[DML] Re: PRV Performance - Set me straight please

["endotex23" <endotex23@xxxxxxxxx>]

--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:

>While you're absolutely correct in what you say, have a look at
www.journeytoforever.org and chase down the statistics on pollution
produced in the production of these modern, "cleaner" cars and compare
it to the emissions kicked out by a 20 year old car in 20 years<

Sorry Mate, I was unable to find the data you're refering to. If
you're implying 20 year old petrol powered cars produce less
emissions than modern ones all I can say is to send me some of
whatever emissions you've been smoking.
 
> Over here in Europe, we're now sitting on cars such as the Renault
Clio 182 and the Honda Civic type R (is this in the US yet?) both of
which are small, relatively economical runarounds that through some
really clever VVT are pushing the 100bhp/litre goal, normally
aspirated. North America is really behind the times<

Hey, you'll get no argument from me about that. It's what I meant when
I said technology is a substitute for displacement. As for emissions
I'm not familar with your standards so I'll have to plead ignorance.
However, 4.5% CO is serious pollution by ours and neither physics nor
the atmosphere changes across borders you know. It's OK, you can be
forgiven because your climate is wet enough to wash all that stuff out
of the air ;)

> According to my friend and PRV expert, anything over 2% is not a
healthy mix and you'll start experiencing bore-wash.<

Well, your friend is right...sort of. I left out bore wash (another
quaint Brit term) because I was under the impression you wanted
maximum bang for your buck (err pound). And I did say in another post
more power makes more wear. I'd argue 4% will cause wash but since
he's a PRV specialist I'll give him this. 2% is not best power however
and I thought that's what you were going for. All things considered
you're setting is a good one for street use. Just remember when
dealing with experts you need to trust, but verify...and don't believe
everything you read on .org sites ;)

> Remembering of course that the mixture adjustment screw is only the
"+C" in your fuelling graph and what really counts is shimming up the
primary pressure regulator and tuning it up using a wideband lambda
probe. You can also use this method, to a certain extent, to tune up a
turbo'd D.<

All true but a wideband O2S is still inferior to gas analysis or even
EGT, especially at WOT. There is more to emissions than exhaust stream
O2 content you know, it works pretty well for tuning but not so well
for diagnosis. But yes, you're right. I use one (a Innovate LM-1) and
it's a fine tool when used properly.

>After all, the K-Jet system is a crude air-mass meter, just a
restrictive one. Shim it up to account for that restriction and all
you have to worry about is the ignition<

Also true and for what you're doing shimming is good enough but it's
still, as you said, crude. Hey, I already said you were a sharp guy so
don't get cocky. Besides, last I checked you were still a little rough
on a few things. And what's your beef with ING? You shouldn't have any
problems with that, it's a cakewalk compared to fuel metering.

G








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