Running without o2 sensor

[Boost_Fiend]

I've been running w/o a sensor for a while to. Im running emanage though. Car runs fine. Whenever I have my sensor plugged in my car runs really rich, afr's stay at 11-12. I think it may have gone bad.

[will_drift_4_food]

I know that this is an old(-ish) thread, but NOWHERE have I found a definitive list of ECUs and what o2 sensor they are running. Maybe folks can contribute what they know to be the ABSOLUTE correct ECU+o2 sensor combinations. I purchased my blacktop S13 motor from a reputable dealer, straight from Japan. It came with a chipped E5 ECU, which is now stock due to presumably being tuned for a Z32 MAF. After I unloaded the motor at home, I noticed that it had a shimmed actuator, and the turbo coolant lines had been removed. Later yet I found that it had a skinny (Titania) sensor screwed into the elbow with no wires coming out of it, and one t25 flange stud was broken in the manifold. I didn't think much of any of these things, and others have reported similar experiences, so I just added them to my to-do list. I do believe that since someone has modified the motor in the past, it is not unlikely that they didn't run an o2 sensor at all, and just put the S13 redtop elbow on as a replacement. The only motors that the importer was getting at that time were S13 blacktops, so I never really questioned whether the ECU I had was correct for my motor.

I bought the fat sensor and plugged it in. I run rich off-throttle, but it I can tell that the ECU is making corrections by the UEGO going from 11.2-13.7, but sometimes lower than 10.0 (which means I have no idea the real AFR, thanks AEM. I kid). Honestly, I believe that to be a combination of IACV adjustment, incorrect timing, fouled plugs, and possibly a faulty CTS sensor. All of this hinges on getting my tach working (or Consult wired) so that I can set the timing properly.

My motor is in an AE86 chassis also, so various other things have changed that may contribute to an overly rich condition.

[fliprayzin240sx]

E5s are blacktop S13 ECUs and runs the fat o2 sensors, is that what you're asking about?

[will_drift_4_food]

Originally Posted by fliprayzin240sx

E5s are blacktop S13 ECUs and runs the fat o2 sensors, is that what you're asking about?

Yes, that definitely solves the E5 question.

I guess I am asking that a comprehensive SR20det ECU+O2 sensor list be put together. There is much conflicting info out there, and it would be nice for others new to these motors to have a reference, seeing as how they are so misunderstood. I understand that there are ECU threads, and MAF threads, etc., but so far no definitive o2 sensor thread (including which years/models/chassis to use for replacement sensors. Wiring diagrams might also be useful where they differ between sensors, chassis, etc.

[fliprayzin240sx]

Redtops are pretty much the only ones that use the skinny o2 sensors. Everything else after 1993 uses the fat o2 sensors. That means blacktop S13s, all notchtops (S14s and S15s).

[Boost_Fiend]

So I have a redtop running with a blacktop ecu. I'm using a skinny o2 sensor. Is this wrong?

[Sileighty_85]

Match O2 with ECU

[will_drift_4_food]

Originally Posted by Boost_Fiend

So I have a redtop running with a blacktop ecu. I'm using a skinny o2 sensor. Is this wrong?

In my opinion, yes.

[Boost_Fiend]

Just bought a new sensor from advanced auto for a 95 300zx tt. Changing it tomorrow. Hope it makes a difference

[Boost_Fiend]

Just an update. Put the fat o2 sensor in to match my ecu and the car is running much better with the o2 plugged. It doesn't go pig rich after driving for a couple of minutes. Although for some reason my idle was all screwed up and was about 300rpm high then norm so I had to lower it. And idle is alot richer then it used to be, but im guessing that has something to do with my emanage not being tuned.

[Nicelyphe]

I should def match my ECU with my o2 Sensor >_< Anyone need a Redtop ecu and has an E5 they're willing to trade? If you do, or have an E5 for sale. PM me.

[Sliderintrainin]

the kouki blacktop type x(1997-1998) came with a skinny 02.

[Kingtal0n]

Originally Posted by Sliderintrainin

the kouki blacktop type x(1997-1998) came with a skinny 02.

The S13 1998 Type-X Blacktop SR20DET engine came with a J4 ecu and a normal fat O2 sensor.

They stopped using the skinny O2 after the 1992 redtops , iirc.

My $.02:
Buy an AEM wideband gauge, and use the narrowband analog output configured to your desired cruise A/F Ratio. I set mine around 15.2-15.5 for best fuel economy. A redtop ECU automatically jumps to about 1A/F richer during idle after a few seconds, so it will idle around 13.8-14.1 and cruise around 15.2-15.5 when set this way.
This scenario gives you a wideband, which is an amazing tuning tool as well as insurance for the engine in a long term scenario, and will support any modifications you make with assurance the engine is running like it should be... And you get the benefit of a closed loop at whatever air fuel you desire.
This is how mine behaves, your experience may differ!

[Sliderintrainin]

S13 Red Top Vs. S13 Black Top - The differences : SR20DET Forum (rear-drive) - Page 2
2nd page.
The water temp sensor and 02 sensor were changed in the type x blacktop.