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HybridZ

RPM bouncing (3-500) in log, but drives ok


datsun74z_tn

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Hi,

 

I doubt this is just a logging issue but would like to know what you think. I have a 81zxt setup in a 260z (mostly stock) with 450 injectors, 82 dizzy with vg30 wheel, intercooled running 9PSI. Most of the car drives fine but not perfect. It pulls strong in the 2000-4000 range but after that is feels flat, sometimes hesitates. I believe I'm running a little lean and my wideband sensor is bad. The issue I'm seeing is the RPM line is not steady at any time while I'm data logging. I can't figure it out. All of my sensors are shielded wiring including TPS, CAS, CLT, and intake temp. I don't recall seeing the tach bouncing like this at all. My trigger wheel is setup as basic wheel. Have put about 100 or so miles on the setup. Starts up pretty good but I've been trying to tune full load issues. Any ideas? Thanks in advance. I hope my attachments work.

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post-5625-0-74776000-1457239136_thumb.jpg

datsun74z_tn_msq_zip.zip

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