Vlad's rides thread

[vlad01]

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?

yes the MAT is in the same spot.

And yep, I recall originally the VP went pig rich on very hot starts with default BLCD.

[Dylan]

Just work at lowering the 90 + temps see how far they need to go.
Wonder why it does it since your VR doesn't do it.

So the VR has the earlier charge temp table.

Is the APNX and BLCD coolant contribution table the same?

[vlad01]

Just work at lowering the 90 + temps see how far they need to go.
Wonder why it does it since your VR doesn't do it.

Is the APNX and BLCD coolant contribution table the same?

The VR seems to run cooler and also CAI might be heaping.

Other factors like better condition engine help with stability I have found.

VR performs consistent in all temps, VP performs much better when its cold, losing power as it heaps up. That tells me the cylinder sealing is reduced when at operating temp. compression lock up is about 5 fold stronger when cold. The VR is the same either way, strong.

When I was setting up the inverse table today I did a trick to make it easier, but it didn't work from what I see as a worn engine.

I set the idle speed offset all the same so the engine idled at 850 from cold to hot in attempt to hold the same VE cell. The VE changed a lot during that warm up.

[Dylan]

Coolant contribution is the same between APNX and BLCD.

[vlad01]

yeah it is, i even looked at the hsv tunes. also the same, in fact both tables are the same as in APNX

[vlad01]

I wonder how it actually leans out? Can it be that the engine cools off overall but the sensors heat up?

If that is the case, then that would be an uncorrectable issue? only be able to somewhat botch it. What would be useful is another offset term based on hot start temps and time out. A correction factor not an actual offset as we already have such a table.

[Dylan]

From memory the MAT climbed 10 degrees I guess that affects it.

[immortality]

Cold start or hot start does the engine not start in open loop mode which is primarily based of the CTS and ignores fairly much all the other sensors?

[Holden202T]

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.

ok so max coolant temp for cold engine table is the one to dictate when it switches from the cold afr tables to the main afr tables .... you could maybe even increase this if its needing to be richer for longer.

the delay tables there are the ones you want to change times to make that 20 seconds smaller .....

tables.jpg (57.59 KiB) Viewed 3516 times

you'd notice it if you have the motor up to temp even, you are driving along and come to a stop, 18 seconds after you stop the target AFR will jump from main to idle table figures.

like I said I normally change this to 5 seconds for most worked motors I've tuned, I have found if its at 14.7 for too long at idle it can start to hunt, but I've never had an issue with 5 seconds ....

its probably another emissions or save fuel type of setting .... but also stock motors will run a lot leaner at idle happily ....

for reference the above tables are from $12P BLCD.

[Dylan]

I just re read VL400 post. Thats the delay I was talking about for idle fuel afr.
But as said I always have that delay very short as well. Must line up with the closed loop idle flag. As I always took that as speed control and idle afr table. Obviously 2 different delays happening.

Set them to 2 seconds and should be good. Closed throttle then u der 5kmh then wait 2 seconds and you're in idle mode.