I'm trying out a buddies 1715 on the hp4 setting, (03l with a 2# and line mod valve .427") I have the shift point set for stock and the pressures set at the superchip setting. My question is where is the stock pressure? (as it toggles from min to max, is min stock or less then stock? is the middle superchip or lower?) The shifts are not overly harsh but I'm questioning wether i should back it down a bit or not.

Thanks.

 

On the Lightnings the 1715's shift pressure adjustments work differently than they do for all other F-150 platform vehicles. And, those 4R100-HD's shift all over the place firmness-wise to begin with, they are not real consistent.

The 1715 simply doesn't allow you to tailor in a LMV or FTVB properly for a Lightning, and was never intended to - it's designed to work with a *stock* transmission.

With Lightnings using the 1715, "MIN" generally gives you what comes in the older standard blue Superchip modules with their "standard" Superchips performance program, so you can't even get all the way back down to "stock" for the shift pressures on Lightnings when using the 1715.

So usually with a .500 LMV they need to be set to MIN to have any hope of avoiding harshness on light-throttle shifts, but with the .427 valve you simply set them to wherever they feel good. However, in many cases a .427 LMV isn't large enough to allow the tranny to flow enough fluid volume to prevent the clutches from burning on a full-throttle upshift, which is why we use a .500 LMV or the FTVB and then calibrate the transmission properly in a *custom* tune.

 

thanks for the info, just trying out the 1715 before winter hits so maybe in the spring i'll have to try something new, thanks again.

 

You're very welcome, & good luck!