My dyno ate its hard drive a few weeks ago. Today it got fixed and newer software....$890 dollars later. I got a little nostalgic looking at all the old graphs. The old tbi with vortec heads and the...

For heavy towing I would stay away from a 4l60, 65, 700r4, ect. Unless very light loads. You may not notice it, but there are much larger gear gaps in that transmission family than the 4l80e. 1st is...

The truck is gone. I sold it after I had the suburban for a month or two. I made quite a bit reselling it. Seems low mileage, big block grandpa trucks are in demand.

The van was a good one. The 4l60e was its down fall though. I built it heavy duty and it held up fine, just had bad gear ratios for towing. Since you are not supposed to use 4th towing and 2nd was...

Double post

I picked up the vans replacement yesterday. 1996 c2500 with 110,000 miles and 454/4l80e/4.10. It doesn't need much. Some shocks, hoses and all the fluids replaced/flushed. I spent a few hours today...

The project ended today, but in a good way. I learned a lot. I wanted to thank everyone for the input. I very much appreciate the guidance. A startup company decided they wanted delivery vehicle with...

In the factory open loop table, why is the af ratio set so lean? I am getting the closed loop tables dialed in, but noticed if I cold (80F) started the van at idle, It would run to 12.1 on the wide...

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Putting last years before and yesterdays after side by side shows gains. There is some differences in the tests so the results are...

Nice, I think if I ever explode the 109,000 mile engine that is in the van currently I will just find a 97 and later 454 suburban power train to swap in the van and still keep the rpms under 4000. I...

If you look at the pattern for the white primary coil wire, its not a square wave pattern. So the tach adapter for the dyno sort of works but cuts out at times when hooked to it. For dyno dynamics,...

I will check out rock auto after measuring the fan. Thank you for the tip.

I am being lazy. Its using roller tacho using a math ratio from rpm to roller speed. The real dyno dynamics tach adapter uses a square wave like an injector for rpm or the tach out put for a msd....

I upgraded the dyno fan this year. Its a big one so it keeps things reasonable. Still no match compared to the 10hp fans some people setup, but mine will still run on a 20a circuit. My fan clutch on...

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I messed around with putting the van on the dyno today. Pretty close to the same numbers six months later. If you want dynojet...

I do have 2nd gear to lock at about 85% or more. When it was getting hot it was in 3rd. So far the rebuilt 4l60e does fine durability wise. I hate the gear spread though, so I am half way looking for...

I gave the van a real towing test a few months ago. I got called to tow the dyno to a small town in middle Oregon. Only about 80 miles each way but its in old volcano areas. The highway is straight...

I think it should have made a much bigger difference than it did. My thinking is, maybe the data is mislabeled or misaddressed and we are not changing what we think we are changing? I will leave it...

So along yesterday's discussion, from the other thread where changing the o2 stoich from 14.7 to another number for E10...
I started my tune with the setting at 14.2. On the dyno months ago, I ran...

Fair enough, there is a LOT of contradictory information here. So care has to be taken. Even some of my post would probably mislead, so its a learning process. I tried to edit out the most confusing...

I am editing this so not to confuse anyone. Mostly I was just confusing myself by editing things with little explanation of how it works. It was a good lesson though and I didnt hurt anything.
The...

https://www.summitracing.com/parts/sum-174001/applications are the springs I am running. The cruddy import vortec heads Jegs sent had pathetic valve train. So I upgraded to be safe, not as strong as...

Edited this to save anyone from confusion. See below.

I might have found a little clue for why the numbers in the data logging do not match up with the data log. The od TP5 v251XDF supposedly compensates for initial advance changes. The adx does not,...

I hooked in AEM X-series wideband this weekend. I am attaching the modified adx incase someone wants to use the newer series of wideband. The newer AEM wideband voltage chart does not list a 0v or 5v...