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RE: [T3] Type three and Type 4 ECU's


Isn't it possible to just put a pot. Between the ECU and the sensor on the
original ECU? Also you could put a resistor in that location once a value is
determined. I remember reading somewhere that someone used a 278 ohm
resistor to get more fuel. I was looking for the document but have not been
able to find it. Seems to me it would be easier to modify what you have VS
changing everything over. Just a thought. I also have not tried this yet.

Mark-69 Fastback

-----Original Message-----
From: Jim Adney [mailto:jadney@vwtype3.org] 
Sent: Wednesday, August 24, 2005 10:40 PM
To: type3@vwtype3.org
Subject: Re: [T3] Type three and Type 4 ECU's

On 24 Aug 2005 at 19:52, Craig  Webb wrote:

> Is it possible to swap the type three ECU for a type four unit?  Is the 
> wiring and large connector the same?
> 
> Reason for asking is that I've got a mild dark side project on the go and 
> would like the bonus of the idle adjustment pot on the type four unit,
plus 
> I could do with a slightly richer mixture (I've cranked fuel pressure up
to 
> max and still need more).  I figure a 1.7Type four d-jet ECU and MPS may 
> help me out some.

I don't think it's reasonable to just put in "a type 4 ECU" and expect it to

solve anything by itself, or even with the ECU and pressure sensor both. If
you 
wanted to emulate a 1.7L type 4, then you might do well if you put in a
matched 
(from the same year) set of ECU, pressure sensor, injectors, and throttle
body. 
They were made to work together as a set. Just swapping in one part of the
set 
assumes that the whole adjustment was done in that one part, which is
clearly 
not the case.

Note that the D-Jet systems came in 3 different "generations", so you would 
want to make sure that all your parts were from the same generation. The 
throttle valve switch and the wiring harness are 2 things that you would
need 
to watch here. As long as you stay within a single generation, I believe the

wiring would be the same for type 3 and type 4 ECUs.

Are you sure that you need more fuel? If you've already cranked the fuel 
pressure up to the max, then I'd expect you to be way over-rich already.
What 
is your fuel pressure? Have you measured it while driving? If your filter is

clogged, then the pump won't be able to maintain the pressure under load,
and 
that would lean things out when you're not expecting it.

-- 
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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