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It was a combination of 18lbs. 8 from the stock blower and the other 10 were from the turbo's.
Did you read 18lbs from a source under the blower to get a "true" total psi measurement?
I ask because 8lbs from the blower and 10psi from the turbos does not equeal 18lbs total. You you dont add the boost together, you have to determine the pressure ratio for each on there own and multiply the pressure ratios to find the compound pressure ratio, reverse the math to find total boost.
For example:
For the above referrenced numbers the math is this:
Where as * is multiply, and / is divide and 14.7 is atmospheric pressure which has a pressure ratio of 1
(8psi + 14.7) / 14.7 = 1.54 pressure ratio for the blower
(10psi + 14.7) / 14.7 = 1.68 pressure ratio for the turbos
1.54 * 1.68 = 2.59 total pressure ratio
(2.59 * 14.7) - 14.7 = 23.37 total psi
18 total psi would be 8psi from the blower and 6.53psi from the turbos as measured at their outlet before the SC.
Ken
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