Are these dyno numbers very low?

[Leo Opalewski]

2010 GMC Sierra CC 5.3L, 3.08 gears. 6l80 trans. Perf. Mods.  Intake, headers, Exhaust, Underdrive crank. 91 Octane tune. Asking if these numbers are low comparing it to others for a dyno.

[CamGTP]

It's probably close to right. If I saw the data log and the tune file I could comment on what I see and offer an opinion on what was done within the tune.

 

The truck probably still feels slow because you added headers to a truck with 3.08 gears. The headers shift the torque curve a little and those gears suck for everything but fuel mileage. Going to 3.73's would be a huge upgrade.

[Leo Opalewski]

So would it be better to put wrapped stock manifolds back on? If I regear, I rather throw a trutrac in the pumpkin. But that gets pricey.

[CamGTP]

The headers are fine. Wrapping stock manifolds wouldn't do anything, there isn't a worry about keeping heat in on a cast steel manifold.

 

A tru-trac is good idea along with different gears. Pretty much it needs different gears to feel faster or it needs a camshaft upgrade to make it faster.

[Leo Opalewski]

Yeah a cam upgrade is out of the question. Pushing 190k on the clock and over 5000 engine hours. Might as well get a new engine before I put 3k into it.

[Leo Opalewski]

Regear to 3.73 is my plan later down the road.