Can a Subaru WRX run on 91 gas?

[Fart]

I know this is not a bike related topic. But i cant be bother going to the Subaru forum and signing up for an account just to ask one question.

With the petrol prices at these levels and my Subaru WRX being as thristy as a fat dog on a hot summers day. I was wondering if it is ok to run by WRX on 91 octane gas? I have no problem running it on 96.

Any car gurus out there?

[Sniper]

If you want the timing to go wonky and the hydrolics to ticcky sure feel free to run 91.
Not a great idea fart, you will be forking out for repairs in no time

[onearmedbandit]

Run it on 96, it'll be better for it and more than likely more economical. I've been involved directly with the used car industry of 10yrs and have seen first hand the differences. In Japan they run closer to 100 octane, so keep it as high as you can.

[sir.pratt]

Soooo, you're trying to get 200kw for cheap huh? Classic - buy a flash fast car, then can't afford to run it!!! Ha ha

Maybe you should buy a corolla. Or use your mum's car. LOL

[scumdog]

Yeah man, try running a 1970 11:1 7 litre engine on 91, good for one block (the engines).

Stick to 'Hi-test' stuff.

[merv]

What does the manual say if you have one? If it says 91 is OK do it.

Otherwise check with Subaru.

[riffer]

My GT-B used to hate 91.

Use the 96 mate.

[SuperDave]

Traitor! Why would you wan't to drive a thing like that when you have a 600?

[FROSTY]

Ill totally agree with OAB --ditto --in the industry for many years
The economics of running 91 just dont work Your best bet is to run the new BP gas --Im hearing really good things about it.

[Drunken Monkey]

Don't run force fed motors on low octane!
Pre-detonation will do bad stuff to your turbine, you may also burn valves. Not good. Don't be a cheapskate.

[HDTboy]

It can be done, but I'd seriously recommend against it.
2c

[Motu]

Pre-detonation will do bad stuff good.

Predetonation?....like,that means normal ign right?

Pre ignition is a combustion event before the spark plug fires.

Post ignition,or detonation is a combustion event after the spark fires.

So I presume Pre Post ignition is situation normal??

[Drunken Monkey]

Predetonation?....like,that means normal ign right?

Pre ignition is a combustion event before the spark plug fires.

Post ignition,or detonation is a combustion event after the spark fires.

So I presume Pre Post ignition is situation normal??

eh? pre-det, auto-det, just other words for 'engine knock'.

Had a few too many burbons tonight, have you?

[Ixion]

Predetonation?....like,that means normal ign right?

Pre ignition is a combustion event before the spark plug fires.

Post ignition,or detonation is a combustion event after the spark fires.

So I presume Pre Post ignition is situation normal??


Well, technically, pre ignition can cause detonation. So maybe it means pre pre ignition. So it's ignition before the before of combustion. They set fire to the oil wells

[Fart]

Soooo, you're trying to get 200kw for cheap huh? Classic - buy a flash fast car, then can't afford to run it!!! Ha ha

Maybe you should buy a corolla. Or use your mum's car. LOL

LOL...

It is not that I cant afford it, but I am careful not to waste my capital.

I do. I end up riding my bike or driving my girlfriends car which has a 1.6 litre engine.. :Punk:

[TonyB]

I've got a GT. The first time I test drove it, the highly dodgy dealership had put 91 in it. I was somewhat underwhelmed. Runs heaps better on 96. And I think better again on 98.

Take my old Bluebird (no- please, take it). It has an ancient 2 valve engine, with no knock sensors etc. It was designed to run on 96- I found that out.... eventually. A mechanic managed to tune it so it would run on 91 without knocking, but it wouldn't pull the skin off a rice pudding, so I ended up driving around with my foot waaaay down just to get it to move. Running on 96 it has heaps more power, so I put my foot down far less. SOOOooooo, it is more economical on higher octane fuel. I imagine your WRX will be the same.

I can drive my GT economically, just remember that if the thing is accelerating 'gently' it is putting out more power than my Bluebird will at full noise-therefore it is burning more fuel. Drive it like you've got an egg under your right foot and it'll be economical. Keep it off the boost.

