Apexi Power FC, Bosch 026IMP850 Latency time needed

[OutToWinPAHC]

I need help programming my new injectors which are 850cc with a .75ms lag time. This is for a S2 RB25 BTW

Basically I need to know where to make my adjustments. I am using this photo for reference. Where it says 1.00 that is 100% of 370cc? So that should be set to .435 (370/850=.435xxxxxe) ?

Also right to the right of that in the injectors box what is the "0.00" used for?

And the latency time is .75ms at 14V for the new injectors. How do I program the other voltages, I cannot find them?

Also my copy of datalogit round the injectors up for down so .435 will end up as .40. Is this normal or is my copy old? V2.127 for the Fc edit program.



Thanks

[OutToWinPAHC]

Also does anyone have a copy of FC edit newer than mine. I believe I am a release behind

[OutToWinPAHC]

Also does anyone have a copy of FC edit newer than mine. I believe I am a release behind

[OutToWinPAHC]

From what I am reading the Siemens/Deka scaling is bout on par for Bosch. The latency on the Siemens 875's are .73ms at 14V. And realistically the vehicle will operate 13.5-14.5V So if I calculate the % for the other values I should be on par.

[Darius]

Yes you are of the correct train of thought in modifying the injector table. However, don't forget to multiply by 100 to enter "43.5" where it currently says 100.0. Otherwise, the engine won't start.

And I find the best way to set the injector latency (the boxes that currently say "0.00" next to the boxes with the "100.0" in them) is to keep increasing the value by 0.02 until the PFC is having trouble keeping the AFR at 14.7 at idle. Then back it off to the previous value. That should be good enough for government.

The lag vs. voltage settings vary by injector also but it appears you have found the new value to be 0.75 @ 14V. That is all you need. I'm not sure why the table goes below 12V because there is no way the engine is going to run off of that low of voltage anyway. In summary, enter "0.75" where it currently says "0.668".

[240z4u]

When I got my bosch injectors I sent one off to get a proper latency test done and flow testing done as well, it was fairly inexpensive and reassured me that everything was dialed in correctly. Your adjustment thoughts are correct as Darius noted above.

[Darius]

Deatschwerks sends a sheet with the latency for their injectors but I couldn't get the car to idle for crap with those settings. When my tuner changed the latency back to "0" and the car idled like normal again. It should be fairly simple to tinker with the values a little bit and dial it in.

[240z4u]

Deatschwerks sends a sheet with the latency for their injectors but I couldn't get the car to idle for crap with those settings. When my tuner changed the latency back to "0" and the car idled like normal again. It should be fairly simple to tinker with the values a little bit and dial it in.

That's odd. That certainly wasn't my experience when I had them. I think I spent 25 bucks having my latency tested and flow test done.

[OutToWinPAHC]

I have a flow test... no latency results though

[OutToWinPAHC]

Well that latency info is good, but lost spark on one coil I an going to check my signal, 12+ and ground next. I think I may have a bad solder joint in my RB/LS coil harness

[Darius]

If you have a bum LS coil, I have a couple spare LS2's if you need it.

[OutToWinPAHC]

I'm good I got 16 LQ coils, 8 LS6 coils around the house... The coils aren't bad something else is, I need to check further tomorrow. I think it's a cold solder joint.

[jetdriver]

I'm not sure why the table goes below 12V because there is no way the engine is going to run off of that low of voltage anyway. In summary, enter "0.75" where it currently says "0.668".

You should have around 12-13v with a good battery. When you start the engine, typical system voltage with the starter engaged is initially 9v increasing as the engine winds up and the starter load is reduced. This is the only reason I can think those values are there.

I have never had any latency values on my DW injectors. When I called on the phone they say to use stock setting because they are stock injectors. This seems like bs to me because they are ported to flow more and should be under a higher load than stock, changing the response time. I have not tinkered with this adjustment as I have not found a good trial and error process yet.