help setting up plx m-300 with s300 for closed/open loop

hiperformance · Post by **hiperformance** » Sat Aug 11, 2007 3:11 am

using the offset voltage, I am trying to match the M-300 to the logger display. I have it close. using -0.9v but its hard to get it perfect. the car is running while I am trying to do this, my M-300 display flucuates quite quickly and the logger is more steady. is that right? am I doing it wrong?

thanks.

hiperformance · Post by **hiperformance** » Sun Aug 12, 2007 1:48 am

ok, so I was playing with the low speed fuel and for the hell of it, I decided to try and rich-en up 4 boxes that were highlighted while the car was idling, I wanted to see the change it made in a/f on the plx. it worked fine, but I noticed that the live datalog a/f did not follow the plx as the table was richened? the datalog followed all the way until 15.7 or so, but would not read any richer as I richened it up, the datalog stayed fluctuating around 15.7 but the plx kept going richer as I adjusted the table richer, all the way to 11.5 where I stopped. I was reading that if I use the ELD input, I need to remove R136 and R138, so I did, once I did that the datalog reading froze at 16.00, when I started changing the offset voltage, it stayed frozen just at a different value? so I scraped using the ELD and switched to b6, activated b6, adjusted the offset to get the datalog close to the plx, which fluctuates quicker then the hondata log and I repeated my low speed fuel adjustment of the same 4 boxes richer. the out come was the same, the datalog did not follow the plx after about 15.7. next I scraped method #1 and ran the white from the plx into the o2 wire as the direction state in method #2, went options, settings, checked o2 and the bingo. worked perfect, zero adjustment was needed for the offset voltage, I did my low speed fuel test as I did above, richening it up all the way to 11.5, the datalog followed just fine. what the heck am doing wrong with method #1? I want to be able to use close loop. someone please help.

by the way, I checked the values coming out of the plx's white wire and they were correct, it also changed accordingly when the gas pedal is pressed or the fuel table was changed.

cardinal811 · Post by **cardinal811** » Sun Aug 12, 2007 3:44 pm

I followed the closed/open loop option and I cant get the wideband to display on the display screen, it still shows the narrowband. I want to run safe by being able to set what I want and then the ECU fine tunes it after I get off the dyno for long term use. Hondata WHY ARE WE TO CUT RESISTORS WHEN EVERYONE THAT HAS THE S300 IS USING WIDEBANDS. WHY IS THIS NOT IN A PROCESS OF YOUR MANUFACTURING.

Post by **Spunkster** » Mon Aug 13, 2007 10:41 am

Since I do not have your vehicle in front of me to see what you have done it is nearly impossible to tell what the problem is.

I personally own 3 cars with the PLX setup using method #1 and did not need to remove any resistor or do anything beyond what is in the instructions.

hiperformance · Post by **hiperformance** » Mon Aug 13, 2007 12:40 pm

Spunkster wrote:Since I do not have your vehicle in front of me to see what you have done it is nearly impossible to tell what the problem is.

I personally own 3 cars with the PLX setup using method #1 and did not need to remove any resistor or do anything beyond what is in the instructions.

I just removed the resistors because in help, under "wideband lambda settings" it says: Note that if the ELD input (D10) is used then R136 and R138 (US ECUs) may need to be removed. I just wanted to try it and see if it would fix my problem of the datalog not following the plx past 15.7. once i cut the resistors, the datalog froze at 16.0. my real problem is finding out why the datalog dosent follow? I want to use method #1.

I know you are not going to have any problems, it your company and your familiar with the product. I am new and learing, do you have any suggestions on what I should check, or is there a setting I am overlooking?

thank you for your time.

Post by **Spunkster** » Mon Aug 13, 2007 1:10 pm

You will need to use a multi meter ans see what the outputs form the PLX are doing...the display for hte plx may be workign, but the outputs may not be.

hiperformance · Post by **hiperformance** » Mon Aug 13, 2007 1:41 pm

Spunkster wrote:You will need to use a multi meter ans see what the outputs form the PLX are doing...the display for hte plx may be workign, but the outputs may not be.

