Autobahn Shelby

Good day!

I was looking at the 2011 and 2012 GT500 stock power curve and noticed that the power peaks right at the 6250 RPM rev limiter. This got me wondering what the curve would look like ABOVE 6250. Does anyone have any experience in reflashing the ECU to raise the rev limiter setting (on an otherwise stock engine) to say 6500 or 6750 RPM?

Given that the 5.4 has forged pistons, rods and crank, and that the block is indestructible, it should hold together. And the blower should be able to handle the increased RPM, because people overdrive those all the time, too.

The reason I ask is because I'm looking to get around the relative disadvantage that sets in after the 4-5 upshift. GT500's accelerate comparatively well, right up until the less-than-ideal transmission 4-5 gear ratios split.

I guess there's two ways of getting around the problem. Ideally, we could change the transmission gear ratios. But since that's not a feasible option for me, getting a few more RPM's out of the engine in fourth gear (assuming the power curve doesn't drop suddenly after 6250), would place us at a better RPM once we've upshifted into fifth gear. Of course, acceleration wouldn't be any faster in fifth gear per se, but we'd be spending less time in fifth, whilst taking advantage of the mechanical advantage fourth gear has to offer.


Any thoughts? Any experiences?

GT500Steve

Personally, I dont feel that WOT in 5th gear under boost is good for the engine. At stock boost/power levels, it might be ok, but as you make more power and the A/F ratio becomes increasingly important.... running WOT in 5th might make for a lean condition. Just my .02, but a lot of people advise against it... especially if you have turned the boost up. While these motors definately will hold a bunch of power, they are NOT indestructible.