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Could it possibly have anything to do with my car having an obd1 distrubitor?

It's the pr3 ecu and I'm not sure if the rev limit is exactly at 8200 its just around there, and I have heard many places that that is where the stock limit should be. But one of my old cars had a pr3 ecu in it that i could run the needle all the way down to the end of the tach which I would...

I don't think that it is chipped, because I don't see any benefit to raising the vtec change over and the rev limiter is only at 8200. It has always changed over late even right after oil changes and I check the oil often, so I don't think that oil level is the cause.

I have a 90 si hatchback with a b16a1 in it. The car runs strong, but vtec doesn't come on until about 6500 rpm. Is this a computer issue, or does any one have any suggestions for me to try?