I had a quick question. I was led to believe that when you do a dyno pull with a lightning in particular, you could drive it up to 3rd and at a certain speed of course the torque converter would lock up. I thought that after this you could maintain that lockup during the dyno run with just the stock tune or otherwise but someone just refuted that to me. I was pretty sure you can do so but I could well be wrong as I have no hands-on experience with that. Does the chip need to be tuned to make sure it locks up? Or will it maintain the lock on its own?

 

Yes... just run the truck through the gears slowly to 3rd (OD OFF!!) ...around 65-70mph (3000 RPMs) PUNCH IT.

It'll be locked, and you wont get the proverbial "hump" in your graph.

 

Right Jeff. Seems I have video of you on the dyno. Seems like the theme was "Master of the Kick Down"

Good to know you are taking your own advice now

-Mark

 

can i get a second opinion. Not to distrust maxpower (thanks for the responce im pretty sure your right) but perhaps a tuner responce just to be sure? Thanks.

 

I'm not a tuner but I've run my 03 on a chassis dyno several different times. On mine if you put it in gear and accelerate "briskly" it wil shift from first to second, then halfway through second you'll hear the converter lock (almost sounds like a slightly different gear) then it upshifts to third. At this point the converter is locked and as long as the speedo says 68 mph or so it will not downshift when floored.

Jody

 

and the converter will remain locked as well? This is with no programming correct?

 

Yes., no programming. My trans program is stock now with an ftvb, but from day one this truck would not downshift to second at 68 mph or so and the converter remains locked throughout the pull.

If I drive the truck real slow accelerating the converter doesn't lock up until 3rd or fourth gear, depending on speed. But if you accelerate at half throttle or so it locks in second and stays locked. In my truck you can feel the converter lock, and once locked doesn't unlock until a fairly low mph, 35-38 or so with the stock programming.

Jody

 

thanks