O2 sensor placement in a turbo downpipe! Tech Tip Tuesday

[@V8sareslow1]

If you run too lean, you may think the sensor isn't working. Just doesn't have enough fuel to read so it doesn't work. If a sensor reads rich all the time (especially when off throttle), the sensor could be fouled out. Easy way to tell is by pulling fuel from the tune but it stays rich on the gauge. And if you have any exhaust leaks BEFORE the sensor (blown gaskets or exhaust cracks), that can mess with your proper fuel delivery because the oxygen that gets pulled in makes the ecu think the car is lean so it adds fuel, thus you run rich even though you think you have a proper reading. Just some things to keep in mind.

[@KenFilmsCars]

Another good point regarding them reading bad is if they get a knock, have heard some brand new o2s can fail or read wrong purely if they are dropped or hit so look after them guys

[@Autofaze]

Always dig these tech tips from motion!

[@jimc3678]

Thanks for that important information. Never considered the condensation element.

[@zachrehak2391]

I’d love a Tech Tip video covering plumbing a remote mount water pump setup with and without a thermostat! Asking for myself because I have no idea how.

[@jaydoleshal8481]

Do a video on your drag week trailer and what you carry.

[@Glen_Patti_H]

I was just wondering about that for the first turbo system I'm building. Now I know! Thanks!

[@transamriderql]

I'm so thankful for this information

[@tomlompa6598]

I like that word.....angularity. Very cool! 😎

[@BlackTop_MafiaRP]

Awesome tech tip. But! When are we gonna get updates on the extreme blazer build and updates for new parts for s10s? Love the channel guys.

[@MotionRaceworksOfficial]

Video coming soon! Brian and I spent the weekend on it ;)

[@BlackTop_MafiaRP]

@@MotionRaceworksOfficial awesome! Thats great news not very much informational videos out tgeir about the 2nd gen s10 blazers and would love to see more. Thanks guys

[@joecameron3406]

Great information as always I enjoy tech tip Tuesday

[@rhondalewis8991]

How bout a build video of your Drag Week trailer?

[@jarrettlabate5595]

Awesome that answered most of my questions except for one. If I am venting my wastegate back into my downpipe should the O2 sensor be before or after the wastegate exhaust is introduced?

[@V8sareslow1]

That really shouldn't matter honestly so long as no oxygen is able to flow past the sensor. If a wastegate dumps to atmosphere, that exhaust never sees the O2 sensor anyway. However, keep in mind that the wideband will only tell a reading of all cylinders combined. If one cylinder is running leaner than another, your wideband reads the average of all cylinders, and might be difficult to tell that one cylinder is lean (somewhat clogged injector for example) . Just something to keep in mind.

[@RecklessRegal]

Great video with excellent information as always guys!

[@thefullbeanznetwork7578]

Cheers mate just what I needed to know 👌

[@jcnpresser]

I work on everyday cars, and they do go bad and still read, if your cars idling and the afr is jumping around all over the place, chances are it’s bad. On fords we can data log the current that the o2 is using to monitor the afr, usually it’s close to 0.0 mA on a 14.7 afr. If it’s reading kinda out there like for example.437 mA at idle it’s probably bad, the engine run of the other sensor in closed loop fault, If that helps anyone.

[@joeyk4909]

What about a single turbo set up with full exhaust muffler and a cut out?

[@TWIRKNOLOVE]

This isn't any different to the advice he gave. Just orientate the angle right and keep it 8-12" downstream of the turbine

[@sloppycscustoms2725]

🤙🍕 Dude your tech stuff specifically has helped me out so much. Much love to you guy a Motion! 🤙🍕

[@ricebox6664]

Great video, thanks 👏

[@andrewsimmons2929]

I have my 2 waste gates plumbed back into the single 4 inch exhaust heading back the car to the firewall out of a single turbo mounted in typical radiator spot. Should my O2 be mounted 8-12 inches from the turbo or move back and pick up the waste gate gasses too? The waste gate dump into the 4 inch is approximately 12-14 inches from the turbo. Is that a concern?

[@claas90017]

What about when the WG goes back into the DP, should it be before or after where WG goes back into the DP

[@charpocus]

Thanks

[@DigginZ71]

I also have heard that extended periods of key on, engine off is supposed to contribute to the death of sensors. I do not know the science behind it, but may be something worth exploring further or even testing.

