Vlad's rides thread

[Dylan]

Looking at those 2 logs that second one has restarted quite lean. The charge temp is similar but was calculated different. The MAT had risen and the coolant had lowered. I made a couple mods worth a look anyway.

I've often changed the coolant percentage in the idle areas for cars with big cams. When a motor idles at 85kpa the coolant contribution from factory is low so I bump up the idle area to help with consistency.

[VL400]

2nd log is 10 min off time and restart. Its stupidly lean. I dont get why its so lean. I played with the coolant contribution table going one extreme values both way to see what change it has, pretty much unnoticeable changes.

From another thread regarding AFR offset, timeout and inverse temp tables...

With the stock tables it prevents a lean hot restart when combined with the bodged charge temp inverse temp table, so watch out for that if you do stray from the standard tables.

In regards to your other issue on the AFR its likely what holden202t mentioned, the timeout before using idle AFR. It will still be in closed loop idle speed control, just uses the main AFR table for a bit before going to the idle AFR table.

[vlad01]

2nd log is 10 min off time and restart. Its stupidly lean. I dont get why its so lean. I played with the coolant contribution table going one extreme values both way to see what change it has, pretty much unnoticeable changes.

From another thread regarding AFR offset, timeout and inverse temp tables...

With the stock tables it prevents a lean hot restart when combined with the bodged charge temp inverse temp table, so watch out for that if you do stray from the standard tables.

In regards to your other issue on the AFR its likely what holden202t mentioned, the timeout before using idle AFR. It will still be in closed loop idle speed control, just uses the main AFR table for a bit before going to the idle AFR table.

I remember reading that botched charge temp but its up there around above 104? and up, so that shouldn't concern this as the max I have seen is 89 for the charge temp so far.

As for this time out, is it adjustable and whats it called? Would be nice to stop it as it makes the engine stumblely at idle.

[Dylan]

I think the fix for that was to copy the APNX values or the V8 ones.

Look at initial run afr offset and also the initial run decay time table's.

[vlad01]

I think the fix for that was to copy the APNX values or the V8 ones.

Look at initial run afr offset and also the initial run decay time table's.

I've already done that ages ago.

But still doesn't make sense why it ignores the offsets/timeouts and then resumes back to them after 20 sec.

[Dylan]

It doesn't resume to them they richer the targeg they are the steps in the target afr you see at the start of the log.
From what VL400 said which I didn't no is when in closed loop idle it doesn't go straight to idle target afr.
It's in speed control first from what he said then a further delay for that. If I read it correctly.

Is this afr rise only at around that temp 40 odd degree?
Maybe raise the lowest 16afr cell up an rpm to see what happens?

[vlad01]

It doesn't resume to them they richer the targeg they are the steps in the target afr you see at the start of the log.
From what VL400 said which I didn't no is when in closed loop idle it doesn't go straight to idle target afr.
It's in speed control first from what he said then a further delay for that. If I read it correctly.

Is this afr rise only at around that temp 40 odd degree?
Maybe raise the lowest 16afr cell up an rpm to see what happens?

its at 44 C exactly. Its not the 16 afr cell, problem is is the 14.7 which is too lean for a cold engine, causing it to rumble. You can see it doesn't like it as the vacuum decreased from being too lean.

[Dylan]

But you thought it was the interpolation causing it? If it's not in idle afr mode it's possible.
As VL400 if the closed loop idle is set it's not necessarily running idle afr's.

Change the 20 100kpa table to stock to see what happens can count that out if nothing else.
Is the cold afr table stock?

[VL400]

I remember reading that botched charge temp but its up there around above 104? and up, so that shouldn't concern this as the max I have seen is 89 for the charge temp so far.

As for this time out, is it adjustable and whats it called? Would be nice to stop it as it makes the engine stumblely at idle.

Missed the link sorry .. http://pcmhacking.net/forums/viewtopic.php?f=27&t=4317

It discusses cold start AFR, but the same tables are in use for the what I think is a hot restart bodge on the V6.

[Dylan]

So you think maybe that problem was there on the VN's? And the VR charge temp table was an improvment?
-43 is a massive jump and I'd guess it would almost turn it to rich.

In the series one VN intake is the MAT sensor in the same spot as the later intake?