Tuning with PLX wideband?
03-23-04, 01:53 PM
#1
Tuning with PLX wideband?
Just installed the PLX M-300 unit and having a hard time tuning with it. I have an HKS S-AFR and the o2 was installed under the rear seats so I think its far enough back. I can't get the idle to lean out some it sits around 11.5-11.9 and I have the idle set at
-55%. On full throttle the afr stays around 11.0-11.9 and I get a spike of 12.1 at around 5,500 rpm. After I let of the gas it goes to either lean sign or it says air which I think is ok, is that ok?
I have a rewired walbro with resister pack in the trunk, 720's on top and rc 550's running 10-10.5 psi on a BNR stage 1 turbo. Full exhaust and TID. Greddy front mount. S4 jspec motor, stock ports miles on motor?
Are the A/R's ok? Or should I try and lean it out more?
Haha or I'll just turn up the boost to lean it out!
Can this setup handle 12 PSI?
-55%. On full throttle the afr stays around 11.0-11.9 and I get a spike of 12.1 at around 5,500 rpm. After I let of the gas it goes to either lean sign or it says air which I think is ok, is that ok?
I have a rewired walbro with resister pack in the trunk, 720's on top and rc 550's running 10-10.5 psi on a BNR stage 1 turbo. Full exhaust and TID. Greddy front mount. S4 jspec motor, stock ports miles on motor?
Are the A/R's ok? Or should I try and lean it out more?
Haha or I'll just turn up the boost to lean it out!
Can this setup handle 12 PSI?
Last edited by Silverfc88; 03-23-04 at 01:56 PM.
03-23-04, 02:26 PM
#5
I'm using the 255 walbro. I had to lean 1-3% for full throttle past 3000rpm at ten psi, thats at 14.7-15.1 volts to the pump with a third gen alternator and 12.1-.4 at idle. But I can't seem to lean out the idle, cruising it will stay around 14.7-15 A/R's.
I'm going to try and richen up that spike I get at high rpms.
I'm going to try and richen up that spike I get at high rpms.
Last edited by Silverfc88; 03-23-04 at 02:32 PM.
03-23-04, 02:28 PM
#6
On a 88 you should be able to lean out the idle with the variable resistor. What does the wideband do when you turn the variable resistor to the LEAN direction?????
03-23-04, 02:38 PM
#7
HAILERS
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Yes. It should have a R and a L embossed on the top of it. Dig the glob out. There will be a screw there. It will turn appox one half of a turn upon which it will hit its stops. Clockwise for rich, anti-clockwise for lean. You should hear the engine react when doing this, as in the idle rising and fallig a touch.
Generally a RX runs best at idle with a afr of approx 13afr plus or minus a couple of tenths. Too much towards 14afr and it will want to stall/miss/ act funny.
Generally a RX runs best at idle with a afr of approx 13afr plus or minus a couple of tenths. Too much towards 14afr and it will want to stall/miss/ act funny.
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03-23-04, 02:44 PM
#8
I'm going to have to mess with that now. I remember messing with that on my non turbo rex but I didn't even think of messing with it on this one. Maybe I can get it to idle better and not like its going to flud itself. I'll tune it to 13.0 and see what thats like instead of 11.5-11.9, maybe I'll get better gas mileage to.
Will that mess with the rest of the settings that I have for the rest of the rpm's?? Or will I have to retune again?
Will that mess with the rest of the settings that I have for the rest of the rpm's?? Or will I have to retune again?
03-23-04, 02:55 PM
#9
Lives on the Forum
Rotary engines like to run rich at idle.
There's no reason to lean out the idle if it's running okay.
Lift-off lean condition is normal.
There is basically nothing you can do about it, and it doesn't hurt anything.
-Ted
There's no reason to lean out the idle if it's running okay.
Lift-off lean condition is normal.
There is basically nothing you can do about it, and it doesn't hurt anything.
-Ted
03-23-04, 03:07 PM
#10
Yeah it runs ok, I see 300mmhg vac at idle. I just wanted to see if I can smoothen it out some, just seems like its on the verge of flooding itself.
I think the wideband was a good buy so far, I had afr's untuned before the wideband at around high 9's to mid ten's. It feels better at higher rpms now.
I think the wideband was a good buy so far, I had afr's untuned before the wideband at around high 9's to mid ten's. It feels better at higher rpms now.
