do u realise a distinct crossover in sound when hitting the vtec mark
5500rpm?
take a few snaps of the engine bay to show us.
at worst, maybe its the engine if vtec does exist in that car
Why would you expect to hear vtec?
Its only the engine changing cam lobes, and there is not necessarily any different noise. I certainly don't hear anything much different until I get above 6000 rpm, and the vtec change was back at 4400 rpm.
If you really want to make sure, put a small indicator light across the vtec solenoid to show when the solenoid kicks in. You need a direct monitor on the working parts, and not your ears or butt-dyno.
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