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Old 10-13-2005, 01:01 AM   #1
colombo140
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Default 2.0 WRX, What gas to use?

So I just bought a WRX. It didn't have the owners manual with it. I was wondering what grade gas should I use? What does Subaru suggest? I put premium in tonight and it seemed like it was running a lot smoother but I don't know if I'm just mental or if it actually does help it. Thanks all.
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Old 10-13-2005, 01:07 AM   #2
dust12
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91+ is recommended by the owners manual. It actually does help.
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Old 10-13-2005, 01:09 AM   #3
Sports Wagon
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91+ is not only recommended but required. It does say you can use lower grade but only if no other alternative is there. Emergency use only.
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Old 10-13-2005, 01:12 AM   #4
colombo140
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Sweet! Thanks to both of you! I'm glad I found that out before I put any real miles on her.
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Old 10-13-2005, 01:36 AM   #5
hondaeater69
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I use 94 which is the higest i can find at the pump around here. I would recommend the same.
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Old 10-13-2005, 02:44 AM   #6
hotrod
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Where you live, in hot summer weather run the highest octane you can find locally.
The engine needs extra octane in very hot weather to give its best performance.

If your into that sort of modification, WI is very effective in the desert southwest.

Larry
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Old 10-13-2005, 02:59 AM   #7
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hmm...if your car is running a lot smother now, it makes me wonder what the previous owner used. Low grade gas can kill compression and eventually kill the engine...literally.

I'd suggest getting an owners manual cause it come in handy a lot.

Enjoy your new ride!
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Old 10-13-2005, 03:06 AM   #8
00Maddog
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yes high octane is worth the money. i only wish i could get 91+ in alaska, our gas is worse than cali's.
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Old 10-13-2005, 11:20 AM   #9
colombo140
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Quote:
Originally Posted by hotrod
Where you live, in hot summer weather run the highest octane you can find locally.
The engine needs extra octane in very hot weather to give its best performance.

If your into that sort of modification, WI is very effective in the desert southwest.

Larry
Larry,

Whats this WI? I've never heard that before.
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Old 10-13-2005, 11:22 AM   #10
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Quote:
Originally Posted by wrxskier18
hmm...if your car is running a lot smother now, it makes me wonder what the previous owner used. Low grade gas can kill compression and eventually kill the engine...literally.

I'd suggest getting an owners manual cause it come in handy a lot.

Enjoy your new ride!

Honestly I have no idea what the guy ran in her but I've put about 800 miles on it since I got it and the initial tank was 93. After that I was using the cheap stuff since it was almost $3 bucks a gallon even for the crap and I just didnt know any better. Thanks for your input and everyone elses too.
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Old 10-13-2005, 11:36 AM   #11
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Quote:
Originally Posted by colombo140
Larry,

Whats this WI? I've never heard that before.
I'm assuming he talking about water injection. Do a search, tons of info.
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Old 10-13-2005, 12:00 PM   #12
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91-93...i prefer 93
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Old 10-13-2005, 12:07 PM   #13
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I use 93. Some local Sunoco stations carry 100 at the pump. That will really get your car running!
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Old 10-13-2005, 12:11 PM   #14
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hey buddy when u go to fill up gas, look on the inside of the gas door. mine says premium only
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Old 10-13-2005, 12:16 PM   #15
AphexDouble
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where do you get 93? Anyone is SoCal?
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Old 10-13-2005, 12:31 PM   #16
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If I used c16 (116 Oct) will be better or worst on my stock wrx??
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Old 10-13-2005, 12:38 PM   #17
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Wont make a difference.....car is tuned for 91/93 only./
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Old 10-13-2005, 12:47 PM   #18
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Quote:
Originally Posted by AphexDouble
where do you get 93? Anyone is SoCal?
In a different state
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Old 10-13-2005, 01:38 PM   #19
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always use the best, TEH BEST! ALWAYS!
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Old 10-13-2005, 04:07 PM   #20
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Quote:
Originally Posted by drivin blind
I'm assuming he talking about water injection. Do a search, tons of info.

Awesome... Thanks.
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Old 10-13-2005, 04:14 PM   #21
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in most cases the higher the octane the better
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Old 10-13-2005, 04:15 PM   #22
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If you use c16, (tuned for c16 of course) will you sacrifice the life of you stock motor??

How much more power could you expect to make on c16 (with tune) with an 18g, full exhaust, and supporting mods (including the present tune for 93)?
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Old 10-13-2005, 04:28 PM   #23
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Quote:
Originally Posted by Blackboxracing
If you use c16, (tuned for c16 of course) will you sacrifice the life of you stock motor??

How much more power could you expect to make on c16 (with tune) with an 18g, full exhaust, and supporting mods (including the present tune for 93)?
Sacrafice the life of the motor? Not if well tuned for it.

As for your second question, the Proven Power forum would be better.
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Old 10-13-2005, 10:47 PM   #24
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Yes WI == water injection (see also alcohol injection) lots of posts in these forums.

Great way to increase effective octane.

You can get significantly more power out of C16 but it is a leaded fuel and hard on your O2 sensor (not to mention expensive).

The likes and will use higher octanes to a point. The performance difference expecially in hot weather and heavy load/boost between 91 octane and 93-94 octane is pretty noticable, mostly in midrange torque as the engine generally ends up pulling timing in that area first. I have used 100 octane unleaded in the summer with good results, the car loves it but my wallet does not.

I am now experimenting with E85. (search --- serveral threads here too)

Larry
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Old 10-14-2005, 12:17 AM   #25
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a tune from 94- 116 could yield 100+ horsepower. but thats on a tune, on just a standard car, their is not a huge difference, you will notice more low end power
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