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Twin Turbo 348

Discussion in '348/355' started by ericnoss, Jan 12, 2011.

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  1. ericnoss

    ericnoss Rookie

    Mar 13, 2006
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    Eric Noss
    #1 ericnoss, Jan 12, 2011
    Hi everyone, so I am toying around with the idea of a twin turbo setup for my 348. I think I have a rough idea of what I would like to do, but just have a few questions and was hoping to see if anyone could shed a little light on the subject.

    Again, all these plans are in my head, but there are a few things I would like to know. First off, I am not doing this for a huge power gain. I plan on running 4-5 lbs of boost, just to make it a little more peppy. I would like to run the stock ecu setup and have a few ideas.

    Also, this might be the worst thing I can say, but I come from a Honda background, and have had sucess with building a few high hp import builds, so I'm not completely ignorant.

    One of the main questions are the MAF's. Can they see positive pressure? Or do I have to run them pre turbo?

    Next is the fuel system. Do you think it is capable of supplying enough fuel to see a few lbs of boost? I plan on starting at 3 lbs, and using two wideband 02 gauges, slowly increase boost pressure in 1lb increments until I feel it is unsafe, and then back it down a little bit.

    Also, there is something in the tuner world called an Apex-i SAFC. Its a a piggyback system that taps into a few wires on your harness, allowing you to modify certain aspects of the fuel maps. They are inexpensive, and are widely accepted in the import community. The important part of it is that it intercepts the MAF wire going back to the ecu, and lets you modify it depending on load and rpm range.

    I know this all seems a little scatterbrain, but this has been in my head since I bought the car 4 yrs ago, and I really want to come up with something that will be fun and reliable. I already have the turbos as they are left over from another project, and they are dying to go on this car.

    If anyone has any info or thoughts that would be awesome. Thanks guys
     
  2. 3forty8

    3forty8 F1 Rookie
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    Apr 25, 2006
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    #2 3forty8, Jan 12, 2011
    Last edited: Jan 12, 2011
    The stock Bosch MAFs can read 20% over atmosphere. You will need to relocate them pre-turbo.

    The stock injectors probably won't cut it. You might be able to get away with using something like Corky Bell's rising rate FPRs with the low boost amounts you plan on.


    You can also reprogram the ECU chips fairly easily. One thing to keep in mind is the head gasket will blow with more than a few pounds of boost, those have to be changed or the compression lowered. You might also want to wire in a knock sensor as more than a few pounds of boost at 10.5:1 compression on pump gas will cause detonation.

    Sounds like a fun project, quite a few guys have successfully run turbos on the 348 - keep us posted!
     
  3. xtcgt

    xtcgt Karting

    Nov 20, 2009
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    Robert Boynton
    #3 xtcgt, Jan 12, 2011
    and if you succeed you can sell me the kit. i am bored with the performance of the car. Currently patiently waiting for the supercharger kit to be done form the 928 clan who have successfully done it to 308 328 and the mondial.
     
  4. ericnoss

    ericnoss Rookie

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    #4 ericnoss, Jan 12, 2011
    Thanks for the great info. I know Vortech makes a nice fmu that they supply with their supercharger kits. I think they are available in 6:1 8:1 and 10:1. I think the 6:1 should be okay. And what would you suggest for upgraded head gaskets?
     
  5. ericnoss

    ericnoss Rookie

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    #5 ericnoss, Jan 12, 2011
    Haha i know what you mean. I love the car to death, but it's the only n/a car that I own, and I plan to change that :)
     
  6. db4

    db4 Karting

    Oct 24, 2009
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    ny
    #6 db4, Jan 12, 2011
    i have driven the 348 twin turbo you will be very pleased ,it made over 500hp on 15lbs of boost
     
  7. JoshECS

    JoshECS Formula Junior
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    #7 JoshECS, Jan 12, 2011
    I had the opportunity to assist the build of a 348 twin turbo a while back, it was a phenominal car.

    We did a full rebuild with Carillo, JE and Ferrea internals accompanied by a full stand alone ecu and staged injection, however.

    Most guys that boost these types of cars and don't want to get that deep into it do a "piggyback" to drive additional injectors and modify ignition timing. It's easier and less costly than modifying the original tune...not to mention you don't mess with the off boost drivability and cold start etc etc.
     
  8. ericnoss

    ericnoss Rookie

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    #8 ericnoss, Jan 12, 2011
    I know exactly what you mean. When I first built my drag Honda, I went with a full stand alone system, and an simple one at that. BIG MISTAKE I mean it went great and made tons of power, but it had no provisions for cold start, idle air control, or no open loop operation. Good for racing, bad for driving. I am actually going back to a stock harness with a chipped factory ecu. Going to be awesome
     
  9. ericnoss

    ericnoss Rookie

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    #9 ericnoss, Jan 13, 2011
    You wouldnt happen to have any pictures would you?
     
  10. db4

    db4 Karting

    Oct 24, 2009
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    #10 db4, Jan 13, 2011
    Last edited by a moderator: Sep 7, 2017
  11. ericnoss

    ericnoss Rookie

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    #11 ericnoss, Jan 13, 2011
    Isn't that the Norwood car?
     
  12. INTMD8

    INTMD8 F1 Veteran
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    #12 INTMD8, Jan 13, 2011
    I would not use an FMU, or rising rate fuel pressure regulator. Well, not if you want the air fuel ratio to be anywhere close to correct that is.

    What turbos do you have?
     
  13. speedy

    speedy Formula Junior

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    #13 speedy, Jan 14, 2011
    Yes, it's one of them.
     
  14. JoshECS

    JoshECS Formula Junior
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    #14 JoshECS, Jan 14, 2011
    The only pictures I have of that car are exterior only. I do have some pictures of a second car built by the same guy that I can send you.

    PM me an email address.
     
  15. SpecialK43

    SpecialK43 Karting

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    #15 SpecialK43, Jan 14, 2011
    Last edited: Jan 14, 2011
    I've always used a 1:1 FPR on all the turbos cars I've been a part of building. Is there something special about the fuel management system in question?

    Edit: I now see you are referring to his idea of a 6-8:1 FMU. In that case, I completely agree.
     

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