Vipec Idle Issue

[CeJay]

Okay I have a vipec plug-in ecu. Now when it was tuned it turns out that the aircon wasn't working. The compressor itself wasn't activating. Now I have since had that fixed, it was a problem with the climate control unit, and I have had an extra switch put in to activate it.

Now the problem is whenever the aircon is activated the car has a tendency to stall when stopping, it appears that the ecu doesn't increase the revs in time to prevent the stall. It normally doesn't do this when the aircon is off. I presume this is due to less load on the engine. What would be the best way to fix this? Increase the idle speed? As it also tends to idle a bit low when the aircon is on.

[TiTAN]

In the ECU software increase the values in this table a bit and it should increase the revs when the aircon is on.

Idle Speed Control > Idle-Up Tables > Aircon Step

You could also check the RPM lockout value (mine is set at 400, however i have never had aircon so dont know if this is high enough with it on)

Idle Speed Control > Idle Speed Control > RPM Lockout

[Trozzle]

oh lookies, another A/C problem with a ViPEC lol. There must be voodoo magic required to make it work correctly.

I just took TiTAN's approach and pulled my A/C solenoid out lol

[RRob]

Sounds like the switch you have wired in isn't telling the ECU that A/C request is active. It won't idle up if it's not told to.

[DVS JEZ]

^^^ yep, if the ecu doesnt recognise the aircon is on it wont know to idle up, or because the aircon wasnt working when tuned he hasnt setup the air con step idle control

[CeJay]

In the ECU software increase the values in this table a bit and it should increase the revs when the aircon is on.

Idle Speed Control > Idle-Up Tables > Aircon Step

You could also check the RPM lockout value (mine is set at 400, however i have never had aircon so dont know if this is high enough with it on)

Idle Speed Control > Idle Speed Control > RPM Lockout

RPM Lockout is at 800rpm

change my Aircon step from 5.1 to 8.1 across the the board. Will see if this makes a difference. It did seem to help the idle of the car when I had the car connected.

[PM-R33]

Ever since I got my AC working on the Vipec the idle wasn't perfect with it on, so I played around with it a bit and it was good enough (not perfect) so I left it like that.

However I was just thinking, is the AAC actually set up on the base map?! I don't remember ever seeing it on the Aux output?

EDIT: I just loaded up VTS and noticed it is in its own folder called Idle Speed Control. However what output is that actually using?

[paulr33]

someone should write a FAQ for the vipec

[PM-R33]

Lol I was thinking about that last time when I had all those air con dramas.

Your the ECU FAQ King, you know what to do

[85URK]

I have the same issue, really low idle when aircon is on with vipec plug in. mine is in need of a retune once i get new turbos etc so il get it fixed then, but i never had aircon regassed when ecu was installed either so now i know im not the only one with the problem lol

[PM-R33]

Righteo I found out why I couldn't find the Aux output for the AAC, it is under Injector Drive 7

I'll play around with it a bit tomorrow if I have time and post up some specs if I get it all sweet.

[DVS JEZ]

is that for a plug and play ecu Phil?

ive never seen it under inj 7, but ive only tuned wire in vi-pecs

[PM-R33]

Yeah that's for the plug and play V44.

[SECURITY]

for a list of all analog/digital outputs and inputs and what they control, get the gtst/gtr manual off the vipec website.

the help file is ACTUALLY helpful. its by far the most comprehensive guide ive read. any issue ive had with my vipec ive searched the help file and its explained it all there in great detail, and it gives you a good idea on how it works.

[PM-R33]

Yeah the help file is great, I use it all the time. Makes it so much easier.

I got it to idle with the aircon on without stalling now which is great, however it still hunts up and down from 800-900 a bit. Not really sure how to smooth that out. Will keep trying.

[SECURITY]

That could be an AAC valve issue rather than ecu relayed. Good thing is you can start a thread on the vipec forums and ray hall himself will give you a solution.

[TiTAN]

closed loop or open loop idle control? if its closed loop perhaps play with the deadband setting.

[PM-R33]

Ahh good thinking. Yeah it is closed loop and the deadband is set to 30rpm. I'll try setting it to 100rpm or something and see how that goes.

So many thing to adjust!! Haha.

[rob82]

Ahh good thinking. Yeah it is closed loop and the deadband is set to 30rpm. I'll try setting it to 100rpm or something and see how that goes.

So many thing to adjust!! Haha.

If you want it to idle properly you need proportional spark as well as closed loop idle control. The trick is to find the advance at which +/-10 degrees of timing gives you an equal increase/drop in rpm then apply your delta igntion numbers corresponding to the rpm you found and make your base idle timing the number you found earlier. Make sure you turn off all IAC control while doing this though.

Open up the bounds on the idle control to at least 100-150rpm you want it to do very little until +/-200 rpm from you desired idle speed..