Dyno Correction Factors (Imprezer?)
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Joined: Jul 2003
Posts: 20
From: Glendale, CA
Car Info: '03 WRX WGN, Stg 1, No Roof Rack!
Dyno Correction Factors (Imprezer?)
Imprezer ... I hear you ("AWD Dynos other than Vishnu in the Bay Area" Bay Area forum) ... buy still numbers are a hard reference ... best to always use the same dyno ... but it's nice to have a print out showing progress in what most of us would consider the right direction ... :-)
Is it valid to derive a correction factor by taking the average of stock WRX out puts on a particular dyno ... divided that into 227, our creator mothers advertised figure, and then use that result to come up with at least a good approximation of crank HP?
Stock WRX's measure between 155 and 160 whp on Shiv's Dyno Dynamics dyno. The average is 157.5 ... divide into 227, result 1.44. If my out put of Shiv's dyno is 206 whp ... then 1.44 times 206 is 296.6 crank HP? Is this basically correct?
Is it valid to derive a correction factor by taking the average of stock WRX out puts on a particular dyno ... divided that into 227, our creator mothers advertised figure, and then use that result to come up with at least a good approximation of crank HP?
Stock WRX's measure between 155 and 160 whp on Shiv's Dyno Dynamics dyno. The average is 157.5 ... divide into 227, result 1.44. If my out put of Shiv's dyno is 206 whp ... then 1.44 times 206 is 296.6 crank HP? Is this basically correct?
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There are two methods for obtaining a correction factor.
1) % method, as you are illustrating.
2) hard number method. (stock is ~160-165 WHP and 227 BHP, so always add ~60-65HP
The real world is probably somewhere in between those two. Some losses are losses that will increase with larger loads and faster acceleration. Some losses will not. The hard number is a conservative figure and the % method is an optimistic figure.
The bottom line is crank power matters little, so use whichever correction makes you happy.
1) % method, as you are illustrating.
2) hard number method. (stock is ~160-165 WHP and 227 BHP, so always add ~60-65HP
The real world is probably somewhere in between those two. Some losses are losses that will increase with larger loads and faster acceleration. Some losses will not. The hard number is a conservative figure and the % method is an optimistic figure.
The bottom line is crank power matters little, so use whichever correction makes you happy.
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