Shifting and pistons shutting off
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Senior Member
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From: Nawlins
Shifting and pistons shutting off
A friend of mine was telling me about something he read here and I'm not to sure about it. I tried searching for the thread but couldn't find anything.
I've got the 4.6L in my truck. He was saying my truck, after it shifts, runs on 4 cylinders until it reachs 3,000rpms again (or something to that nature)... Is that true?
I can't really imagine that since you'd want all of the cylinders going to get you that torque in the low end area.
Of course, it would be fine if my truck actually did that and a computer chip changed it because, hey, I'd be getting more power I couldn't access before.
I've got the 4.6L in my truck. He was saying my truck, after it shifts, runs on 4 cylinders until it reachs 3,000rpms again (or something to that nature)... Is that true?
I can't really imagine that since you'd want all of the cylinders going to get you that torque in the low end area.
Of course, it would be fine if my truck actually did that and a computer chip changed it because, hey, I'd be getting more power I couldn't access before.
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Joined: Mar 1998
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From: Virginia
Hi 486,
No, that is not quite correct, but there is some accuracy to it in that there are indeed things done in both automatics and manuals (yes, manuals too!) to reduce engine power during shifting.
There *is* a cylinder shutdown during the 1-2 WOT upshift on the SVT Lightning.
There are things done to reduce power during upshifts in the factory program, ranging from a transitional spark retard to leaning out the fuel to the upshift delay & more, to reduce engine power and to make the vehicle feel "smoother," so the shift cannot be felt nearly as much. That is the so-called "soft shift strategy," just one small part of what the automakers do to sell more vehicles to women.
So yes, there *are* things that are done that do indeed reduce engine power significantly during the upshift.
And yes, the Superchip does away with the power reduction during the upshift, and in doing so restores a good deal of power. In these F-150's you can easily lose 40+ horsepower during a full-throttle 1-2 upshift, for example. There are some other areas of deficit in the factory programming that the Superchip will take care of as well.
Give us a call if you want to go over all the details, etc.
No, that is not quite correct, but there is some accuracy to it in that there are indeed things done in both automatics and manuals (yes, manuals too!) to reduce engine power during shifting.
There *is* a cylinder shutdown during the 1-2 WOT upshift on the SVT Lightning.
There are things done to reduce power during upshifts in the factory program, ranging from a transitional spark retard to leaning out the fuel to the upshift delay & more, to reduce engine power and to make the vehicle feel "smoother," so the shift cannot be felt nearly as much. That is the so-called "soft shift strategy," just one small part of what the automakers do to sell more vehicles to women.
So yes, there *are* things that are done that do indeed reduce engine power significantly during the upshift.
And yes, the Superchip does away with the power reduction during the upshift, and in doing so restores a good deal of power. In these F-150's you can easily lose 40+ horsepower during a full-throttle 1-2 upshift, for example. There are some other areas of deficit in the factory programming that the Superchip will take care of as well.
Give us a call if you want to go over all the details, etc.
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From: Nawlins
