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Twin turbos

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Old Aug 6, 2009 | 09:11 PM
  #1  
hotrod78's Avatar
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Joined: Apr 2007
Posts: 61
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From: Fall River , MA
Car: 1986 Trans-Am
Engine: chevy 350
Transmission: TH350
Twin turbos

whats up guys , I was wondering if you guys can help me out. I'm going to be running twin turbos on a chevy 350 motor.I modified my edelbrock 750 carb for a blow thru setup.I was wondering what would be the best (Step-up)metering rods , needle and seat,Primary metering jets,and secondary metering jets for my application.Here's the info on my motor

Turbo:twin T3/T4 hybrid
57 compressor wheel trim mapped for low & high boost setups
wet float bearings & properly balanced
3" inlet diameter with a 2" outlet
.50 A/R compressor housing
.63 A/R turbine housing
1/8 NPT oil inlet
T3/T4 hybrid

Crankshaft : Stock

Pistons : stock

Connecting rods:stock

Intake manifold:Edelbrock performer

Carb:Edelbrock 750

Heads:cast iron

Camshaft:COMP Cams 12-210-2 - COMP Cams High Energy Camshafts

Cam Style: Hydraulic flat tappet

Basic Operating RPM Range: 1,500-5,500

Intake Duration at 050 inch Lift : 218

Exhaust Duration at 050 inch Lift: 218

Duration at 050 inch Lift: 218 int./218 exh.

Advertised Intake Duration: 268

Advertised Exhaust Duration: 268

Advertised Duration: 268 int./268 exh.

Lobe Separation (degrees) 110

Intake Valve Lash 0.000 in.

Exhaust Valve Lash 0.000 in.

Computer-Controlled Compatible No

Grind Number CS 268H-10

Lifters: COMP Cams 812-16 - COMP Cams High Energy Hydraulic Lifters

Rocker arms: COMP Cams RP1412-16 - COMP Cams Magnum Rocker Arm Kits
Stud Mount, Roller Tip, Steel, 1.52 Ratio,

Timing Chain: COMP Cams 2100 - COMP Cams Magnum Double Roller Timing Sets
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Old Aug 6, 2009 | 09:19 PM
  #2  
junkcltr's Avatar
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Joined: Jan 2002
Posts: 4,432
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From: garage
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: Twin turbos

Not many people use the Edelbrock carbs for blow thru. You best bet is to search www.theturboforums.com. I think a few use that carb there.

Who makes those turbos? They sound like ebay T4 46 trim turbos by the specs.......but the you listed them as 57 trim. I think that cam is a good choice.
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Old Aug 6, 2009 | 09:25 PM
  #3  
hotrod78's Avatar
Thread Starter
Junior Member
 
Joined: Apr 2007
Posts: 61
Likes: 0
From: Fall River , MA
Car: 1986 Trans-Am
Engine: chevy 350
Transmission: TH350
Re: Twin turbos

Thanks buddy, for your help.Those turbos were bought on ebay.The guy that sold it to me said that they were 57 trim.But i think your right ,are those turbos any good
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Old Aug 6, 2009 | 09:48 PM
  #4  
junkcltr's Avatar
Supreme Member
iTrader: (1)
 
Joined: Jan 2002
Posts: 4,432
Likes: 1
From: garage
Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: Twin turbos

Sorry I couldn't help more on using the Edelbrock carb. Most I see are using the Holley double pumper. There was 1 or 2 smart guys on that other forum talking about metering rods and stuff before.

Some people like those turbos and some hate those turbos. People have been running them successfully for years and some have problems with them right out of the box. So it is tough to say. Together they flow enough for about 800 fwhp so you shouldn't have a problem there.
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