Blow through carb or FiTech Efi for a Turbo setup

Discussion in 'Small Block Tech' started by Sebambam, Dec 23, 2016.

  1. Sebambam

    Sebambam Well-Known Member

    Hi guys
    I was wondering what you guys run on your turbo setups.
    The FiTech Efi offers a self tuning Power adder option with up to 25psi boost capability..
    (1095-1495$)

    Vs
    A well build BLOW through carb..

    Suggestion...
    Budget minded?
    Tuning wise?
    Bang for the buck?

    Does anybody build blow through Qjets?

    Fuel system will be aeromotive 1000 pump and bypass regulator.




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  2. alec296

    alec296 i need another buick

    Should be pretty decent with efi. I don't know how well a Quadrajet would work with boost since secondary is vacuum operated
     
  3. Sebambam

    Sebambam Well-Known Member

    How about other blow through options based on 4150..
    As i said. Budget is in mind as well...


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  4. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    When finding the price for the blow through carb, don't forget to factor in the chassis dyno tuning session.

    Or the cost of A/F gauge that you should have with or without the dyno tuning. Sounds like a fun project, can't wait to see how it turns out. GL






    Derek
     
  5. alec296

    alec296 i need another buick

    Seems you would save some with a 4150 based.carb. Tuning would be your job so an air fuel meter would be helpful. Would probably want timing retard of some type under boost also.
     
  6. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA


    Doesn't the FiTech have that included in the blow through kit?





    Derek
     
  7. Sebambam

    Sebambam Well-Known Member

    Step retard box is already set.
    Dyno tune would be great...
    Afr gauge is like 150$ i think..

    Dyno and afr would be not necessary wirh a FiTech system since it tunes it self and comes with a sensor already incl. The practical handheld.. Further it can be used anytime without any power adders..

    The convinience of not "tuning" it and the safty of running " well tuned" gives me a lot of positive to think about..

    A good blow through runs 800-1000$ + afr 150 + possible dyno

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  8. alec296

    alec296 i need another buick

    I wasn't aware of fitech having any control of timing Derek. I know the msd atomic does but unaware of any others and none that I know that do change timing according to boost. I know they are working on it but not sure if it's available
     
  9. Sebambam

    Sebambam Well-Known Member

    Yes the fitech got the timing control as well.. And as far as i understand works really good..
    I got a manual msd step retard box but would use the fitech option of course since its convinient..

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  10. sean Buick 76

    sean Buick 76 Buick Nut

    The Fitech pretty much has the carb beat in all aspects, but the rate at which these EFI systems are improving is CRAZY. Wait till you have everything together and the engine running with the turbos hooked up before you buy the EFI as 6 months from now there may be a better system for the money. Look into the "hangar 18 mods" for the holley and you will be able to read about all the mods needed. That being said the Throttle body EFI is sort of like having the downsides of both a carb and EFI. It has the reliance on the computer, and it has the lack of ability to tune the fuel to each cylinder independently. As far as I know there is no knock sensor provision with the Fiitec. My plan is to use the CSU custom blow through carb for now and then in a few years once the bugs are worked out of the EFI systems I will go that way. Things have came a long way in the EFI world but they still need a little bit of time for the blow through applications to get sorted out and come down in price. Sure you can spend $3000 and get a great setup now, but 2 years from now you will be able to get that for $2000 and it will be better. I would build a carb for now, what do you have to loose?

    The CSU carb that I had custom built performs perfectly at all conditions, idle, part throttle, 5 PSI, 20 PSI, cold starts, etc. I could have used a home built carb but the time, and aggravation would have been too much for me it was better to pay the pros to do the carb as it saved time and also dyno $. I feel their carbs are 95% as good as the fitech. There is a stumble at the start of the video and that is just because the engine was not fully warmed up. That is normal with any carb, NA or boosted and it has no choke as the choke would not work with the boost. The windows were rattling because I did not yet put the weatherstripping in after paint, and the front end has since been rebuilt and aligned but other than the stumble at the start you can see the carb runs great:



    https://www.youtube.com/watch?v=qmdHBrNNOpQ
     
  11. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Right there would convince me to step up to the FiTech, isn't it only $1,200? A couple hundo more than the carb alone for a all in one kit, dealers choice.

    What power level are you shooting for? Might as well get the 1,200 HP kit just in case you need more than the 600 HP kit can give you. :Brow: :eek2:




    Derek
     
  12. Sebambam

    Sebambam Well-Known Member

    Yes need to be the 1200... The 600 pa system dont cut it since im over this # even with low boost... And i bet i would want to step it up later anyways

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  13. Sebambam

    Sebambam Well-Known Member

    Good point sean... Yea carb or efi will be last to add... And then maybe even a updated version.

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  14. alec296

    alec296 i need another buick

    The new Holley sniper might be something to check too.
     
  15. Sebambam

    Sebambam Well-Known Member

    as far as i know there is no setup for boost with the Sniper
     
  16. jay3000

    jay3000 RIP 1-16-21

    I think the EFI setup is a no brainer if it actually works as advertised. Should be no problems with cold or hot starts. You should be able to set the timing and fuel curves to your setup.

    What's not to like?

    In theory, it should be cheaper in the long run too.
     
  17. sean Buick 76

    sean Buick 76 Buick Nut

    This fellow Canadian guy has been having great luck with the Fitech throttle body EFI.. He has been running 3 years in the 9s in the quarter mile with a non rebuilt stock 6.0 with just a cam upgrade and a turbo... This is one reason I have a stockpile of 6.0 engines, they are pretty cool. The EFI swap starts on page 8.

    https://www.theturboforums.com/threads/377427-1980-Camaro-LS-TURBO-Swap
     
  18. patwhac

    patwhac Well-Known Member

    Don't forget to factor in the cost of any fuel system mods that might be needed if you go EFI like welding in sump and swapping lines and pump etc. But FITech even has that covered, for another $400 you can get their Fuel Command Center which supports 800HP and can be run off of a stock mechanical fuel pump:

    http://fitechefi.com/products/40003/

    I think that's probably cheaper and way less of a PITA then converting to an electric fuel pump. The other option is something like the pre-built fuel tanks from someone like Aeromotive that already have a high flow electric system installed. But I think they are closer to $1k in cost.

    But it looks like you already have your fuel system purchased or factored in?

    This is exactly the route I plan on taking when I eventually do the twin turbo, low boost 350. By the time I have the money I'm sure the FITech unit will be better in some way!
     
  19. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    I have heard a lot of people having trouble with that command center. On paper it sounds like a good idea, but I have read its nothing but a nightmare.

    On the other hand the FITech units themselves I have read are rock solid.







    Derek
     
  20. sriley531

    sriley531 Excommunicado

    Yep, I've read up quite a bit on these as I'll probably eventually go EFI on the Hulk, and the only complaints I see consistently with the fitechs are not the injection systems themselves but the fuel command centers. People not using those rave about the fitechs setups otherwise.
     

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