The vtec cross point and the vtec window are related but not the same. Vtec tuning can only be done properly on the dyno so changing it to some arbitrary number likely won't help anything.So I got a tune done on my car a while back and it’s a decent tune. But I was checking out the settings on my flashpro and noticed the vtec window is 4000-5000 rpm I was wanting to change it to like 4700ish and am not sure if that simple change will effect the entire tune?
The vtec cross point and the vtec window are related but not the same. Vtec tuning can only be done properly on the dyno so changing it to some arbitrary number likely won't help anything.
You probably won't hurt anything but fuel and timing do change with vtec. I say leave it to the professionals.
Also, you didn't mention anything about what vehicle you have and what mods are done.
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The lower threshold doesn't mean vtec comes on at that rpm. It means it could engage at 4000rpm only if the car is under high load, IE full throttle.Thanks for the info, I updated my OP with car details. All I want to do is make it to where my vtec engages later because 4000 rpm is a bit soon for my driving style
