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Old 10-19-2009, 09:12 PM   #1
wrxnoob10
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Default just to clarify...

on the new wrx's is it ok to use 93? i heard yes, i heard no, i heard its pointless, and i heard you would need to reprogram the ecu. i'm confused. any advantages?
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Old 10-19-2009, 09:37 PM   #2
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on the wrx its optional. on the sti its mandatory. i always used 93 in my 08 wrx. now at stage 2 with a 93 octane tune that is my only option. i always thought a little extra octane was better than not enough in our cars.its up to you.
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Old 10-19-2009, 09:59 PM   #3
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If you buy a performance car, use 93. If its "too expensive" dont buy a performance car.
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Old 10-19-2009, 10:01 PM   #4
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Quote:
Originally Posted by wrxnoob10 View Post
any advantages?
Protection against detonation.
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Old 10-19-2009, 10:02 PM   #5
snook07wrx
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I use the cheep stuff, usually 86 or 87, But I always pour in a redbull after every fill-up, adds like 15-20 hp...
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Old 10-19-2009, 10:08 PM   #6
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93 is not "optional" Its a turbocharged vehicle. 91 is the MINIMUM, and its only called the "minimum" because it will "work" without breaking pistons bone stock. Realistically, if you want to protect the health of your motor, 93 is the minimum. And you WILL make more power on 93 than you will on 91. Subaru's turbocharged cars, show repeatable gains with zero tuning up to around 100 octane. So yes, its most defintely not pointless. The difference between 91 and 93 is a big chunk of timing. Timing that makes power.


86-87 is actually harmfull to the engine. Dont take my word for it, open the gas cap and look for the lable or read the manual. Or take myword for it. I have seen the pistons out of a motor that ran 87 for about 20k miles, the tops of the pistons looked like you hit them with a 12gauge shotgun there was so much damage from detonation.



And I know why people ask this question, and no offense but its about the dumbest logic you can use.

Here is why.


The difference between 87 octane and 93 octane is about 20 cents.

An average fillup will be about 11 gallons.

SO we are looking at a difference $2.20 per tank of gas.

The average person will fill their tank up 4 times a month.

SO we are looking at a difference of $8.80 a month.

4 times a month, times 12 months means 48 fillups.

Lets just give it the benefit of doubt, and say 60 fillups.

The HUGE savings, the life changing, make or break your ability to pay your bills by using cheap gas, is

























$132 a year.




If you cant afford that, you cant afford a car with a pricetag higher than about $1500 or so.



$132 a year savings, if you use 87 octane. F0r that $132 that you save, you get to have a good solid 20whp less, if not 30+ less. (Remember, that HP number that Subaru advertised on your car, was done on clean 93 octane) You also get constant low level detonation that slowly erodes your pistons, slowly lowering compression.



And like I said, your ECU will keep giving you more timing up to around 100 octane. WHich means, there is power to be had, with ZERO tuning, by using up to around 100 octane fuel.

Last edited by Defiant Autospeed; 10-19-2009 at 10:17 PM.
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Old 10-19-2009, 10:10 PM   #7
snook07wrx
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^^^yeah, but i doubt he was using it w/ redbull...

(I use 93...)
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Old 10-19-2009, 10:18 PM   #8
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By the way, those people that told you its pointless, and told you that you have to reprogram the ECU, do yourself a huge favor, never, EVER listen to anything they have to say about your car, ever again.
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Old 10-19-2009, 10:19 PM   #9
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Quote:
Originally Posted by snook07wrx View Post
^^^yeah, but i doubt he was using it w/ redbull...

(I use 93...)

No I know, but you would be suprised over the years how many people I have seen that WERE using 87.

