Dustin Whipple wrote:

"Your not seeing the power numbers because the factory drive shaft speed is very critical and can reach a dangerous point when exceeding 99mph, therefore Whipple and Roush maintain this speed limit. If you wanted to remove the speed limit, you can use a Diablo, SCT or whatever to upload the Whipple tune, modify the speed limiter, and reinstall the tune with new speed limiter. Nobody needs a custom tune. The amount of time, research and knowledge that went into the calibration is certainly not something a dyno shop could do without our cal as the baseline, it's just far too much work and far too many limitations.

Thanks,
Dustin Whipple.

Mike, Dustin said that anyone can get a Xcal2, upload the Whipple tune and then change the parameters like the speed limiter which is a big issue.
You know i have a Xcal2 bought from you with 3 tunes.
Can i really do what Dustin Whipple states or the Xcal2 will recognize the Whipple tune as the factory tune and will lock it leaving us without any options to make changes ?
Thanks a lot.

 

The xcal2 does give you the ability to change settings such as the speed limiter. If Mr. Whipple states that it is possible to change the speed limiter with their base tune, then I would agree with that. I don't know if they have any software failsafes programmed into the Whippple tune to safeguard against such issues, but since it came straight from them I would say that it is possible to do and shouldn't have a lock out issue. Be careful though as this change might void your warranty with Whipple. Check with Mr. Whipple and see if it does. Hope this helps you out.

 

I agree

 

No, the XCal 2 does NOT give anyone the ability to just remove their top speed limiter - that must be done by a qualified tuner. And we have done this hundreds of times on supercharged 2004 & up F-150's, more than anyone else by far. In other words, I just don't' want people to think they can just take an XCal 2 and plug it into their vehicle and remove the top speed limiter - in the F-150, in *some* cases they can *raise* it to 125 mph if we allow it, but that does not work well, frankly - so in practical terms, the only way to do that is to have a proper custom tune done, and in that tune, the tuner removes the top speed limiter - so then when the customer plugs in that tuner and loads our custom tuning, that removes the top speed limiter. And yes, we can completely change their (Whipple, Roush, or anyone else's) tuning, no problem.

We do this all the time, and generally have better info regarding what is actually doable & safe regarding the driveshafts than most of the supercharger manufacturers - most of them are simply following Roush's lead without ever doing any testing of what actually is the maximum safe rotational speed before driveshaft wobble actually causes shortening of the shaft, or of it's failure rotational speeds, etc.

Plain & simple, the issue is with the trucks that have a 2-piece driveshaft (which is primarily the 2WD Extended Cab & SuperCrew trucks 2004 & up, for the most part). Those trucks need to have driveshaft safety loops installed to prevent pole-vaulting the vehicle should a shaft actually wobble enough in the center to cause it to shorten enough to actually pull out of the tailshaft. However, the smart thing to do is to install a proper performance type of driveshaft in those vehicles, which we can supply - we have them made in steel (no aluminum on these newer trucks), and to "NASCAR" specs, so there is no practical limitation, it can be spun as fast as most people will ever build their trucks to.

The 2004 & up 4x4's with Extended Cab & SuperCrew bodies do not have this problem, as they have a short single-piece driveshaft and it does not wobble & shorten at up to 150+ mph speeds - we've checked that on a number of these vehicles, those shafts are only 56" - 64" and single piece. It's primarily the 2WD Extended Cab & SuperCrew 2004 & up F-150's where this is a concern - or I should more accurately say, and of them with a 2-piece driveshaft.

The bottom line is, we do in fact have the ability to modify their tuning, as well as Roush's and everyone else's tuning, to do anything we want - and there are significant issues with both Whipple's & Roush's calibrations as far as we are concerned, they both need significant work in numerous aspects of driveability as well as performance, in the ETC setup, as well as things like people who want the top speed limiter removed - and we have done that hundreds of times on these 2004 & up supercharged trucks - so yes, we *can* do that.

But we properly advise our customers as well - and the smart thing to do for *any* owner of an F-150 who wants to run 140+ mph speeds is to have a proper driveshaft made and installed - have us supply them with a proper driveshaft that they can take up to 150 mph+ speeds or higher and not have to worry about it.