mike13

iTrader: (27)

transient impact factor gain what does adjusting that table do? Does that affect tps 0%-3% tip in? My car after installing 60lb injectors has a lean hesitation with super light throttle with no load.

jimmyblue

iTrader: (11)

That is for the way fuel hits the wall, puddles or boils
off depending on air changes and so on. It will affect
transient fueling.

But I believe your problem is in the injector offset
area, since it comes in after an injector swap. If you
are lean on transients, then increasing the offset
value will increase the pulse width and fuel shot in
the end.

I guess that new tuning DVD has some stuff on this
but the price is pretty steep and I don't know if your
particular injectors are covered. You could just play,
scale the whole offset vs volts vs kPa table by 1.1
(+10%) at a time, and watch for your O2s to rise
instead of drop at tip-in; then call it done.

mike13

iTrader: (27)

Set up my injectors using the data from the dvd, it's only in the one area. I should clarify with my 42lb injectors I would see the afr go lean but not to the point of causing a hesitation.

Frost

iTrader: (45)

I would favor the short pulse adder from your description. Look at the injector open time at the time of the lean event. In your fuel section, it will be easy to match that the injector time with the adder amount.

mike13

iTrader: (27)

That adds time to the injector open time?

Frost

iTrader: (45)

That's it!

mike13

iTrader: (27)

So what does short pulse mean, adds time for a small period? I'm trying to understand how this table fits into the whole fuel/air equation.

Frost

iTrader: (45)

The short pulse tables are to correct the injectors' response in their non-linear territory (flow does not match what is described in the IFR). Whenever you see IPW fall below what you set for short-pulse limit, the adder is active. If you have the correct values in your short pulse tables, it is unusual to have to fiddle with it, but that's how you do it never the less.