I need some help tuning my 3800 SC. I'm new to HP Tuners and I'm used to using Tuner Studio. When looking through there are no tables just listed as what they are, like AFR, Timing, Boost, etc. I'm totally lost on where to even begin.
I need some help tuning my 3800 SC. I'm new to HP Tuners and I'm used to using Tuner Studio. When looking through there are no tables just listed as what they are, like AFR, Timing, Boost, etc. I'm totally lost on where to even begin.
Partly because tables like those don't exist in the OEM language.
In those computers the MAF airflow table controls the fueling. Then there are set tables that tell it what to command for fueling. Like the stoich table for regular driving will always stay the same because most fuels are always either E0 or E10. Then you have the EQ Ratio table in power enrichment, that tells the computer to command whatever value is in there when it enters power enrichment. There are also adder tables that can increase or decrease the commanded fueling PE.
Basically you tell it to command a specific AFR and then it's your job to alter the MAF curve to match the commanded. If it's lean or rich of the target, you add or remove fuel in the required area's.
There is no boost table. The size of the pulley and restrictions in the intake or exhaust will determine the boost. You can't tell it to only make 4lbs or 8lbs type of thing.
Timing is easy, there is a spark advance section with a high and low octane timing table.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
Thank you for your help.Originally Posted by 5FDP
This just keeps getting more confusing. My log file showed that LTFT was adding 15% more fuel so I raised the values in the affected Hz range by 15%. I took another ride and the same area said it was calling for 5% more fuel, so I adjusted the values by 5%. I did it again, this time it was adding 12.8% and I noticed it was doing this around the 170 - 185 degree ECT area. I reduced the AFR in that temp range in PE, and added the 12.8% in the MAF values. The next run it said it was adding 14.5%, so I added the 14.5% in the MAF table. Now it's saying it's adding 12.8% more fuel. I have raised the fuel % by about 47% plus lowered the AFR in PE at the affected range but it's still adding more fuel. Under WOT, my AFR gauge is reading around 9 -10 so I don't think it's an actual fueling problem. Is there a glitch, or something I'm missing that would cause this?
Post Tune & Log, Post Tune & Log, Post Tune & Log......................
Also we have no idea what your mods are.
You could also be fighting a issue you created if say the injector data is wrong or that you are running out of fuel pressure.
Also the LTFT don't work in PE, so if you have fuel trims that are off going into PE, it can often times carry the same LTFT value into PE. Full throttle PE stuff has to be done with the LTFT disable so it can't skew the data.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
I have a North Star TB and MAF, 42 lb/hr injectors, K&N style cold air kit,340 LPH fuel pump, Intense PCM, and 2.5 inch straight thru muffler.
Last edited by TURBOGNX; 06-04-2024 at 09:54 AM.
I get the feeling that if you don't have an LS, Mustang, or Import, then HPTuners is a waste of money.
Works fine on my Chevy Ecotec I4 LNF/E69. Just some of these will take more effort on your part to figure out. I think I read every post on the forum with LNF in it before I ever started tuning it. There is a price to pay when working on oddball stuff.
It's completely frustrating when there are literally about 20 people on any given day that could chime in and say, "This is the problem, you just have to change that", but they won't because it isn't an LS.
This is the 3rd forum where everyone said we have to know what your mods are and you have to post your tune and logs, and after I did.........complete silence.
Whether it's a 4 cylinder, V6, V8, or V12, all the tuning principles are the same it's just everyone has splintered into groups, and if you're not in one of those groups, you get no help.
I wasn't trying to say HPTuners can't be used to tune a 3800SC, just that it becomes worthless when there is no help to be found.
Tuning principles might be the same, but how the ECM's work can be different and people tend to specialize. It takes a lot more time to dig into an unknown ECM even for the experienced tuners. Even available PIDs can be different.
It totally sucks that HPTuners made this platform available, gave it only a few adjustment areas, then jumped ship, and said "sucks to be you". I notice too that on other platforms I see actual Techs from HPTuners commenting, but here in V6 world, it seems silent.
Not very much in the way of comments from HPT Techs in any of the GM forums. I don't know how they decide to weigh in on which forums. Maybe the GM guru just isn't the chatty type. Again, I have the E69 which is a very limited support ECM, so I understand what that is like. It just takes more effort on your part.
Unfortunately, I never got into trying to tune till lately. If I already had something well supported like an LS and had been tuning for years and learning how it works, then tried tuning an L32, I probably wouldn't even have to look for help. When it's the opposite, trying to learn on something that's not supported, it makes it almost impossible to learn. Even on the rare occasions I can find help, they start talking about changing different things that as usual, don't exist in HPTuners for an L32. I ran into this when I was told my MAP readings were all off and I needed to adjust it, but you guessed it, that didn't exist either.
Might be time to use a standalone aftermarket system if this is a swap vehicle.
I thought about switching over to Holley, but just the idea of wasting yet more time and money switching over to yet another system. I also thought of just switching over to a PCM from ZZPerfomance and then only making the minor changes to fuel or timing that might need tweaking. Right now, I have a PCM from Intense that was never set up right to begin with having the shift points well past redline, drowning it with fuel down low, way too lean up top with 9 degrees KR, the list goes on. It supposedly had lifetime tunes available but not much good when you can't get a hold of anyone. The one time I did get through to him for troubleshooting the problems, I was told all of this info was available online, and he doesn't have the time. I then switched over to getting all additional parts needed from ZZPerformance and bought HPTuners. Just one bad decision after another.
I'll help. Start me off with the part number on those 42lb injectors and what fuel pressure are you set at? Upgraded pump I see. Did you get a different FPR or is it stock?
Injectors are 12613412 and FP is set at 53 psi. It's an aftermarket fuel pressure regulator (vacuum reference) but I'm not sure of the brand.
Here's the setup with injector data. For it to be valid you need to set pressure to 58psi. Setting is done with the vacuum line disconnected in case you didn't know. Reconnect after it's set.
I bumped up MAF down low because it'll run leaner now with the correct settings. Keep RPM's below 3500 for now in order to get the curve close. Stay out of boost. Slow pedal movements.
After loading the tune use VCM Scanner>Vehicle Controls & Special functions to clear LTFT.
Last edited by SiriusC1024; 06-10-2024 at 10:16 PM.
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