Custom OS??

[HartRod]

I'm Trying to decide if I should switch to a custom OS (LS3/6L80/TVS1900/SD80 injectors). What are the advantages? Disadvantages? How do you flash them into the PCM? Thanks in advance.

[seven ends]

Here is a link to the Demos.....once there scroll down to "applying a 2 bar SD....." I did it years ago on another vehicle that I had and there was a 2 bar available. Free is great now but unfortunately none available for the one I have now. Big advantage is to simplify the MAP sensor tuning by having a user friendly VE table in HPT itself. IMO disadvantages that come to mind include sometimes limited or no availability of what you need and hit/miss on being able to use MAF too depending on application.

http://www.hptuners.com/forum/showth...ighlight=demos

[HartRod]

Here is a link to the Demos.....once there scroll down to "applying a 2 bar SD....." I did it years ago on another vehicle that I had and there was a 2 bar available. Free is great now but unfortunately none available for the one I have now. Big advantage is to simplify the MAP sensor tuning by having a user friendly VE table in HPT itself. IMO disadvantages that come to mind include sometimes limited or no availability of what you need and hit/miss on being able to use MAF too depending on application.

http://www.hptuners.com/forum/showth...ighlight=demos

Seven ends - thanks for the link. Doesn't the custom OS also allow you to have more fan settings than a factory GEN IV?

[seven ends]

I didn't on my Gen III when I was using a few years ago or at least I don't recall anything different in the fan settings (and I changed them for a 160 thermostat). Its not available for my Gen IV application so unchartered territory I can only dream about.

[realcanuk]

Seven ends - thanks for the link. Doesn't the custom OS also allow you to have more fan settings than a factory GEN IV?

It does extend the fan settings so that you can turn them on sooner. You can see all the features here..


https://www.hptuners.com/help/vcm_ed...ters_gm_os.htm

[10_SS]

Instead of Fan control starting at 192F, it's lowered to 163F. This way if you run anything cooler than the stock thermostat, you can have the fans on OR off below 192F... not just ON all the time for anything below 192F.

Just having a normal VE table is worth paying for like I did... but the are free now.

I have the 2bar setup, but I'm still running pure MAF 2yrs later but the VE tables are setup... just not in use. Prob a bit pointless but the E38 in my 2010 LS3 doesn't run great in pure SD mode (get lots of false burst knock and other things).

Plus I did since I knew I would actually need it one day and would rather get the bugs out before that day.

fans.PNG

[HartRod]

I didn't on my Gen III when I was using a few years ago or at least I don't recall anything different in the fan settings (and I changed them for a 160 thermostat). Its not available for my Gen IV application so unchartered territory I can only dream about.

It does extend the fan settings so that you can turn them on sooner. You can see all the features here..


https://www.hptuners.com/help/vcm_ed...ters_gm_os.htm

Instead of Fan control starting at 192F, it's lowered to 163F. This way if you run anything cooler than the stock thermostat, you can have the fans on OR off below 192F... not just ON all the time for anything below 192F.

Just having a normal VE table is worth paying for like I did... but the are free now.

I have the 2bar setup, but I'm still running pure MAF 2yrs later but the VE tables are setup... just not in use. Prob a bit pointless but the E38 in my 2010 LS3 doesn't run great in pure SD mode (get lots of false burst knock and other things).

Plus I did since I knew I would actually need it one day and would rather get the bugs out before that day.

fans.PNG

Thanks for all the info guys. Unless I am missing something, it seems like a no brainer to switch to the custom OS. Building the new VE tables seems like the biggest obstacle to overcome. Can the Bluecat tool help with this? Does the custom OS have any special features for the 6L80? TIA.

[Iam Broke]

I built a VE table using the Bluecat tool from a boosted LSA virtual VE as a starting point. Just needed numbers to put in and the LS3 table got wonky when converted for boost.

A generous soul gave me a Maggie VE table he created for an LS3. I run MAF above 800 rpm so it's fine.

Someday I'll disable the MAF and dial it in when time allows.

M6 here so never looked at the trans tables.

[HartRod]

I built a VE table using the Bluecat tool from a boosted LSA virtual VE as a starting point. Just needed numbers to put in and the LS3 table got wonky when converted for boost.

A generous soul gave me a Maggie VE table he created for an LS3. I run MAF above 800 rpm so it's fine.

Someday I'll disable the MAF and dial it in when time allows.

M6 here so never looked at the trans tables.

Thanks for the info. I need to finish a few more things on my swap and then I'll work on this. Another question,what thermostat are you guys running? What did you change your fan settings to?

