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2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Installing a LSA Supercharger on an 2001 LQ4 6.0 engine in my 1999 AWD GMC Sierra RCSB Stepside

Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Jun 12 2019, 1:00pm

So, we also fabricated brackets for the intercooler. In order to fit the intercooler, we needed to relocate the transmission oil cooler. we tried to keep things as close to stock as possible and fabricate in a "minimalist" fashion, so that we could later maintain the truck without a lot of hassle.

Here's the stock cooler setup:

stock_cooler_configuration.jpg


Here's the relocated trans oil cooler:

bracket_fabrication_detail.jpg


Looking at the modified and fabricated brackets from the driver's side of the truck. We spaced the trans cooler outward, and added a rubber base to the existing bracket that the trans cooler used to be bolted to, and riveted an aluminum bumper strip to the back of the brace. The new cooler rests on the "ledge" of this brace, and the aluminum "bumper strip keeps the intercooler off the mounting bolt heads at each end of the factory bracket.

bracket_fabrication_driver_side_view.jpg


From the passenger side:

bracket_fabrication_passenger_side_view.jpg


The two upper brackets are bolted at top, and have self tapping sheet metal screws in the middle, and then bolt to flanges on the each end of the new intercooler. The intercooler slides between the trans cooler and the air conditioning condenser, and is offset to the left to clear the power steering cooler. Here's the view from the front:

bracket_fabrication_front_view.jpg


Unfortunately I did not get a photo with the intercooler bolted in place! I will try to add that later when Justin and I get back to work on the truck (not this weekend, though!)
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby ronb256 » Jun 14 2019, 5:29am

Sounds like you have this very well thought out. Can't wait for more.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Jun 18 2019, 7:12pm

I've been working on the design for the fueling system for the truck. The OEM fuel system includes a return line; while the LSA fuel rail is "returnless." I have learned a lot about Pulse Width Modulation, boost reference fuel pressure regulation, vacuum reference fuel regulation, return line pressure regulation, and all sorts of other things I knew nothing about. This is my current thinking of the design for the fuel system:

C3_LSA_Fueling_Diagram.jpg
1999 GMC C3. GM didn't make one, so I did. Soon to be supercharged, thus 1999 C3SC.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby davester3500 » Jun 18 2019, 7:34pm

I'm not sure you can get the flow rate you may need through the schrader valve. I would suggest a splitter just before the input to the fuel rail, with the other port going to your regulator instead.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby MIKE91B » Jun 18 2019, 10:37pm

I’m working on a LSA transplant myself. We are using a vapor werks controller to control the fuel pressure. I’m a bigger fan of a return system myself. The test port will not be big enough to return the fuel. The issue your going to fight is the ECM on that truck does not support returnless fuel pump control. This can cause all types of injector flow rate calculation issues when the intake pressure exceeds atmospheric. It can be compensated for without a boost referenced fuel pressure regulator but I would suggest you run a boost refed regulator.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby silentbravo » Jun 19 2019, 1:23am

You should be able to go through an aftermarket fuel pressure regulator with all your connections. Fuel in, Fuel out to the LSA rail, and then extra fuel out via a return port. No need to tap into schrader (which isn't suitable for this anyway).

Sweet build, going to watch for sure.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1994Vmax » Jun 19 2019, 5:16am

Companies make return style rails for the LSA so you can keep the regulator downstream of the blower. If upstream it's literally just a restriction to flow. My setup is a little different on my 04 which was a returnless truck originally. I put dual 450 walbros in the stock bucket in the tank, 1/2" feed line, 1/2" rails and then used the stock 3/8" feed as a return from the regulator to the tank. It's a TVS 2300 on a forged 370 so not quite the same lol. If I can get an LSA for cheap I want to do one for one of my projects...
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Jun 27 2019, 3:16pm

So, with input from numerous sources (including this thread, thanks!) I've rethought my fueling layout, and have V2.0 designed. The original design was, btw, boost referenced. This design is too, but now the return will come directly from the Aeromotive A1000 Gen II regulator's bypass circuit instead of from the Schrader valve on the LSA fuel rail.

C3_LSA_Fueling_Diagram_Design_2.jpg
1999 GMC C3. GM didn't make one, so I did. Soon to be supercharged, thus 1999 C3SC.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Jul 19 2019, 12:30am

Fuel system installed and pressurized and checked for leaks.

7D5E1C79-1BF0-455D-8921-694A959B8254.jpeg


A6DCAC1C-F974-4F15-9ED7-FABB6E145162.jpeg


36109720-9106-490D-AACD-79E3E05F5D2D.jpeg


Intercooler installed.

369A1F06-0C42-4F3B-B035-B865F6741E9A.jpeg


Air intake tubing from stock air box to stock throttle body fabricated and test installed.

CA089C2E-1D9C-468C-88E6-DFC31B8C86B1.jpeg


Next up: supercharger cooling system completion, PCV system reconfiguration, throttle cable, vacuum lines, sensors, etc, re-routed and hooked up, basic supercharger ECM tune download, and first start.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby silentbravo » Jul 19 2019, 12:57am

Awesome. I may have to use this as a template if I ever go LSA SC. I like how you got the tube into the factory air box.
2001 GMC Sierra 2500HD SLE 6.0 4x4
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Mods: Bilstein 5100s, Airaid M.I.T., Custom LED Fog Lights, Custom Tablet Center Console, Catch Can, E-fans, Backup Camera, Black Bear Performance Tuned
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