Tuning for E10

[joecar]

Yes, I need to get me an RR some time... (I already spent my budget on car parts).

[5.7ute]

Mick, in that log commanded AFR went lean & IBPW went up although
IBPW only went up a little.

WBO2 was not present, it would have been interesting to see if that changed as well.
ECT was low & high commanded EQ what happens in closed loop?

The RR sure does come in handy for experiment like these.

mr.prick. the IBPW went up when I changed B3601 to 18:1 for a reason. First map increased from the change in actual fuelling, which caused the commanded EQ rise. Hence a higher pw. Later in the log (frame 350) when I went the other way shows things much clearer.
Wideband AFR would have to change, since a longer pulsewidth is more fuel.
Closed loop would have trimmed everything back to stoich if in range of the trims, but this would obviously throw PE etc out. I guess all I am trying to say is set B3601 to the stoich ratio of the fuel you are using before doing AutoVE. Otherwise the airmass estimation will be incorrect.

[WHYTRYZ06]

ok guys here is what i did....

1. set b3601 to 14.12afr
2. use joecars custom e10 pid
3. programmed my lc1 to factory 14.7 afr and set analog 1 to 10 & 20 and analog 2 to 10 and 20...

result = didnt work.... afr on my wb did not match what the scantool showed...

so then i did....

1. b3601 to 14.63
2. use custom pid {EXT.AD1} * 2 + 10
3. kept the factory lc1 program @ 14.7 and analog 1 set to 10 & 20 and analog 2 to 10 & 20

result = it worked!!!! my wb now matches what the scantool shows ( within a decimal point, which is acceptable )

what i was thinking is justr adjust b3647 for which ever fuel im useing so if wot on gas is 12.5 afr and im useing e10 id set it to 12.0 afr...

thoughts?

[mr.prick]

You're right Mick.
Look at this short log in closed loop.
It takes a few seconds for actual EQ to follow but it does lean out,
I over did it a little.

[5.7ute]

You're right Mick.
Look at this short log in closed loop.
It takes a few seconds for actual EQ to follow but it does lean out,
I over did it a little.

I went to 18:1 AFR so you didnt overdo it too much.
It really highlights the importance of setting B3601 to the fuel being used. Otherwise you will run intp problems, especially during enrichment.
WHYTRYZ06. The proper way is to set B3601 to 14.12. Set your commanded fuel tables in EQ. Then just change B3601 when you are changing fuels. That way all the calculations are done internally by the pcm. (And you only have 1 table to change)
So
1. set b3601 to 14.12afr
2. use joecars custom e10 pid
3. program your lc1 to 14.12 afr.

[WHYTRYZ06]

I went to 18:1 AFR so you didnt overdo it too much.
It really highlights the importance of setting B3601 to the fuel being used. Otherwise you will run intp problems, especially during enrichment.
WHYTRYZ06. The proper way is to set B3601 to 14.12. Set your commanded fuel tables in EQ. Then just change B3601 when you are changing fuels. That way all the calculations are done internally by the pcm. (And you only have 1 table to change)
So
1. set b3601 to 14.12afr
2. use joecars custom e10 pid
3. program your lc1 to 14.12 afr.

i could do that, but joe said to keep my lc1 programmed at 14.7... so reprogram it to 14.2, i can try it and report back tomm

[joecar]

Andy, try programming the LC-1 to 14.12 and see what happens.

[WHYTRYZ06]

Andy, try programming the LC-1 to 14.12 and see what happens.

u got it joe and ill send u my calc pid file tomm as well

[joecar]

In the LC-1 User Manual, it says (in the chapter on programming using LM Programmer software):

"On this page you can see the software version of the LC-1 and you can change the multiplier to
calculate AFR from Lambda. A number of different multipliers are already pre-selectable but you
can change it to a custom one for the particular fuel you are using."


So I was under the impression that the AFR you entered here was for the display of the AFR in the LM Programmer software...


For example:

if the LC-1 is programmed for (stoich being 14.7): AFR = 2*v + 10
then lambda = AFR/14.7 = (2/14.7)*v + (10/14.7) = 0.1361*v + 0.6803

Then to get AFR for another fuel, lambda is multiplied by the stoich AFR for that fuel...

So did I mis-interpret the purpose of the AFR you program into the LC-1 via LM Programmer...?

[joecar]

u got it joe and ill send u my calc pid file tomm as well

Ok.