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Variable Cam Control Tuning: WOT Optimisation

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WOT Optimisation

02.30

00:00 - The last step of the cam tuning process is to optimise the performance at wide open throttle while performing ramp runs on the dyno.
00:07 As you can expect by now, there are a few differences in the way this step will be applied depending on the specific style of engine you're tuning.
00:15 Let's start by dealing with the simplest which would be a switched cam control system.
00:20 Here we'll just be following the process already demonstrated in the practical skills section of the course.
00:26 This simply requires us to perform a ramp run on the dyno with the cam switching set very high in the RPM range followed by a run with the switchover set low in the RPM range.
00:36 We can then clearly see the point or points where our graphs cross and select them to suit.
00:43 Remember that some fine tuning of the exact switching RPM may still be required once we have it in the ballpark.
00:49 If you're dealing with a fixed cam engine fitted with vernier cam gears then this is really the key step for your tuning process since we're normally only focusing on wide open throttle operation which is why we've bypassed a number of the previous steps and come straight here.
01:05 You're simply going to follow the process covered in the practical skills section of the course while performing ramp runs and optimising the power and torque curves to suit your own preference.
01:16 Just remember to ensure that you're reset the base ignition timing on engines that run a distributor or cam angle sensor that's driven off the cam that you're adjusting, so that your results aren't adversely affected by unexpected variations in ignition timing.
01:31 It's critical to also ensure that your cam pulleys are correctly locked up once your adjustments are finished to prevent unwanted movement.
01:38 For continuously variable cam control engines we'll again be following the processes demonstrated in the practical skills section of the course.
01:46 Remember that tuning the cam timing is an iterative process and each change in cam timing will likely require changes to the fuelling and the ignition timing.
01:55 Overlooking these requirements can often mask the true effect of your cam timing change on the engine.
02:02 On turbocharged engines we also want to be careful to check that our cam timing changes haven't affected the boost level as even a small change to the boost level will impact the power and torque curves which can make accurate comparisons to a previous run difficult.