Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
SVTPerformance's Chain of Restaurants
Tuning À la carte
Could someone take a look at my log?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="WaffleMan" data-source="post: 15994704" data-attributes="member: 147774"><p>I am no tuner, I only tune my own car so take this for what its worth.</p><p><u></u></p><p><u>STFT</u> - Short Term Fuel Trim</p><p><u>Closed loop</u> - car is making fueling corrections and going off of the O2 sensors. STFT of 1.0 is stoich, 14.7:1 AFR on pump gas or 14.1:1 on e10. >1.0 means car is having to pull fuel to get to commanded value, <1.0 means it's having to add fuel.</p><p><u>Open loop</u> - car is ignoring O2 sensors and strictly going off the commanded value in the tune, using the maf transfer function. You know if you are in Open Loop when STFT 1&2 are stuck at the same value and not fluctuating. </p><p></p><p>There is a area in the log where it looks like you slowly roll into the throttle, from time 8.5sec to 12.1sec, where the car stays in closed loop. If you look at the short term fuel trims they start to deviate from 1.0 lambda starting at 600maf cts and are 1.16 lambda on bank 1 and 1.09 on bank 2 by 941 maf counts. This is saying the car is having to pull fuel to get to the commanded value, in other words the maf transfer function is off from 600+ maf counts. </p><p></p><p>So when you go WOT and the car goes into open loop, .82 lambda is being commanded, which is 12.0:1 AFR. But since you are 10-15% rich up top you are in the 10s AFR. Hope this makes sense and is of some help.</p><p></p><p>Rest of the log looks good, I don't see an inconsistent maf signal and fuel delivery looks fine.</p></blockquote><p></p>
[QUOTE="WaffleMan, post: 15994704, member: 147774"] I am no tuner, I only tune my own car so take this for what its worth. [U] STFT[/U] - Short Term Fuel Trim [U]Closed loop[/U] - car is making fueling corrections and going off of the O2 sensors. STFT of 1.0 is stoich, 14.7:1 AFR on pump gas or 14.1:1 on e10. >1.0 means car is having to pull fuel to get to commanded value, <1.0 means it's having to add fuel. [U]Open loop[/U] - car is ignoring O2 sensors and strictly going off the commanded value in the tune, using the maf transfer function. You know if you are in Open Loop when STFT 1&2 are stuck at the same value and not fluctuating. There is a area in the log where it looks like you slowly roll into the throttle, from time 8.5sec to 12.1sec, where the car stays in closed loop. If you look at the short term fuel trims they start to deviate from 1.0 lambda starting at 600maf cts and are 1.16 lambda on bank 1 and 1.09 on bank 2 by 941 maf counts. This is saying the car is having to pull fuel to get to the commanded value, in other words the maf transfer function is off from 600+ maf counts. So when you go WOT and the car goes into open loop, .82 lambda is being commanded, which is 12.0:1 AFR. But since you are 10-15% rich up top you are in the 10s AFR. Hope this makes sense and is of some help. Rest of the log looks good, I don't see an inconsistent maf signal and fuel delivery looks fine. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
SVTPerformance's Chain of Restaurants
Tuning À la carte
Could someone take a look at my log?
Top