[Power Hungry]

Just for reference...

Calibration development was done on 2004, 2005 and 2006 F150 trucks. On all of them, we would push them well past what I would consider "normal" modifications and all of them resulted in zero failures.

I personally drove the 2006 for almost a year. Modifications included 35" tires on a 5" lift, a "snorkel" mod, and a NX Nitrous kit set at 150 HP shot. (Yeah, it was freakin' AWESOME when it hit!!)

Testing maximum limits were as follows:

Rev Limiter - 6000 RPM
Speed Limiter - 150 MPH
Timing - +5 Deg. (Running appropriate octane fuel for calibration)
1-2 WOT - 5300 RPM
2-3 WOT - 5300 RPM
3-4 WOT - 4800 RPM
1-2 Firm - +25%
2-3 Firm - +25%
3-4 Firm - +25%

I drove with the shift firmness set at +25 nearly all the time (including when running the nitrous) and hadn't had any issues. Of course, this is only one vehicle and others may not respond identically.

The fact is that mechanical failures happen for a variety of reason, even on unmodified vehicles. If there are any components in a vehicle that are marginal, then performance products or any other modifications that increase strain (lift kits, big tires, etc) can push those marginal components to the point of failure. Unfortunately, there is simply now way to account for those types of failures. In most cases, this tends to be the transmission, although the number of transmission failure I've seen over the last 5 years have been extremely low... less than 10 (maybe less than 5) that I'm aware of.


Fisherman,

While I doubt that the problem with your trans is specifically related to unusually high RPM settings or aggressive shift firmness, I think those settings may have contributed to the failure of marginal components that would have failed of their own accord at some point.

I hope this makes sense...

Take care.