A few questions

[ihiryu]

Hello guys, I'm new here.

I have a 1990 Skyline GTST, have my DET3 wired up in Piggyback mode. I had a few questions about the analog inputs.

A1 Goes to MAF
A2 is Internal MAP Sensor
A3 is Wideband
A4 is IAT.

This is how I plan to wire it. The install shows A1 is MAF, but when I looked into the software, it shows
A1 0-5v signal
A2 0-5v Percentage (So I assume this is TPS?)
A3 In AFR readings
A4 is my MAP sensor


When I rev the car up, it shows nothing on A3/A4 (no wideband hooked up yet), but A2 shows a voltage. Can I just load up new scales for A2 as the on board MAP sensor?
Since A4 doesn't show any readings (even though it's configured for the Motorola MAP sensor). As far as the MAP sensor goes, I see a few options, but I'm assuming it will be DET3_with_400KPA calibration?

[kamikaz33]

hello there, if your DET3 has the map sensor built in it must allways be configured in Analog IN #2 either 250kPa or 400kPa, you just have to choose wich one from the correct config files, but allways on Analog in #2.

Im also doing a Nissan but a SR20DE+t
and i have it wired like this:
A1 - from MAF
A2 - Internal MAP 250kPa (nothing wired on this pin)
A3 - Coolant temperature sensor (might use IAT instead)
A4 - Wideband (innovate)

scales config like this:



Good luck!

[ihiryu]

Very nice,

Are you going to delete the MAF?

I wish there was a way for us to see real time timing. Because I'm unsure if advancing the timing is taking any effect. Idle feels a bit better, but I'm not 100% sure.

[kamikaz33]

i had it in fuel implant mode with maf deleted before, but i just made the wiring in a way that i can switch to piggyback mode, fuel implant or stock just switching a couple of plugs.

Using piggy back mode again, reading map as load and changing maf signal to control injectors.

As for timing i bough a nissan Consult Cable to be able to check realtime timing.

and wired a jack into knock cable wired to pc or even car stereo to be able to ear knock, and helps a lot to adjust timing. might give more details later, on a bit of hurry now!

[ihiryu]

Speaking of load (forgive me, I'm very, very new with the DET3), if it would be possible to get an explanation of the setup tables?

So if you look at the picture (this is just default, not how it's currently setup)
For the fuel table

Modify Analog 1
Load Analog 2
Correction #1 Analog 3
Correction #2 Analog 4

Does that mean that it reads analog 2, and modifies the signal of analog 1? Then it makes corrections based off of Analog 3 and 4??

[ihiryu]

Okay so I'm reading the manual again (which is pretty confusing)

So Analog 3 and 4 are corrections for the main fuel map which is read based on what you have is for load (analog 2), which then in turns modifies the signal for whatever you have set for analog 1.

So Analog 2 reads a voltage based off of the map sensor, it takes into corrections for Analog 3 and 4, then modifies Analog one to make the stock computer run what the DET3 wants it to run.

So I'm looking at the fuel MAP, and I see Analog 3 is wideband, and on the corrections table, it reads 100 on the entire scale.

So pretty much whatever I make in the fuel map, it's multiplied by the corrections table.

[kamikaz33]

true, you set the fuel map according to your AFR readings in the 1st horizontal 2d map (Analog #3) which is your Wideband, and leave it all at 100 which means no correction to the map. If the value on those 2d correction maps its greater then 100 it adds to the fuel map final value if its less then 100 it substracts from the fuel map value, thats basically how the correction maps work.
Wideband is there so you can see how your afr is going but i beleive it should not be used for correction (Yes i tried it before and the car goes dumb entering like a loop with afr's going up and down).
As for Analog #4 2d map there you can add some correction in case of IAT to make it a little leaner if too hot or richer if its too cold. (CLT the car ECU can handle in piggyback mode).

[ihiryu]

Okay,

So what I think you are experiencing is the DET and the stock ECU are fighting with one another. Did you tune with the factory o2 disconnected?

[kamikaz33]

yes the factory Narrowband sensor is disconnected, anyway it would only have influence while youre idling or cruising(closed loop).
like i said, i had it in Fuel implant mode before and just switched back to piggyback mode, and since my project is nothing hardcore, its much easyer and stays nicer in piggyback mode, like in 1 hour everything was nicely tunned.