[@V8sareslow1]

It heats them up from the constant key on and off cycling. Eventually shorts them out. The new AEM wideband sensors are TERRIBLE about this. I install my power wire at the fuel pump relay so that the wideband won't turn on unless the car is running. I don't want it powering up just from an ignition switch turn when I don't plan on starting the car. Uploading a new tune for example.

[@kerrygatling663]

@@V8sareslow1 sounds like good advise👍

[@the_og_scootkentwest7495]

I had the o2 in my daily go bad and still read. It was just going through tons of fuel and still reading lean.

[@JordanJones-ud8il]

Is this for the holley X or X-max or for your guage?

[@1991CALYPSO]

We need more Blazer videos

[@thomasjohnson1142]

Absolutely they can go bad and still read as a tuner I have a mounted aem Wideband for my supercharged Sierra and you can spot it when your chasing you tail dialing in your fuel lol. It will be sporadic or unstable . Closed loop divers or no Wideband well if it’s still operating within the error threshold no DTC will set and your fuel mileage will probably tank , fuel trims will be unstable or just poor performance. Plus super dangerous for you vehicle. If you went 100,000 miles there well over do. God Bless.

[@crash5811]

Why place the O2 After the turbo? Why not in the collector, pre-wastegate?

[@MotionRaceworksOfficial]

Heat becomes a concern pre turbo

[@crash5811]

@@MotionRaceworksOfficial Guess i didnt realize the EGTs were that much higher w boost. Makes sense if you think about it though..

[@djrisberg]

Reach out and help the boosted boiz on O2 placement in their current hatchback project...right now it's all wrong...

[@Kickdoe357]

What’s best to use... a O2 or EGT’s for tuning big nitrous?

[@MotionRaceworksOfficial]

Spark plug reading

[@V8sareslow1]

Sensors can lie (and also has a delay). Spark plugs don't. Good to watch the sensors but don't rely on them 100%. Learning to read plugs is a good skill to learn. Especially with different fuels.

[@Phil-rs5wl]

I was wondering if you could run one for each cylinder

[@wajihalsaihati2059]

You can do EGT

[@rogerdeaver8544]

YES,BUT YOUR TUNE OVERALL CAN BE MONITORED WITH OTHER DATA AND DUTY CYCLE AND A/F RATIO .

[@joeystrittmatter6890]

Good morning everyone

[@dlawson8993]

On a single turbo ls. Should I keep them in the stock location or put both on the down pipe?

[@TWIRKNOLOVE]

The stock location doesn't exist once you go turbo.

[@1upJeCK]

If I already have pro tune for a subaru that has the 02 sensor in manifold (pre turbo) and I move it to my downpipe, will I need to be retuned? Or she gunna learn quick enough with readings?

[@TWIRKNOLOVE]

No difference. Exhaust gasses are equal in AFR pre or post turbo (assuming the o2 is AFTER the collector on the manifold).

[@1upJeCK]

@@TWIRKNOLOVE TY

[@RedneckTipsByScott]

Bung Hole.. Bung! I need tp for my bunghole!

[@marcstlaurent3719]

Thank you Doug , any problem with O2 sensor overheating that close , I have had some problems with my AEM fouling fast on race gas any thoughts ? On a side note do you modify your Alternator when you you run a 14 volt battery ? Thanks again Doug .

[@roylcarter87]

Alot of O2's don't live very long with an oxygenated fuel. And no there's no mods to do for the alternator since they produce 14.2-14.7 normally.

[@MotionRaceworksOfficial]

Haven’t ever had an issue with race gas personally especially when applying these principles. But not saying it’s Not an issue. I typically put mine in that 8-12 inch range. On the alternator no modifications needed

[@marcstlaurent3719]

@@roylcarter87 yes but you need 16.8 volts to service a 14 volt battery and put a surface charge on it hence why an alternator puts out 14.4 volts on a twelve volt system to cover the 2.4 volts per cell and how a 14 volt battery gets the extra voltage is with one extra cell for seven .

[@marcstlaurent3719]

@@MotionRaceworksOfficial thanks for the reply Doug .

[@jamesstdenis8458]

Marc st Laurent get a smaller alt pulley to get the most out of it! It will spin faster at same rpm

[@natepierce1281]

Love these videos, just sent you a DM on instagram. (: