[Dusten]

Originally Posted by Mercury

Good post dusten, I appreciate your in depth description

I will say however, since the programmers do not do over 35, then isn't the only option an inline device?

other than leaving the speedo incorrect, yes.

I thought Truspeed did make them for the 08, I know speed wizard is on many 08's and no problems.

if they do, they dont list it on their site.

From my experience, I have a 2003 F250 5.4L gas engine, my computer was programmed from the factory with 31.7" tires (stock ones) i never had the computer re-programmed EVER, other then me using my tuner to change tire size (which did nothing by the way)

The engine or tranny on my truck does not use "speed" from the ABS module, and as a matter of fact (i have spent a lot of time researching this), based on my research, the only ford engine / tranny from 99 04 that does use the speed signal is the 7.3L, but when you correct the signal in the right spot (before it gets to the engine/tranny) then the engine/tranny will use the correct value.

i wasnt using the abs as an excuse, when i asked pro comp why my controller that i bought stopped at 35". They said "it sets off the abs light to go above a 35"

What about on the older trucks, when no computers were even involved... the speedometer was corrected by a speedometer gear, this method has worked well for many years, to me an inline device is doing in essence the same thing.

this is similar but, mechanical, and that is the difference.

Sure I have to agree that when you use a programmer the computer knows how many pulses per revolution it is getting, and it is the right value. But is there any functional difference between that and just sending the computer a modified value?

my issue with inline foolers is it may not be only the ecm using that signal. And changing that signal can effect the function of other things. I work with electronics daily, and i know that often times more than one feature uses a signal for calculation.

When you put larger tires on you the same pulses per revolution as before but you will travel more distance (therefore 30mph as indicated is actually more)

sorry if i am coming across blunt or ignorant, I just do not understand why anybody would be against inline devices where actually there is nothing else that WILL work...?

Thanks for the quick response

Kenny

they are the only resource for our trucks, but other than fixing the speedo, they dont change anything else. shift points, and the likes are all not effected by speed inputs. that is why i chose to leave mine alone.

And as stated before, i dont like them because i have never been a fan of changing something outputed signal. I would much prefer to change the way the signal is used at the end point