I took my truck to a DynoDay today. My truck only has a muffler, K&N filter, and Wheatley mail order 87 octane tune. It was on a Mustang Dyno set to Dynojet settings, but I think they were a bit screwed up. Plus, since I've got 3.23s, I only used 2nd gear. I tried it with and without tow/haul mode.

It put down 255hp@5248 & 274tq@4043 without tow/haul and 249hp@5411 & 271tq@4074 with T/H on right after. The difference might be a little heat soak or maybe there are different TM between?

I started the pulls at about 2000RPM and held it to 6000. Torque was just over 250 from the start and horsepower didn't drop much at all until 5800.

I honestly expected a little more out of it since the factory engine rtings were 295hp/335tq at pretty much the same RPMs as what my peaks were.

 

Remember thats crank rated HP and TQ from the factory...your seeing the numbers through the drivetrain...i don't think its to bad at all!

Dustin

 

I definitely understood that. The Horsepower number seems about right, but the torque is what seems low to me.

 

I couldn't complain about that myself coming from a stock truck....

 

I'm not really trying to complain. These are my "before" numbers anyway

 

 

would anybody like to guess what it would pick up if Wheatley retuned for premium fuel?

I've upgraded the intake tract since my last time on the dyno.

When I get new tires, I'm planning on going back to the same place to dyno it again in 2nd and then 3rd gear. It seems like most trucks that have broke/twisted/thrown/etc driveshafts had the long aluminum shaft and 3.73 or steeper gears. With my gearing and tire size, it looks like my tires would end up turning around 170mph at 6000RPM in Drive.

 

anybody? Is it worth the shipping costs to send back and forth?

 

D_reks{5.3} Trucks did 167mph at 6k