[Diy_efi] Continuous VVT system

[Alexei Pavlov]

espresso_doppio at yahoo.com wrote:
> 
> --- Alexei Pavlov <alexis.pavlov at st.com> wrote:
> 
> >>> It's EFI but without cam sensor as it's 2s per
> >>> cylinder.
> 
> >> Ah, waste spark and bank fire injection.
> 
> > No sir, bank fire but twin spark twin distributor
> > ignition :-)
> 
> Aha.  Yes, I suppose that fits with the period.  I'm
> os un-used to seeing vehicles with EFI and
> distributors these days...

The car is of 1988, it was first designed in ~1985

> 
> Which, of course, makes me think about scrapping the
> stock EFI and distributors and replacing them with a
> single box.  ;)

Stock EFI is good, Bosch Motronic. I can reprogram it.


> >> The magnets?  Yes, they are attached directly to
> >> the camshaft.
> 
> > Ok, a good news. I'll think about that.
> 
> Most cam sensors I have seen are Hall-effect with a
> small magent trigger attached to the nose of the
> crank; the Hall effect sensors are less sensitive to
> the size of the gap between magnet and sensor, which
> can be important with the temperature difference
> between cold and hot in a cylinder head!

I'm likeky going with Hall sensors. I found a way to mount
magnets on the camshaft, with a kind of epoxy ring.


> Hm.  I haven't seen Toyota's system...  What markets
> is it in?  I'd love to have a look at it.

On recent Lexus. Named VVT-i or VVT-L I believe.

Alexei
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