turbo compressiors map headache - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 5 Old 04-27-2007, 09:00 AM Thread Starter
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turbo compressiors map headache

I bought a turbo book, down load and printed 100;s of maps, read 100;s of pages turbo stuff, and im still lost on this compressor map..please explain it to me in terms that a retard could understand..i got the 2.02= 14.7 psi,


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post #2 of 5 Old 04-27-2007, 12:32 PM
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I would also like to know how read a compressor map.


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post #3 of 5 Old 04-27-2007, 01:08 PM
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This is the way I look at it. It is a simplification. In the maps you have pressure ratio (boost+atm)/atm plotted versus airflow.
To evaluate a turbo for your use, you need to know how much airflow you need and how much boost you are planning on running. You calculate how much airflow your particular motor needs at a certain rpm of interest at a certain boost level. Lets say you want to run 10 psi of boost on a 5.0 motor spun at 6000 rpm. That is about 735 cfm or 48#/min. Look at some of the compressor maps now. On the Y axis look for 1.68 pressure ratio [(10+14.7)/14.7] on the X axis look for your 735 cfm. Does the intersection of those points fall within the efficiency range of the compressor? Those are those islands on the map. You must have a T3 turbo in your collection. Try and plot that on there. You will see that a single T3 cannot supply that kind of air. Now if you run 2 T3s your engine size is effectively 2.5L per turbo. Now check the same pressure ratio at 368 cfm. That should be right in a sweet spot of the map. Now lets say you want a single turbo. Look at a T60 or T70 map with your 5 L numbers. It is good to check how the turbo matches up at several points in your rev range. If a turbo is too big, you may be out of the efficiencey range at lower rpms. It all depends where you want your usable power to be. Smaller turbos will hit hard and early but finish fast and not be able to feed enough air at high rpms.
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post #4 of 5 Old 04-27-2007, 10:09 PM Thread Starter
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excatly where do the need to fall at..in the center or edge

1962 falcon stock 1992 302 short block, RHS heads, 1.5 inch headers ..bullet cam ..victor jr.. [email protected] on 26x8.5 inch slicks with 1962 suspension(under construction getting back halved)

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post #5 of 5 Old 04-29-2007, 10:24 PM
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The center is best but being on the map is fine. Just think about what part of your driving you are doing at the edge. For example, if you are running a sort of large turbo that is starting out at the edge but then getting into the sweet part of the map, that is fine. But if all you ever hit is the edge, you may want a different unit.
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