Hello every one, can any chime in, Hopefully bill. But what is the Accuracy Of Edge's Performance Testing?

 

as long as your speedo is adjusted correctly it is very accurate in 0-60 and 1/4mile

 

yea my speed-o is dead on...

 

mine is off 2mph the edge says 60 and my spedo says 62

so in the 0-60 and 1/4mile time would it be higher or lower than the edge is saying

 

that is true, but i do know for sure my speed o is dialed in...

was just wondering how accurate the test are, because i did some tonight and had some impressive results..

 

what were your results......and what exactly is your truck?....2wd or 4wd?

 

2006 4wd Screw 5.4L, 8" Lift on 35's and 20" wheels, with Magnacharger supercharger

0-60 6.05 Sec

1/8 9.33 @ 76.7 mph
1/4 14.6 @ 93.3 mph

 

There will always be a 2 mph difference in the Edge readout and the truck speedometer. Ford has that 2 mph built in. But, neither one may be correct. You need to check your Edge with a GPS or do a rollout test to know if it is accurate. What I am saying is that, your Edge could be off by 5 mph and your truck speedo will be reading 2 mph faster than the Edge. Hope that makes sense.

 

nice!

 

Did you get you custom tune? If you want to cross check speed with GPS give me a shout and we can use mine.

 

PM me for further info...

 

wow that 0-60time is crazy with a truck that big

so with a 2001 supercrew 5.4l 2wd stock tires and stock height with a supercharger my times should be much better than yours right

hoping 5 seconds for 0-60 and high 12's low 13's in the 1/4

is that even possible

 

I want to elaborate on what Bluejay is saying here (sorry, Jim). He is absolutely correct in his statement. What is not so obvious, to some people, is that when you enter tire size on your programmer, it changes the PCM, which changes the readings you get on the truck's speedo and the Edge readout. I suppose, to make your odometer accurate, you should play with the gear and tire settings in the Edge until the truck's speedo is dead accurate and then the Edge will read 2mph slow. There is no mechanical speedometer cable anymore! The PCM controls everything!

In my experience though, when the Edge is reading dead accurate, the truck's odometer is also accurate, even though its speedo is 2mph high. So, that's the way I have it set.

Back to the OP's question though, if there is wheel slip, there will be an error.

Consider: Put your truck on ice, floor the trottle and release the brake. The speedo and Edge will read 60mph almost immediately because the wheels will be spinning at that speed. (Wow! Warp factor 4 acceleration)!

And, if you are measuring time to reach 1/4 mile, or 1/4 mile speeds, well, since the PCM sees speed and distance as a function of wheel revolutions, it's going to see a bunch of them on ice in no time at all - again, Warp factor 4.

Yea, I know, we don't do 1/4 mile times on ice, but ANY wheel slip whill give you this kind of error. The speed and time have to be measured from an outside monitor. When does the truck "pass" the 1/4 mile point? How long does it take for the vehicle to be moving at 60mph?

So, if there's no wheelslip, the Edge numbers should be good, otherwise.....

- Jack

 

So are you saying that Raptor05121 was actually getting 232 horse power on his Scan Gauge II?

 

Fifty - if this was directed at me, I don't really understand your reference. My definition of HP is, and always will be, Work/Time, or Force*Dist/Time. A vehicle sitting on a dyno, not moving, develops zero horsepower in that definition. So does a vehicle spinning its tires on ice. I'm not much of a fan of HP figures. I'm much more interested in the torque available over the entire envelope, because that translates to acceleration.

I know YOU know this, but some may not: Torque can be highly dependent on RPM and to get the best acceleration (passing performance) you need to be in the proper RPM range. A bit like "corner velocity" to a pilot - too fast or too slow and you're dead.

Now, if you use the automotive Torque*RPM/5252 definition, where you can measure the torque, and it's above zero as on a dyno, then you can get all sorts of interesting numbers. And, I'm not sure they really mean much. At really high RPM, you can have very little torque and still have great HP - kind of like on ice. Or, in super low, applying huge torque, but at low RPMs, you can again say you're developing great HP. So what?

So, was Raptor getting 232 hp in your post? Maybe, but what does it mean?

- Jack