Tuning with O2...

[sentientpc]

Does anyone know if minor adjustments can be made to the PFC when evaluating the Stock O2 sensors, or is our sensors not wideband? I read that RSX-S comes with wideband O2 sensor so it works sweet with hondata.

I have seen some sites that sell loggers that come with a Bosch 02 sensor:

http://www.innovatemotorsports.com/lm1.php ($349)
http://www.hardracing.com/Misc/WideBand.htm ($469)

However, if our factory one is sufficient that would be sweet. Of course I'm not undermining the need to go to a dyno shop with wideband sniffer, just would like to know if our O2 sensor readings are anywhere near accurate. Thanks!

[Smaay]

Our stock O2 sensor is not worth crap for tuning...you MUST!!! get a wideband o2 sensor....Stafford has the Innovative system and it works very well....It does an excellent job street tuning to get the car running well on the road...Then take it to a dyno and fine tune it....

[sentientpc]

Thanks for the quick reply, here's a couple more questions. Can you just swap the O2 sensor with a Bosch LSU and use that with the Power FC or do you have to add another pre cat bung for it? Where's the Stafford site? Thanks!

[S|Lv3rBu||et]

http://www.staffordfabrication.com/

[Smaay]

Staffords site is undergoing an overhaul so it might still be down....here is the easiest solution....if you are using a Power FC then you only need the first O2 sensor...Unscrew the second O2 sensor, pull the carpet up under the fues box in the passenger seating area, unplug and remove the second O2 sensor....install the wideband O2 in the factory bung hole (he he he, i said bung hole :) ) then run the cable through the same hole and have your display in the cab with you....

Hard way, drill and have a second bung installed in your down pipe, then route teh wiring by your choice...

[sentientpc]

Do you mean Second O2 sensor as the one before the cat??

[DYI01]

Originally posted by sentientpc
Do you mean Second O2 sensor as the one before the cat??

he means the one after the cat

[sentientpc]

I don't see how you can use the O2 sensor after the cat has burnt all the existing fuel that your trying to measure. For example if your running rich and you mesure after the cat you'll see less richness than before the cat... Isn't that what the cat is designed to do? On some other vehicles they even inject fresh air into the exhaust system before the cat so the cat may burn the extra fuel completely. I think you need to read up on <a href="http://wbo2.com/lsu/default.htm">http://wbo2.com/lsu/default.htm</a>. The wideband O2 sensor is a cat that measures the amout of rection taking place... so if you measure post cat you will get an incorrect/modifyed measurement... Let me know if I'm off on any of this....

[Smaay]

Think about this for a second...when you go to a dyno shop where do they put the sniffer...right up your tail pipe, after all the CAT's and resonators and mufflers....right?....exactly....and i said above thats the easiest and quickest way to hook it of...of course you want the truest reading then drill and weld the bung as high up on the down pipe you can go...

[CIN]

The best way to do it is before the cat. The lambda reading will be modified by the cat after it.

[sentientpc]

I do see your point tho about dyno reading after cat.... At least once the cat is heated up the ratio of before and after should level off... :thumbup:

[DYI01]

What I am going to do is get the FJO wideband o2 sensor and controller, you can use that and integrate it intot he FC-Datalogit, and use it for tuning when you are datalogging.

[sentientpc]

Why not <a href="http://www.innovatemotorsports.com/lm1.php">http://www.innovatemotorsports.com/lm1.php</a>? You should be able to integrate it in the same way right? The O2 sensors are only $59 and with a 50-500 hour lifespan the FJO $189 kinda sucks.

[DYI01]

Originally posted by sentientpc
Why not <a href="http://www.innovatemotorsports.com/lm1.php">http://www.innovatemotorsports.com/lm1.php</a>? You should be able to integrate it in the same way right? The O2 sensors are only $59 and with a 50-500 hour lifespan the FJO $189 kinda sucks.

Im sure you could no doubt integrate it into the FC-Datalogit, it takes some knowlege of how to do that. Reading through the PDF file that comes with the datalogit you have to do calculations for each individual sensor type. But They already did all the work for the NTK type sensors, and you just need to plug it in to make it work. Thats my reasoning for using an NTK sensor over a Bosch sensor.