Re: 4KTQ conversion questions

[Huw Powell <audi@mediaone.net>]

> > >the 87 4kq has CIS-E, while the 5kt uses a CIS system (actually more like
> > >CIS-III, but Huw Powell can explain that better than I can).  Not sure if
> >
> > Well, I suppose the next question would be:
> > What does one lose by going with a different Fuel Injection System?
> 
> Generally the newer the generation of fuel injection system, the more
> precise the system can control the various engine operating parameters,
> pushing the envelope of power/emissions/economy/driveability, etc.
> 
> That said, each Audi's fuel injection system is designed specifically
> for that model's engine.  Swapping to a different system will probably
> hurt performance without changing many of the operating parameters and
> programming to match.  This is especially true with the later systems.

what's really weird, of course, in this case is that the 5kt's are using
stuff that was eliminated in the 1983/4 move to CIS-E, i.e. frequency
valve to control amount of fuel, warm up regulator for cold enrichment. 
But it has an ISV and knock sensing ignition...

What it is, is unique.

Dan Jones told me privately, and I may be misquoting him completely,
that the CIS-E fuel dist can only keep up til about 5 lbs of boost - so
maybe the "old style" CIS fuel dist in the late 80's 5kt system is
capable of delivering more fuel?

If there isn't a reason as compelling as that, you could probably run
any one of these engines with any management system you want, the price
you would pay would be in terms of sophistication - how much power you
could wring out of it without breaking it, how well it would start and
run ("driveability"), and how economically it would do it.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

82 Audi Coupe; 84 4kq; 85 Coupe GT; 73 F250