conversions used where I had control over conversion factors:
1 HP approx equals 1.45 CFM

1 CFM approx equals 0.0745 lb of air/min

0.108 Lb/min approx equals 1 hp

1 Meter cubed/sec = 35.314 CFS = 2118.867 CFM

1 KG/sec = 132 lbs/min approx equals 1771.812 CFM

power coversions:
1 PS = 0.9859 HP = 75 Kgf m/sec
1.3405 HP = 1 KW
1 HP = 746 watts
 

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See? When Rez doesn't sleep, good things happen! :D :cool:

Breaking out in cold sweats...is that a sign of sleep deprivation or caffeine overload? :eek: :confused:
 
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