29622Re: [classicrv] Turbocharging
- Mar 1, 2008my issue isnt power....its mpgs!!
Ron Mitchell <rmitchel@...> wrote: I'm going to start a new subject thread on this issue. I believe
we've discussed this before. I'm a big fan of turbocharging.
At 10:30 PM 02/29/2008, you wrote:
>adding a turbo system isnt goin to add mpgs....and from what iveI beg to differ with those statements. It may or may not help your
>been told...aint gonna do squadoooche for my torque or power.
MPG a bunch, depends on how many hills you have to climb with the
pedal to the floor, just to get over the top or drop a gear or two
and crawl over. A correctly sized and installed turbocharger can
easily double the HP of any gas engine, but it don't come free. More
power means more fuel. I believe that using the extra fuel to climb a
long hill at the speed limit would be more efficient in the long run
than crawling over at 30 mph.
Those big tractors you see at the tractor pulls with 1000+ HP do it
by using multi-staged turbo systems, where one feeds into another. In
cars, where acceleration is important, turbo setups are a compromise
between power and the time to spool up (lag time). It's the lag time
that car folks dislike and the reason they're not used more. Small
turbos spool quickly, but don't give big HP increases, unless you use
a bunch. Some exotic (big $$$) sports cars have 4 and more turbos to
resolve that issue. Some put out 1,000 HP from 8.0L (488 ci). That's
not much bigger than my 440.
Back to the real world and our RV's, even a small 6-8 lbs boost,
which would require no mods to the lower end of the engine, would add
50% or more to the HP and torque. That's a lot of help. I don't care
if it takes a second or two for the turbo to spool up, I'm not going
to be drag racing the semi in the next lane, but I would like to be
able to pass him on the hills and maintain the speed limit, or close
to it, while climbing those hills. If it helps the engine to breathe
better, maybe it can help the MPG a little, it all depends on how
it's set up. Properly set up, at worst, it won't hurt the MPG.
The engines from the 60's & 70's (pre-emission and computer) are
ideal to boost with turbos. There's no computer or anything to worry
about, just plumbing. The bible of turbocharging is "Turbochargers"
by Hugh MacInnes, first published in 1976. I do have my copy. It will
tell you everything you need to know. Now all I need is the $$$ to do it...
Oh, by the way, I had a 1980 Turbo Mustang GT. It was a 4-cylinder
and would out run the V-8 Cobra of the same era. There was no
competition in a road race. With the turbo spooled up and running, it
out accelerated and handled much better, due to a better weight
distribution. I surprised a lot of folks in that car. I modified it
to boost up to 10-12 lbs. Normal max was 8. It would go like the
proverbial bat. I had it for 150K miles and was sorry to let it go,
but not enough room for the kids.
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