×

Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

Engine Speed Trigger

General Tuning Discussion

Forum Posts

Courses

Blog

Tech Articles

Discuss all things tuning in this section. News, products, problems and results. 

= Resolved threads

Author
459 Views

Link G4+ x - 88Nissan 300zx - trying to resolve Engine Speed Fluctuation. Nissan optical CAS, swapped 360 to a 24+ disk. 2000rpm -3000rpm - up to 100rpm to 200rpm swing, 3000-4000 - up to 200 to 300 swing, 4000-5000 - up to 300-400 swing, 5000-6000 - up to 500 to 600 swing. Watched webinar 95 & 96. Helped but did not resolve. Need some guidance.

So, is the engine speed actually changing (so a misfire or severe timing change), or is just the engine sensor indicating a change when none is occurring? Are you observing this change on the laptop connected to the ECU (so you could log it and share that), or is it just on a tachometer?

What conditions are you testing -- unloaded free-reving? Steady state loaded -- either driving on the road, or on a dyno?

No backfire, smooth running. See photo of log attached

Attached Files
  • DD8286D6-D284-4F21-BC88-A548E607FD7B.jpeg
  • Attachments may only be downloaded by paid Gold members. Read more about becoming a Gold member here.

More - engine speed is smooth, no backfire, photo of log attached. Light load driving, no high rpm log done, yet. Lap top rpm gauge flutters like the log. Should I attach the log file.

Attached Files

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?