Hi All,
Apologies for my long winded post,
my setup:
-m20b23 manual
-megasquirt 2 currently running fuel only - wired in semi sequential- 2 batches of 3 injectors (complete custom made loom)
-OEM vacuum advance distributor controlling ignition. - Plan is to setup some coils in wasted spark to replace the vacuum distributor eventually
-ngk powerdex wideband
-tunerstudio - paid version for auto tune.
Got the above going yesterday. I cant remember where i got it but i had an m20b25 tune file to work from. I did the required fuel thing for 2.3L and my injectors (which are oem 185cc units according to googling the part number on the injector).
Currently using 1ms injector dead time - no idea if this is correct - seemed like a reasonable number based on research.
I was stuffing about trying to get it to fire and i could get a cough or two. i switched it to untimed injection, which is batch fired and it immediately fired into life. ran really very nicely from this point on.
Got all excited, jumped in the car, drove around for an hour or so and got a fairly good tune on it using the auto tune thing. Drove it 200kims today and further refined the afr target got the accelerating enrich going reasonably well. Engine is very smooth in its power delivery, my brother had a drive and he coudln't make it stumble etc. quite impressed with the outcome so far.
side note: i'm getting like 110 odd VE as a maximum value at approximately peak torque area.
Got home, decided to open up the log file and notice that my injectors are at 98% duty cycle!
98% was at WOT at 6000ish rpm. I guess I didnt rev any higher on that log. but i know i have reved it higher flat out and the AFR looked ok from memory?
So now i start looking into the semi sequential, and trying to work out what to do. I understand the go is to set it to semi sequential and go for 2 squirts alternating.
questions:
- Is 98% duty cycle real and is it an issue? the engine is completely factory, i would have thought the oem injectors would be fine? WOT target afr is 13:1
- should i switch to semi sequential setup? is there any advantage? Internet researching doesn't give a definitive answer. of course full sequential is superiour but hey, need an ms3 for that.
-If i switch to semi sequential is my duty cycle issue going to be worse? I think it will be as you now have twice as many dead times to deal with. But its all a bit confusing.
Any input much appreciated.
Apologies for my long winded post,
my setup:
-m20b23 manual
-megasquirt 2 currently running fuel only - wired in semi sequential- 2 batches of 3 injectors (complete custom made loom)
-OEM vacuum advance distributor controlling ignition. - Plan is to setup some coils in wasted spark to replace the vacuum distributor eventually
-ngk powerdex wideband
-tunerstudio - paid version for auto tune.
Got the above going yesterday. I cant remember where i got it but i had an m20b25 tune file to work from. I did the required fuel thing for 2.3L and my injectors (which are oem 185cc units according to googling the part number on the injector).
Currently using 1ms injector dead time - no idea if this is correct - seemed like a reasonable number based on research.
I was stuffing about trying to get it to fire and i could get a cough or two. i switched it to untimed injection, which is batch fired and it immediately fired into life. ran really very nicely from this point on.
Got all excited, jumped in the car, drove around for an hour or so and got a fairly good tune on it using the auto tune thing. Drove it 200kims today and further refined the afr target got the accelerating enrich going reasonably well. Engine is very smooth in its power delivery, my brother had a drive and he coudln't make it stumble etc. quite impressed with the outcome so far.
side note: i'm getting like 110 odd VE as a maximum value at approximately peak torque area.
Got home, decided to open up the log file and notice that my injectors are at 98% duty cycle!
98% was at WOT at 6000ish rpm. I guess I didnt rev any higher on that log. but i know i have reved it higher flat out and the AFR looked ok from memory?
So now i start looking into the semi sequential, and trying to work out what to do. I understand the go is to set it to semi sequential and go for 2 squirts alternating.
questions:
- Is 98% duty cycle real and is it an issue? the engine is completely factory, i would have thought the oem injectors would be fine? WOT target afr is 13:1
- should i switch to semi sequential setup? is there any advantage? Internet researching doesn't give a definitive answer. of course full sequential is superiour but hey, need an ms3 for that.
-If i switch to semi sequential is my duty cycle issue going to be worse? I think it will be as you now have twice as many dead times to deal with. But its all a bit confusing.
Any input much appreciated.
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