f8tlSHO said:
This was a mustang dyno, correct?
What boost level is this?
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It was on a DynoJet, its actually the same model as the one that AJPTurbo did his dyno on a while back (before he sold his SHO).
I believe its commanding a bit over 15psi, its the same rev as the last few logs I posted in the wastegate mod thread. I seem to remember AJPTurbo saying it was looking for ~15psi.
We did determine that the "peak" torque numbers on some of the dyno graphs out there, are due to the spike on shift in/shift out. On these pulls the car was in 3rd from the start, and then the dyno operator nailed it
Based on my conversation with AJPTurbo my car is just about where it should be, and as mentioned, I could have gotten away with a higher wastegate spring on the dyno due to the way load is applied, it had enough that a 15.95 spring probably would have opened the gate (it was open for all 3 of the power pulls, the entire pull). BUT, the 14.5 spring is perfect for the load applied on the street.
AJPTurbo's dyno numbers on his car were with a bit more boost, not sure of his spark, though I believe it was lower.
This is an excerpt from my email with him, which explains why there would have been more horsepower with an increased spring rate, straight from the Log Warlock: "I think if the wastegate duty was a bit lower things would be more efficient and power would've been closer to 400...When wastegate duty is high the gate is more shut in the turbo because it's trying to spin the turbo for more boost but then all the exhaust is exiting through the little turbine and not as much is escaping the wastegate."
Like I said earlier, I will keep it AS IS for now, and once the tracks open, get some baseline runs on the current setting. Then for the sake of track times, and since it will be warmer, we will probably tweak the tune a bit more (read: more boost) and I'll increment the wastegate springs and go up to the 15.95 and maybe even the 17.4 depending how things look at that point. I will try and do each of those changes one at a time so that I can get more of a comparison.
I am excited to see what this tune runs at the track, since my car ran 14.1 stock(just axelbacks and resonator replaced with an X-pipe), and 12.87 on 93 with 15 psi and a tune and CAI added to the car (plus the mods that were there with the 14.1).
Since then it has gotten E20, much revised tune, 170 thermostat, catless downpipes, hotpipes, boost regulator mod, and a TiAL Q BOV. Some of those (BOV and Chargepipes, as well as T-stat) are more of supporting mods to run a more aggressive tune, but still should be nice to see the gains. I hope for 12.3 or better as the car sits.
Probably be best to leave work early and head to the dyno shop so we can all see the results and get on with the rest of our day . . or just hang up on analyzing your dyno sheets and logs for the rest of the evening. Bwaahaa
