Discussion
Lowtimer said:
Of course, simply preventing a turbo engine from boosting doesn't turn it into the normally aspirated engine of the same range. It will almost certainly have lower static compression and therefore be inherently less efficient off boost than the engine built for normal aspiration.
the other issue the 2.5XT suffers from is drive train losses which pushes the consumption down. My wife is similar to the OP and gets about 26 mpgOP you are going to need to change it to a none permanent 4x4 to get better mpg
Lowtimer said:
Of course, simply preventing a turbo engine from boosting doesn't turn it into the normally aspirated engine of the same range. It will almost certainly have lower static compression and therefore be inherently less efficient off boost than the engine built for normal aspiration.
As above, if you "disabled" the turbo it would drive like a turbocharged engine with a broken turbo - it will definitely feel broken and probably won't see amazing fuel efficiency anyway.If your wife is not a quick driver then it's unlikely that she is using anything close to full boost anyway.
aka_kerrly said:
Assuming that the OP has a Forester of the 2002-08 variety a XT turbo manages to average 26mpg with 226hp and the non turbo with 155hp manages 30mpg (info from Parkers)
Keep the turbo
God that's st. I get 26mpg from an e60 545i without trying. 4.4 litre 330bhp v8 for the uneducated.Keep the turbo
Lowtimer said:
Of course, simply preventing a turbo engine from boosting doesn't turn it into the normally aspirated engine of the same range. It will almost certainly have lower static compression and therefore be inherently less efficient off boost than the engine built for normal aspiration.
True but modern direct injected turbo engines are all higher than 10:1 compression, I think. I guess the difference with them is something like 10% more fuel burned when cruising compared to an NA of the same capacity? Anyway it's not a lot compared to older, 8-9:1 turbo engines.I remember seeing an old American advert on YouTube for a car that had a special key that was used in the dash to select or de-select the turbo/super charger. In the advert, the son used the car without the boost then the dad got in and used his key to activate it.
I quite like that idea
I quite like that idea
V8RX7 said:
You're proud that you drive like a Granny
I averaged 13mpg on optimax from my 300bhp 5.0 Griffith.
Nope, but on a run she will do 28mpg. With "enthusiastic" driving, it is somewhat less than that....... The OP is saying his wife is hardly putting the pedal down hard yet still getting similar MPG figures..I averaged 13mpg on optimax from my 300bhp 5.0 Griffith.
Lowtimer said:
Of course, simply preventing a turbo engine from boosting doesn't turn it into the normally aspirated engine of the same range. It will almost certainly have lower static compression and therefore be inherently less efficient off boost than the engine built for normal aspiration.
Many years ago I had a stage 1 sapphire cosworth which was pretty potent and remember once disconnecting the wastegate actuator and leaving it open to see what it was like. It was an absolute dog,and I'd be surprised if it had 100bhp!trickywoo said:
aka_kerrly said:
Assuming that the OP has a Forester of the 2002-08 variety a XT turbo manages to average 26mpg with 226hp and the non turbo with 155hp manages 30mpg (info from Parkers)
Keep the turbo
God that's st. I get 26mpg from an e60 545i without trying. 4.4 litre 330bhp v8 for the uneducated.Keep the turbo
Given a stretch of B road, or A road for that matter, the 545 wouldn't know which way the Forester went.
For the uneducated you understand....
xRIEx said:
ORD said:
You're kidding, right? It's a fking AWD soft-roader! It wouldn't outrun itself, let alone a 5 series.
A forester is a soft-roader?Unless you're talking SH (2008) onward, then yes, they're quite soft.
Edit to add: This is also part of the reason some of us have them... for ORD's response.
Edited by themanwithnoname on Sunday 29th November 21:17
ORD said:
No idea about back the day but recent ones are definitively SUVs
Enjoy - VBH with an Impreza STI and a Forester STI around Angleseyhttps://www.youtube.com/watch?v=2uyPkavo66Y
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