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    • VTT N54 GC turbochargers top 800 whp using DI (direct fuel injection) only

      The N54 motor topped 800 wheel horsepower many times in the past but this is the first time the motor crossed the mark using only the direct fuel injection system. Last month Vargas hit 777 whp so the 800 whp mark looked well within reach.

      More details below from VTT.


      Left the car on the dyno today, and did a few more runs for fun. We upped the boost a little bit, added one degree of timing up to 6K. Voila 804WHP/741WTQ DI only. We knew the turbos had it in them. Great to see it fulfilled!

      Logs here

      AEM to show true boost: http://www.datazap.me/u/vargasturbot...log=1&data=4-5
      MHD for fuel etc: http://www.datazap.me/u/vargasturbot...-24&zoom=33-82






      E90 335
      Forged Rods and pistons
      Stock head
      VTT GC Turbos (http://performance.vargasturbo.com/bmw-products/n54/)
      VTT silicone Inlets
      VTT silicone Charge Pipe
      VTT Custom PCV System
      VTT Crank Breather
      BMS Downpipes
      Custom Dual 3" to 4" exhaust
      Custom LPFP setup
      VTT Double Barrel Shotgun
      VTT/SS HPFP Controller
      Custom tuning by none other than V8BAIT (Justin)
      NGK 5992 Plugs
      M3 rear end swap with 3.15 FD
      DSS Custom Carbon Driveshaft
      Stock 6MT
      PTF Twin Disk Clutch
      100% E85
      NO PORT INJECTION

      This article was originally published in forum thread: VTT GC's break 800WHP DI only started by Tony@VargasTurboTech View original post
      Comments 60 Comments
      1. Milan's Avatar
        Milan -
        what did it make corrected? Your 777 run could have been 800 too if you are changing correction factors
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by Milan Click here to enlarge
        what did it make corrected? Your 777 run could have been 800 too if you are changing correction factors
        We have been leaving everything uncorrected these days. To me it seems more credible to post what the car is actually making with no mathmatical factors changing numbers around. 99% of the time uncorrected yields less power. We just leave everything on uncorrected, and run it.
      1. 135pats's Avatar
        135pats -
        Impressive stuff gents
      1. Sticky's Avatar
        Sticky -
        I need a decent shot of the actual turbos. Who has one?

        Edit, this works:

        Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Promoted to the front page with an intro and some additional details.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Tony@VargasTurboTech Click here to enlarge
        99% of the time uncorrected yields less power
        A lot of people don't understand this.

        Correction factors are for balancing out temps and elevations at various locations. If you dyno in Colorado you will want to post the corrected vs. uncorrected numbers.
      1. AWSAWS's Avatar
        AWSAWS -
        After installing these is there any kind of break in recommendation? Like number of miles and a limit on the boost? Is 500 miles too much?
        I suppose it's a good idea to drive low boost for a while just to let the silicone hoses bed in. The heating and cooling seems to stick them onto metal surfaces so they don't slip off under high boost.
        It's going to be torture to run these things on low boost for any time at all, lol.
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Honestly turbos have no break in period. Crank the car for 20-30 seconds with the injectors unplugged to get oil up to them. Then drive 20-30 miles easy to make sure no leaks etc. After that, let her rip.
      1. Surquhar's Avatar
        Surquhar -
        Wow! That's awesome! Great job VTT! If I still had a 335 I would go for these all day long.
      1. colo_evo's Avatar
        colo_evo -
        Nice work!

        What intake manifold was used during the 800+ runs?
      1. j_hynson's Avatar
        j_hynson -
        Nice job!
      1. Chris@VargasTurboTech's Avatar
        Chris@VargasTurboTech -
        Click here to enlarge Originally Posted by colo_evo Click here to enlarge
        Nice work!

        What intake manifold was used during the 800+ runs?
        Back to the EOS (v1).
      1. Terry@BMS's Avatar
        Terry@BMS -
        Congrats!
      1. Newguy123's Avatar
        Newguy123 -
        That's impressive especially on DI only, congratulations. Amazing the stock injectors can flow enough for 800+whp n54 is quite a motor
      1. bigdaddyaaron's Avatar
        bigdaddyaaron -
        How often do you go through injectors?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Newguy123 Click here to enlarge
        Amazing the stock injectors can flow enough for 800+whp n54 is quite a motor
        It's a product of it being direct injected more than anything. I don't think the injector size has ever been a problem.
      1. martial@mhd's Avatar
        martial@mhd -
        Impressive!

        The n55 from 3-2012 would be blessed with a double barrel solution.
      1. CKI@Motiv's Avatar
        CKI@Motiv -
        Good numbers. Im assuming this is on the built motor since its running 14* up top? Have you tried lowering fuel pressure to see what its capable of or do you have to run it that high?
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by bigdaddyaaron Click here to enlarge
        How often do you go through injectors?
        Not often at all if we keep the car running. What kills these injectors is running them on E85 then letting them sit for extended periods. The Ethanol pulls moisture from the air, and they rust internally. Usually after a month or so of sitting, we have to replace 1-2 injectors. This time we got lucky, car sat for over a month, in the past 3 days we have done over 35 runs between 760-800WHP, not a single run aborted due to fuel misfires, one due to spark blow out. the injectors will last a good long time. They are designed to run at very high pressure.
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by Chris@CKI Click here to enlarge
        Good numbers. Im assuming this is on the built motor since its running 14* up top? Have you tried lowering fuel pressure to see what its capable of or do you have to run it that high?
        Peak power is actually made at around 11-12 degrees, and we see plenty of stock motor people running 14 degrees up top to be honest. So the timing alone is not an indicator of being a built motor or not, this one is built. I would never run this kind of power this frequently on a stock motor, one minor mishap, and its gone.

        As for the fuel pressure, we have learned quite a lot about running big power on these motors DI only, high pressure is all part of why it works. If you cannot hold pressure where you want it, you cannot make this power. Small deviations in pressure show themselves immediately in trims, and AFR's. A lot of the people you work closely with said this wasn't possible, they even made comments about selling me secret "injector tables" that I would need for $5K...Click here to enlarge