Posts by Airborne

  • Haltech ECU

    Kyle D Great video!


    I might be the Lone Ranger on this... But I'm working to eliminate ABS module, 2 if not all 3 wheel speed sensors (depends if I want the Haltech GPS), Brake Pressure Sensors, EVAP Sensor and excess Power Steering wires.


    When I disconnect the ABS Module, the engine will not run. Note the 2 dozen micro-controller pins on the ABS Module. X(


    And the Power Steering will not work if you disconnect all 3 wheel speed sensors. Need to bypass that also. :/

    There should only be two wires for the Power Steering to operate (+12V and 0V)... maybe. Haltech to the rescue?!


    I shorted the Brake Level Sensors at the micro-controller, to remove the sensors.

    Now I need to measure the Brake Pressure Sensor/Switch to see what is needed to eliminate those.


    Kyle D  Dave@DDMWorks  rabtech or anyone who has played with this stuff?

  • Haltech ECU

    Is anyone running the Haltech ECU?


    What functionality is lost in the ECU upgrade?

    Does the ABS or Power Steering communicate with the ECU?

  • 2019 SLR wont start

    r3ap3r I had my Clutch pedal connector disconnected, which caused the same issue.


    P.S. If you connect spare wire from Starter Solenoid Terminal (smaller of two connections) to Battery 12V + it will verify the Starter is good, but I think the starter is good. Caution: Be careful, and don't have the vehicle in gear :) Again Starter is probably good...

  • Fuel Pressure

    ARM  Dave@DDMWorks  Kyle D

    I'm glad to have all of this expertise from the Pros. :)


    At this time I'm willing to give up some HP, to avoid E85 or Haltech's Flexfuel. ARM  Kyle D I am aware of some E85 benifits from experience.


    I think we can all agree 450whp might be possible on 93 octane. I might even be OK with 425whp on 93 octane, before switching to water/meth injection, E85 or additional boost.


    Dave@DDMWorks Thank you for the 15-20psi boost recommended threshold for switching to manifold pressure referenced fuel pressure regulator (MPRFPR).

    ARM  Kyle D I am aware MPRFPR is not mandatory, but I think it will help with tuning and idle smoothness. Perhaps a personal preference... :)


    You guys/gals are great! :00000430:

  • Transmission HP Limit

    Anyone ever seen the HP limit of the transmission?

    Or heard of the transmission gears giving out?


    Wondering if I should stay away from sticky drag strips, with a 4th wheel limited slip diff/500whp/track clutch. ;)

  • Fuel Pressure

    Dave@DDMWorks

    Any recommendations on the fuel system components to match 26psi boost? I don't think there was anything posted on the website.

    I'm assuming Rabtech was running 511whp on 93 octane, considering the 80# injector, if I'm putting the puzzle pieces together correctly. :)

  • Fuel Pressure

    Kyle D Definitely some golden info in there. Thank you!

    (FUEL) Regarding manifold pressure referenced fuel pressure regulator, I believe as manifold pressure increases then fuel pressure differential across the injector decreases.


    Example:

    Provided 60psig = 74.7psia and estimating maximum 26psig boost

    (NA) 74.7psiaFuelRail - 14.7psiaManifold = 60psiaInjectorDifferential

    (Boosted) 74.7psiaFuelRail - 40.7psiaManifold = 34psiaInjectorDifferential

    Although injector pressure differential is not super linear with respect to flow vs pressure changes. Assuming a linear relationship, we might need bigger injectors with 76% greater flow rating to achieve the same job, without the application of a manifold pressure referenced fuel pressure regulator.


    I think ECU tuning injector pulse width and maintaining a smooth idle may be easier by avoiding 76% larger injectors and providing a constant injector pressure differential.


    (AIR) Regarding Max whp on 25-27psig, I think I am are running about 300whp at 9psig (23.7psia) at current unknown temp.

    Example:

    At constant manifold temp, changes to absolute manifold pressure is proportional to changes in air mass.

    Assuming I can maintain similar manifold temp, through extra cooling, at 9psig (23.7psia) to 26psig (40.7psia).

    26psig of boost will be about 515whp, potentional air mass.


    Do these values seem logical?


    Kyle D Great information and I appreciate your feedback, on this journey :)

  • Fuel Pressure

    Was having difficulty finding a thread regarding Fuel Pressure. Point me in that direction and I will add to it. :)


    What is stock Fuel Pressure? (about 58psi?)


    rabtech  Dave@DDMWorks  Kyle D and All,

    - I'm trying to avoid E85, for a couple reasons... At what HP running 93 octane will I need to upgrade the fuel pump?

    rabtech I know you mentioned 450whp no problem (511whp peak bursts), but then I notice a thread where you replaced the fuel pump and I think you are running 93 octane?


    - At what HP/BoostPressure running 93 octane should go with a manifold pressure referenced fuel pressure regulator?


    - What is recommended constant fuel pressure at 500whp?


    - What is recommended injector size for suggested fuel pressure at 500whp?


    Note: I'm aiming for 500whp (on my current DDM Stage 3 Turbo) with future DF Project 324 8.6" LSD to lay it down.



    Kyle D, Thank you for the previous data which I will continue to refer to. :)

  • Brake Failure Light!!! Are you doing it wrong???

    I'm running a 2015 Slingshot. Bought it 13 months ago, and the problem was there when I bought it. Polaris distributor (not my seller) replaced the sensor(s) no charge. Perhaps for safety and liability reasons.


    Yep, no cruise control until it was fixed. :(


    I'm hoping to bypass nearly everything when I get the Haltech 1500. The stock ecu is a mystery box to me. LOL


    Let me know if yall have questions about what happen when you disconnect wires from particular components. I removed about 35% of my wiring harness.