Junkyard Dog
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576 horsepower to the wheels, naturally aspirated?
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Junkyard Dog
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Why does the horsepower drastically change lower right after 4 minutes in the video? Does anybody follow what is going on?
Ryunker
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Nope, just more lame "click bait"
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Junkyard Dog
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Well, they seem to get the horsepower at the end, and the video is marketing to sell their NA horsepower package, but I am just having a hard time following what is going on, especially right after the 4:00 minute mark.
It really does not help that in older videos they are keeping secret all the changes they make and just showing dyno runs with that car.
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Junkyard Dog
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Maybe Steeda will chime in and explain why the horsepower suddenly is shown in the 400s and then goes back up into the 500s.
robvas
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You're looking at an old chart before they added more mods. That's back when they just did ported heads
They are trying to show the difference heads made before they talk about cams
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Junkyard Dog
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Watch the video in the original link. Pay attention right after the time stamp of 4 minutes in.
The horsepower and torque change at 4:02, so maybe watch before that for context and then just be alert for that moment. I am sure there is an explanation. I just have no idea what it is.
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Junkyard Dog
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OK, so that is the dyno chart from the ported cylinder head swap and 2 inch headers over a year ago, back in October of 2024, with E30 and no tune.
Got it.
Thank you for finding that. They could have explained that in the video clearly instead of leaving us wondering.
keithwalton
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Reving beyond 8k ? that seems a little to high.
Adding the cobra jet added 500rpm to the fuel cut ?
Adding the cobra jet added 500rpm to the fuel cut ?
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Junkyard Dog
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They do rev it over 8000 rpm, but as you can see the horsepower falls off rather steeply at 8000 rpm, and it is falling even before 8000 rpm, just not as steeply. in fact, the peak horsepower is at a low 6,557 rpm. That appears to be a lower peak than the previous two options.
keithwalton
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The question was more how did they rev it that high when the factory hard cut is 7.5k and soft cut 7.25k
Smells like they're fiddling with the dyno ratio if they're using implied crank speed from wheel speed.
keithwalton
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Still wildly inconsistent between runs, unless they decided reving a coyote beyond 8k was a bad idea.
Would be interesting to see the valve closing velocity on a GT vs DH vs that modified cam.
Seems to me like ford were cam'd the DH to rev higher than a GT but ran into issues late in the game and capped them the same.
Would be interesting to see the valve closing velocity on a GT vs DH vs that modified cam.
Seems to me like ford were cam'd the DH to rev higher than a GT but ran into issues late in the game and capped them the same.
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