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Idle problem with Power FC

Robo's

By Robo's,
in Engines & Forced Induction

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Robo's Mentor

Robo's

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When im doing 60 and i put it in neutral and coast down to a stop, the idle hunts quickly between 1000 and 1200rpm, then its stable when i reach 20 kmh, then idles fine when i stop. When tuning the power fc on the dyno last night, it was sometimes hunting up and down at idle with the car stationary. Took the idle control valve plug off and its perfect. Put it back on and its temperamental.

Can i control the Idle Control Valve with the Power Fc handcontroller?

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https://www.sau.com.au/forums/topic/65063-idle-problem-with-power-fc/
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Targa Tom Proficient

Targa Tom

Posted
Posted

Meke sure your ignition and fuel load points at idle are the same, different settings in adjacent cells will cause hunting...

But putting it into angel gear at 60ks??? Whats the point?

TT

Robo's Mentor

Robo's

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Robo I just wanted to ask what hp did you get when you ran 12.98?

I got fc, zorst, filter, boost up and fmic and i only got like 102.2 mph

We got upto 207rwkw when i ran the 12.98 and that was with a SAFC 2 and no power Fc. The lowest mph with the FMIC and the rest was 105mph. I drove it hard though.

Now with the 2530 its absolutely hauls ass. Big difference in power.

Robo's Mentor

Robo's

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  • Author
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Presently im mucking around with the TPS settings. When stock it was reading .43 on the power fc. If i go higher, the idle increases. It seems to be getting worse, the idle speed on the power fc has no influence on the revs. I think i need to do some more testing.

Cubes Grand Master

Cubes

Posted
Posted

I've recently fitted a PowerFC to my RB30DET.

My TPS setting flicks between 0.46-0.47v.

Full throttle shows 4.01v.

With the TPS set any higher I tend to get the occasional popping when decelerating due to the fuel cut not being enabled. The ecu thinks i'm still on the throttle.

~0.46 appears to be where its at as when I take my foot off the fuel cut always kicks in, no slight flat spots on the tip of the accelerator, especially when cold.

Prior to fitting the PFC I set idle to 650rpm via the idle air control valve with the plug disconnected.

The motor is fairly fresh and prior to dropping it in the car I did make sure I gave the Idle air control valve a really really good clean.

I had previously cleaned it around 40,000km's prior. It was already very dirty again. :(

At 650rpm the car does have a slight little pop every so often.

I set the idle to 700rpm with a/c off and 750rpm with a/c on.

Fuel cut a/c on return is 1050 and fuel cut a/c off is 1050.

The high fuel cut idle settings makes idling around car parks just that little bit nicer.

It idles perfectly smooth and you can actually see the idle drop fast from higher rev's then hang around 1050rpm for a sec then slowly drop to its set 700rpm.

I did have a similiar issue with the car stalling or almost wanting to stall when throwing it in neutral. I fixed it by following the manual and doing the 30min idle learn.

To get it right I had to initialise the PFC though. :D

Not so good if you have had a tune.

It wouldn't be too much of a drama if you write down the ign & fuel maps.

I did also have a little issue with warm starts where the car would spin over and over and not start. I fixed it by pumping 5ms in to the Cranking injector settings across the board. Starting is now instant.

Bl4cK32 Grand Master

Bl4cK32

Posted
Posted

ok i found a mammoth thread on this, but i havent read it all of as yet, but it may help you solve your problem :

http://forums.skylinesdownunder.co.nz/show...25&pagenumber=1

its already helped me understand how to go about checking a few things to get the idle under control....

ps..Joel -two days in and you're about ready to open a tuning shop :(

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