[Diy_efi] coolant temperature mod

[Tom Cheung]

anyone have info for import ecu's
suzuki swift gti

will this mod advance or retard??


Tom 

----- Original Message ----- 
From: "Bobby Riggs" <bobbyriggs at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Saturday, June 15, 2002 2:10 PM
Subject: Re: [Diy_efi] coolant temperature mod


> In general this works fine!  I would only do it
> to a manual trans car so you don't have to worry
> about TCC.  In theroy the colder the motor, the
> more retarded you need the timing to keep it
> going..  When an engine is 'up to speed' you can
> kick in the advance to keep it 'free wheeling'.
> In other words its that little push you feel even
> though the throttle is in the same posistion, its
> an emission thing started in the '70s(when
> vaccume advance became popular).
> 
> So Colder = Richer = more retarded
> 
> Hot = leaner until the "peak" where the computer
> determines the engine is 'too hot' then its
> starts to do a little preventative meassure by
> retarding the spark and richening it up a little
> to get the temps down in the heads mostly.
>   At least thats my understanding.  Of course a
> Jap. ecu is going to be different than a GM but
> the same principal applies. just my 2 Cents 
> -Bobby
> 
> --- Bruce <nacelp at bright.net> wrote:
> > 
> > 
> > Without knowing all the coolant temp variables,
> > your flitting with fire.
> > EGR enable, TCC, CCP, are all likely to be
> > dependent on it.   In general,
> > not a good way to do things.
> > Bruce
> > 
> > ----- Original Message -----
> > From: "Tom Cheung"
> > <tcheung at associated-labels.com>
> > Subject: [Diy_efi] coolant temperature mod
> > > does anyone know anything about putting a
> > variable resistor between the
> > > coolant temperature sensor and the ecu?
> > > i have seen mods on the net on some toyota
> > cars where they do this to make
> > > the fuel mixture more rich and at the same
> > increase the air flow sensor
> > from
> > > the MAF typically does this make the ecu
> > adjust ignition timing since it
> > thinks the
> > > engine is colder than it really is? will it
> > advance or retard your timing?
> > 
> > 
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