Injen intake installed DC5 delaying VTEC?

[tinkerbell]

changing the airflow path changes the characteristics of an engine (which is essentially an air pump).

to optimise the power output of the engine - you need to re-tune the ECU to match the new airflow path.

simply going by your butt dyno is dubious - as you cant compare what you are feeling now compared to what you were feeling before...

you might have MORE power overall, but a dip in torque at a particular point (torque = feeling of power)

teh other thing about butt dyno's is that they are heavily influenced by your auditory senses, so any differeences in sound will have a more than proportionate effect on your other perceptions - that is, you are more likely to feel a difference if you hear a difference, even if there is no difference...

conclusion - VTEC is not delayed, you are more likely experiencing a dip in torque at a a higher RPM... due to the shorter intake path...

like flippit has said (he also mentined the psychology of it too)

[Flippit]

Here is a great example of what your experiencing.




Follow the green line for my explanation:
As you can see the torque line (lowest green) is a gradual line then as VTEC engages the torque drops and then at about 6300rpm it rapidly increases and hits its peak torque at just before 7000rpm.

Your experiencing the same thing if not very similar. The green line is a stock DC5R with just a Short Ram Intake.

Now if you look at this image, its basically the exact same as the GREEN one above but it now shows the Air/fuel ratio


If you look at the VTEC engagement area 6000-6500 you see a SLIGHT power drop but will also notice the Air/Fuel ratio change. That dip in the ratio is the car going 'richer' (throwing in more fuel) so once you get a tune the tuner will note this and may reduce the amount of fuel thrown in (making it more 'lean') thus creating a more smoother/flat line.
Every motor is different, some require more fuel to keep the power going, some require to lean out to create the power. Every car and setup is different which is up to the tuner to note it all and make changes accordingly to make power but at the same time keeping the motor safe from pinging (too lean).