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Old 12-13-2011, 08:33 PM   #1
b1aze
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2010 Alpine 135i

Default 4th Gear pull log 2011 STI

https://docs.google.com/spreadsheet/...VI3dW1VWElDWkE

Wicked Innovations Stage1 Tune

Conditions:
Relatively flat and straight onramp
Ambient temp was ~35*F

I was up at well well beyond posted speed limits, so i didnt finish at redline, but i feel i got a good log.

Why does my timing keep increasing .5*? Looking back, i probably should have logged FBKC and my AFR has no meaning at this point.

Why is my peak boost at ~31.5 at where my boost usually peaks, but my manifold pressure is at just under 17. My boost gauge reads 20.5PSI at max boost.

Why is my WGDC increasing while my overall boost pressure decreases over the rpm range?

I had read elsewhere that MAF is a good representation of WHP. What would my MAF readings mean in approx WHP?

IAM doesnt change, but that doesnt mean much without the other knock observing parameters.

I really appreciate any insight and help with this.

DP
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Last edited by b1aze; 12-14-2011 at 07:05 AM.
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Old 12-13-2011, 10:02 PM   #2
Airboy
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The item "Boost Pressure Actual, psi" looks to be the absolute manifold pressure. The "Manifold Relative Pressure" is your boost.

The 20.5psi peak that you saw from the boost gauge, is that a "peak hold" value that you recall with a button? Could be from a boost spike between shifts.

The stock turbo will drop off in boost at higher rpm.

After peak boost, ignition advance, in general, will increase with rpm.

Your log appears to be 3rd gear, based on the elapsed time for the run.
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Old 12-13-2011, 10:28 PM   #3
b1aze
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The 20.5 is the pressure that I can get in gears 3-6 for any rpm from 3500ish-5k at WOT depending on the incline/load. It holds pretty well as much as I can monitor it while pulling.

I know it was a 4th gear pull as I hit about 115mph just before I let off the throttle.

I have no engine mods aside from a turbo blanket and a stage1 tune.
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Old 12-13-2011, 10:58 PM   #4
Airboy
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What does your boost gauge read when engine is OFF, and what does it read at idle?

Did you make any other logs? The log you posted took ~6.7 seconds to go from 2400 to 6400 rpm, too fast to be 4th gear.
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Old 12-13-2011, 11:04 PM   #5
b1aze
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It's a prosport premium gauge reading pinned at bottom when off at 21 inHG when idle warm. I have a couple other logs, and will sort through them tomorrow and can post them up.

I can do a pull tomorrow in similar conditions and post it up.
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Old 12-14-2011, 07:08 AM   #6
b1aze
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Sorry Airboy, you were 100% correct. It did take far too short of a time to run from 2500-RL. I updated the first post with an actual 4th gear pull :P which took approx 12seconds, which sounds just about right.

I still dont really understand why my manifold pressure would be that much lower than what my boost gauge is reading. That doesnt mean boost leak, does it?
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Old 12-14-2011, 01:41 PM   #7
Phatron
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boost gauges almost always read 2-4 psi higher than the value logged via the ecu.
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Old 12-14-2011, 04:48 PM   #8
b1aze
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So is the boost gauge correct or is the ECU the correct pressure? Does it matter?
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Old 12-14-2011, 04:54 PM   #9
Phatron
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ignore the gauge. To tune the car you need to use the boost that the ecu is using.....all the turbo dynamics and wgdc corrections are using the ecu boost.
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Old 12-14-2011, 04:57 PM   #10
b1aze
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Oh ok. So is the boost gauge really only valuable to tell you if you have a vacuum/boost leak?
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Old 12-14-2011, 05:03 PM   #11
Phatron
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well....once you set the boost with the ecu and see what the gauge is reading....you will still be able to watch for overboosting with the gauge.
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