Ryan42680,

I can't attest to the numbers you will see from an email tune, but with Hypertech's tuning for the 08 F-150 you will see a gain of 25 HP & 40 TQ over stock.

Does anyone know what the custom tuning guys claim on a stock 5.4 truck or one with CAI and exhaust?

 

What is the 'average' stock number on HP and TQ at the RW?

 

Stock ours put down 251 hp & 300 ftlbs, now that is on an AWD Superflow dyno. From what we've seen cars will typically dyno 10% higher on dyno jet dyno when compared to what they put down on a Superflow. That would also be true for a truck that had our tuning installed it should dyno about 10% higher than what we claim.

 

Will the Hypertech have adjustment for CAI? or free flow exhaust? Just curious.. I am about to get a tuner for my '06 5.4.. I already have magnaflow exhaust and an AFe CAI... Up in the air about this new Hypertech or custom tuning.

 

If you had a 2004+ F150 that was putting down that kind of power without any mods than you must have an abundance of freak trucks.

 

I'm absolutely NOT going to start a war here but, that's FREAKISHLY high for a 'stock' truck. I stress the word 'FREAKISHLY'.

I've always thought that the 'rule of thumb' was that there was approximately 100 HP lost across the drivetrain to the rear wheels (so, 300 HP at the flywheel, then around 200ish at the RW stock). As for TQ numbers, I'm not exactly clear on what 'stock' really is in that department...

Your 'stock' numbers seem *very* high though, Darnell. Again, not trying to start a war here... just calling a spade a spade.

 

especially since you're saying that it will actually dyno up to 10% higher. im gonna call BS on that one.

 

I agree whole heartedly, numbers are around the 210-215 rwhp for the most part. . our transmissions/tq converters are robbing us of a lot of power.

 

So I am to believe that I would expect to show numbers around 270-275 hp on a Dyno jet (273 is 10% higher) with JUST the Hypertech programmer??????? I HAVE to agree with everyone else here...that is not just freakishly high, it sounds absurdly high. But of course, I could be very wrong

 

RockPick,

Here is a dyno graph from our 04 F150 w/ a 5.4



The 5.4L motors in 2004 + F-150 are rated at 300HP and 365ft-lbs at the crank. Our truck was an 04 and it put down 251HP and 300ft-lbs at the wheels. That is a loss of 49HP (16.333%) and 65ft-lbs(17.808%).
When dyno testing we install a custom made harness which allows us to force the transmission into a single gear and then lock the torque converter clutch (TCC). This allows us to accurately measure every RPM point on the curve. By locking the TCC it completely eliminates the power loss through the converter (hydraulic slip). Converter slip really skews the power numbers, and dampens the power curve which can hide tuning issues (aka knock). This is the only thing that I can think of that would make our numbers appear higher than what other people put down stock, but this is the correct way to dyno an automatic.

Another to consider when you’re talking about converter slip is how a chassis dyno works. A chassis dyno measures power at the rear wheels and then calculates the torque (or vice versa) by using the engine RPM. HP = TQ * RPM / 5252.113. This method can only be used if there is no slip in the drive train system (Clutch/converter, gears, tire patch). If there is slip then the combined gear ratio between the dyno drums and the engine varies and the calculations are incorrect. In a situation with an automatic truck dyno testing without the TCC locked, the horsepower would measure correctly, but the calculated torque would read lower than what it actually is.

That being said I did find out that I was mistaken when I commented that an 04+ F150 would dyno about 10% higher than the numbers we claim. The confusion on my end came from the fact that Hypertech upgraded its dynos shortly after the tune for the 04 F150 tune was developed and tested. So therefor the numbers for the 04+ F150s came from a dynojet dyno. Thanks for calling me out on that statement because it forced me to go verify my statements and I saw that I was wrong in regards to that one.

 

Darnell....

Will the Hypertech have adjustment for CAI? or free flow exhaust? Just curious..

 

well i guess the 2004 trucks are godly!

what was the build date on the 2004 you guys dyno'd? (august '03, perhaps )

 

Don't get too excited, they all dyno roughly the same. I should be close to 300rwhp according to Hypertech!

 

Here is my dyno using the same method as hypertech...



Darnell: post a screenshot from winpep and maybe i/we will believe you.

 

I guess Troyer, VMP and the others will be closing their doors soon.........