Tuning help
04-21-17, 08:01 PM
#1
Tuning help
Forgive me, but I figure I'll get faster responses from a wider audience here.
This situation is a part of a current thread I have here. https://www.rx7club.com/rtek-forum-1...-help-1113111/
I've been having some issues with my AFR's... When the ecu goes into closed loop, it becomes quite lean. Especially since I used arghx's conservative 9.4 rotor timing maps. I've been seeing as high as 16.2 - 16.4.
The car will only enter closed loop when I'm on the throttle enough to be very slowly accelerating. If I am just cruising at a stable speed, it runs rich open loop. Though sometimes it seems like it can't make up its damn mind.
So after some research, I decided to disconnect the o2 sensor and use the fuel corrections to tune for stoich myself.
However... Just disconnecting the o2 sensor and using no fuel corrections, the problem is unchanged. Curious of this, I monitored the o2 sensor on the Rtek using my Palm and have discovered that it reads 0.02 volts from the o2. I expected it to be zero.
I suppose what I took from my research that disconnecting the o2 sensor would mean the engine would run open all of the time and the AFR's would solely be a reflection of what is really going on.. But it is behaving like it's going closed loop way too lean and under unexpected circumstances as it did with it hooked up.
The o2 sensor is two and a half years old and is a Bosch unit. It's located in my aftermarket downpipe right off the back of the turbo, which I've never felt was ideal.
Further curious, I richened the fuel map by 10% at cruising rpm under vacuum to see how that affected things. It definitely brought down the 'closed loop' AFR's (o2 still disconnected mind you), but it also richened the 'open loop' by the same amount. Behaviors still unchanged..
I'm a wee bit confused.
TPS is dead on.
Also worth noting is that it has had this odd closed loop behavior since I did my turbo swap.
This situation is a part of a current thread I have here. https://www.rx7club.com/rtek-forum-1...-help-1113111/
I've been having some issues with my AFR's... When the ecu goes into closed loop, it becomes quite lean. Especially since I used arghx's conservative 9.4 rotor timing maps. I've been seeing as high as 16.2 - 16.4.
The car will only enter closed loop when I'm on the throttle enough to be very slowly accelerating. If I am just cruising at a stable speed, it runs rich open loop. Though sometimes it seems like it can't make up its damn mind.
So after some research, I decided to disconnect the o2 sensor and use the fuel corrections to tune for stoich myself.
However... Just disconnecting the o2 sensor and using no fuel corrections, the problem is unchanged. Curious of this, I monitored the o2 sensor on the Rtek using my Palm and have discovered that it reads 0.02 volts from the o2. I expected it to be zero.
I suppose what I took from my research that disconnecting the o2 sensor would mean the engine would run open all of the time and the AFR's would solely be a reflection of what is really going on.. But it is behaving like it's going closed loop way too lean and under unexpected circumstances as it did with it hooked up.
The o2 sensor is two and a half years old and is a Bosch unit. It's located in my aftermarket downpipe right off the back of the turbo, which I've never felt was ideal.
Further curious, I richened the fuel map by 10% at cruising rpm under vacuum to see how that affected things. It definitely brought down the 'closed loop' AFR's (o2 still disconnected mind you), but it also richened the 'open loop' by the same amount. Behaviors still unchanged..
I'm a wee bit confused.
TPS is dead on.
Also worth noting is that it has had this odd closed loop behavior since I did my turbo swap.
04-23-17, 06:45 AM
#2
Hmm with it unpluged it should be open and if it's reading almost zero maybe the wire is grounding out somewhere. U may want to closely inspect the wire.
or get a multimeter set to ohms, unplug the ecu completely. And measure the resistance and continuity from the o2 plug in vs ground. Should be infinate(open)
. What wiring harnesses at you using? Na or t2 I think the knock sensor has the same type of connector perhaps they are mixed up?
or get a multimeter set to ohms, unplug the ecu completely. And measure the resistance and continuity from the o2 plug in vs ground. Should be infinate(open)
. What wiring harnesses at you using? Na or t2 I think the knock sensor has the same type of connector perhaps they are mixed up?