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LC1 setup (ground offset)
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,376
Likes: 4
From: Hershey, PA, USA
Cruise-In VI Veteran
St. Jude Donor '12
LC1 setup (ground offset)
Ok, I have my LC1 wired up correctly. Thats not the case this time.
When I am key on, not running, my Logworks reads 22.3-22.1 when sitting. My Hptuners reads 21.09-21.0, using the LC1 pid already setup.
I tried using the (volt/.625)=10 and setting my LC1 to read 0v = 10 and 5v = 18, but that just made it worse, HP would say 17.36 while LogWorks still read 22.3.
How do i fix this? I have the offset excel sheet that a member posted up that allows you to plug your actual volts compared to commanded volts.
But I do not know how to command the volts on the LC1. Do you use the Logworks? If so where is it at?
When I am key on, not running, my Logworks reads 22.3-22.1 when sitting. My Hptuners reads 21.09-21.0, using the LC1 pid already setup.
I tried using the (volt/.625)=10 and setting my LC1 to read 0v = 10 and 5v = 18, but that just made it worse, HP would say 17.36 while LogWorks still read 22.3.
How do i fix this? I have the offset excel sheet that a member posted up that allows you to plug your actual volts compared to commanded volts.
But I do not know how to command the volts on the LC1. Do you use the Logworks? If so where is it at?
Pro
Joined: Nov 2003
Posts: 503
Likes: 1
From: Greensboro NC
In closed loop with the engine running what does your logworks read? It should be 14.5 – 15.
Whenever I think HPTuners is reading wrong I always go back to closed loop before I start chasing the offset.
The HPTuners forum has a detailed post on offset.
Whenever I think HPTuners is reading wrong I always go back to closed loop before I start chasing the offset.
The HPTuners forum has a detailed post on offset.
Pro
Joined: Feb 2004
Posts: 718
Likes: 1
From: barrie ontario
Use the 10-18 afr range and 0-5v for your voltage range.
then go into logworks and set the output voltage to 2.97v.This is approx where 14.7 afr would be.
Go back to Hp tuners and set your pid to read voltage of the wideband instead of the calculated afr value.
You can then use the difference between the 2 values to adjust the reading so they will match.
IE : if your logworks is out putting 2.97 v and your Hp tuners is reading 3.1 v then you would subtract .2 v from the final value.
using the (volt/.625)=10 your formula would (volt/.625)=9.8
then go into logworks and set the output voltage to 2.97v.This is approx where 14.7 afr would be.
Go back to Hp tuners and set your pid to read voltage of the wideband instead of the calculated afr value.
You can then use the difference between the 2 values to adjust the reading so they will match.
IE : if your logworks is out putting 2.97 v and your Hp tuners is reading 3.1 v then you would subtract .2 v from the final value.
using the (volt/.625)=10 your formula would (volt/.625)=9.8
Le Mans Master
Joined: Nov 2003
Posts: 8,004
Likes: 250
From: Tampa Fl
St. Jude Donor '12-'13-'14
I PMd this to a guy on another forum and he found it helpful:
First make sure your LM1 is connected to your laptop with the USB/Serial cable, and you have downloaded the latest 3. 25 verision from innovation.
Make sure you click on the analog output 1 for air/fuel and not on lamba. add the offset Ill list below, then click on the program button. Then do the same for analog output 2, and click program.
The offset I use is:
[0.00] volts at AFR [10.0]
[4.996] volts at AFR [19.99]
Yes you are correct when you add 5 and 20, it will change it to 4.996 and 19.99
If those numbers dont get you that same reading on the HPT as the LM1, all you have to do is either add or subtract .25 to the numbers until its the same reading. The LM1 is the right AFR, and you are adjusting the output reading to get the HPT right
I hope that helps. I even tried to put a box around the numbers to help .
Phil
First make sure your LM1 is connected to your laptop with the USB/Serial cable, and you have downloaded the latest 3. 25 verision from innovation.
Make sure you click on the analog output 1 for air/fuel and not on lamba. add the offset Ill list below, then click on the program button. Then do the same for analog output 2, and click program.
The offset I use is:
[0.00] volts at AFR [10.0]
[4.996] volts at AFR [19.99]
Yes you are correct when you add 5 and 20, it will change it to 4.996 and 19.99
If those numbers dont get you that same reading on the HPT as the LM1, all you have to do is either add or subtract .25 to the numbers until its the same reading. The LM1 is the right AFR, and you are adjusting the output reading to get the HPT right
I hope that helps. I even tried to put a box around the numbers to help .
Phil
Thread Starter
Melting Slicks
Joined: Feb 2001
Posts: 3,376
Likes: 4
From: Hershey, PA, USA
Cruise-In VI Veteran
St. Jude Donor '12
I grounded my LC1 to the negative battery term & it fixed the problem.
Now my Logworks reads 20.9 and my HPtuners will read 21.01
Now my Logworks reads 20.9 and my HPtuners will read 21.01
Pro
Joined: Feb 2004
Posts: 718
Likes: 1
From: barrie ontario
Ground offsets are not linear so it could be way off near stoic.
Thats why i suggested checking the values at the point that is most crucial.
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Former Vendor
Joined: Jun 2009
Posts: 603
Likes: 0
From: Tampa FL
Here is the link to the Video and Wideband spreadsheet
. Downloadable manual will be up on Monday.
http://thetuningschool.com/Downloads/
Let me know what you guys think.
Ian
. Downloadable manual will be up on Monday.http://thetuningschool.com/Downloads/
Let me know what you guys think.
Ian
Former Vendor
Joined: Jun 2009
Posts: 603
Likes: 0
From: Tampa FL
Thanks for the kind words. Bob the owner of The Tuning School did a great job in making the video.
Our Learn at Home Courses also come with videos on different tuning proccess. Its great because you can see us on the dyno going through the process on the dyno in real time, showing you what to do in the editor and what to look for in the scanner.
Ian
Our Learn at Home Courses also come with videos on different tuning proccess. Its great because you can see us on the dyno going through the process on the dyno in real time, showing you what to do in the editor and what to look for in the scanner.
Ian
