Guide looks really good Paul. : thumbs:
Announcement
Collapse
No announcement yet.
The Dummy's Guide to Direct Ignition & Coil-Packs etc
Collapse
This is a sticky topic.
X
X
-
Rev03 added... Also I got some testing time today with lots of scope waveforms to capture on the next iteration. The highlights confirm a 4ms dwell time and 350-400V primary voltage. Testing involved a highly modified biscuit tin lid, but enough on that for now ;-)
Latest version is http://www.s2forum.com/forum/showthr...d=1#post819249Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
Comment
-
Originally posted by S2central.net View PostRev03 added... Also I got some testing time today with lots of scope waveforms to capture on the next iteration. The highlights confirm a 4ms dwell time and 350-400V primary voltage. Testing involved a highly modified biscuit tin lid, but enough on that for now ;-)RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avant
Comment
-
Quick video of testing yesterday - http://youtu.be/CGXY2rDG3j4 - for the uninitiated, those pulses get closer together as the revs rise.
Note how the ignition pulses from the ECU (for cylinder 1) stay the same width (yellow trace) and the scope picks up the ~400V spike on the primary winding most of the time.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
Comment
-
Rev4 attached has some more screen shots from the 'scope testing done in situ yesterday along with a bunch of fault-finding steps.
Next stage is to hook up the emulator to the ECU and verify that I have found the dwell table and do a bunch more bench tests... someone donated a set of OE coils & loom to scientific research which is going to be very helpful - especially now I can simulate the ignition trigger signal with a test set.Attached FilesPaul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
Comment
-
wow, you update them faster than most people read
Originally posted by S2central.net View Post.... from the 'scope testing done in situ .
Comment
-
Just look at the scales on my pictures - that shows timebase of interest for engine signals... and voltage levels on the two inputs. A good modern scope will generally get you pretty close with an 'auto set' button. However, suggest you search youtube etc for instructional videos if you are really new to such devices.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
Comment
-
Originally posted by S2central.net View Post... However, suggest you search youtube etc for instructional videos if you are really new to such devices.
I have this youngtimer:
Attached Files
Comment
-
That one reminds me of school physics lab, but it's actually perfectly usable for car applications. To get started - set timebase to 50ms and connect probe 1 to G28 (rpm) and set range to 5v per division. Setup for ac coupling and you should see nice sawtooth wave when engine idling.
You need to experiment a bit with trigger levels etc for the G4 pulse and ignition triggers depending what range you are looking for.Paul Nugent
Webmaster http://S2central.net
Administrator http://S2forum.com
1994 S2 Coupe ABY - aka Project Lazarus
2001 A6 allroad 2.5TDi - family tank
2003 S4 Avant 4.2 V8 - daily burble
Purveyor of HomeFries and Exclusive agent for Samco hose kits (S2/RS2)
There are only 10 kinds of people that understand binary - those that do, and those that don't
Comment
Comment