Hello everyone.

Its been about a year since have touched my rx7. Financial issues made me drop my insurance, and right after having a coolant issue when I finally started to add boost.

So Im back into the car again now, and trying to pick up where I left off. Not that easy... I forgot where I left off, so Im basically starting over. My plan was to continue using the firmware I had before, untill I get a good grip on where Im at again, and then Id like to try the 3.0.3. I drained all the bad gas, gave it a few gallons of fresh 93 octane, changed the oil and coolant, and I got her running again. Really rough, to start, but re-tuned my ve map so she would idle. Put my advance locked on 5* for now. 5* is where it seems to be smoothest at regaurless that before my idle advance on the map was around 13*. Kinda weird, but whatever.

My idle is still really rough but its holding, my motor is jumping around like its gotta take a dump. Read the thread abit about smoothing maps and stuff, and got things doing pretty good.

Most recently I was looking at a datalog of an idle situation, and randomly my PW are spiking. Im gonna post it up. I know the age old answer is grounding and noise. But if someone could look at what I have right now and advise me a bit. Like I said, its been a while.
Thanks

 

well I think I have decided to completely re-do my ms harness. I dont trust the factory one, and I dont trust my grounds anymore. If I run all the ms grounds to the engine, there should not be any problems. Im a little concerned about using the same grounding point for the wideband sensor. Where should I ground that? Obviously not to the ms ground on the engine...

 

Ok. Here is what Im gonna do...

I have a DIY autotune harness. I am going to keep my Microphone cables for CAS 24-2 wheel setup.

The only thing I see that needs to be done, is to remove the ground wire going to pin7 in the db37 and move the mic cable negative VR to this, remove pin24 wire and connect my positive VR mic cable. Then remove pin36 wire and connect VR2 negative from mic cable, and remove IAC2B from pin31 for VR2 positive. That should work as far as I see, because none of those were used anyway.

What I really want to know, is can I use pin2 to ground the shielding to?
Thats what the harness has now. But I really cant remember what I had my CAS wires shield grounded to before. Probably just a pin ground above pin7.

 

I also wonder about the harness not having any wires to pins 10 or 11 on the diy harness. Since these are used for grounds, is that going to be an issue if I dont use them for grounds with 8, 9, and 17, 18, 19 ? I guess, will the remaining grounds be enough?

help...

 

Randomly spiking PW is usually because your AE thresholds are set too low.

Ken

 

Like the AE rpm scaling...? I have that set to 2000rpm(low) and 5000rpm(high)

And acceleration wizard is set to MAP with zeros in everything, so it doesnt affect my tuning yet.

Thats the only AE thresholds I know of.
and I dont even know what the first one does. I just set it up when I first started.

 

The one I'm talking about is called MAPdot threshold. IF you set that to 0, you'll get all kinds of nasty PW spikes.

Also, your MAP signal is very jumpy anyway. Make sure you have vacuum coming from both rotors' runners or from the surge tank. Worst case you may want to update the firmware to get the latest MAP sampling code which will also help smooth things out.

Finally, your AFR is all over the place. Once you get the MAP jitter and PW spikes sorted out, everything else will likely smooth out, and then you'll have to tune the fuel a little richer to make it run well.

Ken

 

I cant remember if I had ever put some kind of restrictor on the map line on not. I remember I meant to but dont know if I ever got around to it. I need to check that too. I have a feeling i have all of the map pressures coming from one line for fpr and ecu and boost controller too running from one line, and I actually think it is off that crooked nipple that is on one runner.

Good looking Ken, Ill check that out. But Im gonna rewire this thing anyway. I think the wideband has interference with something causing it to be more erratic than even the map flucuation can make it.

 

Actually

MAPdot is set to 100 in the wizard. here is a screen grab of it. I dont think that would cause it... it should be about the least possible pw movement, right.

 

It would if your MAPdot was bouncing above 100, which is pretty easy to do.

Ken

 

I fixed that issue. in the wizard, the slider was set to 100 mapdot controll. even though I had everything set to 0 except the threshold, it was still causing issues. So I slide it over to tps and made everything 0 except threshold. threshold was 23 on tps. It fixed the pw spiking and I recalibrated my tps and left some extra space for closed throttle. its reads -5% when fully closed.