turbo and WOT injector

[Peter Berrevoets]

At what RPM does the engine start to lean out at full throttle? - what if
one takes the after TB location of the temp sensor blank on the MC manifold
and mount an injector there - trigger cold start valve at WOT and xxxx rpm -
trigger additional injector at WOT and xxxx + ? rpm til redline... ?

Not an engineer, just power hungry.

Peter B
1990 200TQ

-----Original Message-----
From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
Behalf Of Jörgen Karlsson
Sent: Thursday, August 24, 2000 5:54 PM
To: Swann, Benjamin R. (BSWANN); quattro at audifans.com
Cc: tquattroguy at yahoo.com
Subject: RE: turbo and WOT injector


> The question is:  How do you add the sixth injector?  Could I take a spare
> line and coldstart injector and locate it somewhere in the manifold - is
> there a place already tapped that could be used.  Would I screw the
> receiving end into one of the ports in the fuel distributor that is
> currently plugged with an allen screw?
>

Rule #1 of adding additional fuel are to add it before the throttlebody or
at each port. This leaves us with the before TB if we want to keep it
simple.

Rule #2 says that the fuel must be added after the intercooler.

This don't leave us with many options, does it?

I have a prototype circuit for pulsing an EFI injector a set period of time,
for every ignition event. In other words it follows the engines demand on
fuel over rpm.  The parts excluding box will cost you less then $10 even if
you include all the functions that I mention in the text...

An oil pressure switch in the intake manifold is one of the best
alternatives for trigging the circuit, a 5kCS has a .3bar switch that is
suitable if you also use a full throttle activation switch.

This way the car will get to much fuel if you have full throttle and more
then 0.3bar of boost at low rpm (1.3bar at the dial). There are simple
circuits for dealing with this problem too, a '555' or a '74LS123' can do
this kind of filtering, even included on most data shets for these
components. The 'LS123 alternative would be logical as I use this in the
controller have one to spare as there are two blocks in each IC.


Jörgen Karlsson
Gothenburg, Sweden

For sale:
New K24-7000 turbo(S4), MC exhaust manifold, wastegate, downpipe.
Used K26 turbo, MC exhaust manifold, wastegate, downpipe.


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