| [GMCnet] Fwd: Fitch go-efi 4 on Olds 455 in GMC motorhome [message #290299] |
Fri, 13 November 2015 14:43 |
glwgmc
Messages: 1014
Registered: June 2004
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> From: Gerald Work
> Date: November 13, 2015 at 12:36:45 PM PST
> To: Gmc Forum
> Subject: Fitch go-efi 4 on Olds 455 in GMC motorhome
>
> I recently wrote to the company about the use of this efi on our GMCs and here is their response. It looks very good to me, especially the tight integration to their surge tank. We can feed that surge tank with our stock mechanical fuel pump or with an electric low pressure unit. No tank return required as the low pressure pumps dead head against a float valve in the surge tank just like our stock systems do against the float valve in the carb. The high pressure pump is located inside the surge tank fully submerged. The line runs from the surge tank to the fuel rail and returns back to the surge tank. Slick and it is small enough that it will fit several places in the ram air stream beside the radiator or even in front of it. All it needs is a surge tank vent and that can easily run to the fill vent on the fill tube beside the driver as it only carries fumes and not liquid.
>
> Here is their response and my original questions:
>
> Jerry,
>
> Thanks for your question. The EFI systems doesn't care what motor it's on
> let alone how heavy the vehicle it is. We won't claim any fuel economy
> improvements because that is also dependent on your trans and gearing.
>
> The EFI will bolt to a Quadra Jet intake but it may need an adapter plate to
> seal the outside edge. It all depends on how thin the outside edge of the
> manifold is. The overall height of the throttle body is the exact same as
> your carb. You may also need to do a little working of the air cleaner base
> to make it clear the return port. See the link below for dimensions.
>
> http://www.fitechefi.com/virtualoffice_files/30001.PDF
>
>
> We have the Go EFI systems in stock and the Command Center is a couple weeks
> out.
>
> Thanks!
>
> Sales at FiTech EFI
> Reach us at 951-340-2624 or Sales@FiTechEFI.com
>
>
>
> -----Original Message-----
> From: Gerald Work [mailto:glwork@mac.com]
> Sent: Sunday, November 8, 2015 10:22 AM
> To: sales@FiTechEFI.com
> Subject: Fitch go-efi 4 on Olds 455 in GMC motorhome
>
> About 8000 of us around the world are still enjoying our 73-78 GMC
> motorhomes which used the Olds Toronado front drive system, most with 455
> engines. All the later years came with Quadrajet carbs and HEI while points
> distributors were used in the first couple of years. I am interested in one
> of your EFI units for my 77 455 with HEI. You likely have had several
> owners contact you with similar questions, so sorry if you are having to
> repeat info. I will try to get the info out to the community of owners
> through the internet forums and via presentations at club events to save you
> being bombarded.
>
> Do you have any hesitation in using your product to pull a 12,000 pound
> motorhome instead of a 4000 pound car? If I use the stock cast iron exhaust
> manifolds, where should the bung be mounted relative to where the exhaust
> pipe mounts to the outlet end of the exhaust manifold? Would you expect any
> difference if using headers instead? Based on your experience would you
> expect any change in fuel consumption. These things generally get 8-10 no
> matter what you do! The under floor distance from the intake manifold to
> the bottom of the hatch is severely limited, enough so that GM used a sunken
> intake manifold and an air cleaner that nestled down well over the
> Quadrajet. Would you expect your throttle body to be any higher than a
> Quadrajet carb? I would plan on using your surge tank and pump mounted in
> the cool air stream beside the radiator. Does height relative to the
> throttle body matter?
>
> Thanks for taking a few moments to answer these questions. Do you have
> units in stock and ready to ship?
>
> Jerry
> Jerry Work
> The Dovetail Joint
> Fine furniture designed & hand crafted
> in the 1907 former Masonic Temple building
> in historic Kerby, OR
> http://jerrywork.com
>
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Jerry & Sharon Work
78 Royale
Kerby, OR
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