Injector IFR Scaling

[boostls2]

That one system is variable.

No idea what this post means?

[07MontRedcp]

http://www.hptuners.com/forum/showthread.php?t=8632

2.5 Bar MAP - Speed Density (E38 ECM)This enhancement contains the following features:
2.5 bar (255 kPa) max MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
Rescaled High MAF table supports up to 15400 Hz with 300 Hz resolution, also supports airflow up to 1024 g/sec
New VE tables with 33 x 33 cell resolution each and configurable MAP and RPM axes (choose your own resolution)
Charge Temperature based VE multiplier table, configurable axis
TPS based VE multiplier table, 33 x 17 cells with configurable TPS and RPM axes
MAP referenced "Boost Enrich" table
Boost Enrich MAP threshold and hysteresis value
Both MAF and Speed Density mode supported
Boost based fuel cut, selectable MAP threshold cuts fuel to all cylinders when exceeded
Rescaled fan temperature axis 163-250F (73-121C), stock is 192-250F (89-121C)

BJK

[boostls2]

http://www.hptuners.com/forum/showthread.php?t=8632

2.5 Bar MAP - Speed Density (E38 ECM)This enhancement contains the following features:
2.5 bar (255 kPa) max MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
Rescaled High MAF table supports up to 15400 Hz with 300 Hz resolution, also supports airflow up to 1024 g/sec
New VE tables with 33 x 33 cell resolution each and configurable MAP and RPM axes (choose your own resolution)
Charge Temperature based VE multiplier table, configurable axis
TPS based VE multiplier table, 33 x 17 cells with configurable TPS and RPM axes
MAP referenced "Boost Enrich" table
Boost Enrich MAP threshold and hysteresis value
Both MAF and Speed Density mode supported
Boost based fuel cut, selectable MAP threshold cuts fuel to all cylinders when exceeded
Rescaled fan temperature axis 163-250F (73-121C), stock is 192-250F (89-121C)

BJK

Im 90% sure the only option was for custom 2bar OS, but I will check again tonight. If this 2.5 option is avail then this seems for sure the way to go!

[07MontRedcp]

Im 90% sure the only option was for custom 2bar OS, but I will check again tonight. If this 2.5 option is avail then this seems for sure the way to go!

Don't go by what it says is available, they use one generic term for all. Look at the link I gave you. IF you have an e38 ecm then you can use any MAP sensor from a 1 bar to a 2.5 bar, the OS adjusts to the values (linear and offset) you enter.

BJK

[DSteck]

*facepalm*

[boostls2]

Don't go by what it says is available, they use one generic term for all. Look at the link I gave you. IF you have an e38 ecm then you can use any MAP sensor from a 1 bar to a 2.5 bar, the OS adjusts to the values (linear and offset) you enter.

BJK

Okay I confirmed, the only one available is "2 Bar MAP - Speed Density". Yes I know I can use a 2.5 OS with a 2bar sensor and just tune the VE around it or use a 2 bar sensor with a 2.5 sensor vice versa, etc etc yes I know this, but from the link you gave me, only the 2.5 OS has the extended MAF range.

The 2bar OS states nothing about this.

Unless you are saying that even in the E38, the "2 Bar MAP" OS WILL IN FACT CONTAIN the 15k extended maf range. But honesly if we go with the 2bar tune then we wont really worry too much about maf anyway and just tune the boost in the Boost enrichment table.

[boostls2]

IF you have an e38 ecm then you can use any MAP sensor from a 1 bar to a 2.5 bar, the OS adjusts to the values (linear and offset) you enter.

BJK

I think I see what you're saying. I was just interpreting it as the 2.5 OS gives you the extended maf range, whereas the 2bar OS does not. I guess I will have to just try the 2bar OS and see if it does...

[07MontRedcp]

I think I see what you're saying. I was just interpreting it as the 2.5 OS gives you the extended maf range, whereas the 2bar OS does not. I guess I will have to just try the 2bar OS and see if it does...

Yeah, now you're getting it. That is why I put that one sentence in bold. It says "UP TO A MAXIMUM 2.5 BAR". The MAF range axis can also be changed to a maximum of 15.5 khz. "Rescaled High MAF table supports up to 15400 Hz with 300 Hz resolution, also supports airflow up to 1024 g/sec".

BJK

[boostls2]

Yeah, now you're getting it. That is why I put that one sentence in bold. It says "UP TO A MAXIMUM 2.5 BAR". The MAF range axis can also be changed to a maximum of 15.5 khz. "Rescaled High MAF table supports up to 15400 Hz with 300 Hz resolution, also supports airflow up to 1024 g/sec".

BJK

Yeah but you can see how that was confusing... I just applied the OS and I see the 15.5k now! Thanks a lot, this is great. I will just use the stock map for now since we're only pushing 8psi through it, but I know its gonna exceed 12k.

[07MontRedcp]

Yeah but you can see how that was confusing... I just applied the OS and I see the 15.5k now! Thanks a lot, this is great. I will just use the stock map for now since we're only pushing 8psi through it, but I know its gonna exceed 12k.

You are not the first to be confused, it happened to me also.

As for the MAF frequency, you do realize that you will also need a maf sensor that is capable of 15.5 kHz. I'm pretty sure the LS7 sensor can handle that frequency.

BJK

[boostls2]

DSteck, with this OS I now have Normal IMRC closed and Normal IMRC Open VE tables. What does what, and what is the best way to come up with a base VE to start out with? I read something about bluecat?

[jpracing01]

OK so for a 190lb injectors with e85, I could divide the IFR by 3 (190/3=63.3) and multiply the stoich by 3 (9.7*3=29.1)

[boostls2]

OK so for a 190lb injectors with e85, I could divide the IFR by 3 (190/3=63.3) and multiply the stoich by 3 (9.7*3=29.1)

Pretty much. It is working solid for me with the 85#. I basically left the stock Z06 IFR values around 41 and doubled the stoich and it ran like a top with fuel trims under -+ 5 right off the bat..

[mourat]

Silly question, so if I want to be able to use the IFR multiplier, I have to upgrade the OS in my e38 (2007 c6 corvette) to a 2 bar map speed density enhancement? cuz i dont see anything that says IFR in hp tuners now, and injectors are 80lb.

I'm only running 6psi boost, do I need to upgrade? Also, is IFR just injector flow rate table?

and if thats the case, since injectors are 80lb, i'd put 40lb in my injector flow rate vs. press table, and where it says "air fuel ratio" i click on "stoich" and multiply that talbe all by 2?

when i do that i get numbers like:
29.356445, 28.644531, 27.931641 etc...

says its for vehicles with duel fuel option, is that still the right table?

thanks in advance!

[castorjames]

Does this: "Multiply IFR by 0.5, multiply stoich fuel ratio by 2. Done. " can be used on LS1B pcm? does it scale the 500g limit on the maf too? i want to run maf on a turbo setup, im hitting the 12,000hz limit, looks like this is solved using card style maf on a 4" pipe right? but im close on the 500g limit too, thats why i ask about the metod mentioned above

thanks