I try to word my stuff to cover all bases. Because you never know who will be reading it, and how they will understand it. So I go into a lot of detail and cover any concerns that I think someone may take seriously for whatever reason
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Old 10-20-2009, 11:36 AM   #10
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I want to know who these average people are that fill up their car only 4 times a month...
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Old 10-20-2009, 11:40 AM   #11
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Originally Posted by Boostinbildo View Post
If you buy a performance car, use 93. If its "too expensive" dont buy a performance car.
i second that!
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Old 10-20-2009, 11:44 AM   #12
danny77
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On almost every car ive owned its been 91 or 93 .. might as well spend the extra 10 cents for the better gas its worth it for your ride
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Old 10-20-2009, 11:58 AM   #13
Rxsti7
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god damn i hate CA
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Old 10-20-2009, 12:13 PM   #14
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93 is not MANDATORY. SOA would have a hard time selling any STi's in areas where 93 is non-existent and still cover warranties. Lots of STI's in my area, nearest 93 octane pump is 250-300 miles away.
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Old 10-20-2009, 12:15 PM   #15
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Originally Posted by rkramer View Post
93 is not MANDATORY. SOA would have a hard time selling any STi's in areas where 93 is non-existent and still cover warranties. Lots of STI's in my area, nearest 93 octane pump is 250-300 miles away.
You have 93 or 91 close to your area. 250-300 miles you have a hard time to sell that to me.

The car requires Premium gas which 91 or 93 classifies as.
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Old 10-20-2009, 12:31 PM   #16
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93 may not be mandatory, but 91 is.

And if you datalog the car, you will see why "the highest octane you can get at the pump" is what you need. Like I said, up to around 100 octane the ECU will adjust for and get you more power.


Dump 2 gallons of tolulene in the tank next time before you fill up and see what happens.

(completely safe, tolulene content is in most cases the only difference between 91 and 93 octane anyway) 2 gallons of tolulene in a tank of 93, will get you right around 95.5-96 octane.

Or pump 3-4 gallons of E85 into the tank THEN fill up with whatever 91 or 93 you use. If you only have 91 octane, but ALSO E-85, 3 gallons of E-85 then fill up the rest with 91, you will be shocked at the difference it makes. Even with 93 it makes a big difference.
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Old 10-20-2009, 01:06 PM   #17
StealthfishWRX
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+1 for the always better octane.
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Old 10-20-2009, 01:07 PM   #18
fulltimeW.O.T.
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Quote:
Originally Posted by Boostinbildo View Post
If you buy a performance car, use 93. If its "too expensive" dont buy a performance car.
end of discussion.
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Old 10-20-2009, 01:26 PM   #19
Colbc
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Quote:
Originally Posted by rkramer View Post
93 is not MANDATORY. SOA would have a hard time selling any STi's in areas where 93 is non-existent and still cover warranties. Lots of STI's in my area, nearest 93 octane pump is 250-300 miles away.
Quote:
Originally Posted by fellstar View Post
You have 93 or 91 close to your area. 250-300 miles you have a hard time to sell that to me.

The car requires Premium gas which 91 or 93 classifies as.
ND only has 91 octane and I think I saw 92 once. Additionally, it has a reasonably high ethanol content making it the same price or cheaper than the regular. Kind of weird to someone who just took a job there.
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Old 10-20-2009, 03:36 PM   #20
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Originally Posted by exrage View Post
I want to know who these average people are that fill up their car only 4 times a month...
<Raises hand> I average about 10,000 miles per year in my STi and usually only fill my car once per week.
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Old 10-20-2009, 03:52 PM   #21
casper1jr
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god damn i hate CA
I'm with you on THIS^ one!! CA f'n sucks
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Old 10-20-2009, 03:53 PM   #22
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Like Dave mentioned you can see gains without tuning higher then 93 octane. On a road trip to pittsburgh I had access up to 95-96 octane and I could long the ECU advancing ignition timing. I couldnt ness. FEEL the power difference but I'm sure there were some.

If you have 93 octane in your area I would take advantage of it...
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Old 10-20-2009, 04:02 PM   #23
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Quote:
Originally Posted by AndyH View Post
<Raises hand> I average about 10,000 miles per year in my STi and usually only fill my car once per week.
<Also raises hand>

I can one up AndyH. I drove 4100 miles last year in my WRX.

