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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] » Jul 19 2019, 2:35pm

Thanks, Silentbravo. It is a little bit of a different build than most people's "max performance" builds. While I know I am giving up "free horsepower" by not using headers, a different cam, low restriction exhaust, and true cold air induction, etc; for me the focus of this build remains oem-like look, NVH levels, and a stealth outward street appearance, plus driving comfort including sound levels and power delivery "feel."

I've had many high performance vehicles, and several of my street projects in my younger years went "one step too far" and became (while measurably faster) basically unstreetable, and ultimately, no longer fun to drive/ride on the street.
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby Bradley21sanders » Jul 19 2019, 6:01pm

1999SierraC3SC wrote: went "one step too far" and became (while measurably faster) basically unstreetable, and ultimately, no longer fun to drive/ride on the street.



Something im trying to avoid with my current project vehicle. I wish I knew what the best all around power to weight was for any given vehicle then it wouldn't be a guessing game.. guess ill just shoot for 500 to the wheels and hope I like it haha

Sweet project truck you got going on!
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Aug 19 2019, 2:47am

My son (Justin) and I completed the supercharger install on my truck and started it this past week. Initial observations:

1. initial rough idle on cold start. Idle smooths out after truck warms up. Idles at 600 rpm after warming.
2. intermittent miss on number 3 cylinder. Justin swapped plugs, fuel injectors, and coils. Miss did not follow any of these items to another cylinder, but remained in number 3. Justin also tested all eight fuel injectors (58psi injectors) and all tested good.

Today I took it out for about a 20 minute test drive. I data logged yhecdrive to send to Black Bear Performance. Conditions were as follows:

1. 95 degrees with 43% humidity.
2. 1/2 tank of fuel; about four or five gallons from the first week in June, with nine fresh gallons added today. All 93 octane pump gas with 10% ethanol.
3. Base fuel pressure set to between 55 and 60 psi.
4. EVAP system disabled. (This is the *ONLY* trouble code from the engine on my son's reader)
5. 195-degree thermostat (did not observe coolant exceed 195 degrees on the gauge.
6. We have not installed a boost gauge, but I think we need to.
7. We do not have an in-cabin fuel pressure gauge (we have an oil-damped gauge in the engine compartment at the fuel regulator) but I think we need one.

Test drive observations follow:

1. At no time did I exceed 50% throttle, per your instructions
2. Truck responds well to small throttle openings in first and second gear. Up-shift to second gear is very early on light throttle.
3. Truck falls flat on its face immediately after the shift to third. This happens whether going uphill or down, with 1/16 throttle, 1/8 throttle, 1/4 throttle, and 1/2 throttle. RPMS fall precipitously, truck does not respond to throttle at all. Maintaining small throttle opening, after 3,4,5 seconds, or maybe even a little longer, the truck comes up on throttle and resumes accelerating.
4. At higher road speeds (50~60mph) the truck seems to drive fairly close to normally; you can feel it pick up throttle and accelerate. I think the highest road speed I hit was 80mph.
5. At small throttle openings and cruising at 50~55mph, initial tip-in of throttle results in audible pinging. I backed off when this happened. Slightly larger throttle opening did *not* seem to cause the pinging.

Data log has been sent off for analysis followed by an updated tune.
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 1994Vmax » Aug 19 2019, 2:44pm

Quite a few guys have no success with the port adapters on cathedral heads while using the LSA blower. They have to have fuel puddling in the adapter especially at lower engine speeds.

Take a read through this thread to see what I mean.

https://www.performancetrucks.net/forum ... -a-551978/
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Aug 19 2019, 4:26pm

Interesting, thanks for the link. First I've heard about this!
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby plato442 » Aug 25 2019, 6:01pm

Yeah first I’ve heard of that too out of what must be many of LSA swaps to cathedral heads. I’m interested to see what you’ve found out. I’ll be doing an lsa swap soon on my 03 Denali, so similar to your current build!
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Sep 07 2019, 2:18pm

Got the new tune back and installed it. The truck runs much, much, better. I’d say the tune feels about 95-97% “spot-on” this time around.

The truck starts, idles, and accepts throttle like a dead stock truck. Other than the intercooler visible behind the grille, there is no outward clue that the truck is supercharged.

Left to do’s are another data logging session (followed by what I hold is the “final” supercharger tune), fabricating brackets for the PCV oil separation system, figuring out why the A/C doesn’t come on, installation of a boost, fuel pressure, and intercooler temp gauge, and a general tidying of the engine bay.

Oh, and for the first time since we started the project on June 8th, the truck is back home!
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 silentbravo » Sep 07 2019, 10:10pm

Where are you putting the gauges? Typical A-pillar install or something else?
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Re: 2001 6.0 Vortec LSA Supercharger Project (1999 Sierra)

Postby 1999SierraC3SC [OP] » Sep 07 2019, 10:50pm

Thinking of using the Banks 3-gauge overhead console. Not a big fan of the a-pillar pods. Not really in keeping with my “discreet” mostly stock-appearance build. The Banks console is less ... obtrusive.
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 silentbravo » Sep 08 2019, 12:22am

That's a pretty good looking gauge pod. If you paint it your interior color it would blend well. SEM makes some really good color matching spray paints for interiors. I repainted my center console with their medium dark pewter and it's perfect match to the rest of the console/interior colors.
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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