MicroSquirt.com read only forum (Jan.15,2018)

Hey guys - i just realized something on another website (e30tech.com) they were talking about injection # per cycle. I am runnin a 4 stroke 6 cyl with alternating staging, 2.5L 6 cylinder with 6 high impedence 42#/hr (440cc) injectors on 2 injections per engine cycle and I have noticed that it seems a little tricky to get the idle to stay in the stoich area. It could be that I am bouncing between two bins (moved the bins, now I am not bouncing...) or something. I set the bin to 39 VE at all four corners so tha there is no interpolation of VE in the idle bin hoping the car would find a AFR and just stay there, but that doesn't happen. I am wondering if my 2 injections per engine cycle is too short for the larger injectors. Should I switch to single injection per cycle? Will the car run any different on load? Will there ever not be enough fuel (since this is not sequential injection)?

If you´re pending around 2ms pulswidth at idle you should try the hi-res code , my machine was doing a bit like yours but when i switched to hi-res 08 it disappeared.

Also.... setting the bins to the same value doesn´t mean that the afr:s are the same at slightly different kpa:s around idle, not for me anyways. I´ve carefully adjusted them so that when the engine runs a little "easier" and therefor goes down in kpa:s the ego correction doesn´t bear off on the wrong direction.

A bit tricky but when all is set it works lika a charm, it´s important that when the kpa:s go down in value that the bins are somewhat lower there so that the egocorrection doesn´t have to overcompensate to the leaning out direction, cause when it has to do that the engine will start to have a rough idle that tend to hunt a bit and the egocorrection swings wildly up and down.

I´ve HAD to finetweak this and some other areas by hand, none of the "auto mapping helpers" like autotune or the feature in megalogviewer has doned this right.

snillet wrote:If you´re pending around 2ms pulswidth at idle you should try the hi-res code , my machine was doing a bit like yours but when i switched to hi-res 08 it disappeared.

Also.... setting the bins to the same value doesn´t mean that the afr:s are the same at slightly different kpa:s around idle, not for me anyways. I´ve carefully adjusted them so that when the engine runs a little "easier" and therefor goes down in kpa:s the ego correction doesn´t bear off on the wrong direction.

A bit tricky but when all is set it works lika a charm, it´s important that when the kpa:s go down in value that the bins are somewhat lower there so that the egocorrection doesn´t have to overcompensate to the leaning out direction, cause when it has to do that the engine will start to have a rough idle that tend to hunt a bit and the egocorrection swings wildly up and down.

I´ve HAD to finetweak this and some other areas by hand, none of the "auto mapping helpers" like autotune or the feature in megalogviewer has doned this right.

I believe I have a 2.0MS PW @ idle. This could be my issue with the hunting AFRs. What is this hi-res code you talk about? I run MSnS-E 029s. Woudl changing to 1 squirt fix my issue?

snillet wrote: If you´re pending around 2ms pulswidth at idle you should try the hi-res code , my machine was doing a bit like yours but when i switched to hi-res 08 it disappeared. Also.... setting the bins to the same value doesn´t mean that the afr:s are the same at slightly different kpa:s around idle, not for me anyways. I´ve carefully adjusted them so that when the engine runs a little "easier" and therefor goes down in kpa:s the ego correction doesn´t bear off on the wrong direction. A bit tricky but when all is set it works lika a charm, it´s important that when the kpa:s go down in value that the bins are somewhat lower there so that the egocorrection doesn´t have to overcompensate to the leaning out direction, cause when it has to do that the engine will start to have a rough idle that tend to hunt a bit and the egocorrection swings wildly up and down. I´ve HAD to finetweak this and some other areas by hand, none of the "auto mapping helpers" like autotune or the feature in megalogviewer has doned this right. I believe I have a 2.0MS PW @ idle. This could be my issue with the hunting AFRs. What is this hi-res code you talk about? I run MSnS-E 029s. Woudl changing to 1 squirt fix my issue?
BMW M50 Non Vanos 24v 2.5L Turbo MS-1 V3 running fuel and spark on MSnS-E 029s


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Check in to the msns-e 1 /development area on the forum and you´ll find the thread.

Last version is in the first post. But it´s not considered "finished" yet though.

It´s based mainly on the 029 code though so i should not worry to much. The only function taken out of the extra code to make room for the hi-res improvement is the PWM control for the injector current but since you´re running hi-z injectors that shouldn´t be a problem

It´s just as stable as the 029q2 was for me before i changed.

snillet wrote:Check in to the msns-e 1 /development area on the forum and you´ll find the thread.

Last version is in the first post. But it´s not considered "finished" yet though.

It´s based mainly on the 029 code though so i should not worry to much. The only function taken out of the extra code to make room for the hi-res improvement is the PWM control for the injector current but since you´re running hi-z injectors that shouldn´t be a problem

It´s just as stable as the 029q2 was for me before i changed.

