semi-batch on 6 cylinder with v3 outputs

[lastermann]

Hi everyone,

I have 6 cylinder BMW m20 engine, I have already installed a cam sensor and I want to run semi-sequential with v3 outputs and sequential with ms3x outputs as secondary fuel. First off all I receive the error message "megasquirt caanot run semi-sequential with this many cylinders....." I tried all the squirts/staging options possible, my msq file is attached, please somebody tell me where is the problem. Second, can megasquirt run secondary outputs in sequential while the primary is in semi-sequential or batch mode?

Thanks in advance

[jsmcortina]

Hi everyone,

I have 6 cylinder BMW m20 engine, I have already installed a cam sensor and I want to run semi-sequential with v3 outputs and sequential with ms3x outputs as secondary fuel. First off all I receive the error message "megasquirt caanot run semi-sequential with this many cylinders....." I tried all the squirts/staging options possible, my msq file is attached, please somebody tell me where is the problem. Second, can megasquirt run secondary outputs in sequential while the primary is in semi-sequential or batch mode?

Thanks in advance

Neither of those combinations is supported.

James

[racingmini_mtl]

I would add that running sequential on the secondary instead of the primary injectors also does not make much sense. Sequential injection is most efficient at low duty cycle which is where the primary injectors should operate.

Jean

[lastermann]

[/quote]
Neither of those combinations is supported.

James[/quote]

It is ridiculus that MS3 doesn't support semi-sequential on v3 outputs while I have cam sensor installed, I reserved my MS3X outputs for the LPG injectors which I will use 90% percent of the time, as it first needs to start with gasoline till it warms up and I do not want my Engine run like s*** during this period of time.

[jsmcortina]

It is ridiculus that MS3 doesn't support semi-sequential on v3 outputs while I have cam sensor installed,

1. a cam sensor is not used by semi sequential
2. you need three injector outputs to run semi-sequential on a 6 cylinder engine

James

[lastermann]

IBMW m20 originally runs semi batch injectors grouped in 3, so this is 2 banks, I don t understand why megasquirt can t do that, really, someone should explain why megasquirt can't group injectors simply in two banks? and if this is not possible what is this topic about? http://www.msextra.com/forums/viewtopic ... sequential ???

[jsmcortina]

what is this topic about? http://www.msextra.com/forums/viewtopic ... sequential ???

That topic is about MS2.

James

[lastermann]

I thought that ms3 is just a ms3x board added on ms2 , so how is that possible ms3 can't do what ms2 is capable of?

[grom_e30]

megasquirt can do 'batch' injection on the main board drivers 2 banks of 3 injectors i have run that on my ms3 on a m20 that way, it CAN'T do semi sequential on the 2 main board drivers as that would be 3 banks of 2 injectors and there is only 2 drivers.

[lastermann]

megasquirt can do 'batch' injection on the main board drivers 2 banks of 3 injectors i have run that on my ms3 on a m20 that way, it CAN'T do semi sequential on the 2 main board drivers as that would be 3 banks of 2 injectors and there is only 2 drivers.

Thank you Grom_e30, that was really informative, so do you suggest to run 2 of the ms3x channels for batch fire as m20 originally does and run 6 remaining channels for sequential injection of LPG ? so What you mean by mainboard drivcres are the MS3X outputs, right?

[grom_e30]

thats a good question im not overly sure how you will go about that, your main fuel would be the batch fire outputs on the main board same ones as used on a ms2, then your sequential lpg would be injectors a-f on the ms3x card. i would assume have a look at your tune i changed a few things

[lastermann]

Grom_e30, I checked your edited file, You turned off the sequential, use v3 outputs and injectors will fire all at once. thw problem is that engine runs rough with it. I want to mimic what BMW m20 ECU does, group the 6 injectors in 2 banks and fire them in alternating fashion while any group of 3 is about to intake. I guess it is possible with using 2 of MS3X outputs however not sure that they can handle that much of current

[lastermann]

And also there s a option in the "Fuel Settings" menu as "Sequenced Batch Fire" does this work for v3 outputs?

[grom_e30]

turning sequential off makes it 'batch fire', then the squirts a cycle and staging will control how the injectors fire, as far as im aware it should fire bank 1 on the first crank rev then bank 2 on the second crank rev. exactly how its done by bmw. sequenced batch fire means you can have the banks fire at a certain crank angle.

[lastermann]

Thank you , it doesn't ask anywhere for the crank angle, however I will try it, thanks a lot, that really helped

[grom_e30]

Specifies the ignition 'trigger'. Typically try 0 or 1.

Thats what the tool tip said on the later firmware

[lastermann]

And second part of my question, does anybody knows that MS3X outputs runs sequential while primary injectors are alternating in batch? And what about the ignition, can coils run sequentially while primary injectors are not sequented?

[grom_e30]

by the looks of it if you set you secondary fuel to use the 2 main board drivers (for petrol fuel batch fire) you can set your main fuel (lpg) to use the ms3x outputs as sequential. the ignition is a diff matter could be sequential if you have 6 coils on both fuels.