Nistune Forums

Hi It is my understanding that at idle the O2 sensor is NOT USED. From my observation it seems that closed loop is only ON when the car is in gear. Many engines don't idle well at Lambda 1. As said I have a similar issue and am about to investigate. I have missed ignition events at 2000 to 3000 Uns...

I am finding the O2 is learning my settings to make idle richer and then its causing other problems like if I idle for more than 1 minute it randomly goes down to 300rpm idle and pops lots then comes good again so my fix is not a fix at all and I had to revert to a linear TPMIN array. I really want ...

Of course your will have excess o2 in the cylinder... My bad

https://dl.dropboxusercontent.com/u/1428435/test_2013-12-29_1537_30.xlsx The red section is idling with 8s in the TPMIN scale where it pops badly The non red section is idling with 10s in the TPMIN scale at idle where it idles pretty good The 2nd red section is after I give it a big rev (pops like h...

Rest of the tune is fine, idle however randomly gets as lean as 17:1, I don't currently have a wideband but this is what I have seen it get to. I was just adjusting the latency to see how it affected the idle I was never going to use that as a solution, it was however still lean with that huge incre...

Changed the TTPMIN map from 8 to 11 around idle rpms, changed my injector ms up to 2.25-2.3 which reduced the popping a lot, think this might be an easy solution, can't stop it popping in neutral even if I increase the ms massively, I'm guessing these injectors just have a shitty spray pattern (740c...

Is it possible to turn O2 feedback off at idle? I read in this thread that if you have 14.7 in any cell (eg 0 like where the car idles) it can't be turned off. I have a problem where my idle just keeps getting lean no matter what I do, my injector latency is at 1100us, if I change it to 1250-1300 my...

Zero'd the tables out, now when I start the car no matter the temp it drives like it is warm, much much nicer. Imo I would nuke these maps on all tunes unless you specifically need the cat warmed up to pass a test.

Matt wrote:I would think at 0 it would take no effect. I can try it out on the bench if you wish...

Only if you have time, I'll try it myself tomorrow anyway see what happens.

Thanks for all the info!

There's basically only one way to set it correctly and that's on a dyno/rolling-road. You do one run with VTC turned off and one run with VTC switched on (permanently) Then overlay the two readouts and the point were both graphs cross will be your ideal VTC switching point. There is one argument to...

See my car sits around 81 degrees when cruising most days, so it makes a bit of sense why it might be causing issues now. When completely hot it drives nice, when cold it drives nice, randomly in the middle it feels down on timing. If you zero out the timing vs temp map it would affect the timing up...

I see so when warmup timing is not used eg starting at > warmup_timing_max_temp, the timing = a) = (A-B)? b) = main timing table + (A-B) c) = main timing table - (A-B) How long are these two tables used for before the main ignition timing map is used on its own? Or are the warm timing start tables u...

That makes a lot of sense, can anyone comment on how all 3 tables interact together.. cumulative or 1 of 3 are selected based on x condition?

Just wondering if any new members have any thoughts on this?

Cheers

I understand how the warmup timing table works where it kicks in at the min temp and then exists at the max temp, it then uses the timing in the 2D table when in side of these bounds. On a standard RB20det (r32) ecu the timing values seem very retarded around 10 degrees, also oddly only kicks in at ...