I’m continuing to work on replicating the boost profile that the car operated at with the BorgWarner K04’s. In this effort I am mainly concerned with the top end boost so that I can compare the pre-turbine backpressure produced by the Turbo Concepts Stage 1 turbochargers with that from the other logged turbo’s. The current state of the boost profile is shown below:
This tune started from a FrankenTurbo F21 tune that I used with the same hardware, aside from the turbochargers. The wastegates on the Turbo Concepts turbochargers are set about 1.5 psi less than what the FT’s had, so I was anticipating some adjustments needing to be made. The first few revisions were not generating the results I was wanting, so I went back and logged the boost developed at a variety of fixed wastegate duty cycles. A sample of some of these are shown below:
I suspect one of the reasons this effort to modify the tune is proving a bit more of a challenge than I had anticipated is on account of the unsteady boost curve. I’d have expected a fixed WGDC to produce a straighter line. I was concerned with the wastegates when I was trying to set the pre-load and was having trouble, the variations shown above further my concern about the wastegates on these turbochargers.