nvmyre

ok well i was wondering if anyone can help me im changing my injectors in my fd it has a power fc
i have calculated the correction for each injector but i dont know how to get the latency time or dead time for each injector

my primary are siemens 910cc
my secondry are bosch white 1600cc
any help would be greatly appreciated

also does anyone know how to work out the correction time for my new map sensor if it does need a correction
its a delphi 3 bar map sensor

cewrx7r1

iTrader: (2)

(1)my primary are siemens 910cc?
A: The PFC will not allow you to achieve a lean idle by adjusting only fuel with such large injectors. You will end up using "LAG" at 0 or a negative value to achieve it.
Thus your LAG will be what ever it takes to get a good idle.

(2) my secondry are bosch white 1600cc.
A: 30 LAG.

(3)also does anyone know how to work out the correction time for my new map sensor if it does need a correction its a delphi 3 bar map sensor?
A: What is "correction time" for a map sensor? If you mean scale and offset, read the thread about calibrating it. The tread is only about 1-2 weeks old.
If your engine was already AFR tuned, then you will have to first determine the true ABS values for your P rows, such that you can setup the new map sensor correctly on Setting 3 MAP REF BOOST ABS.

If not, then follow the calibration instructions, calibrate the new map sensor, and put all the new data into the PFC.

SPICcnmGT

Can you not use the recalc with the datalogit, to adjust the idle fuel output lower??

cewrx7r1

iTrader: (2)

You can recalc all you want, but the PFC has a built in minimum injector on time for idle. That is why many 850 primary injector users have to use very low or negative lag to lean out the idle. This can be experinecd by using the PIM RPM or IGL/IGT-INJ temp map.

SPICcnmGT

Ahh ok, thats good to know.

Does the lag not effect the whole map though?? If so I guess you just have to add more fuel to the map to make up for it correct??

cewrx7r1

iTrader: (2)

That is correct, it leans out the whole map.

If you run 850/1600, the primaries at full boost supple 34.7% of the fuel.
If the lag affectively reduces the 850s by 5%, then the total leanest will be
1.74%.


Always tune idle first!

SPICcnmGT

Ok thanks alot. That means if I run 4x850s in the same situation then I would decrease the whole map by 2.5%.

Is their a way to tell how much the lag effects the map or am I going to just have to add some fuel say 5% or so and then back the map off from there, by comparing the AFR's from the stock setup to the new one?? I guess the safest way would to tune idle then compare bfore/after AFR's under cruise, add maybe a little more and tune full throttle and cruise from there??