Ferrari Mailing List: Re: Carb 308 smog test

[Misc (misc]

As a point of information, I have a 78 CJ5 with aftermarket headers/intake,
4bbl carb and even it passed smog.....

Bob - I left CA 5 years ago, but thought your car was old enough to get a
historic vehicl plate and not need smog?

Mark Lueker
308 SYSTEMS Inc.
970-282-7006
www.308systems.com

-----Original Message-----
From: robert_h_bowser [at] juno.com [mailto:robert_h_bowser [at] juno.com]
Sent: Tuesday, May 12, 2009 3:37 PM
To: Mark
Cc: The FerrariList
Subject: [Ferrari] Carb 308 smog test


Got my annual Kalifornia smog test notice for the old '78 308GTS, and duly
took it down to the local Test Only station.  It passed, although just
barely.

It is funny, there is a perception that these old carb cars are impossible
to keep in tune and very difficult to smog successfully.  I never touch the
carbs, and the car has NEVER failed smog in the (almost) 12 years that I
have owned it.  Six biennial smog tests.  Six passes.  All I really do is
drive it regularly.  Perhaps that has something to do with it.

In contrast, my brother has a '78 Porsche 911SC.  Same year, different
manufacturer.  Although it is a product of German engineering, and fuel
injected, it fails smog regularly.  He has to take it to his mechanic to get
the mixture adjusted so it runs like s**t, get it smogged, then return it to
put the mixture back to a drivable setting.

I think perhaps the reason my car barely passed this time is because I went
back to the standard 55 idle jets.  I had been using 60s.  With the 60s, it
seemed to run a bit better right off idle, but worse at higher throttle
settings, especially when hot.  The smog test has the car running at 15mph
and 25mph on a dyno, which is right in the flat spot of the 55 jets.  I
think next time I'll put the 60s back in for the test.

Bob
'78 308GTS
'01 Corvette Z06

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