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dmg210

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Posts posted by dmg210

  1. G4+ Thunder OBD-II

    in G4+

    Posted

    Hi guys,

    I've been doing a lot of track days recently and thought it would be great to capture some of the action on video. 

    I have a Garmin Virb camera which supports datalogging via an OBD stream and I'd love to get it hooked up to the Link ECU.

    At the moment, I have the Android headunit connected via OBD which i use for temperature / pressure monitoring on track. I even have a couple of alarms setup in Torque Pro which act as an early warning for the some of the failsafe features i have configured in the Link.

    Would it be possible to configure the ECU to output the OBD Stream on both CAN 1 and CAN 2? 

    Cheers

    @Scott@Adamw

    Screen Shot 10-09-23 at 03.29 PM.PNG

    IMG_20230416_163747.jpg

  2. PWM Fuel Pump Control with Siemens/VDO Unit

    in G4x

    Posted

    Problem 1:

    When testing under boost the fuel pressure seems to drop off... I thought at first maybe the fuel pump wasn't large enough so i switched from the Walbro 255lph to the Deatsch 320lph but it hasn't made a difference. I was expecting the larger pump to increase base pressure even further but that wasn't the case, it's still around 65psi with the pump at 100% duty cycle. 

    To be honest I haven't seen this done before and i'm unsure if this is going to work... I'm just posting for ideas or advice :) 

    fp under boost.png

    Problem 2: 

    I think I possibly have a leak on the fuel pressure regular hose as it sounds like I've installed a jet wash in the fuel tank. I wish i could see inside the tank whilst it's running... It could just be fuel shooting out the tiny hole in the return line that i can hear. I'm just worried it's leaking from the FPR hose clamp and spraying fuel into the electrical connections. To be honest i'm a bit stuck and I can't seem to find an example online of anyone else that has done this.

    Questions: 

    - What are the downsides of running 43psi base FP with 30psi boost? Can this be done safely? I'm not seeing any drop in fuel pressure.

    - Could the stock FPR be completely removed? 

    - From a safely aspect is there anything i've overlooked?

  3. PWM Fuel Pump Control with Siemens/VDO Unit

    in G4x

    Posted

    Hi guys,

    I've come up with this wild idea of creating a rising rate fuel system using the Siemens PWM Fuel Pump Controller. 

    The part number: 7W83-9D372-AA  (Jaguar XJR V8 - 2018 model)

    controller.jpg

    At the moment the car has a returnless fuel system with an in-tank FPR fixed at 43.5psi. The car was originally NA although i did a turbo conversion about 10 years ago.

    To take things to the next level, what I'm planning to do is install a larger fuel pump to overwhelm the stock FPR and then PWM control the pump. This way I can maintain stock fuel pressure during idle / cruise, quieten down the pump and reduce heat etc. During boost I can increase pressure (1:1) by speeding up the pump (in theory anyway). 

    My old pump was around 160 Lph, the new pump I’m testing with is a 340 Lph from Deatschwerks.

    The new pump has the PRV set at 100psi. With a raising rate FPR this should allow for around 50psi of boost (way more than what my little TD05-20g can handle)... One good thing about these aftermarket pumps they are rated for between 6v and 18v which seems a perfect match for the fuel pump controller I'm testing. I need to do a little more research and check if the 340lph is within spec in terms of max current draw etc. I also need to review the wiring specs (especially on the PWM side).

    From initial testing:

    Voltage at pump (engine running - FP Speed - Open Loop)
    voltage    fuel pressure         duty cycle
    4.8v          45psi                    40% (unhappy)
    6.1v           47psi                    50% (sounds good, very quiet)
    7.4v          48psi                     60%
    8.6v          50psi                     70%
    9.7v          52psi                     80%
    10.7v        68psi                     90%
    11.6v        65psi                     100% (loud AF)

    Note: The duty cycle is backwards in the screenshot. 70% = low speed (6v at pump), 50% = full blast (12v at pump).

    fp pressure at idle.png

    The stock FPR which sits inside the fuel pump housing. It seems to have a tiny little hole in the return line.

    stock fpr.jpg

    Testing base fuel pressure with the PWM output rigged up to the AP:

  7. G4+ Thunder OBD-II

    in G4+

    Posted

    Would it be possible to add additional parameters with a firmware update? It would be great to be able to create a set of custom PIDs. Do you know if the EGT parameter will ever be added to the obd stream? 

  10. G4+ Thunder OBD-II

    in G4+

    Posted

    Oh ok great. At the moment I have PLX EGT gauges which I'm using with a imfd to USB cable which is connected to my Android unit. 

    I would like to wire the egt probes directly to the thunder ecu thermocouple inputs so I can datalog then use the obd output for the display. This would make for a much cleaner install. 

  11. G4+ Thunder OBD-II

    in G4+

    Posted

    Hi, 

    Please can you advise on the OBD-II PIDs available on the thunder ecu? 

    I would like to use my Android headunit to display AFR, EGT, ECT, IAT and STFT if possible? 

    It would be great if you could programme your own PIDs :-) 

    Cheers, 

    Dan

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