Carb to EFI Swap
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Carb to EFI Swap

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    Senior Member Skydog's Avatar
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    Default Carb to EFI Swap

    Hey guys what is the best thing going now for efi and a Whipple blower? Thinking of making the swap? Is there a kit out there that is working great? I have twin 1050s now should be about 1200-1300HP set up on pump and efi what kit?

    Thank you Skydog

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    Senior Member racinjason65's Avatar
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    There are several whipple set-ups. You probably have the top inlet (like a roots) and carb adapter, the kits that come set up for efi have a rear inlet and throttle body. Does your manifold have injector bosses?

    I am looking at the Rootz-EFI kit to replace the carbs on my motor. If your blower and intake are strictly set up for carbs it might be a good option for you to look at.

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    New here Beer:30's Avatar
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    Quote Originally Posted by Skydog View Post
    Hey guys what is the best thing going now for efi and a Whipple blower? Thinking of making the swap? Is there a kit out there that is working great? I have twin 1050s now should be about 1200-1300HP set up on pump and efi what kit?

    Thank you Skydog
    Just to be clear - - you CURRENTLY have a Whipple with carbs? Or are look to switch from a different blower to a Whipple?

    Also, do you have a bung or bungs in your exhaust for oxygen sensor(s)?
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member Skydog's Avatar
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    Wow that kit looks sweet!!! Any more input on it? Is it working real well I have a whipple 8.3. I woulder if this would work great on that?
    Thank u how much???

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    Senior Member Skydog's Avatar
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    Yes have carbs now.

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    New here Beer:30's Avatar
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    Quote Originally Posted by Skydog View Post
    Yes have carbs now.
    We knew you had carbs, was just curious if you were changing/upgrading to a Whipple or if you already had one. I see you have an 8.3, so looks like the ROOTZ kit would be right up your alley. Your current setup should look like the picture on the right??



    Again, do you have bungs for oxy sensors to tune with and or run closed loop? If not, you'll want to get that done first. The bungs would have to be welded into the DRY area of the exhaust - isolated from water.
    Last edited by Beer:30; 09-28-2012 at 06:52 PM.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

  9. #7
    Senior Member Skydog's Avatar
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    Sorry yea I have top entry 8.3 but it is brand new might have whipple do a swap and cash for a rear throttle body. No bungs for injectors not sure on o 2 bungs but could weld them in easy.
    Thank u Skydog

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    Senior Member racinjason65's Avatar
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    Quote Originally Posted by Skydog View Post
    Sorry yea I have top entry 8.3 but it is brand new might have whipple do a swap and cash for a rear throttle body. No bungs for injectors not sure on o 2 bungs but could weld them in easy.
    Thank u Skydog
    The O2 bungs in the exhaust are not that big of a deal. First you need to see where the injectors are placed on their EFI kit, if they go runners of the manifold, you will need the correct one as well. If that is the case it might be really expensive to swap out the blower and manifold that have only been on your engine a short time. Also were you planning on removing the scoop from your engine hatch? If that was your plan than going with the EFI rear entry set up would be the way to go, one of my friends had a 27 Daytona with an almost flat hatch with a whipple 5.0L under it. If you are looking to not mess with the scoop and keep the same basic look, the Rootz set up is about
    1 1/2" shorter than the carbs you have now. If you go with the Rootz set up you have a choice of either Mefi 4 or FAST for the ECU, I perfer the FAST as its much more user friendly hand has a lot more capability but I would consult whoever you plan to use to tune the engine.

    You also want to take a look at your fuel system, going from carbs at 6 or 7psi of fuel pressure to EFI at 40-50 psi will have different needs. Your current pump or pumps may work, but you will need a regulator and a return style fuel system.

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    New here Beer:30's Avatar
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    Quote Originally Posted by racinjason65 View Post
    You also want to take a look at your fuel system, going from carbs at 6 or 7psi of fuel pressure to EFI at 40-50 psi will have different needs. Your current pump or pumps may work, but you will need a regulator and a return style fuel system.
    Another good point. And, one could run all of the new fuel system parallel to the existing system. Just don't hook it up until the EFI is actually installed.

    IF you have dual tanks, you can "T" the return line back into the feed line for the EFI pump. This will push any unused fuel back to the tank you are on - AND - feed the pump with the rest. Plus, this way, you don't have to purchase a 6-port switching valve. That would be plan-B.

    If you have a single fuel tank....the same can be done. You could just plumb it into the intake of the pump / or / just return it to the tank. You could even T into the tank vent.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member Skydog's Avatar
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    First thank u guys, I have two tanks,with two magna fuel pumps. Still not too sure what way to go. Of course money is a big part and then I want a turn ket set up,idle all day start easy when cold. And I want to go E85 and run like 12 psi boost :-)

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    New here Beer:30's Avatar
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    Quote Originally Posted by Skydog View Post
    First thank u guys, I have two tanks,with two magna fuel pumps. Still not too sure what way to go. Of course money is a big part and then I want a turn ket set up,idle all day start easy when cold. And I want to go E85 and run like 12 psi boost :-)
    Then EFI is what you are looking for. It won't be exactly cheap to do the conversion, but you will do it ONCE and be done. So, you don't want to cut corners - per se. Which is why I say you can do a few things AHEAD of time to prepare. Get the exhaust bungs welded in. Then map out / configure your fuel system. At a different time, you can pre-wire the thing by running a harness to wherever you will be mounting the ECU. Ign, battery, ground, fuel pump trigger, fuel pump relay and wiring to where the pump will be mounted. No matter what system you decide on - these items will still be required.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    Senior Member Skydog's Avatar
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    Right on man! The Holley hp has my eye......

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    New here Beer:30's Avatar
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    Quote Originally Posted by Skydog View Post
    Right on man! The Holley hp has my eye......
    The new Holley systems are really top notch. They were way over-due for a remodel and boy did they do it in style. Very powerful units with lots of options.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

  16. #14
    Senior Member Skydog's Avatar
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    So I am thinking Holly HP with injectors under the 8.3 with Whipples rear throttle body!!

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