Metering 900 g/s airflow with MAS ???

[CKATM]

Yeh, I looked at all those, I settled on a set of Denso 1600cc 's which I'm looking at now. I wanted a set of ID's, but they don't make the 1600's anymore. Didn't want to go to 2000's to try and retain some idle quality.

[Holden202T]

lol, idle quality, who wants that on a race motor

[antus]

from what I read about IDs the 2000s are a better quality injector with better idle quality. either the 1600s or the 1800s, (cant rember) had some quality issues. the delco supports single file mode for low pulse widths so can get a good idle with the deka 80s, but Ive not seen larger yet.

[CKATM]

Haha, I'm not really that fussed about Idle quality (especially with what I'm used to), but thought it just might make it a little nicer on the street- wasn't a major consideration. Although this is a project I'm putting together for something to so with my 2 girls (one's 15 and the other ones 11), because they're getting interested in cars and the drags). Might be more comfortable for them to ride in (LOL).

I've got the Denso 1600's now, so it's what I'm going to be using.

[CKATM]

Hey THE1,
With your previous coments-

the enhanced mod does alow the use of LS1 MAF

the highest boost i have run it with it is 16psi factory supercharged and it metered the MAF upto a max of 11200hz and it has a range of 14000hz, 10psi usually meters upto around 10000hz, but these obviously lacked engine work which will alter the flow alot.

The problem with vs code atm is there is no spark control beyond 593 cylair, i havn't written the code in for either n/a or s/c bins, if your not worried about the bcm security, then vs/vt are similar in wiring so you could swap to VT ecu and enhanced mod will alow spark control upto the max of the MAF. It could handle 20-25lb but never had anything like that to test it more than that you'd be looking at 4 bar MAP and i dont think even kalmaker goes that high? But good luck to you if you get that power out of a v6

I had a look at the link you provided https://pcmhacking.net/forums/viewtopi ... =27&t=2518 when you talk 593 cylair, is that different to the spark power enrichment vs MAF G/F table ?? (Have to excuse my ignorance because I haven't seen been able to look at the physical software yet).

As far as "593 cylair" is this an airflow in G/S ?

Also, When you said "the highest boost i have run it with it is 16psi factory supercharged and it metered the MAF upto a max of 11200hz and it has a range of 14000hz, 10psi usually meters upto around 10000hz" your referring to the MAF output range ??
What frequency would "593 cylair" relate to in hz ??

Cheers.

[charlay86]

The "cylair" variable is Cylinder Air Mass, in milligrams (i.e. the mass of air in each cylinder per combustion cycle).
To convert that to mass air flow you would multiply it by engine speed, and then to get the MAF sensor frequency you would have to look up the frequency curve for the particular sensor.

For VT/VX I have code that allows spark (and fuel) control up to 1650mg/cylinder (possibly higher if necessary) as I have added another set of spark tables.

Currently the other limitation is the mass air flow variable only allows flow rates up to ~511 grams/second.

from a quick google search I have found that there are MAF sensors available that can measure up to 850g/s

[CKATM]

The "cylair" variable is Cylinder Air Mass, in milligrams (i.e. the mass of air in each cylinder per combustion cycle).
To convert that to mass air flow you would multiply it by engine speed, and then to get the MAF sensor frequency you would have to look up the frequency curve for the particular sensor.

For VT/VX I have code that allows spark (and fuel) control up to 1650mg/cylinder (possibly higher if necessary) as I have added another set of spark tables.

Currently the other limitation is the mass air flow variable only allows flow rates up to ~511 grams/second.

from a quick google search I have found that there are MAF sensors available that can measure up to 850g/s

Thanks charlay86,
What did you type for the MAF search on google ?
Also, you saying your code is limited 511g/sec ?
IAm I able to get hold of it ?

[The1]

the enhanced code can run upto 511grams/second with the MAF and max reference freqency of 14000hz as the grams/second value is only referenced in the tune to the MAF frequency output. So rather than looking at flow i tend to look at the input frequency range of the MAF, the current ecu code or hardware currently doesn't like much more than this.

[CKATM]

So does that mean that if it was connected to a MAF with a flow range of 900g/sec and reported its upper limit range of 900g/sec as 14000hz it would work ??

[The1]

correct, if the MAF's range is under 14000hz then with the current code you can change the reference in the tune at any frequency under that between 0-511 G/S

Obviously with rewritten parts of the code it could go higher than 511.

The VS-VY ecu's peak out at 16000hz hardware wise but found a couple on the bench not fully stable over 15000hz and at the time there wasn't any found MAF's that would go above 14000hz so only wrote the code upto that.