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R34 GTT idle problem

Danowner
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Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
4 hours ago, silviaz said:

Apexi, though I'm not comfortable with setting the idle, knowing me I'll f**k it up lol.

Ohh even easier.

 

Go dial up 700rpm on the hand controller. Rip off the TPS plug, wait till the idle drops and then adjust the IACV screw so it's just a tad below the target on the hand controller (say 650rpm), plug the TPS back in and idle will climb back to target.

Done.

silviaz Proficient

silviaz

Posted
Posted (edited)
2 hours ago, Dose Pipe Sutututu said:

Ohh even easier.

 

Go dial up 700rpm on the hand controller. Rip off the TPS plug, wait till the idle drops and then adjust the IACV screw so it's just a tad below the target on the hand controller (say 650rpm), plug the TPS back in and idle will climb back to target.

Done.

That sounds pretty easy actually haha. But is there a reason why the tuner didn't do this? It's not like I've got a cammed 500kw rb25 neo. 

 

Also the tps plug is different on the rb25det neo and the r33 for example, I guess I'd plug out the loom which is this end? There's also 2 connectors. 

image.png

Edited by silviaz
Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
6 minutes ago, silviaz said:

Also the tps plug is different on the rb25det neo and the r33 for example, I guess I'd plug out the loom which is this end? There's also 2 connectors. 

Unplug both, it causes the idle closed loop condition to not be satisfied 

soviet_merlin Experienced

soviet_merlin

Posted
Posted
9 minutes ago, Dose Pipe Sutututu said:

A high case of cbf.

Car runs, idles fine, not touching it.

I mean, what's the concern here? Higher fuel consumption?

FWIW my idle sits at around 800rpm or so as well. And yes, it runs fine, idles fine and there are no issues as far as I can tell. I don't quite see the problem.

  • Like 1
silviaz Proficient

silviaz

Posted
Posted (edited)
26 minutes ago, soviet_merlin said:

I mean, what's the concern here? Higher fuel consumption?

FWIW my idle sits at around 800rpm or so as well. And yes, it runs fine, idles fine and there are no issues as far as I can tell. I don't quite see the problem.

I know it's probably not going to cause any major engine issues. I just had a more generic concern that it's technically not running right (I guess this means the rpm is not sitting where it technically should be) Though the other thing is, it's that my steering wheel is shaking at 1,100 rpm at idle until it gets warm (seemed to happen after I tightened my alternator belt, will be testing the alternator soon).

Edited by silviaz
joshuaho96 Veteran

joshuaho96

Posted
Posted
53 minutes ago, soviet_merlin said:

I mean, what's the concern here? Higher fuel consumption?

FWIW my idle sits at around 800rpm or so as well. And yes, it runs fine, idles fine and there are no issues as far as I can tell. I don't quite see the problem.

For me at least the reason why it bothers me is because it's indicative of a deeper problem. And that will nag at me forever. Especially because I have tailpipe emissions testing + evap leak testing every 2 years.

silviaz Proficient

silviaz

Posted
Posted
3 hours ago, GTSBoy said:

Yeah, when I dialled my idle down, given how much time I spent idling at the lights in traffic on my daily commute, the effect on overall fuel consumption was absolutely noticeable.

Interesting. My tuner said after the tune that my fuel economy would be better but it is the exact same from what I could tell even though my car was running rich before lol. How much do km do you reckon you get on a full tank of petrol on your commute?

GTSBoy Grand Master

GTSBoy

Posted
Posted
10 hours ago, silviaz said:

How much do km do you reckon you get on a full tank of petrol on your commute?

The nature of my commute has changed. Way back then it was traffic lights all the way, for ~28km. It sucked. When they finally stitched the expressway together I could do a good 15+km of it at a steady 80-100 with no stopping. That alone has gotten me down to flat 10s. Prior to that it was mid-high 10s.

I can't remember the delta that I saw when I got the idle down. It was only ~150 rpm, because the idle speed was never terrible, but for the delta in consumption to be noticeable it would have had to have been at least 0.2-0.3 L/100km - which is not to be sneezed at when it comes for absolute free.

It's only about 50L per year, but that's ~$100. A few extra pizzas is always welcome.

Note that I have a record of every tank of fuel that has ever gone through my car except for a handful put in by someone else, like my mechanic. I can show you the difference between stock RB20 and tuned RB20, stock RB5Neo and tuned, winter and summer fuel blends, winter and summer fuel blends when the ambient temperature is not appropriate for the blend, working O2 sensor, blown O2 sensor, boosting f**k out of it and frightened to boost it because it is pinging, and so on. OK, I probably can't do all that now with 100% clarity - but at the time when any of those things were in event, you could see it in the records. There's 25+ years of simple tank after tank records, so you have to look for landmarks to work out approximately how old any single record is. What's really important is the meta data and that lives in my head.

  • Like 1
silviaz Proficient

silviaz

Posted
Posted
17 hours ago, Dose Pipe Sutututu said:

A high case of cbf.

Car runs, idles fine, not touching it.

 

One other question, is there a chance that changing the idle speed can lead you down a rabbit hole and is the reason the tuner didn't touch it? Reason I ask is because if that's the reason the tuner avoided it then I probably shouldn't be touching it lol.

GTSBoy Grand Master

GTSBoy

Posted
Posted
1 hour ago, silviaz said:

One other question, is there a chance that changing the idle speed can lead you down a rabbit hole and is the reason the tuner didn't touch it? Reason I ask is because if that's the reason the tuner avoided it then I probably shouldn't be touching it lol.

Not really, no. Anything you would do is easily reversible.

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      One other question, is there a chance that changing the idle speed can lead you down a rabbit hole and is the reason the tuner didn't touch it? Reason I ask is because if that's the reason the tuner avoided it then I probably shouldn't be touching it lol.
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