G
Guest
Guest
Greetings everyone,
Do any of you good folks know enough about turbocharging to help my
befuddled thinking? I would like to know if there is any advantage to
efficiency in raising boost pressure and intercooling for normal everyday
driving?
Our everyday transport here is the 80 series Landcruiser but I also have a
4runner with 3-litre 1KZ-T engine plus aftermarket intercooler which gets
only occasional use at present. Its a good motor and returns almost 30mpg on
70mph motorway drives and also performs 'quite briskly' when I sometimes
regress to my youth and really put the boot in! When the intercooler was
fitted the boost remained unchanged although fuelling was adjusted to take
advantage of the cooler air. I am wondering if there would be any
significant extra mpg to be had from more boost assuming the vehicle is
driven in the same way? In other words if I only ask for the same power from
the engine will the increased efficiency give me this from less fuel?
I'm not expecting anything miraculous but as the intercooler is already in
place the cost of the modifications would be virtually nothing - and I quite
like the sound of that..... You're probably thinking why don't I just try
it and see what happens - well I would, but I do like to understand the
implications of any fiddling before I do it - just in case I have it all
wrong!
If there are any useful benefits I would probably convince myself that
intercooling the 80 was a good thing, although it would probably take 20
years to recover the cost of a good cooler!
(Using very approximate maths a 1mpg improvement from say 25mpg would save
about ?6 over 40 gallons. At that rate a ?600 invesment in intercooling etc
would take around 100,000 miles! Inflation would help a little but its
difficult to make the case on financial grounds. So I'll justify it in some
other way I guess.....)
Have I missed something or just plainly misunderstood the fundamentals? Your
views will be gratefully received.
Have fun,
John
Do any of you good folks know enough about turbocharging to help my
befuddled thinking? I would like to know if there is any advantage to
efficiency in raising boost pressure and intercooling for normal everyday
driving?
Our everyday transport here is the 80 series Landcruiser but I also have a
4runner with 3-litre 1KZ-T engine plus aftermarket intercooler which gets
only occasional use at present. Its a good motor and returns almost 30mpg on
70mph motorway drives and also performs 'quite briskly' when I sometimes
regress to my youth and really put the boot in! When the intercooler was
fitted the boost remained unchanged although fuelling was adjusted to take
advantage of the cooler air. I am wondering if there would be any
significant extra mpg to be had from more boost assuming the vehicle is
driven in the same way? In other words if I only ask for the same power from
the engine will the increased efficiency give me this from less fuel?
I'm not expecting anything miraculous but as the intercooler is already in
place the cost of the modifications would be virtually nothing - and I quite
like the sound of that..... You're probably thinking why don't I just try
it and see what happens - well I would, but I do like to understand the
implications of any fiddling before I do it - just in case I have it all
wrong!
If there are any useful benefits I would probably convince myself that
intercooling the 80 was a good thing, although it would probably take 20
years to recover the cost of a good cooler!
(Using very approximate maths a 1mpg improvement from say 25mpg would save
about ?6 over 40 gallons. At that rate a ?600 invesment in intercooling etc
would take around 100,000 miles! Inflation would help a little but its
difficult to make the case on financial grounds. So I'll justify it in some
other way I guess.....)
Have I missed something or just plainly misunderstood the fundamentals? Your
views will be gratefully received.
Have fun,
John