Opel/Vauxhall's unconnected socket in the engine bay

[martin at mgass.demon.co.uk]

Thanks for the reply Alexander..

>Yes, it is. I own a Vectra B 2.0l 16V (model 1997) and a Tigra 1.6 16V (model 
>1996). Both have these connectors. I'll have a look at my cars and tell you 
>exactly the position after christmas.

Interesting, I wonder where would one go to get a suitable plug to put in
this socket ? ....What would the pin-outs be ?  ..Is it an all-range effect
or low.. mid.. top-end only ?  Someone must know !

>They are too rich at full throttle and a lean mixture gains some horsepower from 
>the engine. Our technicians have already tried by changing the maps.

Out of interest how do you go about changing the maps ?  I presume 
you use a laptop PC connected via the ALDL with suitable software.
Do you have any problem with prom checksums ?
Roughly how much bhp gain could you get at top-end?

Also what are your views on the current 2.0 16V tuning wise, I believe that
they are a lot down (power-wise) on the earlier (approx. 1990) incarnation 
in the Astra GSI/GTE.  I understand that the cams are set roughly 
the same but that valve sizes have been reduced and angles altered.
I also understand that the current engine was a disappointment for 
Touring car racing and that the earlier engine has been 
re-homologated by running off a small batch of Vectras equiped with it.. 

>We can't remove the cat in Germany. Therefor we change the response time of the 
>lambda sensor in the eprom. After accelerating hard with a lean mixture it gets 
>rich again in order to cool the cat.

I am not sure I understand this... are we saying that at full 
throttle the mixture is normally rich to preserve the cat ? and that 
the tune is to allow a period of leaner running followed then by a 
rich period to keep the cat happy ?
I also observe that if one were to remove the cat then it would not 
be necessary to have a rich period, because there is nothing 
downstream to get damaged, also I presume you could go to the optimum 
lean setting ? 

>What is Diacom s/w???

Its US based diagnostic PC s/w for GM etc. (see rinda technologies, easy 
to find on the net).

regards,

Martin


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martin at mgass.demon.co.uk
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