Non Distructive testing (letting the smoke out)

[Putter C]

This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.

------_=_NextPart_000_01BE3E30.46DA3680
Content-Type: text/plain

Hi

I am not a expert on this, but if the ECU uses a current controlled driver
then it would force a constant current through a injector. This current is
the independant of the resistance and inductance of the injector. So if this
is the case then you can put as many injectors in series as possible ?! That
is if the turn-on current can be achieved by the voltage accross each
injector.

So the question is, what kind of driver are the ECU using, is it quasi
current controlled, open loop or square voltage driven?

Cheers
Carlo

> -----Original Message-----
> From:	Roland Johansson [SMTP:scirocco at mail.bip.net]
> Sent:	Tuesday, January 12, 1999 12:02 PM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	SV: Non Distructive testing (letting the smoke out)
> 
> If you place a finger on the drive transistor/or several and
> start it with normal number of injektors, simulate full throttle
> for longest on times. The transistor/s should get wam but not
> burn your finger in about 10-15 minutes time, try with bigger
> number of injektors, if you burn your finger you will be closer
> to the limit, probobly over if out temp are high
> 
> This is not scientific but could give you a good estimation if
> it will work. If the drivers get what you think is to hot, try
> add a old computer fan and test again.
> 
> 
> Roland Johansson
> Scirocco 1,6l TIC -82
> 
> 
> 
> > Nother thing, what would be a "safe test" for how long
> overloading
> > a driver would take.  If I wanted to see if something was
> going to
> > work on injector drivers, how long in running them would it
> take to
> > see if they fail?.
> >   I have two items to test, running 16 injectors off of a 8
> cyl TPI ecm
> >   Running 4 P+H injectors where 2 are normally fittted.
> > I would figure if the ecm gets only warm to the touch that
> would be one
> > clue.
> > Cheers
> > Bruce

------_=_NextPart_000_01BE3E30.46DA3680
Content-Type: application/ms-tnef
Content-Transfer-Encoding: base64
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------_=_NextPart_000_01BE3E30.46DA3680--