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Old 08-02-2011, 12:43 AM   #1
Scooby Newbie
Member#: 287149
Join Date: Jun 2011
Chapter/Region: MWSOC
2008 Wrx Sti

Default Quick question. How accurate is the Dyno meter on the accessport?

I did a dyno run on this feature and got a result of 334.96 whp at 5481 RPM and 336.58 tq. They seem a little high possibly. I was just curious if anyone knew how close it is to being accurate.
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Old 08-04-2011, 11:30 AM   #2
Scooby Specialist
Member#: 253560
Join Date: Jul 2010
Chapter/Region: South East
Location: Redneck Riviera, SC
'83 Subaru GL Wagon


Take it with a grain of salt but it is in the ball park. It all depends how close you were with your weight input.
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Old 08-04-2011, 07:52 PM   #3
Scooby Newbie
Member#: 185688
Join Date: Jul 2008
Chapter/Region: NESIC
Location: Maine
2006 STi
WR Blue


Technically if you are 100% exact on your weight input, on a perfectly level street, with no wind and are using the right tire size it should be exact. This is because HP=Work/Time and Work=Force*Distance and Force=Mass*Acceleration. The only parameters that the access port cannot figure out is the vehicle weight and wind resistance. It does add a significant amount for "drivetrain loss" if I remember correctly which may make it less accurate. For AWD cars most people go with a 20% power loss figure, don't ask me where they got it, but taking the 20% from your readings would put you around 268HP which is fairly spot on for what STi's dyno at on the wheels.
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