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RE: General tuning question - fuel economy
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Well, do you have any cam specs??? With my single pattern, 208 @0.050"
278adv and .555 lift with 112 deg lobe center on a l98 (350tpi) I get 30mpg.
300miles out of 10impgal Or for you us guys 27 mpg.@ 85 mpg, 2500rpm
Mike Rolica
Plant A,
Magnesium Products Division
Strathroy
(519)-245-4040 Ext. 265
-----Original Message-----
From: Marteney, Steven J. [SMTP:smarteney@xlvision.com]
Sent: Tuesday, June 13, 2000 3:09 PM
To: gmecm@diy-efi.org
Subject: General tuning question - fuel economy
Not having really any engine "tuning" experience I stumble
on some of the
basic concepts (such as when to add spark advance). My
rebuilt 350 TPI
F-body gets about 20% less highway gas mileage with its
bigger cam (GM ZZ3)
and stock computer. I figure more air in at X rpm requires
more fuel to
appease the O2 sensor, hence gas mileage goes down. How do
I compensate, or
can I? I noticed there are some Hiway mode parameters, such
as Hiway spark
add (?), in the 165 ECM that I could take advantage of. Or,
is the only way
to get better mileage mean changing the target AFR?
However, I also thought that this engine cruises at about
2200 rpm on the
highway at 75 mph. I'm wondering if the different cam (and
valve timing)
has defeated the ram tuning effect of the runners and made
the engine less
efficient on the highway. Any thoughts? I'd appreciate a
little basic
help. Since this car is my daily driver (70+ per day) I'd
like to keep fuel
economy in mind when tuning.
Thanks,
Steve Marteney
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