OK, we know that the 2002 HD is de-tuned to 340hp. However, my question is how did Ford accomplish that Would a chip overcome it, or is it in the hardware (cam, crank, valves, etc)

What do you HD owners thing ?

 

I heard pullies and chip, but anyone would have changed those anyway. I wonder if you could get the chip and pullies from the factory that were put on the L.

 

I'm told the only difference is the pulley on the S/C. Almost all Lightning mods will work on an '02 H/D. Check out www.powersurgeperformance.net for mods, he has about everything.

G

 

Truck Trend's article mentions that a slightly smaller air intake in the lower valance for the intercooler is responsible for some of the detuning, also. Again, nothing a bit of tinkering wouldn't fix.

 

You can get the exact de-tuning information if you contact Roush. Roush was hired to dot he de-tuning and they will let you know the exact parts to get it back up to par.

 

Here's the explanation from the 02/03 Motor Trend.

a. Smaller intercooler grill opening = less cooling potential

Altering this would require new front bumper or possibly adding electric cooling fans

b. Full length vehicle exhaust.

Remedy: reduce exhaust length or install new muffler.
Caution:!!! More than a few Lightining owners (myself included) suffered some perceived loss of low end torque after installing a hi flow exhaust.

c. Larger intercooler pulley= turns slower less boost.

Change the intercooler pulley however the upper pulley can be tricky to R&R. Lower pulley change seems more common. But what about the belt size???

Interestingly - no mention of computer detune

There you have it folks

Regards
Frank