Author Topic: Gathering parts for a turbo build. Need some advice  (Read 2590 times)

Offline 1979C20

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Gathering parts for a turbo build. Need some advice
« on: June 12, 2014, 11:10:17 PM »
So here is the motor in my Suburban. http://www.jegs.com/i/GM-Performance/809/19210007/10002/-1?parentProductId=1231165

The only thing that isnt the same on this motor is the heads. It has the stock TBI heads on it. Im tracking down the parts to turbo charge it, either a 76mm turb or two smaller ones, not sure what I can get ahold of yet. Im just  curious, what would you recommend for max boost on the internals listed.
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Irish_Alley

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Re: Gathering parts for a turbo build. Need some advice
« Reply #1 on: June 13, 2014, 12:02:13 AM »
you can get a better motor for 3k
https://www.yearone.com/Product/1967-87-chevy-gmc-truck/ct350pc1
Year One Power Crate 400hp 350 crate engine assembly.
Engine Specifications:
* Horsepower: 400+
* Torque: 400+ ft/lbs
* Compression ratio: 9.7:1
* Dyno-tested: Yes, includes 8" balancer & 14" flexplate
* Dyno sheet: Included with engine's output
* Vacuum produced: 12hg @ 800RPM
* Recommended fuel: 92 octane
* Max recommended RPM- 5800
* Block: Seasoned 4-bolt iron
* Crankshaft: OE cast iron
* Pistons: Hypereutectic
* Connecting rods: Powdered metal
* Camshaft- Hydraulic roller with YearOne proprietary specifcations
* Rocker arms: Stamped steel 1.6:1 ratio
* Cylinder heads: Ported Dart Iron Vortec
* Valves: Stainless steel 2.02 int/1.60 exh
* Valve springs: Heavy duty
* Bore x Stroke: 4.04" x 3.48"
* Intake manifold: Dual-plane aluminum
* Oil pan, timing cover, valve covers included
* Engine fasteners: High tensile strength
* Warranty: 12 mth/12,000 mi
i dont know anything about turbos
If you canít tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline 1979C20

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Re: Gathering parts for a turbo build. Need some advice
« Reply #2 on: June 13, 2014, 09:23:36 PM »
Irish, that motor I listed is the motor that is already in the truck from when I bought it.
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Irish_Alley

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Re: Gathering parts for a turbo build. Need some advice
« Reply #3 on: June 13, 2014, 10:36:24 PM »
lmao oh my bad, continue on then.
If you canít tell yourself the truth, who can you tell it to?~Irish_Alley

When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes

Offline 1979C20

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Re: Gathering parts for a turbo build. Need some advice
« Reply #4 on: June 14, 2014, 09:53:44 PM »
Can anyone chime in on mac recommended PSI? I was thinking 7 pr 8...
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Stewart G Griffin

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Re: Gathering parts for a turbo build. Need some advice
« Reply #5 on: June 15, 2014, 11:56:51 PM »
What's the compression with the TBI heads?

Offline 1979C20

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Re: Gathering parts for a turbo build. Need some advice
« Reply #6 on: June 16, 2014, 05:11:36 AM »
I believe 8.75:1, but it could be 9.1:1.   TBI heads cam with either 64cc or 65cc chambers, so im not entirely sure. How could I test? Compression test?
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Captkaos

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Re: Gathering parts for a turbo build. Need some advice
« Reply #7 on: June 17, 2014, 01:11:28 AM »
That motor is 9.1:1 if it is identical to what you posted.  How do you plan on turboing it?  What are you doing for fuel delivery?
I would cap it at around 5-7 to be safe.

Offline 1979C20

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Re: Gathering parts for a turbo build. Need some advice
« Reply #8 on: June 17, 2014, 05:20:57 PM »
I know I need a larger fuel pump, and I was planning on a vacuum fuel pressure reg.
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline 1979C20

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Re: Gathering parts for a turbo build. Need some advice
« Reply #9 on: August 08, 2014, 03:35:28 AM »
I found a AR.48 t3 turbo off a 88 tbird. Im curious if this would alright?
1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline HAULIN IT

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Re: Gathering parts for a turbo build. Need some advice
« Reply #10 on: August 08, 2014, 06:24:32 PM »
Two of them would be the beginning of something, one? No way! 

Offline Captkaos

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Re: Gathering parts for a turbo build. Need some advice
« Reply #11 on: August 17, 2014, 01:37:17 PM »
Ditto.  and if you want to feed them carb fuel you need to talk to Lorne.