parameters to change injector size

[berry]

Hi guys

Which parameters (names) do I need to change, when I've replaced the fuel injectors with lager ones?
I know low and high slope, fuel breakpoint and Injector Offset.
But what are the exact names in the XDF-file (A1)? I have troubles to find them.

Thanks for your help.


My Car: 1992 Beretta 3.1 MPFI, auto

[berry]

Is there anybody out there?

[young gun]

Is there anybody out there?

I'm sure someone will chime in soonish. Just a tad bit slower around here these days.

[young gun]

SappySE107

[SappySE107]

BPC vs EGR is the main one for fuel constant.

[berry]

Thanks Sappy. But I can't find BPC vs EGR in the strategy A1. Maybe the name altered?

[berry]

ah you mean the table Base Pulse Constant vs Desired EGR (F28 ) ?

[berry]

Why EGR? EGR sounds in this combination very confusing. Does it play a role if I already deleted the EGR?

[SappySE107]

its a base pulse constant vs EGR%. If you delete the EGR, then use the 0% (top) number only. Im not sure what the table label is.

[berry]

It sounds logical. I will do.

[berry]

I've found it! See picture below.
Sappy, you've said that BPC vs EGR is the MAIN one for fuel constant. Does this imply other secondary parameters I need to change?

[SappySE107]

SImply put, thats it. If you want to tweak something else, offset vs battery voltage would be the next one that comes to mind.

[berry]

thanks!

[berry]

btw Sappy,
CONSTANT = 1461.5 * (EGR FACTOR)(LITERS/CYL)/(INJECTOR RATE)
did you make the math to work meanwhile?

you wrote at:
10-17-2011, 08:09 PM

1461.5 * (.988 )(.516)/(2.09) = 0.152

That makes more sense other than I still can't make it work as a math formula either.

source:

https://www.60degreev6.com/vb5/forum/non-engine-specific/computer-related/obd1-tuning/25018-setting-the-injector-constant

so, when I take for the EGR Factor 0.000424 it seems to work:

CONSTANT = 1461.5 * 0.000424 * 0.516/2.09=0.153

is that right?

[SappySE107]

It worked for me once and that was it. What size injectors and its a 3.1?