Ok I will check it out - is there any new settings that I need to use to take advantage of the high res injection? Like, is it a feature that goes un noticed except in car performance or do I have to set it up or anything? Also, does it make that much of a difference?

snillet wrote: Check in to the msns-e 1 /development area on the forum and you´ll find the thread. Last version is in the first post. But it´s not considered "finished" yet though. It´s based mainly on the 029 code though so i should not worry to much. The only function taken out of the extra code to make room for the hi-res improvement is the PWM control for the injector current but since you´re running hi-z injectors that shouldn´t be a problem It´s just as stable as the 029q2 was for me before i changed. Ok I will check it out - is there any new settings that I need to use to take advantage of the high res injection? Like, is it a feature that goes un noticed except in car performance or do I have to set it up or anything? Also, does it make that much of a difference?
BMW M50 Non Vanos 24v 2.5L Turbo MS-1 V3 running fuel and spark on MSnS-E 029s


Posted by email.

Jon k wrote:

snillet wrote:Check in to the msns-e 1 /development area on the forum and you´ll find the thread.

Last version is in the first post. But it´s not considered "finished" yet though.

It´s based mainly on the 029 code though so i should not worry to much. The only function taken out of the extra code to make room for the hi-res improvement is the PWM control for the injector current but since you´re running hi-z injectors that shouldn´t be a problem

It´s just as stable as the 029q2 was for me before i changed.

Ok I will check it out - is there any new settings that I need to use to take advantage of the high res injection? Like, is it a feature that goes un noticed except in car performance or do I have to set it up or anything? Also, does it make that much of a difference?

It´s just "there" when you switch to that codeversion, it´s just like switching to any newer extra code so it´s nothing tricky.

I even loaded in my old 029q2 msq file, it did protest about errors in audit log but after i saved it and reloaded it again nothing went wrong. Although you should experience som need for remapping, since the calculation of the pw is more precise. Read the thread i was talking about earlier and you will understand that part...

The only difference you´ll notice when opening MT is that the numbers on the PW meter has more decimals....

snillet wrote:

Jon k wrote:

snillet wrote:Check in to the msns-e 1 /development area on the forum and you´ll find the thread.

Last version is in the first post. But it´s not considered "finished" yet though.

It´s based mainly on the 029 code though so i should not worry to much. The only function taken out of the extra code to make room for the hi-res improvement is the PWM control for the injector current but since you´re running hi-z injectors that shouldn´t be a problem

It´s just as stable as the 029q2 was for me before i changed.

Ok I will check it out - is there any new settings that I need to use to take advantage of the high res injection? Like, is it a feature that goes un noticed except in car performance or do I have to set it up or anything? Also, does it make that much of a difference?

It´s just "there" when you switch to that codeversion, it´s just like switching to any newer extra code so it´s nothing tricky.

I even loaded in my old 029q2 msq file, it did protest about errors in audit log but after i saved it and reloaded it again nothing went wrong. Although you should experience som need for remapping, since the calculation of the pw is more precise. Read the thread i was talking about earlier and you will understand that part...

The only difference you´ll notice when opening MT is that the numbers on the PW meter has more decimals....

Ok - and one more question, I "believe" my PW is = 2.0 or < 2.0 at idle. I have not log to look at right now but I do recall seeing that in MT. Would that cause instability of my idle afr? I forget what the acceptable minimum PW is.

Additionally, would using the Hi Res code still function with the latest megalog viewer and its VE Analyze function?

snillet wrote: Jon k wrote: snillet wrote: Check in to the msns-e 1 /development area on the forum and you´ll find the thread. Last version is in the first post. But it´s not considered "finished" yet though. It´s based mainly on the 029 code though so i should not worry to much. The only function taken out of the extra code to make room for the hi-res improvement is the PWM control for the injector current but since you´re running hi-z injectors that shouldn´t be a problem It´s just as stable as the 029q2 was for me before i changed. Ok I will check it out - is there any new settings that I need to use to take advantage of the high res injection? Like, is it a feature that goes un noticed except in car performance or do I have to set it up or anything? Also, does it make that much of a difference? It´s just "there" when you switch to that codeversion, it´s just like switching to any newer extra code so it´s nothing tricky. I even loaded in my old 029q2 msq file, it did protest about errors in audit log but after i saved it and reloaded it again nothing went wrong. Although you should experience som need for remapping, since the calculation of the pw is more precise. Read the thread i was talking about earlier and you will understand that part... The only difference you´ll notice when opening MT is that the numbers on the PW meter has more decimals.... Ok - and one more question, I "believe" my PW is = 2.0 or < 2.0 at idle. I have not log to look at right now but I do recall seeing that in MT. Would that cause instability of my idle afr? I forget what the acceptable minimum PW is. Additionally, would using the Hi Res code still function with the latest megalog viewer and its VE Analyze function?
BMW M50 Non Vanos 24v 2.5L Turbo MS-1 V3 running fuel and spark on MSnS-E 029s


Posted by email.