target AFRs on WB with meth?
- Thread starter Flyin Ryan
- Start date
mrweelr
New member
Re: target AFRs on WB with meth?
I've got my BIN patched with Dig's linear PLX file and Datamaster's AFR Tgt value is averaging .5 higher than the PLX R-500's. Anyone know what the issue could be? I guess I need to adjust the voltage to lambda values in the WB02 output, but I don't know what they should be. Here are the stock values from the WB02 output configuration screen:
Lambda .69 .71 .73 .75 .77 .80 .82 .84 .86 .88 .91 .93 .95 .97 .99 1.02 1.04 1.06 1.08 1.10 1.12 1.15 1.17 1.19 1.21 1.23 1.26 1.28 1.30 1.32 1.34 1.37
Voltage .13 .29 .45 .60 .76 .92 1.07 1.23 1.39 1.54 1.70 1.86 2.01 2.17 2.33 2.49 2.64 2.80 2.96 3.11 3.27 3.43 3.58 3.74 3.90 4.05 4.21 4.37 4.52 4.68 4.84 5.00
Anyone know what the exact voltage values should be to get the AFRs on the PLX and DM identical?
I've got my BIN patched with Dig's linear PLX file and Datamaster's AFR Tgt value is averaging .5 higher than the PLX R-500's. Anyone know what the issue could be? I guess I need to adjust the voltage to lambda values in the WB02 output, but I don't know what they should be. Here are the stock values from the WB02 output configuration screen:
Lambda .69 .71 .73 .75 .77 .80 .82 .84 .86 .88 .91 .93 .95 .97 .99 1.02 1.04 1.06 1.08 1.10 1.12 1.15 1.17 1.19 1.21 1.23 1.26 1.28 1.30 1.32 1.34 1.37
Voltage .13 .29 .45 .60 .76 .92 1.07 1.23 1.39 1.54 1.70 1.86 2.01 2.17 2.33 2.49 2.64 2.80 2.96 3.11 3.27 3.43 3.58 3.74 3.90 4.05 4.21 4.37 4.52 4.68 4.84 5.00
Anyone know what the exact voltage values should be to get the AFRs on the PLX and DM identical?
MIGHTYMOUSE
Turbo F body guy
Re: target AFRs on WB with meth?
your true tail pipe air fuel ratio definitely changes and needs to be lower when you mix alcohols.
HOWEVER since you, your brother, and your moms cousin all use 02 meters calibrated for gas and not for this new specific to you mixture of gas and alky; it is a lot easier to just pretend you are using all gas and look no further.
for example, you could switch over to meth entirely, double the fuel supply to get your 5:1 or whatever it is... but it still comes out to .80 lambda for example which is still 11:7 on a gas calibrated meter
look at the table here
http://www.turbodiy.com/Mopar Pages/alcohol_spray.htm
your true tail pipe air fuel ratio definitely changes and needs to be lower when you mix alcohols.
HOWEVER since you, your brother, and your moms cousin all use 02 meters calibrated for gas and not for this new specific to you mixture of gas and alky; it is a lot easier to just pretend you are using all gas and look no further.
for example, you could switch over to meth entirely, double the fuel supply to get your 5:1 or whatever it is... but it still comes out to .80 lambda for example which is still 11:7 on a gas calibrated meter
look at the table here
http://www.turbodiy.com/Mopar Pages/alcohol_spray.htm
Tooky
Serious about performance
Re: target AFRs on WB with meth?
I agree, double and triple check your wiring if necessary. In my experience installing 3 PLX M-300's into GM turbo ECMs, the stock narrowband wiring is the MOST sensitive to any wiring/grounding issues whatsoever. I follow PLX's instructions explicitly!!
WyoSyclone wrote a great guide here: http://www.detroitturbo.com/wiki/do...evices_sensor_module_wires_to_the_factory_ecm, not sure if that helps you or not.
Also make sure you have adequate gauge wires!! One of my installs went bad because I used too thin/long of a wire. I think it was 18ga that was insufficient and I ended up with 16ga or 14ga.
