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Old 03-31-2012, 07:46 AM   #1 (permalink)
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Turbo or sc?

Thinking about putting a turbo on my 2011 silverado 4.3

Wanna run about 6psi. What's a good sized turbo, and should I run an inter cooler? Tune isn't a problem, but will I need a bigger fuel pump

My buddy is a diesel guy so he knows a good bit, he will be helping me.

What all do I need? I have factory electric fan so I have room. What do I do about the turbo manifold? I'm not looking for big horsepower numbers, I want maybe 50-75 extra Hp. Also can it be set up to where you don't hear that gay woosh when I let off the gas? I hate the way the turbo ricer bov sounds

I'm kinda dumb when it comes to turbos. Or is there a supercharged that will fit? I've heard that 96-98 5.7 sc kit will fit on a vortech 4.3 that true?
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Old 04-03-2012, 02:58 PM   #2 (permalink)
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Anyone?
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Old 04-03-2012, 03:05 PM   #3 (permalink)
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get a 5.3 or 6.0
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Old 04-03-2012, 03:16 PM   #4 (permalink)
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Why are you doing this? Do you want more power? Does mileage matter at all?
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Old 04-03-2012, 06:36 PM   #5 (permalink)
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Thought about a 5.3/6.0/6.2 swap but I want something different. Turbo would increase my power and still leave some economy. I want to be at about 275-300hp. About 80-115 more Hp at the most. I'll be towing with it as well. Within my trucks towing capacity of course. It's my tow rig for my k20.

I don't know what turbo to get. Would like it to spool at lower rpms(2500-3ish). But not fall on its face in the higher rpms
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Old 04-03-2012, 07:46 PM   #6 (permalink)
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I would go turbo then. If you are towing with increased power, you will likely need to think about your transmission.
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Old 04-04-2012, 03:51 AM   #7 (permalink)
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Think my 4l60e will hold up? I think that's what it has. They put it behind the 5.3 with 325hp. I know fi is a little more harsh on your drivetrain
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Old 04-04-2012, 06:04 AM   #8 (permalink)
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Also what do I need for a turbo set up. Intercooler needed for 6-8psi? Should I buy a kit for a 5.3 and mod it to work? Or start from scratch? The lot I was looking at is this

http://ststurbo.com/gm_trucks
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Old 04-04-2012, 08:47 PM   #9 (permalink)
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http://www.pirate4x4.com/forum/showt...205&highlight=

Check out this thread. I know that jpfrk2001 used a Jeep engine but all the principles apply to your engine as well. jpfrk2001 also gave me these links to turbo books to check out. http://www.barnesandnoble.com/w/stre...ner/1102224620
http://www.amazon.com/Maximum-Boost-.../dp/0837601606
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Old 04-05-2012, 05:31 AM   #10 (permalink)
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Thanks, that's exactly what I needed. Guess I got Some reading to do
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Old 04-05-2012, 09:12 AM   #11 (permalink)
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Def check out these guys:

http://www.ststurbo.com/gm_trucks

Keeps the smog guys happy, and even have the programmer to take care of your computer, I've used the universal kits on a ton of stuff and always been happy. Most of the time it's even cheaper than junkyard piecing together crap, and an EZ weekend install
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Old 04-05-2012, 01:51 PM   #12 (permalink)
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From my experience of building import cars with turbos, there are a few things you really need to look at. Such as will your stock fuel system supply enough fuel for the increase in air flow. Will your MAF do well with the increase in air flow. Like mentioned before you will need either a chip for your ECU or a SAFC, which overrides your ECU to allow more fuel but does not compensate for timing.

Don't forget you will want an intercooler, and an A/F ratio gauge is not a bad idea also. There is alot more to it then just getting a manifold and slapping on a turbo, plus you will want a fresh bottom end or pistons designed for boost. The ring landings on pistons designed for boost are lower then N/A applications.

The gay woosh is the sound of the blow off valve, which releases pressure when you let off the throttle so that you don't get compressor surge, which can destroy a turbo over time. For 6 PSI I would run a small turbo, basically the smaller the hot side of the turbo the quicker it will spool and reach maximum flow, although for 6 PSI you could run damn near anything a little bit bigger then a 14b.
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Old 04-05-2012, 02:04 PM   #13 (permalink)
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I have a tuner that specifically deals with gm trucks and have that part under control. I'd like to run stock internals til it goes. I think my stock pump should be fine. It's the same as in the 4.8/5.3/6.0/6.2 so it should work. I know I need a bigger Maf and injectors. I'm no exPert when it comes to turbos. So I'm not sure of a good size. T3?t4? Hx35?

