ECU's & Things

[quk@isham-research.demon.co.uk (Phil Payne)]

In message <0db2f1015020cc7UPIMSSMTPUSR04@email.msn.com> "Mike Rosoft" writes:

>     I have a 200T with a KC 2.2 Europe engine + MAC05 ECU. From what I can
> see, there is NO ECU control for the wastegate, so what I was wondering is
> if I put a shim or bigger spring in, can I bypass the fuel pump cut-off from
> the ECU by grounding pin 22 (the fuel pump relay control). Is the fuel pump
> and cold start valve designed to have continuous power or is there a
> pressure sensor or some thing that turns the fuel pump off?

Once the engine's running, the fuel pump runs all the time.

You _can_ hotwire the pump so that the ECU doesn't shut it down in an overboost 
situation.  How long the engine will last is a semi-random variable - one I 
know of just blew at 18000 miles after modification, one didn't reach the end 
of the road.  I think 18000 miles is the record so far.  Burnt holes in #4 and 
#5 pistons - a common failure mode.

There are other considerations.  The ECU doesn't power the pump with the 
ignition on, unless the engine is turning.  Your modification would run the 
pump with the ignition on and the engine _not_ turning - there may be safety 
implications.

-- 
 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club