I already did that, the output from the white wire on the plx is fine? i will go today and hold the rpm at 1,2,3,4K and log the output with my multi meter and post it. it just seems strange that when i take that white wire off of b6 or eld and input it through o2 it works fine and data log follows the plx perfect, its only when its input through b6 or eld, then it will not follow past 15.7 or so? would a bad ground or power affect it like that?

thanks.

hiperformance · Post by **hiperformance** » Tue Aug 14, 2007 1:27 am

Voltage output from the white wire on the PLX M-300

Idle: 3.5
2k: 4.2
3k: 4.5
4k: 3.9

I did note the tach is off by 200rpm, so above will be off by 200rpm.

I don't know, when hooked up in method #1, the data log will not follow the plx accurately?

any thoughs. thanks.

hiperformance · Post by **hiperformance** » Mon Aug 27, 2007 3:00 pm

still having this problem, any suggestions?

Post by **Spunkster** » Mon Aug 27, 2007 4:51 pm

You can't go by RPM as that has nothing to do with the AF ratio. withthe car not running and the key in the on position, the PLX should be on and you will be able to datalog and get the voltage offset right as it will not be fluctuating as much.

hiperformance · Post by **hiperformance** » Tue Aug 28, 2007 2:23 am

Spunkster wrote:You can't go by RPM as that has nothing to do with the AF ratio. withthe car not running and the key in the on position, the PLX should be on and you will be able to datalog and get the voltage offset right as it will not be fluctuating as much.

i was not trying to set the voltage off set. these numbers i posted were me, misunderstanding what you were asking me to provide. i though you wanted to know what the voltage out put was for the 0-5v wire at different rpm's, which was:

Idle: 3.5
2k: 4.2
3k: 4.5
4k: 3.9

these numbers are meaningless, sense you have no idea what the afr's were for the voltage i listed. so here are new numbers from the 0-5v plx out put.

afr: voltage
air: 5.0
14.7: 2.5
12.4: 1.28
12.2: 1.20
11.5: 0.85
11.4: 0.80
11.0: 0.61
10.9: 0.58
10.6: 0.45

the problem is the lambda value in the display will not follow the plx past 15.7. as fuel is added, the display stops at 15.7 but the plx will continue going rich as it should, sense i am adding fuel. the car was on a dynojet, we used the dyno wide band and it confirmed that the plx was correct. tonight i hooked my multimeter up to the 0-5v white wire on the plx to record some voltage out puts. this is what i got.

so i must be doing something wrong for the set up of method #1, when hooked up method #2 taking the 0-5v and inputting it through o2 and checking off o2 for the source, the display lambda value is spot on with the plx with 0 voltage offset.

i am going crazy.

Post by **Spunkster** » Tue Aug 28, 2007 11:10 am

Have you cut the wire that originally went to the ELD?

hiperformance · Post by **hiperformance** » Tue Aug 28, 2007 12:37 pm

Spunkster wrote:Have you cut the wire that originally went to the ELD?

Yes, the wire is cut on the jumper harness about 2" from the ecu. the 0-5v white from the plx is attached to that wire coming from the ecu.

Post by **Spunkster** » Tue Aug 28, 2007 1:21 pm

The only way I can reproduce what you describe is if i do not disconnect the ELD wire from the eld itself. Double check your wiring.

Disconnect the white wire from the eld input and datalog and look at the eld voltage in the sensor list What is it doing?

hiperformance · Post by **hiperformance** » Thu Aug 30, 2007 1:43 am

Spunkster wrote:The only way I can reproduce what you describe is if i do not disconnect the ELD wire from the eld itself. Double check your wiring.

Disconnect the white wire from the eld input and datalog and look at the eld voltage in the sensor list What is it doing?

Great suggestion. I checked the eld sensor voltage. the voltage did not match the out put of the plx, because I cut and hooked up the plx to the wrong wire. I don't know why, I read the directions several times, I had cut b10 and hooked up the plx to it. for some dumb reason I had b10 burned in my mind, once I saw the wrong voltage, I checked again, saw it was b10 instead of d10. what I did was reconnect b10, and while watching the eld voltage in the sensor list, I cut d10 and watched the voltage go to 4.5v (open) I want to kick my self.

next question, so now I have the off set voltage set at -0.3, the data log follows the plx nicely from about 13 to 16. but from 13 to 11 it seems to go a few points off, the data log is reading leaner then the plx, between .2 to .4 points off also once it gets to 11.82 the data log for afr freezes, all other values in the display continue but the lambda freezes at 11.82, if I keep richening it up, the plx and dyno afr's will continue in to the 10's but the data log stops at 11.82

your thoughts on my two questions please.

thank you.

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