Question for the Mad Dr. - Page 4

***Power Hungry*** · #31 Thu, March 5th, 2009, 08:26 PM

From what I've seen, this phenomena only occurs at lower RPM ranges. Once you approach a certain RPM point, the map transitions to the standard throttle mapping. It just seems to make the throttle less aggressive to avoid losing control in slippery situations such as wet or icy roads.

This is one area I'm still trying to get figured out as far as when it transitions and just exactly how it fully functions. As Lars said, it's there for a reason. For some people it's an inconvenience and if they want it removed I'd like to be able to add it as an option.

Take care.

***Jackpine*** · #32 Thu, March 5th, 2009, 09:58 PM

Orygun and Bill - I was trying to say what you just said in my post where I described the TP vs PP curve as parabolic. A slow rate of increase in TP at first, but climbing more rapidly at upper PP values until reaching the same (rates?) or TP values as happens in Drive.

And yes, this seems like a perfectly reasonable design strategy.

I probably should have tried to include a graph describing the effect, but I needed to do some work on the trees in our property.

- Jack

***88Racing*** · #33 Thu, March 5th, 2009, 10:13 PM

Now I am not trying to drag this out!

I agree with Bill if people want that option let them do it.

This just for curiousity: Does any one have a f150 stx with a mt and if so does it have a traction control button on the dash? I know most later model gm cars with mt have them and they act the same way once slippage is sensed. My parents windstar van has this button also and its an at.

I am just trying to show that in some other vehicles its just a button. It should make it easier to track down knowing that little piece of info.

From experiance in a 02 camaro mt the tc button did not help to win a race it made it feel like the f150's 1st and 2nd. Glad it wasn't for pinks.

Lars

***Power Hungry*** · #34 Thu, March 5th, 2009, 11:34 PM

On the 6.4L diesel, there is a switch to engage or disengage traction control if excess power causes traction loss. Many high performance vehicles such as Mustangs also have traction control, often with a switch to manually shut it off.

Jim,

In regards to the throttle control, as near as I can figure it isn't using a parabolic sort of curve... at least not as you described. It appears to be more that it transitions from the lower map to the normal map. I guess the effect would be the same, but it isn't handled in a single map.

***Jackpine*** · #35 Thu, March 5th, 2009, 11:54 PM

Jim???

Glad I'm not the only one that has momentary lapses!

A discontinuous curve makes perfect sense too. I was just trying to explain why I didn't seem to lose any high PP/PRM power.

- Jack

orygunf150 · #36 Sat, March 14th, 2009, 03:04 PM

Had the chance to do a little wheelin the other day.... seems as though the infamous power reduction does not occur in 4LO. Hmmmm.

***88Racing*** · #37 Sun, March 15th, 2009, 12:50 AM

Quote:

Originally Posted by orygunf150

Had the chance to do a little wheelin the other day.... seems as though the infamous power reduction does not occur in 4LO. Hmmmm.

Well that one there might give Bill some more info on where the switch is in the program or module.

Good info.

Lars

98infinity · #38 Mon, March 16th, 2009, 11:50 PM

Quote:

Originally Posted by RED4

If you put it in 2nd gear, it stays in 2nd gear...all the time. That includes when you start from a dead stop.

That is incorrect, I hate when people correct me but if in 2nd gear it will shift from 1st to 2nd and back down. In 1st it will not shift up to 2nd.

TA2Dsailor · #39 Mon, March 16th, 2009, 11:58 PM

Quote:

Originally Posted by 98infinity

That is incorrect, I hate when people correct me but if in 2nd gear it will shift from 1st to 2nd and back down. In 1st it will not shift up to 2nd.

I guess my trans is messed up then.

If I place mine in 2nd it stays. No down shift no upshift.

superdutynick · #40 Tue, March 17th, 2009, 04:50 PM

It has been my experience that with most, not all, when you select 2nd with the shifter in an AT it stays in 2nd will not shift up or down. I have a 6.0 PSD with the 5 speed AT and when you select 2nd it will not leave 2nd, same is true when you select 3rd from a dead stop you start out in 3rd.