Originally posted by: Babbles
Oh, the power of VTEC![]()
Originally posted by: 0roo0roo
he knows how to take apart his engine, thats more then i can do😛
funny pic was the one with the not so amused female in the background🙂
Originally posted by: Thegonagle
Originally posted by: Pacfanweb
Let me clear it up for you: Saying "the tires drive the engine" means this: Shift from 5th to 2nd, like the subject car did, and one of 2 things is going to happen(before engine failure, that is).
Either the tires will retain traction, and force the engine to rev to whatever RPM is required to go that speed in 2nd, OR, the engine resistance will be too much and the drive wheels will lock up and skid.
It will completely not matter if your foot is on the gas or not.
If you are at 7k rpm in 5th, and are going, say 125 mph, all you have to do is the math to find out what rpm it would take for the car to run 125 in 2nd. If you make that downshift, the speed of the car is going to dictate that either the tires are going to drive the engine to whatever that rpm is, or they are going to skid.
Hope that cleared it up.
That's easy!
That clearly expliains the two things that could/would occur before engine failure.
It's most probable that at that at that kind of speed in 2nd gear, a combination of those things will happen. I.e., the tires will skid a bit, but still maintain enough traction to significantly overspeed the engine.
In my mind possible that whether a foot was on or off the gas could matter a little, due to the difference between the restrictive effect of an open and closed throttle plate (and not the burning of additional fuel, since the fuel would obviously be cut off by the ECU during an overspeed event). I could be wrong. (Hmmm. Got me thinking, how does a Jake Brake work?)
No..that would try and 'overspeed' your wheels -- that's how people can chirp their tires when shifting. You wouldn't slow down at all, but with such a low gear ratio at that low speed, your acceleration would be crap..lolIf you were nearing redline in 1st, and you shifted to fifth... wouldn't that try and overspeed your engine? Isn't that what compression braking is? If you did that, you would slow down very quickly, no? Because the gear ratio is low, your tires don't have to spin nearly as many times to turn the engine over once as they would in a higher gear.
Pretty much.Ok, I think I get it now. When you do that, the tires become the "drive" and the engine becomes the "driven", correct? So the gear ratio is indeed reversed?
Originally posted by: isekii
Originally posted by: 0roo0roo
he knows how to take apart his engine, thats more then i can do😛
funny pic was the one with the not so amused female in the background🙂
Taking it apart is the easy thing.. The hard part is putting it back together.
Originally posted by: Eli
Originally posted by: Thegonagle
Originally posted by: Pacfanweb
Let me clear it up for you: Saying "the tires drive the engine" means this: Shift from 5th to 2nd, like the subject car did, and one of 2 things is going to happen(before engine failure, that is).
Either the tires will retain traction, and force the engine to rev to whatever RPM is required to go that speed in 2nd, OR, the engine resistance will be too much and the drive wheels will lock up and skid.
It will completely not matter if your foot is on the gas or not.
If you are at 7k rpm in 5th, and are going, say 125 mph, all you have to do is the math to find out what rpm it would take for the car to run 125 in 2nd. If you make that downshift, the speed of the car is going to dictate that either the tires are going to drive the engine to whatever that rpm is, or they are going to skid.
Hope that cleared it up.
That's easy!
That clearly expliains the two things that could/would occur before engine failure.
It's most probable that at that at that kind of speed in 2nd gear, a combination of those things will happen. I.e., the tires will skid a bit, but still maintain enough traction to significantly overspeed the engine.
In my mind possible that whether a foot was on or off the gas could matter a little, due to the difference between the restrictive effect of an open and closed throttle plate (and not the burning of additional fuel, since the fuel would obviously be cut off by the ECU during an overspeed event). I could be wrong. (Hmmm. Got me thinking, how does a Jake Brake work?)
Hmm, for some reason I'm having trouble visualizing this. It's backwards in my head, it seems like it would be the other way around.. because you're shifting from a very low ratio.. to a very tall one.
If you were nearing redline in 1st, and you shifted to fifth... wouldn't that try and overspeed your engine? Isn't that what compression braking is? If you did that, you would slow down very quickly, no? Because the gear ratio is low, your tires don't have to spin nearly as many times to turn the engine over once as they would in a higher gear.
Ok.. let me figure this out. Let's say your gear ratio is 5:1 in 1st, and 1:1 in 5th.
So you're going 100MPH in 5th.. for every engine RPM, your rear tires turn once.. And you shift it to first, 5:1.. and let off the gas.. hmm.. does the gear ratio then work backwards, 1:5? everytime your rear tires turn once, your engine will turn 5 times? Is that what I'm getting confused?
Ok, I think I get it now. When you do that, the tires become the "drive" and the engine becomes the "driven", correct? So the gear ratio is indeed reversed?
I have no idea why I had that mixed around in my head. Bizzare. 😛