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Old 11-27-2010, 01:49 PM   #1
joecoolly14
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Join Date: Oct 2010
Location: Naples. FL
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2011 Wrx
DGM

Default Actual '11 WRX HP?

Has anyone dynoed theirs? I keep hearing "Oh they rated the HP to the wheels this year. So it really has 3xxhp" The dyno results I have seen have baselines ranging from 219awhp to 240+awhp. Idk maybe its just me but thats a pretty big difference for stock. Those dynos were from the cobb site:


http://accessecu.com/dyno/

Im unaware of any dynos in my general area otherwise id be here posting results lol
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Old 11-27-2010, 02:49 PM   #2
Unabomber
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No one on the planet earth can equate chassis dyno to engine dyno. What it says on subaru.com is the HP rating. What is says on XXXXX dyno is what it says. NEVER the twain shall meet.
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Old 11-27-2010, 02:59 PM   #3
mudferret
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Don't worry about the absolute number, look at your baseline number and then compare the after numbers. Dyno #'s are all but useless unless you have a before/after xyz mod. They tell you how much you've gained, or lost. Someone posts results from a lower reading dyno at elevation and everyone tells them their car is broken...
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Old 11-27-2010, 05:29 PM   #4
mesarec
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Dyno racing is fun...until you realize you're arguing about numbers that don't mean to much.

Results and driver are what matters. This has all been covered on another thread
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Old 11-27-2010, 06:25 PM   #5
joecoolly14
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I was just interested, I guess ill just wait to dyno after I get some goodies
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Old 11-27-2010, 09:02 PM   #6
xluben
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Quote:
Originally Posted by Unabomber View Post
No one on the planet earth can equate chassis dyno to engine dyno. What it says on subaru.com is the HP rating. What is says on XXXXX dyno is what it says. NEVER the twain shall meet.
I agree that a dyno is a tool for seeing the result of a change, not as an end all number machine, but manufacturer ratings aren't worth much more IMO. I don't think there's anything stopping manufacturers from under-rating cars as much as they want. Just for reference here are the results from COBB's baseline dyno runs (as posted on their site):

STI, 2008, 233/253, Barnes, Andrew
STI, 2008, 239/258, COBB Tuning
STI, 2008, 247/245, Hoffman, Aran
STI, 2008, 245/242, Motorsports, Performance
STI, 2008, 236/238, Pickett, Rob
STI, 2009, 243/245, Diens, Tim
STI, 2010, 228/239, COBB Tuning
STI, 2010, 226/240, Pentimonti, Tony
STI, 2011, 236/227, Mitchell, Mario
STI, 2011, 250/254, Pease, Dave
STI, 2011, 251/255, COBB Tuning
STI, 2008+, 239/245, AVERAGE

WRX, 2009, 231/239, Brackenbrough, Mike
WRX, 2009, 241/239, Braun, Jeremy
WRX, 2009, 233/248, Keenan, MJ
WRX, 2010, 244/258, COBB Tuning
WRX, 2010, 244/258, Branen, Charles
WRX, 2010, 246/259, Gill, Evan
WRX, 2011, 223/255, COBB Tuning
WRX, 2011, 251/255, Miller, Josh
WRX, 2011, 218/251, Vonali, Ritter
WRX, 2009+, 237/251, AVERAGE

You can see that even though the STI has a much higher HP and TQ rating than the WRX, they dyno in the same range. Of course there is considerable variation from car to car, but in the end the averages are pretty close. Seems to be a reasonable amount of data to back the assumption that 09+ WRX's are under-rated. Maybe this is just me rationalizing my WRX purchase

Quote:
Originally Posted by joecoolly14 View Post
I was just interested, I guess ill just wait to dyno after I get some goodies
This is basically what everyone was telling you not to do. If you don't dyno until after you have your modifications done, then you have nothing to compare it to. The best thing you could do is go to a local dyno and get a baseline pull now. Then you'll have a chart to compare to once you do your mods. If there's more than one shop in town, and you don't know which one you'll use, get a baseline at all of them!
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Old 11-27-2010, 09:11 PM   #7
Spieldawg
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The best way to really see the results of any modification, is get your baseline dyno pull.. then when you add parts, hit the dyno again...

But the baseline is the most important.. bone stock.. then let the mod bug bite!
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Old 11-28-2010, 10:52 PM   #8
Badmunky
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Thous dyno # posted for the STI and WRX leave out one important factor.
The gear the pull was done in.
The WRX was most likely done in 3rd while the STI was done in 4th.

I have a seen a Cobalt SS S/C that has gearing vary close to the WRX do a pull in 3rd then do one in 4th not 15 min later and show a 35hp loss. Then do another 3rd gear pull and show almost the exact same #s it did on the first pull.

Later.
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Old 11-29-2010, 12:40 AM   #9
Ride1226
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They also have completely different gearing ratios... The STi is always done in 4th because that is one of the longer gears, the wrx in 3rd for the same reason. Should we all just start doing 1st gear dyno pulls so everyone is closest to equal?
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Old 11-29-2010, 07:55 AM   #10
xluben
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So a 3rd gear pull on a dyno set up for a 3rd gear will give a different result than a 4th gear pull on a dyno set up for 4th gear?
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Old 11-29-2010, 10:13 AM   #11
Ride1226
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No. Dynos are set up and calibrated for what your gonna use them for.
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Old 11-29-2010, 12:54 PM   #12
SWP n Gold
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Dynos are just tools for tuning. Dyno before and after mods to see any increases in whp. Go to the track to see how fast it is.
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