Maximum Boost owners: Compressor map question
04-27-2002, 12:55 AM
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Maximum Boost owners: Compressor map question
I've been trying to figure out compressor maps and I think I figured out what turbo I need. If you have "Maximum Boost" you should know the cfm formulas. Here is what numbers I used: 94ci, and 7800 rpm and 85% for Ev. Came out to 252cfm at 7psi, 328cfm at 12psi and 425cfm at 20psi. Based on this I looked a the turbonetics maps and am thinking about the 50 trim. If I am reading the map right, about 74% efficiency at 12psi and 70% at 20. The map looked like the 50 trim flows good between 12 and 18 psi for my application. Does this look right to you guys?
04-27-2002, 01:26 AM
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Re: Maximum Boost owners: Compressor map question (sweettooth)
I'm curious, are you converting the CFM to Pounds per Minute (LB/MIN) and also the PSI to Pressure Ratio (PR) when you are looking at the compressor maps?
A while back someone gave me the conversion ratio to change CFM to LB/MIN and by doing a little extrapolation, I determined that @ 112 degrees (air temperature)the conversion factor is 0.070318
<U>252 CFM</u>
252 * 0.070318 = 17.75 LB/MIN
<u>328 CFM</U>
328 * 0.070318 = 23.06 LB/MIN
<U>425 CFM</u>
425 * 0.070318 = 29.89 LB/MIN
and to change PSI to PR it's in the book:
PR = (PSI + 14.7) / 14.7
<U>7 PSI</u>
(7 + 14.7) / 14.7 = 1.48 PR
<U>12 PSI</u>
(12 + 14.7) / 14.7 = 1.82 PR
<U>20 PSI</u>
(20 + 14.7) / 14.7 = 2.36 PR
[Modified by BlueShadow, 10:26 AM 4/27/2002]
A while back someone gave me the conversion ratio to change CFM to LB/MIN and by doing a little extrapolation, I determined that @ 112 degrees (air temperature)the conversion factor is 0.070318
<U>252 CFM</u>
252 * 0.070318 = 17.75 LB/MIN
<u>328 CFM</U>
328 * 0.070318 = 23.06 LB/MIN
<U>425 CFM</u>
425 * 0.070318 = 29.89 LB/MIN
and to change PSI to PR it's in the book:
PR = (PSI + 14.7) / 14.7
<U>7 PSI</u>
(7 + 14.7) / 14.7 = 1.48 PR
<U>12 PSI</u>
(12 + 14.7) / 14.7 = 1.82 PR
<U>20 PSI</u>
(20 + 14.7) / 14.7 = 2.36 PR
[Modified by BlueShadow, 10:26 AM 4/27/2002]
04-27-2002, 06:21 AM
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Re: Maximum Boost owners: Compressor map question (apexii)
it was just a regular T04E 60 trim compressor map from http://www.turbocharged.com BUT I added all the text and curves with a paint/jpeg/image editor. I just hope my free image hoster doesn't run out of bandwidth.
I would only use this method of selecting compressors for low-mid boost 15 PSI and less. Above 18 PSI thiings start to get complicated and it gets a little more in-depth.
[Modified by BlueShadow, 3:22 PM 4/27/2002]
I would only use this method of selecting compressors for low-mid boost 15 PSI and less. Above 18 PSI thiings start to get complicated and it gets a little more in-depth.
[Modified by BlueShadow, 3:22 PM 4/27/2002]
04-27-2002, 08:33 AM
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Re: Maximum Boost owners: Compressor map question (BlueShadow)
Nice, I have the 60 trim myself. I saved the image so i'll host it if it goes down.
I'm interested in higher boost levels, for 6-8lbs@8.8:1 it's not too efficient, but will be in the higher boost ranges. I took this turbo up to 13-14lbs once on my stock block, and it felt amazing.
I'm interested in higher boost levels, for 6-8lbs@8.8:1 it's not too efficient, but will be in the higher boost ranges. I took this turbo up to 13-14lbs once on my stock block, and it felt amazing.
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