Hondata

My search button is exhausted. My brain is fried. I am seeing inconsistent and incomplete info and posts all over the internet about which/how widebands to hook up with s300.

When I get the money, I want to use the PLX systems bc they are recommended by the hondata website.

http://www.plxdevices.com/wideband.php

Here are my questions:

1. Most important: If I am going to use PLX system for its wideband AND narrowband output (for open AND closed loop, respectively) do I have to remove resistors in my p72 ECU? ANDDD can I leave them out, or do I have to reconnect them after street tuning, so that my closed loop can use the narrowband output? I don't like the idea of having to continually dis/reconnect resistors.

2. Will I need a toggle switch to toggle the two functions? (idea gotten from internet)

3. Is it possible to....weld another o2 sensor port into the exhaust piping, therefore allowing for the continued use of stock o2 sensor, but allowing for installation of the new wideband?


If you can't tell, I want to have reliable use of openloop and closedloop operations. Theoretically, I prefer option 3....leave stock alone and use it for narrowband, and install the wideband in a separate location for connection to a hondata pin-input (and maybe a pillar gauge). All I would need is a 4in section of exhaust piping from another honda exhaust and I can weld it in myself.

--TJ

http://www.hondata.com/techplxwiring.html

The software also has the option now to run closed loop using the wideband signal.

You can put as many bungs in as you want.

Spunkster wrote:http://www.hondata.com/techplxwiring.html

The software also has the option now to run closed loop using the wideband signal.

You can put as many bungs in as you want.

That is one of the pages I have read. thanks for adding the part about using wideband signal to run closed loop. :) That means there won't be a need for the bung or the toggle stuff, I guess.

So, what is this I heard about having to remove resistors 136 and 138 on some ecu's? Do they need to be removed on my p72 for me to run the PLX system and gauge? And will I EVER need to reconnect them for ANY reason? (tuning, putting p13 back on it, etc??)

Thanks,

--TJ

The only thing not mentioned is that you can run the wideband signal to D14; however, you won't be able to use D14 and the wideband signal for closed loop.... It is necessary to use D10 if you want to use closed loop with the wideband signal.

ITR1102 wrote:The only thing not mentioned is that you can run the wideband signal to D14; however, you won't be able to use D14 and the wideband signal for closed loop.... It is necessary to use D10 if you want to use closed loop with the wideband signal.

OK..so only one wire from the controller. And it plugs into d10. Result: wideband signal, but I can run open or closed loop? Good info!! Thanks for the help!

So about those resistors?

tb144050 wrote:

ITR1102 wrote:The only thing not mentioned is that you can run the wideband signal to D14; however, you won't be able to use D14 and the wideband signal for closed loop.... It is necessary to use D10 if you want to use closed loop with the wideband signal.

OK..so only one wire from the controller. And it plugs into d10. Result: wideband signal, but I can run open or closed loop? Good info!! Thanks for the help!

So about those resistors?

You may need to remove them for more datalogging accuracy. Try it out before removing anything though. If your readings aren't close in the program to what they are on the gauge after trying the offset voltage, then I would try removing the resistors as suggested. I haven't had to remove anything, though. PLX = awesome. I have a slight offset to compensate for voltage differences due to the wiring/ground signal, but the software matches the wideband.

But I wouldn't be afraid to remove them if need be. You shouldn't have to worry about putting them back in either.

Do those resisters go to one specific pin on the ecu? In other words, do they increase accuracy ONLY on d14 (the normal o2 pin)?

Not sure on that one

tb144050 wrote:Do those resisters go to one specific pin on the ecu? In other words, do they increase accuracy ONLY on d14 (the normal o2 pin)?

The R136 and R138 resistors are for the ELD pin (D10) (US ECU)

AREA876 wrote:

tb144050 wrote:Do those resisters go to one specific pin on the ecu? In other words, do they increase accuracy ONLY on d14 (the normal o2 pin)?

The R136 and R138 resistors are for the ELD pin (D10) (US ECU)

Is that ALL us ecu's? or certain us ecu's? Thanks for everyone's input. We are narrowing it down to a concluded, detailed, concrete answer. :D

ive had my plx for 6 years no issues tuned prob 40 cars with it. ive had aem,FAST,autometer and innovative crap widebands and none compare to plx. great product. kinda off topic srry

cloviskilla wrote:ive had my plx for 6 years no issues tuned prob 40 cars with it. ive had aem,FAST,autometer and innovative crap widebands and none compare to plx. great product. kinda off topic srry

What kind of problems did you have with the innovate wideband?

tb144050 wrote:Is that ALL us ecu's? or certain us ecu's? Thanks for everyone's input. We are narrowing it down to a concluded, detailed, concrete answer. :D

If you have an obd1 p72, like I am, I recommend cutting R136 and R138, just use a tinsnips or a good scissors and cut one leg off the resistor and slightly lift it off so it's at a 30-45 degree angle (leave the other end connected).

I have the exact same ecu but an AEM wideband and I DID have to cut these resistors in order to have accurate readout on pin D10 ELD input. Be sure to check the box in sManager to disable ELD, since that's what D10's normal function is when not used as an aux input.

Regarding the o2 bungs, I'd recommend adding a bung for the aftermarket wideband and keep your OEM narrowband in use. It's one additional sensor to datalog, plus you're sticking with OEM sensors. I know you can use wideband output --> narrowband input, but spend the $20 at an exhaust shop and have the extra bung welded in. That's what I did and I never looked back at that decision. Good luck.

Hell, on my s2000 (which already has a wideband OEM o2 sensor), I STILL added an aftermarket sensor. Just one extra sensor to sniff the mixture, and it's slightly more accurate at richer mixtures, thus Hondata's addition of AF.corr sensor on cars equipped with factory widebands . I digress, sorry.

Cliff notes: D10, cut those resistors, & 2 > 1.

My 2c.

Mike

AREA876 wrote:

cloviskilla wrote:ive had my plx for 6 years no issues tuned prob 40 cars with it. ive had aem,FAST,autometer and innovative crap widebands and none compare to plx. great product. kinda off topic srry

What kind of problems did you have with the innovate wideband?

i had a lm-1 and was tunning a car and the box caught on fire internally and smoked the customers car out. and if you ever try to get innovative to warranty or give you the time of day over the phone is like a act of congress. i will never buy another innovative product.