Why the dip.

Discussion about ECU Tuning Products and Theories
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modulation
240sx Wannabe
Posts: 114
Joined: Fri Jun 12, 2015 4:55 pm

Why the dip.

Post by modulation »

On the VIRTUAL DYNO run in blue what would cause the large dip in power between 4500-5300 rpms? It's possible I was going up a hill I guess but I don't think so. he blue run has boost turned up about 1.5 psi over the other two, and they were all on different stretches of road.

My current thinking is timing must be the culprit?

I attached the tune/log graphs of the blue run as well.
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Fullscreen capture 7152016 113746 AM.bmp.jpg
Fullscreen capture 7152016 120745 PM.bmp.jpg
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p00t
Encyclopedia-Nissan
Posts: 1170
Joined: Sun Aug 28, 2005 10:27 pm
Location: Detroit

Re: Why the dip.

Post by p00t »

AFR and MAF dont dip there so the motor is taking in the same amount of air/fuel. Is your knock sensor active? What is your actual timing during the pull? 16° Steady?

Do more than 1 run if you want to compare two different scenarios. 3 of each would be best on the same piece of road, same direction, on the same day. Otherwise don't try to use it to compare. The wind blows, or the road dips, your engine looks like its low on power.
Current Experiment: Project Twin-Charge 2022
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