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Won't work.. (archive)

[ Follow Ups ] [ E30 M3 Message Board ] [ Msg. Board FAQ ]

Posted by Stan on January 28, 2002 at 08:15:45:

In Reply to: Re: Could Vanos be applied to s14? posted by Gordon Monsen on January 27, 2002 at 19:13:25:

>>>Anyway, the AFM thing is down, because I'm going to a Motec ems and will use MAP for load. I think its a better measure and a lot faster than any air flow sensor (MAF). <<<

You need to use a TPS in conjunction with the MAP sensor or it won't have enough resolution to accurately control fueling above about 4000 RPMS. Or run straight TPS.

Vtec and vanos are not equivalents. VTEC has a third cam lobe between the two lobes for a given pair of intake or exhaust valves. Thinkof it like an on-the-fly cam swap. Either cam A or cam B. On an S2000, the big cams are something near 300 degrees - which wouldn't work well in street driving. So the other set of lobes is a ordinary streetable set. Only one or the other can be used - it's not continuosuly variable.

Vanos uses the same cam lobes but alters the phasing between the cam and the crankshaft at the cam gear. Honda now does this for the intake cam on some VTEC motors - they call it iVtec.

The aformentioned are not bolt on mods and very few shops could make something like this for you. And in racing, the vanos and/or VTEC is often turned off. For example the Honda Accord touring cars had VTEC eliminated.

The gains from variable cam phasing are nice but not huge. They are dwarfed by things like ditching the AFM which very usefully adds output and broadens the powerband.

A more doable mod for the S14 would be too creat a dual resonance and/or variable length intake manifold. Check out the E34 M5 dyno charts. It added around 15% more low /mid torque and a hair more power in the final part of the power band. Not that hard to design or build and the electronics to control it are not very complex and can be freestanding.

Stan


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