Idea For A Trans Mod... - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 10 (permalink) Old 11-23-2009, 05:57 PM Thread Starter
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Idea For A Trans Mod...

Would it be possible to eliminate the signal that the trans recieves to "kick down" a gear?

Such as a switch that could be thrown in 3rd at low rpm to cancel out the downshift? I'm just wondering, because I know it can be done with tuning, but it's not always beneficial to have something like that, but it'd be nice from time to time...

Is there a signal that is given that could be interrupted? Or is it all TPS based in the PCM?


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post #2 of 10 (permalink) Old 11-23-2009, 06:13 PM
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Re: Idea For A Trans Mod...

Downshifting is a function of vehicle speed and pedal position. There is no "kickdown" signal. I don't know how to do what you are proposing, except for a custom tune.
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post #3 of 10 (permalink) Old 11-23-2009, 06:19 PM Thread Starter
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Re: Idea For A Trans Mod...

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Originally Posted by Mark Kovalsky View Post
Downshifting is a function of vehicle speed and pedal position. There is no "kickdown" signal. I don't know how to do what you are proposing, except for a custom tune.
Ok. Thanks. I figured that'd be the case, but no harm in asking.... Guess that'd be what a "dyno" tune would be for....


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post #4 of 10 (permalink) Old 12-02-2009, 09:52 PM
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Re: Idea For A Trans Mod...

Jody had my 80 tow tune set-up to where it wouldn't down shift from 3rd to 2nd unless you were really going slow or had a ton of peddle in it. I usually pulled it down manually. It worked good for me so I know what your asking.

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post #5 of 10 (permalink) Old 12-09-2009, 01:35 AM
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Re: Idea For A Trans Mod...

couldn't you do a TC lockup switch? as in, wouldn't the computer see that it's locked and not try to downshift?

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post #6 of 10 (permalink) Old 12-09-2009, 01:47 AM
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Re: Idea For A Trans Mod...

Just have a different file that acts the way you want it to and switch to it....

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post #7 of 10 (permalink) Old 12-09-2009, 02:17 AM Thread Starter
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Re: Idea For A Trans Mod...

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Originally Posted by secondarychaos View Post
couldn't you do a TC lockup switch? as in, wouldn't the computer see that it's locked and not try to downshift?
No. The trans still works the same with the TC locked. It'll kick down and shift up just the same.


And Matt. I knew that was an option. I was just wondering if my idea was possible. As in interrupting the "kickdown" signal on demand. I figured it was worth a shot at asking. But it's not possible, so if I really wanted a tune like that, I guess I'd just have to order one.

Could you build a tune that only kicks each gear down based off of vehicle speed?

That way it'd work fine as far as slowing to a stop, and then climb through the gears, but you could give any amount of throttle input and it would not "kick down". Only downshift under a coasting condition and under a given speed per gear?

I don't need this, I'm just wondering if it is within the realm of a stock PCM's shift tuning ability. Or if you would need something like PCS for that type of control.


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post #8 of 10 (permalink) Old 12-09-2009, 03:57 AM
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Re: Idea For A Trans Mod...

Quote:
Originally Posted by theSLEEPER View Post
No. The trans still works the same with the TC locked. It'll kick down and shift up just the same.


And Matt. I knew that was an option. I was just wondering if my idea was possible. As in interrupting the "kickdown" signal on demand. I figured it was worth a shot at asking. But it's not possible, so if I really wanted a tune like that, I guess I'd just have to order one.

Could you build a tune that only kicks each gear down based off of vehicle speed?

That way it'd work fine as far as slowing to a stop, and then climb through the gears, but you could give any amount of throttle input and it would not "kick down". Only downshift under a coasting condition and under a given speed per gear?

I don't need this, I'm just wondering if it is within the realm of a stock PCM's shift tuning ability. Or if you would need something like PCS for that type of control.
Although somewhat cryptic, it can be done with the factory PCM.

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post #9 of 10 (permalink) Old 12-09-2009, 04:10 AM
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Re: Idea For A Trans Mod...

if it can be done with a tuner, i wouldn't see how it couldn't be done by interupting or fooling the shift solenoids.i couldn't really say how a factory PCM would act, but you would essentially be choosing the gear you wanted based on the shift solenoid signal.

when i was in the beginning stages of swapping to an automatic, and before running an entire engine harness and factory PCM, we were able to command different gears based on an on or off signal by jumping a live wire to that solenoid. sounds pretty basic, but it's something my dumb ass would start an idea from...

now that i'm thinkin about that, didn't charles come up with a shift set up like that, even though he had a PCS stand alone...

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post #10 of 10 (permalink) Old 12-09-2009, 04:16 AM
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Re: Idea For A Trans Mod...

Quote:
Originally Posted by Hawker View Post
if it can be done with a tuner, i wouldn't see how it couldn't be done by interupting or fooling the shift solenoids.i couldn't really say how a factory PCM would act, but you would essentially be choosing the gear you wanted based on the shift solenoid signal.

when i was in the beginning stages of swapping to an automatic, and before running an entire engine harness and factory PCM, we were able to command different gears based on an on or off signal by jumping a live wire to that solenoid. sounds pretty basic, but it's something my dumb ass would start an idea from...

now that i'm thinkin about that, didn't charles come up with a shift set up like that, even though he had a PCS stand alone...
The PCS has a nice digital UP/DOWN input function that the factory can't do.

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If you have nozzles that were Extrude honed over and over and over again. It will look like a porn stars ass.hole where the pintle is supposed to seal.
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