VVT Angle and throttle % (OFT)

[nickw14]

So I just got my OFT today and have been experimenting with some maps. I have been testing out VVT cam angles at idle and I keep running into this really weird situation. I will try to explain the best I can, so bear with me

At idle (0% throttle and ~.20 engine load) I have changed the vvt cam angle (both intake and exhaust). However, when I flash the tune and the car enters closed loop, I see NOTHING happen. The only time my values are ever actually used is when I press the throttle ever so slightly (not even enough to bump the value up 1%, but the rpm's do go up by less than 100).

Is there some value that basically limits vvt at absolute 0% throttle? I have searched up and down all these values and can't find anything relating to that.

Thanks for any help you all may provide!

EDIT:
http://forums.nasioc.com/forums/show....php?t=2573995 This thread provides some insight. It appears as though one of two things could be happening here:

1) AVCS is not active because the oil pressure drops once the engine enters closed loop. Since the threshold is (apparently) a higher value than what the pressure is at idle, AVCS will not do anything unless the throttle is depressed even slightly.

2) AVCS is not active because of a neutral switch (I assume both park and neutral are considered the same thing).

[steve99]

Originally Posted by nickw14

So I just got my OFT today and have been experimenting with some maps. I have been testing out VVT cam angles at idle and I keep running into this really weird situation. I will try to explain the best I can, so bear with me

At idle (0% throttle and ~.20 engine load) I have changed the vvt cam angle (both intake and exhaust). However, when I flash the tune and the car enters closed loop, I see NOTHING happen. The only time my values are ever actually used is when I press the throttle ever so slightly (not even enough to bump the value up 1%, but the rpm's do go up by less than 100).

Is there some value that basically limits vvt at absolute 0% throttle? I have searched up and down all these values and can't find anything relating to that.

Thanks for any help you all may provide!

Are you letting car idle for at least a minute after re-flash as cams are locked intill ecu has done some kind of checks after reflash.

Oil or coolant temp might also have to be to some value before vvt active.

The tables you see in romraider or ecutek ect are only the "discovered" tables and their are possibly hundreds of undiscovered tables or parameters thet are still unknown.

your best hope would be @Td-d or @ztan

[nickw14]

Originally Posted by steve99

Are you letting car idle for at least a minute after re-flash as cams are locked intill ecu has done some kind of checks after reflash.

Oil or coolant temp might also have to be to some value before vvt active.

The tables you see in romraider or ecutek ect are only the "discovered" tables and their are possibly hundreds of undiscovered tables or parameters thet are still unknown.

your best hope would be @Td-d or @ztan

The engine runs for about a minute before entering what I assume is closed loop. Unless there is some value that must be reached for VVT to be active at idle, it appears to be active after the minute wait. When the throttle is pressed I can see the can angles change, but they return to normal (2.5* intake and 0* exhaust) when stopped and idling.

This could just be the fact that I have been playing with it for 6 hours (I love this thing), and taking a look at it tomorrow may provide a solution.

[Td-d]

The AVCS system take a couple a couple of minutes to reset after each flash- if you get on it immediately after flashing, you will see that AVCS is not active.

[nickw14]

Originally Posted by Td-d

The AVCS system take a couple a couple of minutes to reset after each flash- if you get on it immediately after flashing, you will see that AVCS is not active.

The issue is that it is not active at idle, when I'm not getting on it at all. Is the system just not meant to be active at idle with no throttle interaction?

[Td-d]

Not active at all in idle, or just for a couple of minutes after a reflash?

Can't say I've looked through the code in detail recently - but why would you want to change AVCS at idle in any case, there's no benefit to it?

Having a quick look at the code in and FXT rom - yes, the idle switch is checked (along with a whole host of other parameters) which may result in the AVCS tables being bypassed.

[nickw14]

It's more of a proof of concept or just getting to know the system. Anyway, I edited the original post with a link I found which is pretty much identical to this question. It looks like avcs is completely disabled at idle.

[Koa]

proof of what concept?