LSXR intake

[Brien W]

Has anybody installed a LSXr intake on a 5.3? Parts list for the accessory's? fuel rails, Electronic TB?? Any info would be helpful
Need more power to turn 37's and running 4.56 gears on my 09 H3T

 

[06 H3]

supercharger or turbo...

Cam

Tune

The nice thing with the 5.3 is that there is sooo much aftermarket support for it. 5.13s with the 5.3 and 37s are a bit over geared. 4.56-4.88 should be perfect

 

[High Five H2]

it's on my list, don't know much about it though.

 

[Mr_Rich]

I think the truck manifolds are supposed to breath pretty good for a stock manifold. The biggest night-and-day change you could make would be a cam swap and that means going into the engine beyond external bolt-ons. I noticed someone above did mention it. A cam swap would be cheaper than a supercharger. I'm basing my opinion on my SBC experience since my LS engines have all the power I need.

 

[Ryan212]

The 5.3 is a smaller LSx based motor, Personally I would just swap in a 6.0 or 6.2 or even a custom 400+ cube LSx engine. (427, 454 if you really want power) Or add a supercharger like the Edelbrock E-force or Magnuson TVS1900 or milled heads to raise compression.

Do you need more low end torque or more high rpm power. I would assume more low end grunt for the 37's.

Personally, I have a 6.2 LS3 engine in my garage, if I had an alpha I would swap that in for the easiest power gain. The truck L92 engines can be found for under 2 grand on occasion (used out of Escalades and Denali SUV's) they would make an improvement without the complexity of a supercharger and keep the stock drivability without going to a large camshaft and loose low end torque.

Ryan

 

[Expendable]

An article to consider. it's nearly 5 years old so the prices are probably not accurate and there might be better products avail now.

http://www.trucktrend.com/how-to/engine/1012tr-5-3l-lm7-engine-build/

 

[ReconH3]

That's a very interesting and detailed article. Says a lot about the potential of the engine. The only thing I didn't like was that all the power was in the high revs. When I'm wheeling I rarely get up passed 4000rpm and 90% of the time it's below 3000rpm. I wonder if they have anything on the lower end? There is a mention of other cam options.


"Ex Umbris Venimus"

 

[4speedfunk]

Agree. I seriously doubt if any useful gains would come from a "intake only" swap. Cam, headers, injectors, intake, and PCM tune are more sync'd than ever. I wouldn't mess with the intake unless a few other items were also being swapped. It might even run worse! Big ports create less signal and throttle response could actually decrease on an otherwise stock motor.