datsun74z_tn Posted March 6, 2016 Share Posted March 6, 2016 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. datsun74z_tn_msq_zip.zip Quote Link to comment Share on other sites More sharing options...
datsun74z_tn Posted March 6, 2016 Author Share Posted March 6, 2016 Normally I can find everything with searches but couldn't find this one Quote Link to comment Share on other sites More sharing options...
Namor Posted March 7, 2016 Share Posted March 7, 2016 What all do you have connected to your sensor ground/return, what voltage source are you using for your dizzy connections and what else is connected to that voltage source? Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted March 8, 2016 Share Posted March 8, 2016 Could be interface from unshielded spark plug wires. Quote Link to comment Share on other sites More sharing options...
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