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348 dyno

Discussion in '348/355' started by QSA, Jul 27, 2019.

  1. QSA

    QSA Karting
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    Jun 3, 2011
    246
    Kingwood, TX
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    Quinn
    Did two dyno runs today to get a baseline before some upcoming mods (and just for fun).

    Made almost exactly what I expected:

    254 rwhp @ 7,250 rpm
    199 tq @ 6,070 rpm

    Car is stock other than cat bypass and Superformance exhaust.

    The a/f ratios were taken on different exhaust outlets each run.

    Attached is a picture of the printout; I’ll post up the electronic when I receive it.

    Video below.






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  3. ernie

    ernie Two Time F1 World Champ
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    Nov 19, 2001
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    Looking forward to seeing the gains you get.
     
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  4. Ferrarium

    Ferrarium F1 Rookie
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    Jul 28, 2018
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    Eric
    Cat bypass and Superfomance exhaust, no chips is that right?
     
  5. QSA

    QSA Karting
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    Jun 3, 2011
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    Quinn
    Correct.
     
  6. paulchua

    paulchua Cat Herder
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    Jul 1, 2013
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    Paul Chua
    thank you for posting this, I love these sort of threads. Very much looking forward to your results.

    Cheers
     
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  8. PineChris

    PineChris Formula Junior

    Apr 17, 2013
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    What mods are you planning?
     
  9. QSA

    QSA Karting
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    Jun 3, 2011
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    Kingwood, TX
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    Quinn
    Standalone ECU - right now Electromotive, but plan to have a few more conversations with reputable/experienced tuners, so I could change my mind. Running the EFI and ignition off the current 60-2 trigger with a single hall sensor sounds good.

    Individual throttle bodies (ITBs) - would like to use 355 ITBs, but the price of these has gone from $600 +/- a set to double or more; they aren’t worth that, as there is very limited uses for these. They are a little too big for the 348 (even with head work/cams), but if I could get a set for a realistic price I would make them work. If not, will likely do Jenvey. Still haven’t ruled out motorcycle ITBs, but there would be more work in the custom flange/connections that have some negatives.

    Head work/cams - maybe. When I get the engine out and inspect, what I find will drive this decision; basically if a head needs to come off for anything then it’s getting sent out for porting and larger valves.

    The above are the only mods planned that would affect the dyno numbers. I’m planning some others.

    My intent is more to have fun with it, and simplify the car some rather than hit a power number. I would expect maybe 10-15 hp with the ecu/tuning, another 10-20 adding the ITBs, and maybe even another 30-50hp with some head work.
     
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  10. ernie

    ernie Two Time F1 World Champ
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    You will be pleasantly surprise by the power gains you make from the ITB's & tuning the stand alone ECU. You'll want to get a good set of after market headers too.
     
  11. vjlax18

    vjlax18 Formula Junior
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    May 12, 2014
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    John
    This is exactly what I wanted to do with my car and exactly why I bought 355 ITBs and plenums a few years ago. Now with a third kid, I have zero time, energy, and disposable income to tackle the project. The parts are just taking up space in my garage and I'd love to see them going to the project that I wanted to take on in the first place. Make me a reasonable offer if you want them.
     
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  13. QSA

    QSA Karting
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    PM sent.
     
  14. KMR968Turbo

    KMR968Turbo Formula Junior

    Nov 11, 2007
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    Calgary, Alberta
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    Erik
    There was a Momo livery race car at the FCA event at Laguna Seca a few years ago that had a modified 348 engine. If I remember right it was a Nissan chassis and the engine made 500 hp. Not sure what was done to get that power level. Was owned by a father and son team from Florida. Nice guys and we had fun on the track with them.
     
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  15. ernie

    ernie Two Time F1 World Champ
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    Nov 19, 2001
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    It ran in the IMSA series on a Spice chassis, back in the '90s. The F119 is one potent little engine when it is allowed to breath properly.

     
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  16. SoCal1

    SoCal1 F1 Veteran
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    Jun 14, 2011
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    Tim Dee
    I have the ITB setup for the 348, it needs more clearance on the rear deck, no biggy. Just need to get adapter plates made
    Slight headwork, ITB's, cams should put you in a nice place.

    I don't have a spare 348 motor but enough parts for couple 355's. I will throw one of them in the 348 then start machining that after its out. Maybe aftermarket heads with X ITBs
     
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  17. SoCal1

    SoCal1 F1 Veteran
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    Jun 14, 2011
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    They go much faster when you get them out in the air :)
     
  18. KMR968Turbo

    KMR968Turbo Formula Junior

    Nov 11, 2007
    942
    Calgary, Alberta
    Full Name:
    Erik
    Here is a video of my 355 Challenge at the track with the Momo car. It arrives at about the 1:20 mark and is in most of the video. They were having some issues with the car (electrical and suspension I believe) and it eventually broke down. Otherwise I am sure it would have left us for dead.

     
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