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Old 03-25-2009, 12:12 AM   #1
cococly
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Lightbulb Random:Do you trust this dyno result?

I found a sweet website that has quite a few wheel horsepower rating for cars.

http://www.rri.se/index.php?DN=29&List=A-B


08 STI got 266bhp at the wheels
http://www.rri.se/popup/performanceg...p?ChartsID=838
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Old 03-25-2009, 12:13 AM   #2
Yannerd
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It's all relative, your dyno numbers will be different one different dynos. Comparing two cars on the same dyno is probably better comparison.
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Old 03-25-2009, 03:22 AM   #3
aspect
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Like yan said, it's not about "trusting", it's about knowing that every single dyno on the planet could have a different output for the same car based on the brand of the dyno, the conditions where the shop is, how the dyno is set up/programmed and how it is being operated.

So yes, I trust that their dyno screen said 266 after they ran that car, but that doesn't really mean anything.

Read the dyno scores sticky. Pat lays it all out.
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Old 03-25-2009, 10:13 AM   #4
Splinter
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brake horsepower and wheel horsepower are different numbers, for the record.

Brake horsepower is measured at the flywheel, with all accessories running (alternator, power steering etc)
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Old 03-25-2009, 11:20 AM   #5
notjustforshow
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What everyone has said...but really I like seeing the wildly high reading dynos, gives me a good laugh when someone adds an intake and gains 50whp.
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Old 03-25-2009, 12:11 PM   #6
Yannerd
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Quote:
Originally Posted by notjustforshow View Post
What everyone has said...but really I like seeing the wildly high reading dynos, gives me a good laugh when someone adds an intake and gains 50whp.
They probably don't because they never did a baseline dyno on the stock car.
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Old 03-25-2009, 12:20 PM   #7
notjustforshow
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Quote:
Originally Posted by Yannerd View Post
They probably don't because they never did a baseline dyno on the stock car.
Exactly.
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Old 03-25-2009, 12:32 PM   #8
Yannerd
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I guess you're not really understanding my point. What I'm saying is you can't take, say a stock WRX does 160whp on one dyno then you compare it to another WRX on another dyno with an intake that makes say 190whp. That doesn't mean the other dyno is reading 30hp too high because that same WRX stock might be putting out say 185whp. When you say "someone adds an intake and gains 50whp" you're not gaining 50whp you're just comparing apples and oranges. That "horsepower" number is all relative like aspect said based on a variety of factors. What you should be looking at is your gain in hp based on your mods on the same dyno.
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Old 03-25-2009, 02:19 PM   #9
notjustforshow
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^oh no I see your point, and that was what I was trying to say in the first place.
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Old 03-25-2009, 04:56 PM   #10
alcoolaid
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All dyno's read different. It's like comparing Pats DD dyno numbers to another shops DD dyno numbers. Other shops like to use a correction factor of like 1.2 to get it up to other higher reading dyno numbers.
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