[Iam Broke]

Running a 160* stat, most days see 174 cruising. Fans below. Everyone has an opinion but here's my table.


fans.jpg

[HartRod]

Ok guys, I finally found some free time to convert to the Custom OS. After I did the conversion, I did a compare with my old file and it only showed the 2 parameters had changed, both my offset values for my 3 bar MAP sensor. It also added the lower scale for the fan settings. Is it as simple as doing a "write all" and I'm done, or is there something I'm missing? Thanks,

Rob

[10_SS]

Did you have a virtual VE table, and now you have a real VE table that has 0's in it? If so you need to populate it.

[HartRod]

Did you have a virtual VE table, and now you have a real VE table that has 0's in it? If so you need to populate it.

After digging into it more, you are correct, there are two real VE tables with 0's in it. How do I populate it? Do I use Bluecat's tool?

[HartRod]

Here's a copy of my original tune and my custom OS one with the VE table generated by the BlueCat tool. Let me know what you think or if I got close.

[10_SS]

The values are in the right range... I have a stock pump with MSD Boost a pump and I lose fuel pressure as boost increases, so that likely causes part of my curve over 120kpa to show false readings to compensate for the loss of pressure.

You shouldn't need the VE table to be dialed in perfect or even close to perfect to run ok if your in MAF mode... but you do want to spend some time and try to dial it in since some people say it helps with Transients, etc. I personally never noticed an improvement from optimizing the VE table. Mine wouldn't even start when the VE's were all 0's. Also keep in mind whenever you make a change to one of the VE tables dont forget to copy to the others since I noticed mine tends to read data from the "Normal IMRC OPEN" table. A few times I forgot to copy to all tables and messed me up... so now I start with the "OPEN" table incase I forget to copy over to the others.

[HartRod]

Thanks 10_SS. My MAF was pretty well dialed in prior to use the Bluecat tool. So I'm guessing it should still be dialed in? Also, a novice question, but I just want to make sure. I have a boost referenced FPR. Should I set the base pressure of 58 psi with the vacuum line off and then plug it back in?

[10_SS]

If you had "Dynamic Airflow" disabled (set High RPM Disable to 800rpm, and High RPM Re-enable to 700rpm or so) when you tuned your MAF, and it's still disabled, then yes, your MAF tune should still be accurate. With OEM tunes the MAF and VE tables work together below certain RPM's from factory, mine was set to 4000rpm... beyond that it's pure MAF from factory. Right now, mine is pure MAF above 800rpm using the settings for Dynamic Airflow.

Regarding the FPR, not really sure since all my fuel systems have been stock with exception to larger pumps and injectors... I think that is the correct way to do it though. I plan to work on my own fuel system over the winter... maybe..

[MikeOD]

Thanks 10_SS. My MAF was pretty well dialed in prior to use the Bluecat tool. So I'm guessing it should still be dialed in? Also, a novice question, but I just want to make sure. I have a boost referenced FPR. Should I set the base pressure of 58 psi with the vacuum line off and then plug it back in?

Yes, you should pick a fuel pressure, and set it with the vacuum line off of the regulator. You should then go to your injector data and take all the data specific to that pressure, and use it across the board...so if your injectors flow 80 lbs/hour at 58 PSI, you should put 80 in every cell of that table. Do the same for the offsets table...pick the pressure column from the data that matches your pressure, and put it in every column.

[HartRod]

If you had "Dynamic Airflow" disabled (set High RPM Disable to 800rpm, and High RPM Re-enable to 700rpm or so) when you tuned your MAF, and it's still disabled, then yes, your MAF tune should still be accurate. With OEM tunes the MAF and VE tables work together below certain RPM's from factory, mine was set to 4000rpm... beyond that it's pure MAF from factory. Right now, mine is pure MAF above 800rpm using the settings for Dynamic Airflow.

Regarding the FPR, not really sure since all my fuel systems have been stock with exception to larger pumps and injectors... I think that is the correct way to do it though. I plan to work on my own fuel system over the winter... maybe..

Thanks for the info 10_SS.

Yes, you should pick a fuel pressure, and set it with the vacuum line off of the regulator. You should then go to your injector data and take all the data specific to that pressure, and use it across the board...so if your injectors flow 80 lbs/hour at 58 PSI, you should put 80 in every cell of that table. Do the same for the offsets table...pick the pressure column from the data that matches your pressure, and put it in every column.

Thanks Mike. They are SD80's rated at 80 lbs/hr at 43 psi. I used the GB data to set the IFR in the tables. I set everything up for use with the 1:1 FPR, unfortunately I just set the base pressure incorrectly on the FPR. I guess that would explain my lower than expected fuel mileage....rookie mistake..... Live and learn, now I get to go back and start over..... I guess this would be a good time to start playing with the custom OS. Since the VE tables are in the custom OS, would I use the same procedures for tuning the GEN III engines? TIA.