Updated/Customizable Airflow Tables - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-07-2014, 11:52 PM   #1
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Default Updated/Customizable Airflow Tables

I have this airflow chart saved.. I believe it was originally from a fellow here on MT.N built an airflow calculator for the Miata. I have modified it so that you can change all the values to your liking.

This airflow chart will allow you to plug in whatever volumetric efficiency you'd like, your engine displacement, and then it has a 9x6 customizable table for RPM vs boost. Plug in whatever boost values you want, and whatever RPM values you want, and it will give you all your airflows in both CFM and in lbs/min.

Download link is here: http://m-lev.com/Turbo%20Airflow%20Calculator.xls and I also attached it to the post.

Not sure if this will be SUPER helpful as compared to the other, but if anyone is wanting to turbo a different car/port their engine/whatever, it will be nice.

Change the values highlighted blue.

EDIT: here's a preview of what it looks like now. You change the blue values, and the entire table (and the table below) will change with it.

Attached Files
File Type: xls Turbo Airflow Calculator.xls (33.0 KB, 29 views)
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Old 07-08-2014, 09:59 AM   #2
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Now you need to set it up to plot those points on compressor maps.
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Old 07-08-2014, 10:55 AM   #3
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Actually, that's kinda my end-goal. The only problem is, no turbo manufacturers out there seem to have compressor maps higher resolution than like 300x500, which is stupid as hell, and then I'd need to overlay them all on the same scale, and write a program to plot some points based on that scale.

Anyone know where I can get some higher resolution compressor maps?
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Old 07-08-2014, 11:03 AM   #4
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I was just going to upload the one I have that already has most of this done. But the ---- ****** of a website doesnt want to take my 2.5mb .xls file for some dumb reason.
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Old 07-20-2014, 06:51 PM   #5
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WHy are the pressure ratios different between the lbs/min and the cfm?

Also you have the same pressure ratio for 6 and 10 PSI in the lbs/min table?
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Old 07-20-2014, 06:55 PM   #6
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Very good catch, and points to you.

I forgot to update some of the labels in the lower table. The numbers themselves for flow should be correct though.
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