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Dyno plots....some time back there was a Chicago dyno day. I posted #'s and people asked for the...

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Old 03-10-2006, 05:23 AM
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Default Dyno plots....some time back there was a Chicago dyno day. I posted #'s and people asked for the...

actual plots so they could see the curves.

It took some time but I just got mine e-mailed to me.

Here it is (the runs were done within 2 minutes of each other - all of the other cars that day lost lots of power between runs also - bad fans maybe?)......
<img src="http://img.photobucket.com/albums/v294/jasons4/Jason_Friedlander.jpg">

FWIW, this was with my homebrew stage III (plain KO4s with MBC/TCD, GIAC XR, 93 octane).

Oh, here's the plot from my Trailblazer SS (stock is has 395hp at the crank and 400ft-lbs):
<img src="http://img.photobucket.com/albums/v294/jasons4/Jason_Friedlander2.jpg">
Old 03-10-2006, 05:28 AM
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Default to clarify, you are running stock IC's right?

and what psi?
Old 03-10-2006, 05:36 AM
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no, he has RS4s.
Old 03-10-2006, 05:40 AM
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curves look pretty good to me
Old 03-10-2006, 05:48 AM
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Default really? I would think the curve wouldn't drop off so much.

It seems as though he's pretty rich &gt; 4000 but damn.. that's quite a large fall.
Old 03-10-2006, 06:02 AM
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the power curve or tq curve? power doesnt seem to fall off *that* much.
Old 03-10-2006, 06:12 AM
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Default Homebrew cars typically fall off a little in the last few hundred RPM. Tuner kits increase duty

cycle in the upper RPM to compensate for TIP and falling turbo efficiency.
Old 03-10-2006, 06:30 AM
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as djillusion said below - RS4 ICs. Running 23psi tapering to ~20.
Old 03-10-2006, 06:34 AM
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Default looks like I could lean it out a bit.....I haven't messed with things in a LONG time....

I've been very happy with the way the car is performing now. The thing pulls like a freight train.

I would LOVE to have "real" software, no MBC, no TCD without a drop off in the torque curve like that....But, I've tried that and it didn't work as well as what I have now...

I'd like to have the car custom tuned....the thing is, at what point do you reach the law of diminishing returns?

I paid sticker for the car in '00, put lots of money into since then and it now has 133,000 miles on it...At some point, I need to draw the line (just haven't found that point yet!).
Old 03-10-2006, 06:44 AM
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Default Chris is right. Eliminating a bit of that taper would probably solve both the a/f and the torque

dropoff. Got avc-r I love mine.


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