Subaru Turbo Engines

[Graham W]

Yes, but you would still expect the higher power version to require
higher RON fuel, wouldn't you?

Why?

You'd expect each car to be manufactured to use fuel readily available
in the end market.

For example the power figures might actually look like this:

NZ market, 96RON Other market, 98RON
Auto 175kW 180kW
Manual 206kW 215kW

 

[Shane White]

Can anyone explain these strange octane requirements-

Subaru Liberty GT Auto
2.0L Turbo
180kW@6400rpm
310Nm@2400rpm
Required Minimum RON = 98

Subaru Legacy GT Manual New Zealand
2.0L Turbo
206kW@6400rpm
343Nm@2400rpm
Required Minimum RON = 96

Bizarre? The NZ Legacy produces much more torque, yet has a lower RON rating.

Shane.

 

[Dan---]

Bizarre? The NZ Legacy produces much more torque, yet has a lower RON rating.

I think the Auto version has been toned down so the transmission can
handle the power.

 

[Kasper Kowalski]

It is quite common for auto and manual versions of the same motor to
have quite different power and torque characteristics.

Do you have data for the Manual liberty in the same market as the first
car and for the Auto Legacy in NZ?

Yes, but you would still expect the higher power version to require higher
RON fuel, wouldn't you?

KK

 

[Dan---]

I think the Auto version has been toned down so the transmission can
handle the power.

Or more like to handle the Torque.

 

[Losiho]

Why?

You'd expect each car to be manufactured to use fuel readily available
in the end market.

For example the power figures might actually look like this:

NZ market, 96RON Other market, 98RON
Auto 175kW 180kW
Manual 206kW 215kW

I'm surprised that no one has mentioned one simple little fact - the manual
and auto Liberty/Legacy GT have different turbochargers. The manuals have a
Mitsubishi manufactured turbo, the autos and IHI turbo.

 

[Subie25L]

The NZ cars are actually
206kW @ 6000rpm 5-speed manual with 343 Nm @ 2400rpm 96RON
191kW @ 6000rpm 5-speed sportshift automatic with 343 Nm @ 2400rpm 96RON

The Aus cars are
180Kw @ 6400rpm 5-speed sportshift automatic with 310Nm @ 2400rpm 98RON
No manual car in Aus yet

Why are the Aussie cars missing out ?
Is it emissions laws?

 

[Bergerac]

I'm surprised that no one has mentioned one simple little fact - the manual
and auto Liberty/Legacy GT have different turbochargers. The manuals have a
Mitsubishi manufactured turbo, the autos and IHI turbo.

I thought IHI turbos were made by mitsubishi??

 

[imaginuity]

you'll get you're answer from

www.libertyturbo.com

 

[Forg]

The NZ cars are actually
206kW @ 6000rpm ...
191kW @ 6000rpm ... ....
The Aus cars are
180Kw @ 6400rpm ...
No manual car in Aus yet ....
Why are the Aussie cars missing out ?
Is it emissions laws?

....

Basically, yes. NZ has no laws 'cos it has no car industry;
Subaru don't need to do anything to import a car to NZ. In
Australia they have to pass emissions & safety laws; they
might even do it without any hassles, but they just aren't
importing a car which they think won't sell in much volume
yet.

As for 96 octane vs 98 octane; I think 96 is the best NZ
gets, innit? So that's what Subaru quote on. There's
something fishy there though, 'cos STi's brought to
Australia & left unmodified melted pistons on 96 octane, yet
you don't hear of the same thing happening in NZ; it has to
be weather or petrol-quality related.


-Forg

 

[Terry Hollis]

...

Basically, yes. NZ has no laws 'cos it has no car industry;
Subaru don't need to do anything to import a car to NZ. In
Australia they have to pass emissions & safety laws; they
might even do it without any hassles, but they just aren't
importing a car which they think won't sell in much volume
yet.

As for 96 octane vs 98 octane; I think 96 is the best NZ
gets, innit? So that's what Subaru quote on. There's
something fishy there though, 'cos STi's brought to
Australia & left unmodified melted pistons on 96 octane, yet
you don't hear of the same thing happening in NZ; it has to
be weather or petrol-quality related.

In New Zealand, BP Ultimate and Mobil Synergy 8000 are both 98 octane.
While 96 octane is more readily available, there are BP stations selling 98
octane in most places and Mobil are selling 98 octane at selected stations
in the main centres.

 

[Graham W]

Can anyone explain these strange octane requirements-

Subaru Liberty GT Auto ^^^^^^
180kW@6400rpm
Required Minimum RON = 98

Subaru Legacy GT Manual New Zealand ^^^^^^^^
206kW@6400rpm
Required Minimum RON = 96

Bizarre? The NZ Legacy produces much more torque, yet has a lower RON
rating.