[stanko]

If you want to save petrol in your car , here is a device that really works

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=7993916387#description

[bungbung]

I had a turbo legacy, it hated 91. On a warm day the ecu would reduce the available boost from 12psi down to 5psi. Stick with 96 or 98

[WRT]

I can drive my GT economically, just remember that if the thing is accelerating 'gently' it is putting out more power than my Bluebird will at full noise-therefore it is burning more fuel. Drive it like you've got an egg under your right foot and it'll be economical. Keep it off the boost.

I've got a GT-B. Thru trial and error, (dunno if the experts can prove it right or wrong, I'm just saying that this is what I have found) I find that I get better economy letting the boost come on, but on a very moderate throttle. The boost from stage one comes in around 2500rpm, but I am upshifting around 3500 to 3800rpm. BUT I am not planting the boot, I'm only pressing the throttle down far enough for the car to gently accelerate, not far enough for it to surge forward.

Seems to give you enough torque to get the 1460-odd kg rolling, without draining the tank in the process. I have never been a fan of shortshifting or changing up before boost comes on, I cant see it being good for the engine, and when I have tried keeping the car off boost, fuel economy actually suffered.

FWIW, I tend to run 98 (mobil - love eftpos at pump - no dealing with queues or "would you be interested in some of our specials?"), or 96 if I'm not near a station selling 98. Never tried 91, "its a high performance machine, so I have to run it on premium . . ." (yeah yeah, I know, no car v. bike flaming please, but bling for the first person to place the quote).

[onearmedbandit]

I've got a GT. The first time I test drove it, the highly dodgy dealership had put 91 in it. I was somewhat underwhelmed. Runs heaps better on 96. And I think better again on 98.




Oh really Tony, do you know after that sale they promoted the saesman to manager? :devil2: :motu:

[TonyB]

Oh really Tony, do you know after that sale they promoted the saesman to manager? :devil2: :motu:
See!? Just goes to show how dodgy they are! I mean, the guy never took his left hand out of his pocket....how rude is THAT??


I have never been a fan of shortshifting or changing up before boost comes on, I cant see it being good for the engine, and when I have tried keeping the car off boost, fuel economy actually suffered. My bad- I didn't quite put it the right way- I do what you do, I still let it rev but I use the accelerator veeeery gently. So it's boosting, but not much. Still accelerates perfectly well but it seems slow because you know what it CAN do.

On a trip from Chch to Nelson and back through the Lewis the GT gave 10k/litre loaded up to the max. And that was with quite a few full noise overtaking manuvers- not gentle driving. I'm happy with that.

[Sniper]

See!? Just goes to show how dodgy they are! I mean, the guy never took his left hand out of his pocket....how rude is THAT??



Bet you he was fiddeling with himself and thinking of how to seduce you :devil2: :rofl: :rofl: :rofl:

[Fart]

You guys are right.

I am gonna keep running it on 96 or 98.

Cheers :-)

[TonyB]

Hmmm, if 91 is crap, 96 is OK, and 98 is good ..... then what would racing fuel be like. (kidding)

[WRT]

Hmmm, if 91 is crap, 96 is OK, and 98 is good ..... then what would racing fuel be like. (kidding)

It would be like, $2 per litre . . .

Mind you, wont be long before we pay that for 91 (already do on GBI).

[TonyB]

It would be like, $2 per litre . . .

Mind you, wont be long before we pay that for 91 (already do on GBI).
$1.751 last time I bought it (about 3 weeks ago). Must be over $1.80 now :oi-grr:
God I love the smell of burnt racing fuel :devil2:

[bungbung]

Hmmm, if 91 is crap, 96 is OK, and 98 is good ..... then what would racing fuel be like. (kidding)

It would be leaded. Your catalytic convertor would die.
Your car will smell like someone farting.

Don't stand behind my car.

[WRT]

$1.751 last time I bought it (about 3 weeks ago). Must be over $1.80 now :oi-grr:
God I love the smell of burnt racing fuel :devil2:

Cheap! Up here I pay $1.90 for it from a BP on the way to woodhill forest. Last time was about 2 weeks ago, so its probably round the $2 mark now . . . v. sucky . . .

[sir.pratt]

$2.10 for avgas now

[raster]

economy is actually better with the higher octane, get an extra 20-50Ks to a tank and the engine doesn't struggle so much.