- Tue Aug 29, 2023 7:35 am
#64650
Hello Forum.
My name is Stewart. 43 years this year as a mechanic in Queensland, Australia. I hit 60 years old this year and I'm still kicknig'!
After losing data, notes and my mind, I have realised that, sharing and keeping information up to date, is a smart thing to do. I still work, but as a Trainer and Assessor in a Trade College, my hands are worn out for full time spanner work.
I hope someone can benefit from this information.
I share a Snip image of an achievement in, tuning Engine Management. Hard won and years of hands on learning have gone into this result.
I'm sharing this to hopefully bring the humble mechanic's thinking to, understanding the magic of logging data and reading it. One of the many projects I have done, this car I saved for myself.
It is a Turbo-Water/Air charge cooler-2.2l 4cyl engine running the Link G3 from 15 plus years ago. I run 170 kpa on boost control, AC, 4 wire idle valve, wasted spark and batch fuel, in semi sequential. The spark table directly relates to when my batch injectors open. 1-4 coil fires, 1-4 injector opens. Works great, can idle to 500rpm and pull to 7000. Intake and combustion chamber work, custom billet cam, 282 seat to seat duration. (Mechanic went overboard!)
Using a fast wideband O2, which I measured against the gas analyser I have, managed a smooth tune running 10.3 compression, 170kpa MAP. 12 AF to 15 AF running smooth and not, breaking any engine parts.
A Wideband O2, which is very fast in heating up before engine start, and very fast in the accurate data output, is one of the most important tools to use, I found. Check Spartan and what, Everything Fuel Injection have created.
If anyone is interested, the file attached can show me many things to consider.
#Battery volts,
# wide band,
# inj duty cycle ( which is the number used in the base fuel table),
# spark point,
# seconds,
# rpm, etc.
I am not quite finished with the tune but, I am very close. No fuel enrichment for acceleration, I have Crank, Post start, warm upon ECT and, that's it. Manifold Guage Pressure (MGP) TABLE FOR FUEL. No Baro compensation, no IAT no other trim to the Base Table for the base tune.
I can see the AR, rate of RPM change, MAP, Spark timing and even a Trigger error log. Through Tuner Studio we even have a cool Idle Timing table which I have used in a Turbo Mini Moke build with terrific success.
I did find the perfect 14.5 AR at idle as well. The engine is a bit more rally that street design so, idling at Stoich is not going to happen easily. I run it at 14.3 btdc at idle and reached a smooth 14.7 AR, however, it didn't make enough torque to hold the AC well. Incidentally, cam intake timing at 1.25mm open is 14 deg btdc. (Just as a bit of info). Smooth idle is at 22 btdc and 12 AR. Works nice.
Anyhow, I hope this bit of info can open the door to some of the technical approaches, an old mechanic will use to find his MoJo again.
My name is Stewart. 43 years this year as a mechanic in Queensland, Australia. I hit 60 years old this year and I'm still kicknig'!
After losing data, notes and my mind, I have realised that, sharing and keeping information up to date, is a smart thing to do. I still work, but as a Trainer and Assessor in a Trade College, my hands are worn out for full time spanner work.
I hope someone can benefit from this information.
I share a Snip image of an achievement in, tuning Engine Management. Hard won and years of hands on learning have gone into this result.
I'm sharing this to hopefully bring the humble mechanic's thinking to, understanding the magic of logging data and reading it. One of the many projects I have done, this car I saved for myself.
It is a Turbo-Water/Air charge cooler-2.2l 4cyl engine running the Link G3 from 15 plus years ago. I run 170 kpa on boost control, AC, 4 wire idle valve, wasted spark and batch fuel, in semi sequential. The spark table directly relates to when my batch injectors open. 1-4 coil fires, 1-4 injector opens. Works great, can idle to 500rpm and pull to 7000. Intake and combustion chamber work, custom billet cam, 282 seat to seat duration. (Mechanic went overboard!)
Using a fast wideband O2, which I measured against the gas analyser I have, managed a smooth tune running 10.3 compression, 170kpa MAP. 12 AF to 15 AF running smooth and not, breaking any engine parts.
A Wideband O2, which is very fast in heating up before engine start, and very fast in the accurate data output, is one of the most important tools to use, I found. Check Spartan and what, Everything Fuel Injection have created.
If anyone is interested, the file attached can show me many things to consider.
#Battery volts,
# wide band,
# inj duty cycle ( which is the number used in the base fuel table),
# spark point,
# seconds,
# rpm, etc.
I am not quite finished with the tune but, I am very close. No fuel enrichment for acceleration, I have Crank, Post start, warm upon ECT and, that's it. Manifold Guage Pressure (MGP) TABLE FOR FUEL. No Baro compensation, no IAT no other trim to the Base Table for the base tune.
I can see the AR, rate of RPM change, MAP, Spark timing and even a Trigger error log. Through Tuner Studio we even have a cool Idle Timing table which I have used in a Turbo Mini Moke build with terrific success.
I did find the perfect 14.5 AR at idle as well. The engine is a bit more rally that street design so, idling at Stoich is not going to happen easily. I run it at 14.3 btdc at idle and reached a smooth 14.7 AR, however, it didn't make enough torque to hold the AC well. Incidentally, cam intake timing at 1.25mm open is 14 deg btdc. (Just as a bit of info). Smooth idle is at 22 btdc and 12 AR. Works nice.
Anyhow, I hope this bit of info can open the door to some of the technical approaches, an old mechanic will use to find his MoJo again.
Attachments
Screenshot 2023-08-29 173749.png (2.89 KiB) Viewed 5550 times
link g3 pug 404 Screenshot 2023-08-29 161803.png (22.21 KiB) Viewed 5553 times