Vtec + gmecm was Hi!

[Shannen Durphey]

"Eck, Joel" wrote:
> 
> for the 700-R4, I'm thinking that if I can lay my hands on the later
> ('87-up) out of a diesel pickup, 
Shift points/firmness plus mebbe stall speed not the same as a gasoline engine. 
Maybe feel ok to ya, maybe feel like mud.


> But, the same idea about converting to a GM ECM setup did occur to me
> (just this morning on my way to work, as a matter of fact), and the same
> VTEC question popped into my head. VTEC wouldn't be a requirement for
> me, it would just be something I would like to do. I thought it out this
> far: if the ECM has a function that is usable as an RPM-activated
> switch, that can actuate VTEC. 
How about using the gmecm used with the V(or)tec v6?  Dual runner length intake,
tuning valve opened/closed to extend rpm range...  Sound like anything familiar?

4.3 Vin W engine, IIRC.  93-ish chevy s-10 and astro.  Unknown what the mask id
is for that one.
Shannen

the fuel and spark curve adjustments that
> would be needed could then possibly be worked into the maps. if not, I
> could go the route that several others have gone: use an rpm-activated
> switch (MSD or equivalent) to actuate VTEC, then I would still have to
> work out the fuel and spark tables in the ECM, the only problem there is
> when I hit the appropriate RPM, but VTEC does not engage, the fuel and
> spark maps would be out of whack. I could work around that by wiring the
> VTEC solenoid so it comes up regardless of oil pressure or temperature,
> but I like that little safety feature.... But I guess if my oil pressure
> isn't high enough, I've got more problems than having fuel and spark
> curves out of whack; and if I'm stupid enough to run it up into VTEC
> territory while it's cold....well, I probably do need to figure that
> part out. Maybe a temp switch controlled rev limiter.. Hey, I could work
> in the DIS while I'm at it...
> 
> thanks, Joel.
> 
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