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Old 03-21-2021, 01:08 PM   #401
Gregski
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HP Tuners Tutorials - Top Tip Time

HP Tuners Top Tip # 47

If you were away from HP Tuners for a while like I was (looking at you COVID-19) and now you may be thinking of doing some more tinkering, you may find this tip useful.

Say the last time you tuned was six months ago or a year ago, and now you want to change something else. Well if you are like me then you may wonder where did you save that last file to? Is it on your office PC that you upgraded since, or on your laptop that you loaned to your daughter for school?

In that case the best thing to do is read the configuration from your PCM like we did in the very first tutorial, so simply refer to that and follow those steps, and I recommend you call it something like 000 - Baseline 03-21-2021 that way you will be certain you will pick up from where you left off, since sometimes your latest file may be something like 15 - Tried Something That Didn't Work and then you forget that you went back to 14 - Last Known Good Config

yes that has three leading 000 in it to signal a new series of tuning a new chapter if you will, but you do you
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Old 03-22-2021, 05:18 PM   #402
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Re: HP Tuners Tutorials

Glad to see you back adding to this thread!
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Old 03-25-2021, 01:46 PM   #403
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Re: HP Tuners Tutorials

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Originally Posted by MDPotter View Post
Glad to see you back adding to this thread!
Thanks mate, it was bugging me that I left it unfinished!
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Old 03-26-2021, 01:44 AM   #404
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HP Tuners Tutorials - Enable Power Enrichment aka Accelerator Pump / Secondaries

Part IX - Enable Power Enrichment aka Accelerator Pump / Secondaries

Let's take a look at some Channels that can help us gauge first if Power Enrichment is even coming on, and then how much it is effecting our Air Fuel Ratio and when.

To do this we need a minimum of three channels, so we'll start with those and then add some more for better context.

Throttle Position channel (so this is the throttle blade position on the nose of your engine, and not the actual throttle pedal, since some of us may still have drive by cable, meaning non electronic throttle pedal)

Equivalence Ratio Commanded channel (this is the adjustment that is being made to our Air Fuel Ratio, so since we are dealing with Power Enrichment it will always be the amount we are enriching) we can choose what units to show this in, either Lambda or AFR. If we choose lambda it will show the value of 1.0 until PE kicks in then it will drop below 1.0 to something like .85 to show a richer fuel mixture. In other words when we are just cruising the system says lets take our perfect AFR of 14.68 and multiply it by 1.0 and that doesn't change anything cause one times four apples is still four apples type of thing. Again the cool kids tune in Lambda but I can barely wrap my head around AFR. It doesn't matter which units you use as long as you're comparing apples to apples.

Air-Fuel Ratio Commanded channel (this is the actual final result after all the adjustments, this shows what Air Fuel Ratio we are running at this particular moment in time, if Power Enrichment never comes in then we strive for a perfect Stoich ratio of 14.68, which is a theoretical number that says 1 shot glass of pure(ish) gasoline requires approximately 14 and a half shot glasses of air to burn at it's best)
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Last edited by Gregski; 03-26-2021 at 12:19 PM.
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Old 03-26-2021, 01:50 AM   #405
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HP Tuners Tutorials - Enable Power Enrichment aka Accelerator Pump / Secondaries

Part IX - Enable Power Enrichment aka Accelerator Pump / Secondaries

Now to get a better perspective and to remember what it is that was happening when you go to review the log an hour later or a week later, I like to add a few more helper channels if you will

Engine RPM will tell us when we shifted gears

Vehicle Speed obviously tells us that we've tickled the skinny pedal

feel free to add what ever channels will help you out analyze things, just keep in mind the more channels you add the slower the data transfer may be as you log
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Old 03-26-2021, 01:59 AM   #406
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HP Tuners Tutorials - Enable Power Enrichment aka Accelerator Pump / Secondaries

Part IX - Enable Power Enrichment aka Accelerator Pump / Secondaries

So we could stare at the values in these channels in the left pane of our HP Tuners Scanner but things really paint a better picture when we add a Chart vs Time to our layout in the right hand pane.

So essentially the Channels are just a way of capturing the data we need and not having to bring in all the other noise, but we really analyze things on the right hand side of the Scanner screen.

Let's take a look at a couple Chart examples, this first one simply illustrates starting from the top, that we just shifted from 1st to 2nd (top RPM red line) the middle orange line shows us building up some speed, and the bottom green line shows how we were at Stoich AFR and then dipped into Power Enrichment and richened the air fuel mixture to 12.26 proving to us that Power Enrichment indeed kicked in.

You can start by adding these channels and creating these types of simple charts prior to making any Power Enrichment changes to your tune, and you will see that that bottom green line never dips for you, well unless you go nuts and hold your gas pedal down to the floor for a second above 5,000 RPM, not recommended, and not safe out on the road
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Last edited by Gregski; 03-26-2021 at 02:17 AM.
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Old 06-18-2021, 03:24 PM   #407
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Re: HP Tuners Tutorials

Gregski, Thank you so much for this! I have a 65 C10 SWB with a 5.3/A4 that I am almost ready to test the fuel system and fire up for the first time. I had my pcm wiped/prepped by a mail order guy. I took the time to copy/past and make a PDF with all of your steps so I can read offline. Rest assured I will be going through your steps to make sure everything in my PCM is right.
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Old 06-18-2021, 07:44 PM   #408
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Re: HP Tuners Tutorials

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Originally Posted by JamieGallien View Post
Gregski, Thank you so much for this! I have a 65 C10 SWB with a 5.3/A4 that I am almost ready to test the fuel system and fire up for the first time. I had my pcm wiped/prepped by a mail order guy. I took the time to copy/past and make a PDF with all of your steps so I can read offline. Rest assured I will be going through your steps to make sure everything in my PCM is right.
Awesome, use the compare feature I mentioned somewhere early on or reach out to me and we can text or IM if you have any questions, a lot of those tuner guys/gals are really good the problem is they don't have the access to your actual vehicle they can not go for a ride along with you with their laptop in their lap and log any data, that's where the magic happens
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Old 07-11-2021, 11:29 AM   #409
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Re: HP Tuners Tutorials

SOOO Glad I just found this thread! And Thank You for posting it! I just received my HP Tuners kit and have two trucks to use it on. 2014 5.3 6l80 Sierra SWB and my 72 Blazer 5.7 T56. The Blazer still needs a fuel system so I can tinker with my Sierra and disable the AFM DOD and maybe a set of headers and exhaust. I have not read all the posts here yet but am working on it. I am guessing I am going to need a few thumb drives...
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