The Autonerdz Community Forums - CDI Ignition pattern on lean misfire

	Welcome, Guest. Please Login or Register

Home

Help

Member Map

Event Calendar

The Autonerdz Community Forums › › › CDI Ignition pattern on lean misfire

‹ Previous Topic | Next Topic ›

Pages: 1

Send Topic

CDI Ignition pattern on lean misfire (Read 186 times)

James H

Senior Member
Picogroup

Offline

Bike Nerd

Posts: 165

Waterloo
Ontario
Canada
Gender: male

CDI Ignition pattern on lean misfire
Aug 11^th, 2018 at 9:03am

Some of you may find this interesting even thou I am not sure how much you run into Capacitive Discharge Ignition systems. This is a single cylinder 450cc 4 stroke. If you look at the misfire when snapping the throttle you do not see the conventional sloping upwards spark line like you do in a std transistorized system. You can only tell by the higher voltage where the spark line jumps out. Not sure but maybe it would be due to the CDI's "punch thru effect". (normal spark duration I have seen on these systems is about 80 Micro sec)

Suzuki_LTR450_2007_Petrol_20180811-0001.psdata (8913 KB | )

WWW

IP Logged

Spence LSD Guide Picogroup Offline Posts: 8,025 Jeffersonville Pennsylvania USA Gender:	Re: CDI Ignition pattern on lean misfire Reply #1 - Aug 11^th, 2018 at 9:16am Interesting James! I just so happen to be tuning a vehicle on the dyno that has this same style of ignition. This one is MSD and lower rpms and single at high. Doing some testing for some slight high rpm break up.
Back to top	N.B.S. Dilly Dilly! FJB WWW IP Logged

Spence LSD Guide Picogroup Offline Posts: 8,025 Jeffersonville Pennsylvania USA Gender:	Re: CDI Ignition pattern on lean misfire Reply #2 - Aug 11^th, 2018 at 9:17am Looking at your capture was it leaning out or was this after you corrected?
Back to top	N.B.S. Dilly Dilly! FJB WWW IP Logged

James H Senior Member Picogroup Offline Bike Nerd Posts: 165 Waterloo Ontario Canada Gender:	Re: CDI Ignition pattern on lean misfire Reply #3 - Aug 11^th, 2018 at 9:25am Spence, that capture is with it lean on a snap (acceleration) only. It would stutter and miss a bit. Fixed the problem by adjusting the TPS. It was at .48 volts at idle. Set it at .55 Volts and it ran perfect.
Back to top	WWW IP Logged

Spence

LSD Guide
Picogroup

Offline

Posts: 8,025

Jeffersonville
Pennsylvania
USA
Gender: male

Re: CDI Ignition pattern on lean misfire
Reply #4 - Aug 11^th, 2018 at 10:16am

I monitored my A/F and it wasn't that far off the mark. The capture I have was monitoring the ignition primary volts and amps, ignition secondary and WPS watching fuel pressure at the rail.

I was able to pull some timing out to help this setup. Seems to drive through the rpm better but I am still working on it at the time of making this post.

Thanks for posting yours!

N.B.S. Dilly Dilly! FJB

WWW

IP Logged

Spence LSD Guide Picogroup Offline Posts: 8,025 Jeffersonville Pennsylvania USA Gender:	Re: CDI Ignition pattern on lean misfire Reply #5 - Aug 11^th, 2018 at 10:24am By chance did you get a capture of it after you stopped it having the issue?
Back to top	N.B.S. Dilly Dilly! FJB WWW IP Logged

James H Senior Member Picogroup Offline Bike Nerd Posts: 165 Waterloo Ontario Canada Gender:	Re: CDI Ignition pattern on lean misfire Reply #6 - Aug 12^th, 2018 at 5:19pm No, unfortunately time didn't permit.
Back to top	WWW IP Logged

StitchB Super Nerd Picogroup Offline Posts: 1,314 lake stevens Washington USA Gender:	Re: CDI Ignition pattern on lean misfire Reply #7 - Aug 14^th, 2018 at 6:58am Interesting, and like everything what does a good one look like?, and 80micro is nothing like standard ignition so this is your own learning curve, what I call empirical studies. Seems the Pico is working out for James, good for you. Stitch B
Back to top	IP Logged

Pages: 1

Send Topic

‹ Previous Topic | Next Topic ›

« Home

‹ Board

Top of this page

Autonerdz forums