It is quite common for auto and manual versions of the same motor to
have quite different power and torque characteristics.

Do you have data for the Manual liberty in the same market as the first
car and for the Auto Legacy in NZ?

 

[y_p_w]

Why?

You'd expect each car to be manufactured to use fuel readily available
in the end market.

One would thing so. However - reading the manual for the 2004 WRX (US),
the current STi is supposed to run on 93 (AKI) octane unleaded fuel.
AKI is the same as (R+M)/2, and pumps here in California typically show
91 for premium unleaded. I'm not sure where anyone is supposed to get
this fuel - I've never seen any, although I suppose it might be available
at a racetrack. I have heard some reports that 93 octane (R+M)/2 fuel
may be available some places in the Midwest US.

 

[No Way]

Compression Ratios

 

[Bruce Hoult]

You'd expect each car to be manufactured to use fuel readily available
in the end market.

For example the power figures might actually look like this:

NZ market, 96RON Other market, 98RON
Auto 175kW 180kW
Manual 206kW 215kW

98RON is readily available from several brands in NZ in the major
cities, though not *everywhere*like 91 and 96 are.

-- Bruce

 

[Jason Kavanaugh]

One would thing so. However - reading the manual for the 2004 WRX (US),
the current STi is supposed to run on 93 (AKI) octane unleaded fuel.
AKI is the same as (R+M)/2, and pumps here in California typically show
91 for premium unleaded. I'm not sure where anyone is supposed to get
this fuel - I've never seen any, although I suppose it might be available
at a racetrack. I have heard some reports that 93 octane (R+M)/2 fuel
may be available some places in the Midwest US.

Our 93 Octane is the rest of the worlds 98 Octane. Stupid if you ask
me, it should all be the same and there is no real discernible reason
I can find that they aren't. I think pretty much everywhere but the
left coast 93 octane is readily available. I've never had a problem
finding it in arkansas, florida, tennessee, kentucky, georgia,
maryland, dc area, missouri, illinois, and wisonsin to name a few
places I haven't had problems finding 93 octane. Here where I live
it's not considered racing gas unless it is at least 100 octane and
then it costs upwards of 5.00 US dollars a gallon.

Jason Kavanaugh

 

[Greg Rudd]

(e-mail address removed) (y_p_w) wrote in message


Our 93 Octane is the rest of the worlds 98 Octane. Stupid if you ask
me, it should all be the same and there is no real discernible reason
I can find that they aren't. I think pretty much everywhere but the
left coast 93 octane is readily available. I've never had a problem
finding it in arkansas, florida, tennessee, kentucky, georgia,
maryland, dc area, missouri, illinois, and wisonsin to name a few
places I haven't had problems finding 93 octane. Here where I live
it's not considered racing gas unless it is at least 100 octane and
then it costs upwards of 5.00 US dollars a gallon.

Jason Kavanaugh

Wasn't the US 87 octane for unleaded in the early days?? Hence huge V8's
with 7.5 to 8.5 compression ratio's I am pretty sure that this was from
1975 through to the mid to late 1980's when they moved up to 98 octane
Cause I know that when unleaded was introduced in Australia 92 octane was
considered quite high for unleaded but that has now changed.

 

[Ken Gilbert]

One would thing so. However - reading the manual for the 2004 WRX (US),
the current STi is supposed to run on 93 (AKI) octane unleaded fuel.
AKI is the same as (R+M)/2, and pumps here in California typically show
91 for premium unleaded. I'm not sure where anyone is supposed to get
this fuel - I've never seen any, although I suppose it might be available
at a racetrack. I have heard some reports that 93 octane (R+M)/2 fuel
may be available some places in the Midwest US.

i can actually get 94 octane @ sunoco here in the northeast US. right
now, about $1.80 - $1.90 per gal.

my rex drinks it up!

ken

 

[y_p_w]

Our 93 Octane is the rest of the worlds 98 Octane. Stupid if you ask
me, it should all be the same and there is no real discernible reason
I can find that they aren't. I think pretty much everywhere but the
left coast 93 octane is readily available. I've never had a problem
finding it in arkansas, florida, tennessee, kentucky, georgia,
maryland, dc area, missouri, illinois, and wisonsin to name a few
places I haven't had problems finding 93 octane. Here where I live
it's not considered racing gas unless it is at least 100 octane and
then it costs upwards of 5.00 US dollars a gallon.

Seriously - here in California there's pretty much a standard of
87, 89, and 91 (R+M)/2 octane. I believe most cars require either
86 or 91. The other thing is that most premium unlead pumps were
labelled 92 octane until three years ago. AutoWeek magazine had
a small piece about where the octane went in California.

 

[Niels]

Do you get a noticeble MPG increase, using the 94 octane? (My 2003 Camry
did best with 89 octane.)