I have a work vehicle. I live within walking distance to the bars. And my g/f lives with me. I usually put gas in my Subaru once a month...
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Old 10-20-2009, 04:15 PM   #24
CynicX
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Quote:
Originally Posted by rkramer View Post
93 is not MANDATORY. SOA would have a hard time selling any STi's in areas where 93 is non-existent and still cover warranties. Lots of STI's in my area, nearest 93 octane pump is 250-300 miles away.
Quote:
Originally Posted by fellstar View Post
You have 93 or 91 close to your area. 250-300 miles you have a hard time to sell that to me.

The car requires Premium gas which 91 or 93 classifies as.
Quote:
Originally Posted by Defiant Autospeed View Post
93 may not be mandatory, but 91 is.

And if you datalog the car, you will see why "the highest octane you can get at the pump" is what you need. Like I said, up to around 100 octane the ECU will adjust for and get you more power.


Dump 2 gallons of tolulene in the tank next time before you fill up and see what happens.

(completely safe, tolulene content is in most cases the only difference between 91 and 93 octane anyway) 2 gallons of tolulene in a tank of 93, will get you right around 95.5-96 octane.

Or pump 3-4 gallons of E85 into the tank THEN fill up with whatever 91 or 93 you use. If you only have 91 octane, but ALSO E-85, 3 gallons of E-85 then fill up the rest with 91, you will be shocked at the difference it makes. Even with 93 it makes a big difference.
We all know its not VITAL. But that doesnt make it not a requirement...

"STI Manual, Chapter 7-2

-WRX-STI

The 2.5-liter turbo engine is designed to operate using super premium unleaded gaslone with an octane rating of 93 AKI or higher. If super-premium unleaded gasoline with an octane rating of 93 AKI or higher is not available, premium unleaded gasoline with an octane rating of 91 AKI or higher may be TEMPORARILY used. For optimum engine performance and driveability, it is REQUIRED that you use super-premium grade unleaded gasoline with an octane of 93 AKI or higher.

NOTE: Be sure to use super-premium unleaded gasoline of 93 AKI or higher for WRX-STI. If other gasline (lower than 93 AKI) is used, knocking, reduced output and poor accelerator response will result."

Well they pretty much say its a requirement. Now your engine wont blow up, hell it wont blow up on 87 octane. Timing will be pulled enough. There have been datalogs posted with no knocking on 87 at full boost on a stock turbo WOT.

So saying 93 octane isnt a requirement is technically true. However if you say that you cant say 91 octane is a requirement. The engine will pull timing if you use 91, 89, 87 all the same.

The question should be is there a benefit to running higher octane fuels. And the answer would be yes you'll get more power from the engine with a better margin of safety against detonation...

EDIT: The long I saw was a fairly stock WRX on 87 octane. I would avoid this in any case. Esp. if you have an STI...
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Old 10-20-2009, 04:15 PM   #25
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Quote:
Originally Posted by Defiant Autospeed View Post
93 may not be mandatory, but 91 is.

And if you datalog the car, you will see why "the highest octane you can get at the pump" is what you need. Like I said, up to around 100 octane the ECU will adjust for and get you more power.


Dump 2 gallons of tolulene in the tank next time before you fill up and see what happens.

(completely safe, tolulene content is in most cases the only difference between 91 and 93 octane anyway) 2 gallons of tolulene in a tank of 93, will get you right around 95.5-96 octane.

Or pump 3-4 gallons of E85 into the tank THEN fill up with whatever 91 or 93 you use. If you only have 91 octane, but ALSO E-85, 3 gallons of E-85 then fill up the rest with 91, you will be shocked at the difference it makes. Even with 93 it makes a big difference.
I believe toluene is spelled with one L sir.

Im one of those people who fill up once a week, 4 times a month. (shell 92 for the 5 years ive owned my car)
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