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Thread: PID turbo tuning tips?

  1. #1

    Default PID turbo tuning tips?

    Hello all, I was hoping to get some pointers on my tune and datalog. Car is running well overall, still working on getting the launch right, but I've ran a 9.39 @ 146 on 16 psi on this setup. S475 turbo with billet wheel, A2W intercooler, 5.3L truck engine with cam and PG with PTC converter, 3.55 rear gear. I uploaded the tune and datalog below. Datalog for some reason started a few seconds into the run, but you can still see the oscillation of the dome pressure & solenoids. I don't know if that's normal or not, and I haven't been able to find much info on this. I'm not running CO2, based just off compressor pressure. Thanks for any help that anyone can provide.

  2. #2
    Join Date
    Dec 2009


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  3. #3


    Thanks Danny. One question I have, when I'm PID tuning with shop air, should I select Solenoid Source Pressure as Compressor or Fixed? I don't have a Fixed pressure source normally, since I'm running off a Compressor pressure, but does it need to be set that way to accurately tune PID?

  4. #4


    80malibuturbo, when testing the PIDs with shop air, you'd select Fixed and set the pressure to whatever the pressure is you set the test regulator to. While this will get you close, having a fixed air source on the car (CO2 or onboard air) is far superior for boost control. Using the compressor as your source, there's a lag for the compressor to build pressure and the wastegate has to essentially wait for that signal. Not so with a Fixed system. I've had both and now run a VIAIR onboard system and would never go back to the Compressor as a Solenoid Source Pressure, unless rules deemed so.
    1932 Ford 3 Window, Injected SBC
    1970 Nova 5.3L, S475 Turbo, 275 Drag Radial

  5. #5


    Yes, after some more research, I setup a CO2 tank with regulator and just going that route. All signs point to that being the ideal control setup for a car like mine. Thanks.

  6. #6


    You won’t regret it.

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