Tweecer crash course

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

yamahaSHO

E85 whore
Joined
Jul 25, 2002
Messages
10,646
Reaction score
2,516
Location
Arkansas
How long has your computer been on this tune (after cleared memory) when you got this screenshot? It looks like the car is just starting to correct for a lean condition.

I can't do anything with the data log as I am using my iPhone. Will look later.
 

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
umm probably months

Is it just me or his TP all over the place?

It is all over the place. i figured it just wasnt reading correctly.
 
Last edited:

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
It never gets higher or lower than 1.0-1.3

it goes back to exactly 1.0 a few times. I was trying to watch if the pause in kamrf change correlates with open/closed loop but it doesnt really seem to.

btw thanks for the help guys, im still reading my ford tuning book but havent gotten into kamrf values. ive been studying open/closed loop mostly.


edit:
<--- still on iPhone.
i know but marcel asked, and for you later.
 
Last edited:

yamahaSHO

E85 whore
Joined
Jul 25, 2002
Messages
10,646
Reaction score
2,516
Location
Arkansas
It never gets higher or lower than 1.0-1.3

it goes back to exactly 1.0 a few times. I was trying to watch if the pause in kamrf change correlates with open/closed loop but it doesnt really seem to.

Don't reference it to OL/CL. Reference it to pulse width. With what you posted with your numbers, you need to lower your low slope.

btw thanks for the help guys, im still reading my ford tuning book but havent gotten into kamrf values. ive been studying open/closed loop mostly.

KAMRF is one of the BIGGEST things you need to concern yourself with. Essentially, if this is centered around one <2-3%, you'll be "tuned". This value will change over time, however, you can get a general idea within a very short amount of time. The further your AFR tune is off, the quicker it will start changing after you start a new tune and (ALWAYS) clear the computer (EVERY time you load a new tune).
 

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
i have gotten these codes within the last 2 weeks.
136 (R) Oxygen sensor not switching/system lean Left or Front HO2S - Fuel control
176 (M) Oxygen sensor not switching - system is or was lean Left or Front HO22SSS - Fuel control



Edit: slopes were 27h and 72l
They were the stock numbers from josh's site
 
Last edited:

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
when i got that code i replaced the front with a known good working sensor and got no change in codes or idle.


Edit: i just looked up an old tune and both slopes are at 24?
 

yamahaSHO

E85 whore
Joined
Jul 25, 2002
Messages
10,646
Reaction score
2,516
Location
Arkansas
Both slopes are at 24? Have you adjusted the injector offset? What size injectors are you using?
 
Last edited:

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
i had both slopes at 24 in an old tune and i had no wideband then. i havent touched the injector offset. stock 3.2 injectors.
 

yamahaSHO

E85 whore
Joined
Jul 25, 2002
Messages
10,646
Reaction score
2,516
Location
Arkansas
Why did you change it from a stock injector slope so drastically with stock injectors and no WBO2?

The stock LS is around 27 and HS is around 72. If you want to bring them both around 24, you'll have to start messing with injectors offset. With such a small injector, I would change the stock setting very much at all.
 
Last edited:

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
i didnt do that myself lol. i have never messed with the slopes. i dont know why it was like that.

they arent like that anymore anyways. so we can move foreward.

btw your backwards, low is 72 and high is 27. i posted that above.
 
Last edited:

yamahaSHO

E85 whore
Joined
Jul 25, 2002
Messages
10,646
Reaction score
2,516
Location
Arkansas
Yes, that's what I meant (sorry, multi-tasking at the moment).

The KAMRF values that tell you whether or not you're hitting your target AFR values. 1 means that you're hitting your target AFR. Anything above 1 is showing that it is correcting for a lean condition and below 1 is showing that it is correcting for a rich condition. With that said, reseting the ECU resets the value to 1. Because it resets it to 1 across the board, you'll need to give it some time to learn new values.

When trying to figure out whether or not to adjust the low or high slope, you'll reference the KAMRF value to the the Injector Pulse Width. Roughly 2ms and below will point to the low slope and above is the high slope. You can use the Breakpoint to adjust where the crossover is, however, this is generally adjusted at a later point.

For the most part, you can tune with the stock Injector Offset (vs Battery Voltage). When you step to larger injectors (generally 44lbs/min or larger), you will find that you'll run out of room on the low slope as it maxes out around 110. To bring that value down, you'll lower the injector offset in the 11-15v range to essentially cause the injectors to react slower. You can use this to bring the Low Slope down close to the high slope value. You can work with this one stock injectors, howver, I would train yourself with the basics for now.

If you want to make sure you're safe while tuning, you can add some WOT Fuel Multiplier to the mix. I generally set this to 1 across the board so it does not add any extra fuel. When set below one, it will add fuel at that RPM (@ WOT) but will not account for it. When tuning a boosted car, you can add fuel via this table and slowly relieve it as you bring the injector slope into tune until you no longer have to use WOTFM.


EDIT 2: LAMBSE - This is your target AFR meaning it is the value the computer is currently shooting for. Ideally, if the car were perfectly tuned, you'd see these values match exactly what is in your commanded AFR table for any given load and RPM. As your KAMRF rises above 1 (correcting for lean condition), you'll see the LAMBSE shoot for a richer mixture than target AFR. On the other end, if you see KAMRF drop below 1 (correcting for rich condition), the LAMBSE will command a higher AFR in order to bring it into the range of the values you have set in your AFR tables. In the end, you want these to match your commanded values in CalEdit for a given load and RPM.



EDIT: I think I may, in the near future, sit down and write an article for tuning the SHO. I'll have to get my thoughts down on paper and have Josh and Adam add their thoughts to it as well.
 
Last edited:

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
Thankyou x1mil for that. i can do alot with just that information right there.
 

Sho Amo

SmkTyresntDrugs
Joined
Feb 23, 2006
Messages
3,299
Reaction score
856
Location
Olney, Md
This is what i have found today:
A) After switching my low slope all the way down to 62 it doesnt always idle at 16. I get and idle of 14.6 for about 5 seconds and then switch to 16 again.
B) When my WB says 16, my HEGOs are not switching, they are stuck in the red (0.0)
C)When my WB reads 16 my spark advance is jumping between 10 and 20. When it jumps back and forth you can literally feel it in the car as well as see it on the tach (jumps 600 too 700rpm)
D) I also noticed that as soon as it jumps to 16 on the WB the light for closed loop goes out and comes right back on




Let me know what you think
 

Forum statistics

Threads
107,084
Messages
1,181,281
Members
16,152
Latest member
Satchmoz

Members online

Back
Top