Holley Efi Closed loop and learn functions explained

[@twomontess]

You just stopped me from chasing my tail !! Thank you She was reading dead lean at idle and I couldn’t figure it out. Thank you !

[@corvettefever360]

From someone who has over 20 years experience in high performance engines, etc, etc myself, I can tell you that this guy is one of the few who makes videos & actually really knows what he is talking about! There are definitely others, but most making videos have a half ass understanding, &/or don't have a clue, & giving bad information. This is one you should listen to.

[@theholleyefiguy]

thanks bud i appreciate the kind words

[@shaneepps2315]

@@theholleyefiguy quick question regarding O2 sensors and closed loop...if I leave the learning off below 2200rpm per the example in the video, does the O2 still work in that instance? Reason being you see lots of sensor crap out early due to not warming up properly etc...will that help it?

[@jamesaustin4044]

I was at my wits end trying to get my cold start parameters to work. Nothing I did made a difference! Now I know that unlike an OEM ECU, the fuel modifiers will not work unless it's in closed loop. Turned off the temp requirement for CL and BOOM, everything started working properly! Thanks Devin!

[@68chevelleconcours]

Great job in explaining. I’ll have to watch it a few more times but I’m getting closer.

[@smiszuk18]

This is the most ive learned on the sniper since I installed it. Great video!

[@finlay230]

Great vid, one of the best explenations yet 👍

[@LSXREVIVAL]

Thank you for taking the time to explain all this . Very helpful! I hope you keep sharing if you have time.

[@KSIXRIDER]

Great presentation of data. Similar to the Dynojet Power Commander autotune for the motorcycles. Limiting the fuel trim would have saved the motor after a O2 sensor went bad in the middle of a roadrace event Keep up the great work!

[@kevin_nagle]

Super informative

[@modmotorheadful]

Thanks for all the videos you make really appreciate it 👍👍👍

[@TheProchargedmopar]

👍 Cleared a few things up in my brain on the sniper learn table transfer.

[@txslugga06]

Always good stuff as usual DV

[@Diondo26]

thanks for help...

[@mrrobot545]

As always great stuff.

[@robfling4107]

Thank You!

[@waybad]

How does smoothing the tables make it better or does it? I have quite a bit of a lean 15.7 in cruise areas and wide open in the 12.5. Same for the spark tables. Should I do a smooth all? Thank you for all your info and videos. 👏👏

[@sebfullick5011]

very well explained

[@minitrucker04]

Great info, thanks!

[@ShawnDickens]

It's 8 to 12 after the collector to make sure you get a reading of more than one or two primaries, turbo outlet is already mixed so it can be right at the outlet.

[@theholleyefiguy]

Except if its right after the turbo you'll melt the sensor So like I said ideally 12-18 inches

[@ShawnDickens]

@@theholleyefiguy so you can mount a Bosch before the turbo with pressure compensation and it's fine, but to close after and it will melt? We have one a few inches away, but we are only making 1800HP, maybe with higher power it's an issue?

[@theholleyefiguy]

Try it and report back

[@ShawnDickens]

@@theholleyefiguy Try what, the O2 right after the turbo? Been that way for a while now. Ran E98 and Q16. changing to twins, so not sure if it will stay as exhaust might be longer than 14" in the new setup. Or if you are talking about 02 before the turbo, can you explain why there would be controllers that do back pressure compensation? Not like you need that N/A, supercharged, or on spray.

[@evltwins]

Learned something new today. Thank you. I didnt know you could change the values in the learn table before applying it to the base. It never occurred to me to try to change it. It brings a question to mind too. In your example learn table, it shows a large fuel change at 6400 and 27 psi. Now in your example the surrounding cells are relative graduated leading up to the high change in that one cell. However, if the surrounding cells were relatively low changes, say 1-3% and then suddenly you had a 10-15% change in one cell, if the 3d graph was smooth in that area would you be inclined to disregard that one cell or at least change that cell to more match the surrounding cells? Or do you take the learn table as gospel?

[@twiztedracingokc]

What if I'm running a twin turbo set up with the holley terminator x ? It only has the capability to only run one oxygen sensor? Doesn't twins need one on each bank?

[@JOettel325]

You don't "have" to have an O2 on each bank. The Dominator will average both sides. The terminator X will just take that side only. Still works just fine for lots of people.

[@twiztedracingokc]

Thank you. The turbo world is still new to me.

[@jeepwk6.5L]

Personally if it was me I would run a AFR gauge to the side I’m not monitoring with the terminator, so you could at least compare and have a reading in the cab

[@jeepwk6.5L]

For instance I’ve had 1 bad injector and one side was super rich and one was super lean but at the turbo it read perfect lol

[@cindyrussell4078]

I have stealth sniper4500 on a blueprint 632 initial startup went way rich would foul plugs before warming up to temp afr sensor 8” past collector no vac leaks ? Any help would be appreciated Thanks

[@68chevelleconcours]

Did ya get your problem figured out? I think I have the same problem. I’ve manually tuned it in open loop but it’s showing 20-40:1 afr. False lean from what I understand, likely due to the aggressive cam.

[@billbraski2175]

Thanks

[@OverKillGTR]

I have been battling the same lean condition at low rpm and idle....So am I correct in assuming that if my tuner is telling me that I need to move my O2's into my primaries so he can get my open header racecar to idle I need to find a more competent tuner?

[@JOettel325]

How far after the O2 sensor does your exhaust end? Do you have any extension after the headers or just wide open?

[@CrazyCowboyBuilds]

Devin! Would you be able to help my setup a base tune on my Terminator X LS turbo if I paid you?

[@CrazyCowboyBuilds]

my IG is Car_Building_Inspiration

[@MrAllan5oh]

Hello when does your book titled "11,000,000 ways to blow up an LS engine" come out?

[@Califormula]

🙇🏾‍♂️

[@baddaxx7852]

No it measures a LACK of oxygen... good work otherwise

[@laska4075]

Good stuff