Trying to use Truck E38 w/ LS3 -- Throttle body settings?
06-15-2019, 03:02 PM
#1
Trying to use Truck E38 w/ LS3 -- Throttle body settings? I'm trying to use an E38 ECU/TCM from a 2008 Yukon XL LY6 to power up a 2010 LS3.
Should I copy over all "Electronic Throttle" settings from an LS3 Tune to my ECU?
If so, I'm hitting a weird issue.. On "Desired Throttle Area" my 'Axis Type' was set to VSS. No LS3 tunes I see had this set, as they were all set to RPM instead of VSS.
Even if I change it to RPM, if I open up the "Map A - Normal" charts, I believe the axis is still using VSS units on the column.. as they are like "0..5..10.." etc. Where the LS3 tune has actual RPMs
Tune attached. Also, I can't find any LS3 tunes running my OS of 12608677.. Edit: When I google this OS, I see it is from 2007... Is this even possible or did I shoot myself in the foot using this ECU?
Thanks!
Should I copy over all "Electronic Throttle" settings from an LS3 Tune to my ECU?
If so, I'm hitting a weird issue.. On "Desired Throttle Area" my 'Axis Type' was set to VSS. No LS3 tunes I see had this set, as they were all set to RPM instead of VSS.
Even if I change it to RPM, if I open up the "Map A - Normal" charts, I believe the axis is still using VSS units on the column.. as they are like "0..5..10.." etc. Where the LS3 tune has actual RPMs
Tune attached. Also, I can't find any LS3 tunes running my OS of 12608677.. Edit: When I google this OS, I see it is from 2007... Is this even possible or did I shoot myself in the foot using this ECU?
Thanks!
06-17-2019, 07:01 AM
#2
Guess no one knows? I kept the stock values in the electronic throttle tables - that were from the 08 Yukon throttle body. It starts and drives ok, but when you initially start it the idle dips real low but then bounces to normal. Not sure if the throttle body tables are to blame or not
06-17-2019, 12:38 PM
#3
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If the throttle is working, then it seems like your throttle tables are fine. I would venture to guess the startup dip you mentioned is either crank fueling, crank throt pos, or startup decay.
06-18-2019, 12:07 AM
#4
TECH Fanatic
The tune file you posted looks a lot more like an L99 instead of an LS3. Only say this because it has DOD enabled, VVT, and the VVE table has all the settings applied for different conditions. If that LS3 you have has these features then rock on, but normally that is the huge difference between the two, and what makes one an LS3 and the other an L99.
Here is a stock tune file from a 2014 Camaro SS with an LS3, manual trans. The autos came with the L99 and all that DOD stuff and VVT. The manuals have the true LS3 with none of that. You can see some of the differences in the tune file here. I will add though, keep in mind this file is for manual cars, so some of the airflow and so forth is going to be set lower and so on, particularly the Base Running Airflow table as one example.
Here is a stock tune file from a 2014 Camaro SS with an LS3, manual trans. The autos came with the L99 and all that DOD stuff and VVT. The manuals have the true LS3 with none of that. You can see some of the differences in the tune file here. I will add though, keep in mind this file is for manual cars, so some of the airflow and so forth is going to be set lower and so on, particularly the Base Running Airflow table as one example.
Last edited by ChopperDoc; 06-18-2019 at 12:22 AM.
06-18-2019, 12:20 AM
#5
TECH Fanatic
In your file it does have the VVT disabled, but DOD is still on, and if you look at the VVE on the different tunes, you'll see the one I posted has no changes other than manifold switch open and closed. Cam angle is not applicable either so you will see playing with the numbers on that one changes nothing. On yours it indeed changes and seems like it came from an L99 and not LS3 like I said. And 2007 is possible, as that's when all of this stuff started, same year the LS3 came out.. ish
06-19-2019, 07:58 AM
#6
The tune file you posted looks a lot more like an L99 instead of an LS3. Only say this because it has DOD enabled, VVT, and the VVE table has all the settings applied for different conditions. If that LS3 you have has these features then rock on, but normally that is the huge difference between the two, and what makes one an LS3 and the other an L99.
Here is a stock tune file from a 2014 Camaro SS with an LS3, manual trans. The autos came with the L99 and all that DOD stuff and VVT. The manuals have the true LS3 with none of that. You can see some of the differences in the tune file here. I will add though, keep in mind this file is for manual cars, so some of the airflow and so forth is going to be set lower and so on, particularly the Base Running Airflow table as one example.
Here is a stock tune file from a 2014 Camaro SS with an LS3, manual trans. The autos came with the L99 and all that DOD stuff and VVT. The manuals have the true LS3 with none of that. You can see some of the differences in the tune file here. I will add though, keep in mind this file is for manual cars, so some of the airflow and so forth is going to be set lower and so on, particularly the Base Running Airflow table as one example.
06-19-2019, 08:32 PM
#7
In your file it does have the VVT disabled, but DOD is still on, and if you look at the VVE on the different tunes, you'll see the one I posted has no changes other than manifold switch open and closed. Cam angle is not applicable either so you will see playing with the numbers on that one changes nothing. On yours it indeed changes and seems like it came from an L99 and not LS3 like I said. And 2007 is possible, as that's when all of this stuff started, same year the LS3 came out.. ish
Also, something also that is weird on this LS3 tune is the injector flow rate vs pressure is set to the same # across all pressure values, like as if it was a vacuum referenced regulator. Weird. I definitely need to change that
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06-22-2019, 02:05 PM
#9
TECH Fanatic
^^^ Yes he is correct. Sorry for not responding sooner. Yeah all you have to do is set the drop down to disabled and set the cam to none. Your cam is already set that way but when I looked at it DOD was on. Might cause issues, might not. Computers can be weird like that sometimes. I'll bet most of it is in the other tables though.
06-22-2019, 02:08 PM
#10
TECH Fanatic
I was simply saying that your tune looks like it came from an L99, that's all. The settings in the file I posted should help you sort it out. That's where I would start anyway. When you start messing with coefficients, and MAP areas and definitions, things get tricky and math-ie... LOL. Best just try some of those stock settings from a true LS3 file.
