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2008 GMC Envoy Denali

Will L.

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Old mechanical diesel is a faithful dog or horse. It does what you tell it, when you tell it, without question- even to it’s own demise. Do I make it sound like I hate electrical, electronics, programming, and the like? Yeah? Good.

Here is a vfd I just a bit before I finished installing yesterday that is temporary to use while I replace 7 others permanently later this year. I am not writing the programming, but my bosses boss decided I am learning right now also. Hooray for plc function blocks. Haha

Nate my friend- you are nuts for doing this by choice.9048A330-B380-4E1F-8E52-9BF4DC410069.jpeg
 

Husker6.5

135' diagonal 16:9HD, 25KW sound!
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I feel for you, @Will L. ! I used to have to program/reprogram PLC's at my job as a maintenance tech at an organic cereal plant (we made Kashi and other Organic Certified cereals like Uncle Sam's on subcontract for major brands as one of only four Certified Organic cereal plants in the U.S. at the time back in 2008. We had crazy regulations for cleanliness, materials, etc. Like we couldn't touch food contact surfaces while working (yeah, right) and if we did we had to completely disinfect them after working on the equipment. Pretty much everything in the plant was made of stainless steel, so I learned how to weld both sheet and structural stainless (like angle iron) among other things. How about all bearings on shafts, slides were greased with a special edible-rated grease - as were drive chains with an edible-rated lubricating oil - but you don't dare eat the stuff, it was just rated to be used around food processing surfaces.
 

Husker6.5

135' diagonal 16:9HD, 25KW sound!
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And of course VFD's were used to control 3-phase motors throughout the plant for every kind of conceivable drive or conveyor belt system. They would burn out either from cereal dust build up on the cooling fins on the heat sinks on the back of the VFD for the SCR's, or because during wash down after finishing the job the $11/hr production workers didn't bother to properly bag/waterproof the VFD's and got water in them - which definitely didn't mix with the 277 or 480 voltage put to them when powered back up.

We would just toss and replace with a new/good used unit when one burned out, instead of trying to repair it. This was my supply of serious heat sinks to use with remote mounting PMDs/FSDs - far better than any aftermarket FSD coolers commercially sold by any vendor I've seen for heat soak and heat dispersion.
 

n8in8or

I never met a project I didn’t like
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As of now I have called the tune “good enough”, I have gotten rid of the over-rich condition the new injectors gave me while not going too lean. I need to get back to work on the dually so it made sense to stop for now. Next month I’ll start again. I have found out that the way I was doing the MAF and VVE tuning is apparently antiquated and there is a better way of doing it, so I will give that a try and then once I have that optimized I will start working on tuning the spark. Even so, I am seeing improvements in miles per gallon (along with smiles per gallon). This afternoon we drove an hour away to an antique store. I reset the mileage before hitting the highway. I had the cruise set at 79mph, but I did have to slow down a couple times due to stupid traffic on I94. This is my mileage just before getting off the highway.

46458682-FE1D-4E63-A468-6E72B9C21DF4.jpeg

And this is what it was after the 55mph roads to get the rest of the way there, which included some stops and starts.

4C002410-F4EF-4B22-A3A9-FF4D0D2DE7A8.jpeg

Then on the way home, we took mostly back roads to avoid I94 around rush hour, so this was mostly 55mph, but quite a few stops and starts.

292BFEDD-5639-449C-A2AB-8688AA1217E4.jpeg

Of course JUST before I took that picture it was reading 20.2, ha. I never would have thought that I’d gain that much fuel mileage from a tune. The best I got before was 16.2 with the cruise set at 76mph, and that was when it still had 3.42 gears. I’ll take it, now I need to take it to the drag strip and see what kind of a 1/4 mile it will run. Then it will get an exhaust and probably a better set of cylinder heads and then it should really haul.
 

smokymtn65

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Your so far ahead of me, I did pull my first read off a 0411 I have to swap into my 98 with LS Droid. I have to get a 8.1 bin file to flash to it next. Let the learning begin. Of course get exhaust on it too.
 

n8in8or

I never met a project I didn’t like
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Your so far ahead of me, I did pull my first read off a 0411 I have to swap into my 98 with LS Droid. I have to get a 8.1 bin file to flash to it next. Let the learning begin. Of course get exhaust on it too.
Sounds interesting. I hope you include that in your build thread. FYI, I saw that you can tune a 98 7.4 on HP Tuners, or is there another advantage for swapping to the 0411?
 

THEFERMANATOR

FRANKENBURBAN
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Sounds interesting. I hope you include that in your build thread. FYI, I saw that you can tune a 98 7.4 on HP Tuners, or is there another advantage for swapping to the 0411?
Want to? LOL Actually more tune-ability more spark tables A lot more adjustment if I understand correctly.
The 98-00 black box is a PITA to tune to begin with. Very few tables to work with since it is only a 256kb memory chip vs the 0411's 512(double the memory). And the 0411 can be tuned for under $40. I bought my SX cable for $20 on sale through Amazon and can tune it for FREE using pcmhammer and tunerpro.

And do not use an 8.1l file. They used a 24/1x ignition pickup with CNP ignition, your 98 454 uses a 4/1x pickup and a distributor ignition. Make sure to use the 02 express van file from a 5.7l, correct the injector size data, and put in a 454 VE and spark table. Or use the VE & spark tables from the 8.1l as a starting point, but use the express van tune. You also need the express van tune so your fuel gauge will work as 98 is PCM controlled. You also have to make sure and use the correct maf settings. 8.1l has an 85mm maf, your 98 454 has a 75mm maf.
 

MrMarty51

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Miles City, Montana
The 98-00 black box is a PITA to tune to begin with. Very few tables to work with since it is only a 256kb memory chip vs the 0411's 512(double the memory). And the 0411 can be tuned for under $40. I bought my SX cable for $20 on sale through Amazon and can tune it for FREE using pcmhammer and tunerpro.

And do not use an 8.1l file. They used a 24/1x ignition pickup with CNP ignition, your 98 454 uses a 4/1x pickup and a distributor ignition. Make sure to use the 02 express van file from a 5.7l, correct the injector size data, and put in a 454 VE and spark table. Or use the VE & spark tables from the 8.1l as a starting point, but use the express van tune. You also need the express van tune so your fuel gauge will work as 98 is PCM controlled. You also have to make sure and use the correct maf settings. 8.1l has an 85mm maf, your 98 454 has a 75mm maf.
That just stuns Me every time You post. The information thats in Your head is totally amazing to Me.
I love this stuff but I dont understand a bit of it. 😵💫😹😹😹😹
 

smokymtn65

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The 98-00 black box is a PITA to tune to begin with. Very few tables to work with since it is only a 256kb memory chip vs the 0411's 512(double the memory). And the 0411 can be tuned for under $40. I bought my SX cable for $20 on sale through Amazon and can tune it for FREE using pcmhammer and tunerpro.

And do not use an 8.1l file. They used a 24/1x ignition pickup with CNP ignition, your 98 454 uses a 4/1x pickup and a distributor ignition. Make sure to use the 02 express van file from a 5.7l, correct the injector size data, and put in a 454 VE and spark table. Or use the VE & spark tables from the 8.1l as a starting point, but use the express van tune. You also need the express van tune so your fuel gauge will work as 98 is PCM controlled. You also have to make sure and use the correct maf settings. 8.1l has an 85mm maf, your 98 454 has a 75mm maf.
Thanks @THEFERMANATOR
 

THEFERMANATOR

FRANKENBURBAN
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