For me the biggest reason to go FI is they'll keep running on a
30+degree angle ;o) Second is cold starts, hell any start. I can
stand in my living room and start the PT Crusier. All 3 of my
carbureted vehicles require.... uh.. finesse to start for the first
time that day.
But ya most of the 4x4's I know of that changed over to FI got better
mileage as a side effect.
On Oct 6, 2011, at 7:45 PM, Kurt Nolte wrote:
I will say that, with a stock engine, the two EFI conversions I
have been a part of have provided approximately 25% bumps in
mileage over the carbureted version.
One was a pickup, 80s vintage. 2.2L inline engine. Ran
fantastically, owner just got bored and wanted to put EFI on it (he
also loathed the warm-up period on the carb). We made it a "hidden"
swap, using a Weber-look carburetor replacement TBI unit. Swapped
to Distributorless ignition with a pickup wheel hidden in the
pulleys and individual coils that I forget where we hid them.
He went from getting ~24mpg combined on the carbs to averaging
30mpg, mixed city/highway. It was a Ranger-sized truck and he
wasn't gentle with it (thus the 24mpg. I got 28 in mine. :D).
The other was a hopped up Beetle, 2035 engine, dual carbs, all
that... decided that he was eventually going turbo, EFI came first.
Bumped mileage up into the thirties from the upper twenties.
The big benefits I see to an EFI conversion, as they relate to fuel economy:
*"Intelligent" warm up: you don't have to bump the idle or dump in
an arbitrary amount of extra fuel to start a cold engine, and warm
up is faster.
*Closed Loop Operation: lean when you need to be lean, rich when
you're on the power; carburetors require that you tune to a
"compromise" setting.
*Automatically compensates for all kinds of wonderful environmental
situations.
*YOU DON'T HAVE TO TOUCH IT. Seriously. I hate working with
carburetors. Not because they're difficult, but because they're
such babies and need you to check up on them.
*Throttle response: most FI, because of fuel and spark mapping, is
going to be better on throttle response than an equivalent
carbureted engine, meaning that you need to reef on it less to get
the same Whee!.
Anyone disagree?
Pat Patterson
Abbotsford, BC, Canada
2001 PT Cruiser
83 450 Honda Nighthawk
78 F350 460/C6 on propane
71 Bronco 302/C4/D20 D44/9"
Some people try to turn back their odometers. Not me, I want people
to know "why" I look this way. I've traveled a long way and some of
the roads weren't paved.
"If you can't take the heat, don't tickle the dragon."
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