Horsepower questions / low HP gains
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This is a discussion on Horsepower questions / low HP gains within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a 2006 WRX stage II with an Invidia catless downpipe and a Perrin cat-back exhaust. I know the ...

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    Registered User Dirty Bucket's Avatar
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    Horsepower questions / low HP gains

    I have a 2006 WRX stage II with an Invidia catless downpipe and a Perrin cat-back exhaust. I know the theoretical horsepower for stage II is 280; I used the Dyno on my Accessport and I read an average of about 253. I have probably done about 15 Dyno runs and they are all about the same. My question is, why am I not getting close to the HP gains I should have and what would I have to do to improve it.

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    ClubWRX.net Vendor adam@kronosperformance's Avatar
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    The answer is...its not accurate. Don't use any of those "electronic dynos" as gospel.
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    Registered User xFalleNx's Avatar
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    The "dyno" feature on the AP is extremely inaccurate. I did it once and got close to like 450....If you want a definite accurate number, find a local place that does dyno runs. Shouldn't cost too much.
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    and the Funky Bunch Calvinball's Avatar
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    ^ what these guys said.

    The best way to determine the gains your mods gave is to dyno before and after on the same dyno.
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    Sammich Makin' Pwincess wrxtreme06's Avatar
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    When I had my Cobb stage 2 06 w/ invidia catless TBE, I made 241whp on a dynojet and 220ish on a mustang dyno.


    Like the others said though, you'll need to go to a local dyno for accurate numbers. Every dyno will be different.
    Last edited by wrxtreme06; 09-12-2012 at 08:17 AM.

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    Registered User Dirty Bucket's Avatar
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    Quote Originally Posted by xFalleNx View Post
    The "dyno" feature on the AP is extremely inaccurate. I did it once and got close to like 450....If you want a definite accurate number, find a local place that does dyno runs. Shouldn't cost too much.
    I don't recall how it happened, but I remember mine saying 1,100 HP once.

    Do you think I am getting close to 280? I did notice a huge difference when I went to stage II.

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    Registered User A265's Avatar
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    Don't worry about peak numbers, every dyno reads different. As long you are seeing a difference between stock and stage 2, you are golden.

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    Registered User Dirty Bucket's Avatar
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    Just on a side note, what would you guys recommend next for reasonably priced mods? I dont really want To get in to anything too expensive, but I'm looking to improve performance more.

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    ClubWRX.net Vendor adam@kronosperformance's Avatar
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    Quote Originally Posted by Dirty Bucket View Post
    Just on a side note, what would you guys recommend next for reasonably priced mods? I dont really want To get in to anything too expensive, but I'm looking to improve performance more.
    This:

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    and the Funky Bunch Calvinball's Avatar
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    Quote Originally Posted by Dirty Bucket View Post
    Just on a side note, what would you guys recommend next for reasonably priced mods? I dont really want To get in to anything too expensive, but I'm looking to improve performance more.
    Have you done anything handling-wise? Or are you just interesting in moar powah?
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    Registered User Dirty Bucket's Avatar
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    I have done nothing for handling, except for slotted front rotors. I don't really see a need for it because I'll never take it to a track, although it would be nice.

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    Moderator Donkey's Avatar
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    Horsepower questions / low HP gains

    280 is extremely high for whp on a OTS stage II map. Hell even with a custom tune 280 is wishful at best. Cobb's numbers are little misleading at times.
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    Registered User Dirty Bucket's Avatar
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    Quote Originally Posted by Donkey View Post
    280 is extremely high for whp on a OTS stage II map. Hell even with a custom tune 280 is wishful at best. Cobb's numbers are little misleading at times.
    That's a but disappointing, but good to know.

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    The best use of a dyno is to compare before and after. The numbers don't really matter as each dyno can read a bit different, some a lot different. My motorcycle reads between 147 and 161hp depending on the dyno.

    But comparing the power curve to before and after mods can be very useful.

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