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  1. Help explaining horsepower and torque feel

    This is physically correct. But let's be clear - (b) is the problem you're trying to solve when you're trying to accelerate your car. You are always currently at some speed. It is by maximizing HP (using whatever gear and RPM is required to do that) at that speed that you maximize...
  2. Help explaining horsepower and torque feel

    There's no good reason to do that. The first thing to think about is how you'd program a CVT for maximum acceleration if your car had one. You'd set it to run at the peak HP point and never move off it. Crank torque is irrelevant, as it always is. Say you don't have a CVT, but rather a...
  3. Help explaining horsepower and torque feel

    Yeah, that's one thing that makes the mustang exceptional to drive for me. Since peak HP is at redline, you never really want to shift. You're just forced to by the rev limiter. Acceleration drops when you upshift. Where as with say a FE 427 Cobra, you're like 1000 RPM past max power at...
  4. Help explaining horsepower and torque feel

    Yeah, I got to stop engaging with this. He's ignorant of basic physics.
  5. Help explaining horsepower and torque feel

    This has everything to do with traction/launch and transmission issues, which is why the ETs and trap speeds are reversed. It tells you essentially nothing about the engines.
  6. Help explaining horsepower and torque feel

    Or put another way, given a few maritime reduction drives I could easily make a 1 million lb-ft coyote. Just reduce the output speed by a factor of about 2400. Now the question is would this engine be of any use in accelerating your car faster? Would it give you 1 million units of...
  7. Help explaining horsepower and torque feel

    Oh that's quite clear - you lack the physics understanding to understand this discussion.
  8. Help explaining horsepower and torque feel

    Quick, Jackson1320 is giving away free lunches. Why not gear down 1000x and have THE MOST POWERFUL ENGINE ON THE PLANET?!?!? Seriously, you need to look back at that equation you don't understand that relates HP and torque. When you gear down by a factor of N, you get N times the torque at 1/N...
  9. Help explaining horsepower and torque feel

    You don't even vaguely understand how a dyno works. Trying to educate you has proved futile. So you get yo just keep being ignorant :D
  10. Help explaining horsepower and torque feel

    And yet you continue to not understand. Just because you can copy an equation I already posted doesn't mean you understand it :D
  11. Help explaining horsepower and torque feel

    Yes. The key point though is that HP is gearing-independent. When you gear down by say a 2x ratio, you double the torque and halve the RPM. If all you look at is torque, you'd think you'd doubled your output but of course that's not true.
  12. Help explaining horsepower and torque feel

    Wrong. They back out the drive ratio in an attempt to give engine torque. There are drivetrain losses of course, but other than that it's engine torque not wheel torque. Which is why what you get isn't dependent on what gear you use for the dyno pull.
  13. Help explaining horsepower and torque feel

    The problem with using torque as a means of measuring engine performance is that it is dependent on the overall drive ratio. It's only torque/force at the tires that matters. Torque at the crank, which is always what gets reported, tells you essentially nothing. That's why in the example above...
  14. Help explaining horsepower and torque feel

    OK, I'm not personally familiar with that engine but let's find a dyno curve for it: https://www.ford-trucks.com/wp-content/uploads/2015/09/inside-look-6-7-power-stroke-including-2015-updates19.jpg Note that this curve looks weird because the torque and HP aren't on the same scale, so the...
  15. Tramline much?

    This is the key point. Tramlining is caused first and foremost by toe out on the front tires. There is some argument for this sort of alignment on certain track cars, but on a street car it's insane. Neutral or very modest toe in on the fronts (and toe-in for acceleration on the rears of...
  16. Help explaining horsepower and torque feel

    OK, the first thing you need to understand is that you always need to be thinking "at the operating point". So say you installed a supercharger and it added 250 HP, and let's say this is on a Coyote, and that both the before and after numbers were measured at 7500 RPM. Now, you need the basic...
  17. Help explaining horsepower and torque feel

    No. Back to physics 1 for you :)
  18. Help explaining horsepower and torque feel

    Torque is a bad way to think about engine power because it's affected by gearing. Horsepower is not. What you really want to look at is the horsepower at the rpm and throttle position you are operating at. That's what will tell you what the car will do. Say my car is running at 60mph in 3rd...
  19. Wheel spacer size recommendation

    Depends on your wheel offsets.
  20. What's Your Profession?

    I design computer storage hardware - hard disk drives and solid state drives.


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