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TBI and Blow-through help please

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Old Aug 23, 2007 | 06:28 PM
  #1  
shinobi-x's Avatar
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From: santa maria,ca
Car: 69 chevelle & 84 corvette
Engine: L83 350 & 355/142 Blower
Transmission: 700R4/ATI TH-350
Axle/Gears: 3.07D36/3.73 12bolt
TBI and Blow-through help please

would like to know whos been successful with a TBI and a centrifigual supercharger set-up. Any help we be appriciated on a build up of fuel system mods and ECM mods.
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Old Aug 23, 2007 | 06:47 PM
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From: Baltimore, MD
Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
Re: TBI and Blow-through help please

you'll want a new fuel pump (255lph) www.autoperformanceengineering.com is the cheapest around for Walbro pumps. I'd get the holley 670 throttle body (I think its 502-6) with the largest injectors you can get (it has an adjustible fuel pressure regulator too). A 4bbl TBI setup would be even better/ideal.

Most importantly you'll need engine management that can compensate for boost. The least invasive setup for you would be the "new" EBL system from DynamicEFI.

Back when I was planning my turbo TBI project it ended up being cheaper and easier to switch to TPI, but that's not really the case these days.
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Old Aug 23, 2007 | 07:08 PM
  #3  
shinobi-x's Avatar
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Joined: Aug 2007
Posts: 43
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From: santa maria,ca
Car: 69 chevelle & 84 corvette
Engine: L83 350 & 355/142 Blower
Transmission: 700R4/ATI TH-350
Axle/Gears: 3.07D36/3.73 12bolt
Re: TBI and Blow-through help please

ttypecamaro,thanks. I was gonna use a 7747 ecm instead of my stock 84' crossfire ECM? Would a 7747 ecm give me what I want? I have the same components in mind as a TBI but will be using CFI instead. Im piecing together everything and want to know the best route to take. Im open for suggestions and any help.

I just wanted to keep it CFI due to its underdog apperance and character
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Old Aug 23, 2007 | 08:07 PM
  #4  
ttypecamaro's Avatar
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From: Baltimore, MD
Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
Re: TBI and Blow-through help please

The 7747 alone does not have the ability to compensate fuel in boost conditions, but the EBL can be installed in the 7747 ecm with a 2BAR MAP sensor to add boost tuning capability. I don't know much about crossfire injection, but you want to make sure you have large enough injectors to support your power goal with the supercharger.
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Old Aug 23, 2007 | 09:10 PM
  #5  
shinobi-x's Avatar
Thread Starter
Junior Member
 
Joined: Aug 2007
Posts: 43
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From: santa maria,ca
Car: 69 chevelle & 84 corvette
Engine: L83 350 & 355/142 Blower
Transmission: 700R4/ATI TH-350
Axle/Gears: 3.07D36/3.73 12bolt
Re: TBI and Blow-through help please

I can use 90lb inj just like you guys can. No different. The 7747 is a popular swap for the CFI cars because its tunable unlike what we have stock.

The hard part isn't fitting the head unit and shuffling around accesories but the fuel and ECM are hurting me on this car.

So....7747 isn't out of the picture and EBL + 2 Bar map is most doable and in order. Where do I search or who do I go to for more info on this?

Thanks again and all help is appriciated.
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Old Aug 23, 2007 | 10:03 PM
  #6  
ttypecamaro's Avatar
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Joined: May 2005
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From: Baltimore, MD
Car: 09 Cobalt SS Sedan. 92 Z28 vert
Engine: 2.0T EFR6758; 5.0TT T3/T4 8psi
Transmission: F40; 700r4
Axle/Gears: 3.76 LSD; 3.23 posi
Re: TBI and Blow-through help please

look on the DIY PROM board and dynamicefi website for more information. "RBob" of TGO sells and suports the EBL.
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Old Aug 24, 2007 | 12:47 AM
  #7  
shinobi-x's Avatar
Thread Starter
Junior Member
 
Joined: Aug 2007
Posts: 43
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From: santa maria,ca
Car: 69 chevelle & 84 corvette
Engine: L83 350 & 355/142 Blower
Transmission: 700R4/ATI TH-350
Axle/Gears: 3.07D36/3.73 12bolt
Re: TBI and Blow-through help please

i messaged him via E-mail. Thanks for the heads up. I hope to check out his stuff. Looks like the way to go!
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