Lamda issues after speedtech install

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Bmxr152

Private
Jul 13, 2019
40
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
1,027
For convenience
 

iminhell1

Corporal
Jun 17, 2018
228
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.
 

Bmxr152

Private
Jul 13, 2019
40
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

Corporal
Jun 17, 2018
228
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
66
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.
 
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JimboFresh206

Sergeant
Jan 29, 2018
278
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

Private
Jul 13, 2019
40
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

Corporal
Jun 17, 2018
228
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
278
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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