Aight guys I went to the dyno day in Benson, NC on Saturday and I got the charts from the truck. I was quit impressed with how smooth the torque curve is and the fact that this engine is still making power without much loss in torque all the way to 5550 when he let off! The first run, the tires were kinda wet and it actually spun up on the dyno and registered some crazy numbers, the 2nd run he got a nice smooth pull and got a consistent 12:1 A/F ratio. It had a consistent increase in HP and made 345hp @ 5550 rpm, and 365 torque @ 3000-3800rpm and stayed above 350 ft lbs all the way to 4600 where it began to SLOWLY taper off. With completely stock trucks running usually ~225 HP at the rear wheels that assures the 25% loss through the drivetrain that is common so that should effectively put me at 430HP and 456 ft lbs at the flywheel. I think that is pretty good for a 6psi non intercooled setup. I can't wait to see what kind of numbers that whipple will put out and this goes to show you what these engines are capable of. We had Doug from BamaChips there doing the tuning for us and the Roush setup had some quirks........After those 2 runs he loaded his tune and wanted to play with it some, and when he made that run, the A/F went up in the 13:1-14:1 range and after a few more attempts, he loaded the stock tune and sure enough, it wasn't something in his tunefile but the factory one was doing it also. We then looked at the MAF to see if it was maxing out, and it was only going to about 80%, so that wasn't it. Then we looked at fuel PSI and found that the PSI would stay constant at first and then begin to get a little inconsistent. He said that the stock pump apparently doesn't have enough output to handle the increased load. So my question is, why would Roush put something out without a fuel pump in the kit when it is obviously needed? My next options are to get a higher flowing fuel pump and possibly hit the dyno up again. IDK, I'm kinda pissed that I haven't known about this all this time, and could possibly be doing damage if I don't get that A/F back down where it should be under boost. HERE IS THE VID of just my truck, set it to ORIGINAL size. I have the whole thing and will be working on it later......Here is a pic of the dyno sheet, tell me what you guys think about this situation.......



EDIT: Oh, and the reason the A/F goes up really quick toward the end of this run is due to something with the airflow over his sensor in the tailpipe and it screws up at higher RPM's, it did this on nearly every vehicle we tested.

 

good numbers one question with the roush tune how did u raise the speed limiter? were u in drive. i have the roush as well 338hp an 377tq

https://www.f150online.com/galleries...w.cfm?num=9331

 

Wish I had that much power!

 

Cool. I would have to say that there is a max of 20% drivetrain loss, putting a stock F150 and what should be 240HP at the wheels, however that would assume the 5.4 3V is putting out 300HP but a stock F150 will not put out those numbers without a tune. At any rate, pretty good numbers for only 6psi nonintercooled, throw in an intercooler and fuel pump and crank up the boost!! I think with 400RWHP you could hit high some 13's, geez these things are heavy lol.

 

Sick.

 

So, did they ever get your A/F right? Even on the stock roush tune?
Do our trucks have the returnless fuel system? If so they are VERY tricky to tune.
How big are our injectors? They might be limiting as well.
On a side note, i saw the two guys garage with Jerry for SCT and the dynoed a 3valve GT to 500/500 with a WhippleCharger. So the power can be there.
They included new injectors in their kit and SCT put bigger ones in there too.

Good numbers but SCT tuned 60 hp over the Whipple tune. SO there is more i think.

 

that's really awesome...I'm surprised the factory fuel pump can support even more horsepower than stock! usually stock pumps suck...congrats and nice truck...it gives me desire to do a power adder down the road once the warranty is up...I'd like to do a turbo setup since I am more familiar with those

 

matt ive been talking to a few people, who say that with larger injectors you wont need as much fuel pressure, i think that will be the way to go ultimately, considering youre still running stock injectors.

WHERE ARE THE VIDEOS!!!

 

I was at the dyno and saw an '04 5.4 3 valve lay down over 370 horses with 8 pounds of boost on the STOCK pump. Air fuels were in the 11.4-11.8 range. Maybe all these trucks are not as similar as some think..And the tuning surely has a lot to do with it.The stock pump should support your mod...Have you changed the fuel filter on your vehicle?

 

That's alot of HP...I just don't understand why the gain in HP on these trucks with superchargers is not as much as you get when you put a SC on a Mustang. Usually, on a Mustang, you get about a 50-60% gain in HP. On the F150, if you get 30%, it's considered a good gain. Of course, I am thinking of a 4v Cobra engine...I guess the 4v engine really takes to supercharging due to the extra valve.

 

I second that.

 

Thanks for the . I'm gonna borrow a laptop and go do some looking and I emailed Roush on the problem so we'll see what they have to say why their product would cause a lean running problem.........Oh and I added a VIDEO link in the original post, go check that out......

 

If you are still runnign stock injectors, and your tuner cant figure out why you are running "lean" you, and he KNEW you had stock injectors.. I suggest you go to a different tuner....

 

Was the timeslip below performed while you have the supercharger installed?

 

3rd that. thats pretty impressive