Also is there a way to get a bov so it doesn't whoosh(like on diesels)?
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Old 04-06-2012, 11:42 AM   #14 (permalink)
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Most diesels don't have a blow off valve, IIRC it's because of the low RPM's and boost. For turbo size honestly you can run whatever you want. Small turbos spool quick, but max out quicker, big turbos spool later and can support higher RPM ranges.
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Old 04-06-2012, 02:22 PM   #15 (permalink)
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Your standard Hypertech tuner won't know what to do with positive boost, you'll need a specific program and MAP/MAF sensor for that (not bigger, 1bar). Lean=death.

Your fuel pump will probably be OK with 6psi, but you are right on the edge for stock injectors. I'd get a slightly bigger set for sure. Lean=death.

A small turbo is better for you because you're not filling a huge engine, and quick boost rules! T-3/T-4 doesn't describe anything but the housing size.

A turbo that small might not even need a blow-off valve, but yes there are quiet ones too and good for you on that choice
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Old 04-06-2012, 02:31 PM   #16 (permalink)
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Quote:
Originally Posted by Cooter! View Post
Def check out these guys:

http://www.ststurbo.com/gm_trucks

Keeps the smog guys happy, and even have the programmer to take care of your computer, I've used the universal kits on a ton of stuff and always been happy. Most of the time it's even cheaper than junkyard piecing together crap, and an EZ weekend install
Ug no. Rear mount turbos are junk.

Look for a under hood kit. Find a syclone/typhoon shop if you can't find a kit. They had turbo 4.3's. Parts may swap over.

A roots type sc will not fit a 4.3. A centrifugal may fit, but will likely over boost. A pully swap will be needed minimally.
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Old 04-06-2012, 02:55 PM   #17 (permalink)
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Ug no. Rear mount turbos are junk.
Curious to why you think that? Any personal experience? or are you just making a bandwagon assumption because they're different?

Good suggestion on the Cyclone/Typhoon shop, but since those were VERY low production trucks I don't think he'll fine a specialty shop in his backyard, I didn't search though.

How about a Typhoon club? Those guys are nuts about them and might have the low down.
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Old 04-06-2012, 03:03 PM   #18 (permalink)
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Curious to why you think that? Any personal experience? or are you just assuming because they're different?
Where I used to work we had a c5 with the Sts kit. It was a plumbing nightmare, it was expensive, it never made the power of a good sc or front turbo kit. Not to mention road debris would come off the tires right on to the turbos. I know it wasn't to be driven in the rain due to this.

We were evaluating boosted kits on that car and that was a least favorite.
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Old 04-06-2012, 03:11 PM   #19 (permalink)
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I just recalled we had one on our company h2 for a while also. Same issues.
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Old 04-06-2012, 03:31 PM   #20 (permalink)
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If your still considering a sc here's a company with a bolt on kit.
http://www.tbi-superchargers.com/TBI...ercharger.html
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Old 04-06-2012, 05:27 PM   #21 (permalink)
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Where I used to work we had a c5 with the Sts kit. It was a plumbing nightmare, it was expensive, it never made the power of a good sc or front turbo kit. Not to mention road debris would come off the tires right on to the turbos. I know it wasn't to be driven in the rain due to this.

We were evaluating boosted kits on that car and that was a least favorite.
Interesting, We found about the exact opposite. I'm far from a nut-swinger for those guys, but the combo of complete, EZ install, and cheap kept us going back. We only did the silverado trucks though, complete install in under 4 hours! (OBS's ). They even say rain is far from an issue. Oh well, to each there own.

Sounds like the OP wants to junk yard build it anyway.
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Old 04-06-2012, 06:37 PM   #22 (permalink)
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Meh, I'm a fan of roots, I like instant boost. Eaton M-90 or 112, would be plenty for 6 psi on a 4.3. Easily found in boneyards for cheap.

Yeah, it takes some fab work. If a little fab work is too much for you then you are on the wrong forum.
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Old 04-07-2012, 06:17 AM   #23 (permalink)
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Th tuner I meant was a person. He will throw it on the rollers to tune it. Not a handheld job. That kit from Tbi site that was linked. Will it work on a non Tbi motor?
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Old 04-07-2012, 06:19 AM   #24 (permalink)
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Btw I heard bad shit about wynjammers. I tried to email them and never got a reply
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Old 04-07-2012, 09:42 AM   #25 (permalink)
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Th tuner I meant was a person. He will throw it on the rollers to tune it. Not a handheld job. That kit from Tbi site that was linked. Will it work on a non Tbi motor?
Tbi is the company name, the link clearly says its for a CPI engine.
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