I have a PLX wideband with a multigauge. I have a Rtek not sure the version I have,(does anyone know how to check?) The car is a S4 base with a JDM motor swap using the N/A harness. The car currently idles with a AFR of about 10.5 - 11:1. There is currently no input for the 02 to the ECU. I am not sure which wire to run the signal wire to. I was going to run the narrow band but if the rtek could use the wideband for closed loop running I may change my mind. I think the signal wire is suppost to go to a gray wire, 2D. I think. Any help would be great thanks.

 

the rtek doesnt use a wideband for close loop, it still needs the narrowband. Does the PLX have a narrowband output? if it does, you can wire it to the pin 2d on the ecu.

 

It does have a narrow output. I wanted to confirm that it is 2D for the O2 signal. The FSM confused me a little.

 

yes it is 2d, and as stated it won't use any O2 sensor for idle, or wot, only cruise.. you can adjust your idle afrs with the palm.

 

my car idled better when the OEM O2 sensor was working better, Now it is really really rich.

 

I have been slowly trying to tune my rtek to get the idle leaner. I have been able to get it to about 12.1 every so offen but it still will idle closer to 11.5. I have pulled fuel about 15% or so. I have noticed the AFR at about 2800-3000 curise seem leaner then before. they will hit about 15.6 or so. I am not sure if that is bad or not. I am not sure how the tuning points work either. like if I want to adjust at the 800 or 900 rpm range do I adjust the 512 or 1024 rpm? I didn't want to start a new thread.

 

^ sounds like you are well on your way to not doing your homework, and your engine will be blown soon.

 

The closer the rpm is to the rpm correction point is the one you use, so if u are idling at 900 use 1024. At anything close to the middle point its you will need to adjust both points to see which one will make it lean since the rpm will vary +/- 50rpm. Its the same thing with the map sensor readings. At idle lets say, 900 rpm, and the engine is pulling 13inhg. You need to decrease fuel at the 12inhg point and 1024 point.

At 15afr when cruising is a little lean for rotaries, it may stumble a bit. But it depends on ur engine health. Some do fine cruising at 15afr, some doesnt. Use the logging function of the rtek to help tune the car.

 

...Except you can't tune idle with the Rtek. You could take away 15% or add 20% and it won't make a lick of difference for idle. OP Please read more and tune less.

 

^ What's the reason for this?

 

Assuming s4, Have you gone through the idle setup procedure, it allows you to tune idle. RTM!

 

When will they Learn... READ THE MANUAL!!

 

Not a complaint, but this is by far my biggest request with the n370. Any plans in the future to support? If not, is this ECU's ability to tune idle actually restricted?

 

Following the "idle setting procedure" While certainly helpful and more convenient than following the stock idle procedure; isn't really ruining idle. It offers no more ability to "tune" than the stock ecu.

If idle could really be tuned you would be able to add or remove fuel to compensate for increased/decrease airflow (aka n390 afm swap) but alas, you cannot.

 

you can use the variable resistor setting to adjust idle fuel.

 

After reading the manual daily, until I get my car running, that's what I thought.

 

On a scale of 1-100 the variable resistor gives you about 7 pts of adjustability (not real numbers, just illustrating a point). Enough to smooth out slight imperfections but not enough to compensate for any substantial changes.

Understand that I am not talking about the stock AFM. The embedded idle adjustment feature and variable resistor slider is sufficient to produce a nice idle (provided you have no vaccum leaks) on a completely stock setup. However to call that limited correction cabability "tuning" is just a little generous.

To put it in perspective, there is nothing that you can do with the variable resistor that a properly functioning BAC cannot compensate for, so how much "tuning" is really going on?

 

Tried it to no effect. But setting the tps did help a little, getting the twin scroll door to close made a huge difference.

 

On n370? Couldn't find it.