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2015 GMC Sierra "Ol' Bue" Sleeper Turbo Build

Regan Menzies
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Regan Menzies Enthusiast

Regan Menzies

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On 4/1/2022 at 1:52 PM, JONBLARC7 said:

Very nice build.  I have the same TSP cam in my L86 with some porting on my heads.  I hope to have boost soon but I just had to pull the engine mysellf from two spun rod bearings.  So I had to spend my boost money on pistons and rebiulding the engine.  It's almost back together.  It's just hard to get parts right now.

 

But hey now I have a new crank with Forged Diamond pistons on stock rods.

 

I'm curious how you like that cam with boost?

Thanks! Oh wow, I'm sorry to hear that. Sounds like my lifter situation. I went ahead and did a full rebuild as well. The ARP bolts and studs aren't cheap. Spent over $1500 on bolts and studs from ARP. Bought every bolt they offered.

 

That's right. You'll have a built engine ready for alot of power.

 

The cam works flawlessly. I was worried about it with boost as well but it really helped spooling the smaller turbo that I had. Now that it's a bigger turbo, it spools a tad slower but I prefer it to not boost at lower RPM's. With the TSP stage 2 cam with the bigger turbo , I begin spooling around 3000 RPM's. I am fully spooled by around 3500 RPM's. 

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Regan Menzies
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I love floor mats. That's always one of my fist things to upgrade. What do y'all think?      

Regan Menzies
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HP Tuners and transmission cooler came in today! Parts are starting to come.        

lucas287
lucas287

With HP Tuners you can just adjust when the existing e-fans come on. Best/simplest solution since you want a colder stat!

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dp454so Enthusiast

dp454so

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Rad build!  I'd love to boost my 6.2 but cringe having that much tube & snail under the truck (but I understand your logic).  I have my truck offroad quite a bit and know full well that I'd crunch something that would shut me down.  

 

Obviously you have the background and skill but what made you go turbo as opposed to supercharger?  

 

Cheers!

CajunFries Enthusiast

CajunFries

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10 hours ago, dp454so said:

Rad build!  I'd love to boost my 6.2 but cringe having that much tube & snail under the truck (but I understand your logic).  I have my truck offroad quite a bit and know full well that I'd crunch something that would shut me down.  

 

Obviously you have the background and skill but what made you go turbo as opposed to supercharger?  

 

Cheers!

There are plenty of options for boosting these trucks. If you off-road a lot, having a PD blower (something like a magnuson TVS2300) would fit nicely. 

CajunFries Enthusiast

CajunFries

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On 4/12/2022 at 1:58 PM, Regan Menzies said:

With the VS Racing Billet 75/65 turbo, it made 505 WHP at only 7 PSI. The graph showed how restrictive the turbo was in the higher RPM's due to the smaller turbine so I swapped the turbo out for a On3 Billet 78/75. I plan on putting the truck on the dyno again this weekend.

What muffler are you running? The turbo sizing doesn’t sound tooo bad but with a baffled or chambered muffler, it’ll act like the turbine side is too small and choke up the exhaust. 
 

what brand intercooler are you running? 

Regan Menzies Enthusiast

Regan Menzies

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On 4/19/2022 at 7:25 PM, dp454so said:

Rad build!  I'd love to boost my 6.2 but cringe having that much tube & snail under the truck (but I understand your logic).  I have my truck offroad quite a bit and know full well that I'd crunch something that would shut me down.  

 

Obviously you have the background and skill but what made you go turbo as opposed to supercharger?  

 

Cheers!

Thank you. It's a fun truck for sure. It tows very well too. Fortunately for me, my truck stays on the road or trails. I don't do any mudding with this truck. I wouldn't do a rear mount turbo if I was using this truck to go into the mud unless I snorkeled the intake up into the rear fender or even better, put the intake through the bed under a bed cover. As for the piping and everything else, if you have never dented your driveshaft or your frame, you won't touch the turbo setup. It is tucked high and out of the way. It really depends what you want to use the truck for. One build will always have its pros and cons. The debate for turbo vs supercharger also depends on what you plan on using the truck for. 

 

I prefer turbo over supercharger any day. The benefit of supercharger is the ability to have boost at any RPM. This is also a con. Having more torque at lower RPM's is harder on engines. Supercharger consume alot of HP to make HP. Therefore, Superchargers will also get worse MPG.

 

With turbo, you are using energy that your engine is already producing. Turbo's need higher RPM's to spool up. Once the turbo is spooled, it remains spooled until you let off the throttle. If you're driving on the road at 40 mph and floor it, it may take about a second to spool back up. Even with a rear mount 78/75, I am fully spooled at 3500 RPM.

 

I would only supercharge for ease of installation or all out drag racing.

Regan Menzies Enthusiast

Regan Menzies

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On 4/20/2022 at 6:34 AM, CajunFries said:

What muffler are you running? The turbo sizing doesn’t sound tooo bad but with a baffled or chambered muffler, it’ll act like the turbine side is too small and choke up the exhaust. 

My exhaust after the turbo is an inch bigger than the turbo outlet and it's only about 6' long. I am using a Magnaflow straight through 4" In & Out. The turbo wasn't small if I wanted to keep it under 4500 RPM's. It's the smallest turbo that I would recommend for a 5.3. The exhaust side was choking it. Now the truck is a different animal but I'm still keeping the boost around 6 PSI to keep it at 500 WHP to keep my trans from slipping. 

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Regan Menzies Enthusiast

Regan Menzies

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On 4/20/2022 at 6:34 AM, CajunFries said:

what brand intercooler are you running? 

It's an off brand delta core. I chose delta core because I've seen many reviews and tests that have proven them much more efficient than flat plate.

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