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Post Info TOPIC: Where is the power hidden?


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Where is the power hidden?


All,

 

I dyno'd my 08 busa with full R77 pipe today.  It was on a DynoJet, and the results were lower than I expected.  Pulls were done in 4th gear, and I have been auto tunning.  The AFR was pretty consistant around 13 to 1.  Yet it only pulled 170HP and 101FT.  What can I tweek to gain the other 10 to 15 HP I see others easly get with a full Piped Busa?

Thanks in advance guys, and just as an FYI, I am a site donor



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Was your PAIR system blocked off when reading Afr ?

If not this will cause leaner than actual readings affecting hp.

Have found good gains with changing velocity stacks , had some made from ally that are about halfway between stock and short GSXR stacks.

 Have found the R77 not so good R55 is better , Akrapovic good , Arata best.



-- Edited by LenTurbo on Wednesday 13th of June 2012 05:20:41 AM

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Thanks for the response! Yes the PAIR valve is blocked off and turned off in the ECU Edit interface.

Anything else I can tweak, I know the R77 pipe isn't the highest HP pipe out there, but it's not causing me to leave 20hp and 7ft on the table is it? I've seen others post the numbers with a full pipe and tune. Just wondering whatelse I can do.

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Unless you compare 2 bikes on the same dyno on the same day absolute hp number comparisons dont mean that much.

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Thanks for the response Justin,  I guess what I'm getting at is when people post base line with pipe, and then numbers after the tune, and they tend to jump about 8 to 12HP.  Is it just from them adding fuel and bring them out of a lean state, or are they adding Timing as well?  I tuned mine using your Logbox with autotune.  Just wondering what if anything I can do to get more HP out it?



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Did not forget to disable any limiters?

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The limiters are disabled.

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What was your basline with the stock bin file? if you did some dyno pulls with a stock bin file then compare with the auto tuned bin file you will have a better idea of what improvements you have.



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The power is hidden 4600 ft lower than your current elevation. Even with correction factors, your power may not accurately reflect what it wouldbe at sea level.

Are you using local pump gas? Typically not the best for making power when it is a high altitude blend.

Additionally, SAE correction factors will typically show slightly less power than STD correction factors.

There are gaps in the curve at two points. This sometimes means the coil signal was lost. May be worth looking at a graph vs. speed rather than RPM to see if it is different.

 

If I read teh conditions correctly (which I probably didn't) it is showing 91degrees F, 26.8 in-hg, and 7% humidity but the dyno is only calculating a 1.14 SAE correction factor. If the condifions are correct, the dyno operator does not have the 4600 ft altitude of Linden UT programmed into winpep.  

 

91degrees F, 26.8 in-hg, and 7% humidity @ 4600 ft elevation is a 1.37 SAE correction factor (again, probably too much corerction to be comparable to real sea level tests)

 

What are the run conditions as shown on the chart and the correction factor it predicted?

 

John



-- Edited by sportbikeryder on Thursday 14th of June 2012 03:48:58 AM

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Awesome points John, and thanks for sharing. You are correct with the conditions shown on the chart according to my weather station, the air was = to 6200ft berimetric pressure wise. I guess I figured the dyno would take all this into account. The non corrected HP was 149 and 94FT. Then with the corrections it's what you see on the chart. I'm not sure I that's what you are after or not?

The cuts in the chart were from loss of signal as you suggested, we had a really hard time gettin a solid coil signal. Its a harly shop that had the dyno and he's not used to setting up metric bikes.

Justin, I didn't make any stock bin runs, and I should have....

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There is a setting in winpep (dyno software) where you put your physical elevation in. It changes the SAE correction factors. As mentioned, when the corrections are really high, I don't "trust" them too much.

On my turbo bikes I sometimes lose a signal as well. The HP can still be had by changing the bottom axis to display the speed (mph) rather than use the ignition signal for the rpm. (you won't get a torque trace on teh graph though).

If you use a 1.37 correction on 149hp, it would be 204 hp (I don;t think your bike is making 204 either...)

Dyno's are just a tool, not an absolute, especially when you have conditions such as yours in the high altitude.




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