Hello i placed the 2003 RSX fram replacement oil filter #7317 on my h22 in place of the large duffy filter offered from the catalog . I see the increase oil pressure logic from having a smaller filter. It mated fine to the sandwich and threaded fine.

Is this the right thing to do?

I do notice that my chipped gsr p72 starts sending signal at 4500 but the car engages vtec at around 4700. Thanks in advance

 

What was your oil pressure before and after changing the filter?

 

Not sure. I simply noticed that vtec 12v wire starts swnding at 4500 and i feel it engage at aroubd 4700. I dont have a meter on it. Im gonna introduce a oil psi gauge. The old head at my job goes "myth"! A B16 fanatic also hinted at the use of the smaller filter and for the past day i haven't had the guts to push the car to engage vtec.

 

Does your H22 have IAB? Is the "event" at 4700rpm the IAB's opening up? That's not supposed to be at the same rpm as the vtec cam.

 

Its a jdm h22a with november 91 p13 on the head/block it is equipped with the oem intake manifokd/iabs vacuum operated right? Is that the "blop" sound i mistake for a backfire the opening and closing sound when i play with the throttle from the engine bay? Im pretty sure the iabs works properly. When does s factory gsr computer engage vtec?

 

Update my vtec solenoid switch was disconnected so vtec never engaged with the smaller filter. I now have normal sized mobile 1 filter on the car.

 

Something tells me that

A) engines that take the smaller filter pump at a higher threshold and the internal bypass spring is set for those engibes.
An older Honda engine might be fighting with that pressure valve inside the filter.
B) results inconclusive : i was unable to see how vtec engaged with the smaller filter

 

My theory is that the signature switchover point sound when vtec engages would be less noticeable because overall baseline oil pressure is higher from the get go and the distance from required psi for vtec ehagement is shorter. Anyone ponder these things?

 

I don't remember what rpm each one engages. But from having a GSR for 10 years it's the IABs that make an audible change. The cam switchover happens at a lower rpm and that isn't a noticeable sound.

The IABs are actuated by vacuum & the VTEC cam is actuated by oil pressure. But they aren't passive - they are both commanded from the ECU. Higher or lower oil pressure doesn't change the rpm at which the cam switches. Higher or lower vacuum doesn't change the RPM for IAB switch either.