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Old 06-26-2013, 02:12 AM   #1
KornShaDoW097
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Member#: 313618
Join Date: Mar 2012
Location: South San Diego
Vehicle:
2004 WRX

Default WHP goals by gear

So I recently hit 395WHP and 383TQ on my 04 WRX and I was wondering if most tuners aim for their goals on 4th gear since it a 1:1? Since my results were in 3rd and lower by 40WHP in 4th.

I don't see a lot of compensation options on my 04's ECU besides WGDC, so thats why I ask. I may just up the targets and WGDC in 4th gear to see if I can match 3rds out put.

Is that a standard technique or is there a "right way" or doing things like this?

I've just always heard to always tune in as close to 4th as possible but I've never heard of what gear to target on the dyno to consider your goal "accomplished".

Thanks

Jon
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Old 06-27-2013, 05:11 PM   #2
OctaneMatt
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Your car accelerates faster in 3rd than in 4th so more energy is lost to rotating intertia. The faster your engine accelerates the wheels/tires/crank, the more power they 'steal' from accelerating the car. This will lead to lower power readings in lower gears.
This is what you're probably seeing.
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Old 06-30-2013, 02:04 AM   #3
wildt267
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Energy is not "lost" in inertia. If that were the case we would all have 3 lb flywheels. Energy is converted from chemical to kinetic through combustion. Energy is lost through heat and noise.
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Old 06-30-2013, 03:39 AM   #4
KornShaDoW097
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Location: South San Diego
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2004 WRX

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I have a lightened exedy flywheel, so maybe the lower inertia in the higher gears is something that that causes the loss since the gears ratio can't help with tq and the inertia isn't enough to sustain its acceleration?

At the same time the turbo should help pick up the slack since its given much more time to spool and even if tq is lost HP shouldn't be affected that much.

Any ways around this or should I base my results off of 3rd? I'm not really too sure what to do with this. I mean do I tune until I hit my goal in 4th or is 3rd the best I can expect?
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Old 06-30-2013, 03:42 AM   #5
KornShaDoW097
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Quote:
Originally Posted by OctaneMatt View Post
Your car accelerates faster in 3rd than in 4th so more energy is lost to rotating intertia. The faster your engine accelerates the wheels/tires/crank, the more power they 'steal' from accelerating the car. This will lead to lower power readings in lower gears.
This is what you're probably seeing.
Wouldn't that mean I'd have more power in 4th since the car is accelerating slower? And I don't know if much is lost in rotating the inertia since its a lighter flyeheel which is supposed to reduce the energy needed in order to rotate it and allow more power to be free for the engine
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Old 06-30-2013, 03:44 AM   #6
KornShaDoW097
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Quote:
Originally Posted by wildt267 View Post
Energy is not "lost" in inertia. If that were the case we would all have 3 lb flywheels. Energy is converted from chemical to kinetic through combustion. Energy is lost through heat and noise.
True. It's mot lost its only stored in inertia, however my light flywheel stores less so in lower gears I'd guess I'd have more power, of course the best power would be at slower accel so the turbo can boost, I'd assume 3rd is the best spot for this reason. Plenty of spool time but a little extra leverage than 4th or a 1:1.

But what's the next step here? If 400WHP is my goal and I've hit 395, do I call it a day or try to make that in 4th?
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