T.O.O. or NITRO: No use for VTEC with the S/C?

Posted by Eric Knops (knops@csus.edu) on June 12, 1998 at 17:04:15:

From previous posts, I gather that VTEC is DISABLED on B-series VTEC's, due to the high overlap present. Is there no use for Honda's VTEC technology, when a supercharger is involved? It just seems like a real shame that all that good work by Honda engineers has to be thrown out if you add a blower. Is there no advantage in having a second timing setup at high RPM with a blower at all? It seems like there'd be some set of cams and timing you could devise that would improve the performance of the blower... maybe not as much as a N/A motor, but at least there'd be something.

Also, do you have to disable the VTEC on the D16Z6 as well, or does just having intake VTEC not hurt? If so, why not disable just the exhaust VTEC on the B-series motors?

Re: T.O.O. or NITRO: No use for VTEC with the S/C?

Posted by T.O.O. on June 13, 1998 at 07:29:44:
In Reply to: T.O.O. or NITRO: No use for VTEC with the S/C? posted by body on June 12, 1998 at 17:04:15:

The problem with the VTEC is that the intake event is too long, and the exhaust isn't really the problem. As for optimizing cam shafts for the VTEC engines, some day we will, but we're going in so many directions now, there's no time.
The other thing that you must understand is that with the blower, you already have too much torque at low rpm, and it's almost impossible to stay off the rev limiter in the first three gears because the engine accelerates so quickly "under pressure". Once you ride in one or better yet drive one, I really don't think you'll be thinking about the VTEC for a while. Pressure is a wonderful thing.
.....................................T.O.O. .........................................