The FRPP ProCal tune for the Kie Oatie claims an additional 60 torques at 1500rpm. That's from the (CARB-legal) tune alone. My suspicion is not highly, but seems to me if a California smog-legal tune alone can add that many torques to a stock 5.0, a more aggressive tune could account for as much as all that hardware, together, with or without the "please-let-me-not-have-wasted-all-that-money" factor.
I don't want to muck up sky render's superb build thread, but wanted to comment briefly on the above. Ford claims that the coyote will run just fine on 87 octane fuel. You lose 10-12 hp at the top end ( vs 91 octane)... but the tq drops way off at the bottom end. Just switching from 87 to 91 octane will make a big tq difference. The more agressive pro-cal 91/93 tune is supposed to net you 60 ft lbs of tq. It does. But that only pertains to the coyote eng. I don't think they mean 60 ft lbs of tq vs oem tune with 91 gas either.
I have a 2010 GT.... which uses the last of the 4.6L 3 v engs. No tune by anyone will net you another 60 ft lbs of TQ at the bottom end. The 4.6 is an obsolete eng by any standard. I installed a small roush M90 blower 6 months after I bought the car. I tried an experiment, and instead of using a smaller blower pulley, I instead added the LT's, high flow cats, bigger TB, 94 tune, and 1 piece DS. Boost remains the same... but rwtq is 80 ft lbs higher at 2200 rpm.... vs b4 the mods (and using roush 91 tune).
B4 the mods were added, I had VMP send me a new, this time a 94 octane tune. Crank hp increases by 20hp from 440 to 460. Bottom end tq barely increases. It was a modest, subtle improvement at best.. I was not impressed. Then the various mods were added....and another 94 tune. Ok, then it all came together. The bigger TB is a waste of effort on any NA 4.6L.... but makes a small improvement if a blower used. The DSS-DS went in next. The tach comes up slightly quicker, and some folks (myself included) notice that you tend to hit the rev limiter way more often..esp in 1st + 2nd gear.
The LT's + high flow cats made the biggest difference. The bottom end TQ increase was immediately noticeable. The JBA's are a lot longer than kooks...and are optimized for the lower-mid rpm ranges. Still more power at the top end..but not as much as kooks lt's. In retrospect, it would have been a lot cheaper to have just used a smaller blower pulley. LT's are not cheap, esp the install. However, the blower is rarely used on the street. The DS, bigger TB, and esp the LT's and hi flow cats are all effective in NA mode. A smaller blower pulley is only effective when in blower mode.
If I had to do it all over again, a 2011-2014 coyote would be the ticket... and no blower. I'd install LT's, high flow cats, DSS-DS, and a 94 tune....and call it a day.
