I will attempt to clarify. This post will likely be long...
Yes, This is the same DynoJet machine as the first results I posted last November. However, last November the machine was set-up differently for readings. The DynoJet can be set-up as either RWD or AWD, and have programming for power loss accordingly just from running on the Dyno.
Last year the DynoJet was set-up to automatically factor in 15% Dyno power loss. Thus, I only had to adjust those outputs for the 15% AWD drivetrain loss to achieve approximate crank horse power.
This time there was a different tuner who was kinda ready for me. However, he had set the Dyno up for RWD with a 15% Dyno power loss. Then, when he saw my AWD badging (thank goodness I hadn't removed that
badge yet..), he had to change the Dyno set-up to AWD. This process involves both programming and physical gear changes to the DynoJet. When he did that, he neglected to set-up the results to factor in the 15% Dyno power loss. It was set to zero. (Plumb stupid in my opinion, but what do I know?)
Thus Novembers' 383 included the 15% loss factor and this ventures 346 didn't. To equal out, we must divide 346 by .85 to get a direct comparison: 407.
If he had set up the Dyno correctly, the graph would show 407. I attribute the 407 - 383 = 24hp gain due to the SSR secondary DP's, freshly cleaned air filters, perhaps some temperature/humidity differences and a better (very subjective) tuner (dyno operator).
Further, the 380/407 must now be adjusted by the average expected AWD drive-train loss (15%) to achieve crank hp: 407 / .85 = 478.
Lastly, for sh!ts, grins, giggles and more potential controversy, it
might be fair to adjust the hp output to sea level. The altitude of the tuning shop is 3,996 ft. The experts (mystical creatures known as engineers) quantify horsepower loss at 3% for every 1,000 ft of elevation: 3% * 4 = 12%. I am not aware of another ECU tuner than
@PRESSERtech LLC, except Tork. According to their website, Tork is located in Auburn WA and the elevation at their address is 56 ft above sea level. If I adjust my output at crank by 12% to account for the elevation difference it would be 478 / .88 = 543 hp. If I recall correctly, my output compares favorably to their quoted gains.
Again, the bottom line for me is I love my tune. It feels amazing and those who've driven it are out-of-their-minds impressed. Exactly what the power gains are I leave up to the machines and apply my understanding of the information available. For example, it may be possible that because my tune is even more heavily biased toward RWD (upwards of 90+%), my actual drivetrain loss might be less than 15%. Maybe my drive-train loss is only 10% and I have 5% less hp at the crank? I won't shrivel up and die if I have 27 less hp. These things are estimates/educated guesses. The proof only happens when the actual rubber meets the road versus another car, radar/laser gun, 1/4 mile track run, etc....
I hope this helps the community decide between an actual ECU tune vs a piggy-back vs leaving things stock. I'm still running stock plugs, (albeit gapped the same on all six) and have 17,654 miles on my car. No plug issues, snap-my-head-back acceleration AND excellent fuel economy compared to most actual quotes on the forum.