SOLVED Lamda issues after speedtech install

Bmxr152

Specialist
Jul 13, 2019
50
Lake tahoe
So I have the speedtech kit installed and a basic tune from v8bait to get me going. I'm running brand new ntk sensors. Injectors are index 12 and brand new. The issue I see which I never had with the twins is that bank 1 lamda sensor is jumpy and not flat. Bank 2 is similar but not nearly as bad. Anyone have any ideas? Maybe ignition related?

 

langsbr

Captain
Apr 5, 2017
1,108
For convenience
 

iminhell1

Sergeant
Jun 17, 2018
291
Lean spool is active, spool mode in general
LPFP is varying too much IMO


It's a base tune. Talk to V8Bait and he'll make adjustments as to what he see's. It's not our place to step on his toes.
 
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Bmxr152

Specialist
Jul 13, 2019
50
Lake tahoe
Yeah I messaged him about it, I was just trying to see if it was something with the install or ntk sensors. Just waiting for a reply from him. I saw the lpfp jumping around, just confused as to what was causing that.
 

iminhell1

Sergeant
Jun 17, 2018
291
Yeah I messaged him about it, I was just trying to see if it was something with the install or ntk sensors. Just waiting for a reply from him. I saw the lpfp jumping around, just confused as to what was causing that.

Not enough LPFP. Controller maxing out and dropping. Generally it's a supply issue.
 

WOT808

Specialist
Aug 7, 2017
76
So I have the speedtech kit installed and a basic tune from v8bait to get me going. I'm running brand new ntk sensors. Injectors are index 12 and brand new. The issue I see which I never had with the twins is that bank 1 lamda sensor is jumpy and not flat. Bank 2 is similar but not nearly as bad. Anyone have any ideas? Maybe ignition related?


I have a SpeedTech Kit. Bank 1 AFR behaves similar to yours (spikey). I've used 3 different OE o2s and a set of new index 12 Injectors with the same results.
I've witnessed the behavior with my PI off.
Not sure of the exact verbiage but the SpeedTech install manual warns us about spikey AFR readings even after the o2 tables are changed in the tune.
Recently ordered ADV sensors after conversations with Jeff. I'll give this thread an update once the ADVs are installed.
 

JimboFresh206

Sergeant
Jan 29, 2018
289
I would definitely go with the ADVs, but find the appropriate connecter instead of splicing them. Kind of hard to see but they are right there by the Mac valve.

Once it warms up a bit I'll go out and get the PN.

Also make sure there isn't any coating where the 02s crush washer seats to ensure a good ground :)
 

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Bmxr152

Specialist
Jul 13, 2019
50
Lake tahoe
Okay, I was hoping the ntk sensors would be fine after all the praise I've been reading about them. Maybe something to do with the speedtech design? I probly should grind off some of the ceramic coating on the crush surface however.
 

iminhell1

Sergeant
Jun 17, 2018
291
I didn't go ADV because I'd found mixed reviews, more bad than good in recent time.
I got Tony's spacers if need be. Too much heat is the killer far as i understood.
 

JimboFresh206

Sergeant
Jan 29, 2018
289
the VTT heatsinks dont fit the Speedtech manifold. that was my original game plan. The tip of the heat-sink/spacer interferes with the manifold so they wont thread all the way down.

Im at 15k with zero issues on my ADV's from Jeff, and tuned by Jake.H at Motiv. Alot of the issues people ahve are due to the splices.

The 02s readings are based on resistance, solder adds that.. use the correct terminal's/plug housings and be happy like me :)
 
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Bmxr152

Specialist
Jul 13, 2019
50
Lake tahoe
Yesterday I tried swapping coils around and installing new plugs gapped @ .020. I made sure there was no ceramic coating on the o2 sensor mating surface as well. Nothing changed the readings. I was told by Jeff at speedtech that it is caused by not having the ADV sensors, i have also been told by the tuner that it is caused by missfires. Maybe a carbon buildup issue on valves, i know i need to clean them just been too busy working on customer cars. lol
 

Bmxr152

Specialist
Jul 13, 2019
50
Lake tahoe
I don't really see what the issue is in the log? Don't waste your money on the ADV sensors....been there, done that on 2 different cars, they are trash.
Thats what i figured. I've heard more horror stories with the ADV sensors than success stories. If you zoom in on lambda 1 and 2 you can see that 1 is like a saw tooth going from 11.2 to 12.5 where bank 2 is flat. Before the speedtech install with my Chineseium turbos i never had this issue.
 

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