I agree, double and triple check your wiring if necessary. In my experience installing 3 PLX M-300's into GM turbo ECMs, the stock narrowband wiring is the MOST sensitive to any wiring/grounding issues whatsoever. I follow PLX's instructions explicitly!!
WyoSyclone wrote a great guide here: http://www.detroitturbo.com/wiki/do...evices_sensor_module_wires_to_the_factory_ecm, not sure if that helps you or not.
Also make sure you have adequate gauge wires!! One of my installs went bad because I used too thin/long of a wire. I think it was 18ga that was insufficient and I ended up with 16ga or 14ga.
mrweelr
New member
Re: target AFRs on WB with meth?
I found four 0.1uF 50v monolithic capacitors in the original R-500 box. The instructions state the following:
"If you plan to integrate the R-500 with stand alone engine management systems or aftermarket data loggers, make sure that the black wire is connected physically as close as possible to your device's ground to ensure that the same reference ground is seen by both the R-500 and your application. A large voltage offset may be seen if device is poorly grounded."
These are my wiring connections:
-PLX gray wire (simulated narrowband) to ECM E14
-PLX pink wire (knock sensor input) to ECM F9
-PLX red/black wire (analog input 1 for TPS) to ECM F13
-PLX black wire (ground) to ECM B9
-PLX light green wire (WBO2 AFR) to ECM F14
-PLX red (+12v) to ignition-switched 12v supply
-PLX yellow (+CH) to EGT probe yellow
-PLX red/yellow (-AL) to EGT probe red
I soldered capacitors between ECM B9 and the narrowband (gray) and wideband (light green) output wires from the PLX. It made no difference whatsoever. Datamaster is still showing .5 higher than the PLX display. Should I be using a different ground for the R-500 other than the B9 pin on the ECM? I'm thinking I just need to adjust the lambda/voltage values in the R-500 to get the numbers to match. Should I increase the lambda values in small increments for each voltage value in the WB02 output screen? Out of ideas at this point.
I found four 0.1uF 50v monolithic capacitors in the original R-500 box. The instructions state the following:
"If you plan to integrate the R-500 with stand alone engine management systems or aftermarket data loggers, make sure that the black wire is connected physically as close as possible to your device's ground to ensure that the same reference ground is seen by both the R-500 and your application. A large voltage offset may be seen if device is poorly grounded."
These are my wiring connections:
-PLX gray wire (simulated narrowband) to ECM E14
-PLX pink wire (knock sensor input) to ECM F9
-PLX red/black wire (analog input 1 for TPS) to ECM F13
-PLX black wire (ground) to ECM B9
-PLX light green wire (WBO2 AFR) to ECM F14
-PLX red (+12v) to ignition-switched 12v supply
-PLX yellow (+CH) to EGT probe yellow
-PLX red/yellow (-AL) to EGT probe red
I soldered capacitors between ECM B9 and the narrowband (gray) and wideband (light green) output wires from the PLX. It made no difference whatsoever. Datamaster is still showing .5 higher than the PLX display. Should I be using a different ground for the R-500 other than the B9 pin on the ECM? I'm thinking I just need to adjust the lambda/voltage values in the R-500 to get the numbers to match. Should I increase the lambda values in small increments for each voltage value in the WB02 output screen? Out of ideas at this point.
Mario65
Hotrodicus Supersonicus
Re: target AFRs on WB with meth?
I have a plx dm-5 combo. My guage was accurate but the reading from any source off the aldl was 10.0. It ended up being one of the bad capacitors they tell you to put inline. PLX said it wasnt necessary so I just bypassed it and the aldl reads the same as the guage.
I have a plx dm-5 combo. My guage was accurate but the reading from any source off the aldl was 10.0. It ended up being one of the bad capacitors they tell you to put inline. PLX said it wasnt necessary so I just bypassed it and the aldl reads the same as the guage.
Aeroking
e.i.
Re: target AFRs on WB with meth?
had the same problem, ended up being the TX and RX plugs were mixedup. I switched them, and it was fine
had the same problem, ended up being the TX and RX plugs were mixedup. I switched them, and it was fine