Odd boost and hp readings
02-19-2020, 12:31 PM
#1
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Odd boost and hp readings
My car is a 2001 with a MK kit. Manual boost control. I took a data log to run through Virtual Dyno and got a weird graph. It shows a huge spike in boost, which doesn't show in Meta Log. The 240hp has me worried that I may be ventilating the block as well. Is this a glitch in VD or is my tune more fubared than I thought? Attached is a copy of tune and log. Thanks for any advise.
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02-19-2020, 12:44 PM
#2
You bounced the limiter and confused VD. That solid red line is AFR, not boost. Coincides with a cut in pulsewidth (limiter) a few milliseconds earlier, you can also see RPMdot go crazy.
Look around for how to scale KPA to PSI to have it displayed right in VD, it's there (dashed red) just at a wrong scale.
VD measures power by calculating change in rpm over time and the RPM goes noisy when you hit a fuel cut. Everything before 6500 or so should be more accurate.
Look around for how to scale KPA to PSI to have it displayed right in VD, it's there (dashed red) just at a wrong scale.
VD measures power by calculating change in rpm over time and the RPM goes noisy when you hit a fuel cut. Everything before 6500 or so should be more accurate.
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