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Thread: New Direct-Fit Siemens Deka LS2 54# Injector

  1. #1
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    New Direct-Fit Siemens Deka LS2 54# Injector

    There's a new "direct fit" SD (Siemens Deka) injector for LS2/LS7 vehicles, and the beast flows pretty damn good! At 54# that is approx. 12# more than the LS7 injector. This should supply enough fuel on a supercharged GM application to at least 625 to 650 rwhp Actual, and probably 675 to 700 rwhp on a turbocharged GM application. I think it is the one I will be going with on my '08 Z06 (at least until GM comes out with the upcoming ZR1 injector). I know that Andy of A&A Corvette has used these 54# injectors successfully as of recent.

    Here is some info on them:

    http://www.racetronix.com/M145FM2.html

    Racetronix Part # M145FM2 (Siemens FI11351)

    All tests run with n-Heptane (0.6855g/mL) @ 20oC (+/-1oC), 3.0 Bar (+/-0.01 Bar) (43.5PSI) , 14VDC (+/-0.05VDC), saturated driver wtih RC cutoff. Gas (0.735g/mL) ratings converted at a 1.035:1 ratio.

    Static Flow Rate @ 43.5PSI (300kPa): 46.5 lb/hr = 5.86g/s = 478cc/min (+/-3%)
    Static Flow Rate @ 58.0PSI (400kPa): 53.7 lb/hr = 6.77g/s = 552cc/min (+/-3%)
    Dynamic Flow Rate 2.5ms PW @ 100Hz (400kPa): 11.42mg/pulse +/-4%
    Coil Resistance: 12 Ohms (This high-impedance injector will work with all factory ECM/PCM injector drivers)
    Gain: 0.75
    Spray Pattern: Cone
    Electrical Connector: USCAR (New-style V=EV6 / Oval / LS2)
    Fitted with Viton upper and lower o-rings.
    Grease supplied to lubricate o-rings prior to installation.
    Dynamically flowed and grouped to within 1% tolerance using Racetronix custom injector flow bench
    This injector version is fitted with Viton o-rings for use in factory G.M. LS2 fuel rails and intake.

    Note: Some injector flow rates have been converted from n-Heptane test solvent to 40CFR86.113, the U.S. EPA emission test gasoline. However, n-Heptane is not gasoline and flows in most common injector designs at about a 3 to 4% lower rate than 40CFR86.113, the U.S. EPA emission test gasoline.
    Last edited by RWTD; 11-13-2007 at 02:23 AM.
    Formerly known as RWTD

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  2. #2
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    I'm guessing these will work on a TBSS? Nice find.. Whats with the 46.5lb/hr.. what does a normal setup run for fuel pres?
    2006 Trailblazer SS - Stalled, Cammed, Tuned, Turbo'd, Built, and Stroked.
    Runs on cash, blood, sweat, and tears...... and 93 octane.

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  3. #3
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    The 46.5# is if you flowed the injectors are 43.5psi (3-bar). Since GM systems run on 58psi (4-bar) then the injector actually flows 54#.

    Fords run on 39psi.
    Formerly known as RWTD

    Toys: '22 Tesla Model S Plaid / '20 Chevy Duramax / ?20 Sea-Doo RXT-X (2)

  4. #4
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    For future ref.. the TBSS uses a truck style LS2 shorty injector.. I was told I will need to make fuel rail spacers. Any info on how much will need to be 'spaced' so that the normal ls2 injectors will work?

    Thanks for the fuel press info. Have a good one.

  5. #5
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    Hmmm, what's the dimensions on them? The LS2 injector is already a shorty injector. It's the same size as the SD injectors I liked to in this thread.
    Formerly known as RWTD

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  6. #6
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    I guess it has to do with the truck intake manifold vs the regular ls2 intake manifold. I'll take pics when I man up and do my first injector swap!! Should be tonight..

    Any advice as to what I'd input into hpt to adjust for these new injectors?
    Last edited by Blades; 11-27-2007 at 09:23 PM.
    2006 Trailblazer SS - Stalled, Cammed, Tuned, Turbo'd, Built, and Stroked.
    Runs on cash, blood, sweat, and tears...... and 93 octane.

    2007 Cadillac STS-V - Stock.

  7. #7
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    They are different. I smell like fuel.. I will snap some pictures of the two side by side. Nothing some spacers can't fix.. but the TBSS just has to have these cute little dipshits that are a tiny bit smaller. I am taking a break before I post pics.. Can someone post the #s I would put into HPT for these injs?
    2006 Trailblazer SS - Stalled, Cammed, Tuned, Turbo'd, Built, and Stroked.
    Runs on cash, blood, sweat, and tears...... and 93 octane.

    2007 Cadillac STS-V - Stock.

  8. #8
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    Offset tables are owning my ass. Lean at idle.. Using a C6 E40 PCM offset vs volt vs vac table was a good starting point.. With larger injectors I need to increase/decrease the short pulse adder in the lower areas? Any factory GM vehicles running close to this IFR? Interesting to see the diff between offset tables.

    edit: Funny how the escalade is using a vac offset table yet has no offset table. only vs map (blank) and pressure delta
    Last edited by Blades; 12-03-2007 at 05:04 PM.
    2006 Trailblazer SS - Stalled, Cammed, Tuned, Turbo'd, Built, and Stroked.
    Runs on cash, blood, sweat, and tears...... and 93 octane.

    2007 Cadillac STS-V - Stock.

  9. #9
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    How long are these injectors? i.e. Any idea if these would be a direct fit on a 2.4L Ecotec (Solstice, Sky, Cobalt)?

  10. #10
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    Bump

    Does anyone know the length of these injectors? Just wondering if I can use them on a Solstice/Sky without any issue.

  11. #11
    I have these injectors in an LS7. You'll need about a 1/2" spacer. I picked up some nylon spacers at Lowes. Perfect fit. You'll also need longer bolts.

  12. #12
    Senior Tuner Ben Charles's Avatar
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    Bump

    Customer has these injectors, anyone have the correct data??
    Thanks, Ben

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