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Old 12-30-2014, 08:36 PM   #1
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Truck horsepower

What is the best way to improve the horsepower on my 2002 Chevy Silverado 3/4 ton 6.0 engine? Only has 31,000 miles on it. I'm pulling a 2014 Flagstaff 8528 RKWS.

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Old 12-30-2014, 09:17 PM   #2
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That's a tough one. Some people will recommend tuning software or exhaust modifications. Unfortunately, those are expensive alternatives for modest gains. And I think that what you REALLY want is increased torque. Some of the engine mods can actually work to reduce torque.

What is your rear axle ratio? Perhaps the truck could be geared down a bit. But if you are already at 3.73 or 4.10, there isn't any room there either.

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Old 12-31-2014, 01:39 AM   #3
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Tuner won't do much for gas motor. Air Intake and exhaust is about all you can do..I don't think the power increase will be worth the money.

Your Rig is a low mileage rig to say the least and you can get top dollar for it. You could consider selling and getting a diesel where Tune mods make a big difference not only in motor but shifiting as well...
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Old 12-31-2014, 06:19 AM   #4
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I would say it depends what you want to spend.

cam, ported heads, headers and exhaust will get you a good increase. look at the edelbrock e force super chargers too!

if you arent looking at spending alot (10k) dont waste your money on tuners.
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Old 12-31-2014, 07:20 AM   #5
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What a lot of people do is a mistake, free flowing exhausts etc might increase upper rpm horsepower but it will be at the expense of torque.
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Old 12-31-2014, 07:55 AM   #6
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Torch is spot on regarding exhaust and torque. This is especially true for the GM 6.0 on your truck which is an LQ4, a version of the LS engine.
I have the same in my 2006 2500HD and am pretty impressed with it in the stock setup.
I just sent my ECM out to get reflashed by Black Bear Performance. Along with my added cold air intake, I'm expecting a 50 hp gain in the low to mid rpm range. These engines are severely detuned by the factory to meet emission standards, so there is much to be gained with a proper tune. The tune includes reconfiguring the transmission settings for better torque management as well.
A pretty good investment for the money IMO.

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Old 12-31-2014, 07:56 AM   #7
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I have had to delete several threads that had no reference to the the OPs question. He specifically asked about a Chevy engine.....not Ford, not Dodge.

Let's keep the thread on track with Chevy answers.

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Old 12-31-2014, 09:41 AM   #8
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I was never impressed with my 2006 6.0L. While it had power, I thought it was lacking by today's standards, with only a little over 300hp. My biggest complaint was in the transmission though. Always searching for a gear, and while it had power to pull, the transmission was constantly downshifting, and high revving the engine, which drove me crazy. Pulled my 7200lb TT one season with it before I traded it in. I do believe you could do some valve work and tuning on the trans to make it better, I had great results with Level 10 upgrades in the past. Getting the power to the ground has better results than increasing the power.
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Old 12-31-2014, 10:37 AM   #9
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Don't know what the ratio is in the rear axel but have you thought about lowering it?
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Old 12-31-2014, 10:48 AM   #10
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I'm surprised that you're unhappy with that combo...I had the same floorplan in a Rockwood and towed it for 2 years with a Hemi Ram and I was adequate for power.

What you really what is increased torque...lower RPM even better. Increased horsepower usually increase torque too but usually increases the RPM which peak torque occurs. Increasing the axle ratio has the same effect as increasing the engine torque and would be relatively inexpensive unless you have a 4x4. If you're thinking that you need more power to be able to maintain speed regardless of the grade, you should probably change that expectation.



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