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Old 08-15-2001, 07:37 PM   #1
2002wrx1
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Default Unichip Octane Requirements/Octane Boosters?

Anyone know what the octane requirements are for the Unichip?
Or is that programmed at user request? I also have a chip in
my Turbo Beetle which Requires 92 or 93 octane. On a recent trip into Wyo. and Colo. I was only able to find 91 octane. Kept pouring in the octance booster but aint sure it was that effective?
Suggestions in regards to octane and boosters appreciated.
LP
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Old 08-15-2001, 09:25 PM   #2
K-WRX
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Post RE: Unichip Octane Reqt.

I asked Mark @ TurboXS about this when I placed my order for the Unichip. His response was that so far, his MAPS are based on the 93 Octane they run there.

I have the same problem with only 91 Octane available in KS (unless I mix in race gas). Mark indicated that he would try to work up some MAPS with 91 Octane for those of us who can't get anything higher.

Maybe some of those who already run the Unichip with less than 93 Octane could provide some comment on their experience.

Andrew
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Old 08-15-2001, 09:44 PM   #3
HonduhEater
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I would be interested to hear those experiences myself
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Old 08-15-2001, 10:43 PM   #4
gossamer_monster
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My maps were created with 93 in mind. Thats the only octane I`ll put in with or without the chip.

Maybe something can be done with the programming about not have a higher octane the 91 in your area? I suppose if there is enough demand for it they would create 91 octane specific maps?

Bill
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Old 08-15-2001, 11:27 PM   #5
PunksWRX
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Here in Colorado it is nearly impossible to find fuel with octane any higher than 91. There are a couple of places with 93, but they are few and far between. When I had my truck I was told by a reputable Ford technician that because of our altitude we could run at the lower octane with no problem but I don't think this would apply to a turbocharged car. Mark has done some high altitude Unichips for JaMa and Nmyeti. Maybe they can fill us in on the fuel requirements and what he did for their mapping.

Punk
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Old 08-16-2001, 12:57 AM   #6
SuicidalLabRat
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All of Kalifornia has moved to the Nazi refineries new 91 octane 'Super'. The pitch being that it would save money;
Thats true of course...

...just doesn't save the consumer any money.

Mapping for 93 is likely to cause advance/knock issues once here in 91 land. Maybe if you add a viscus additive to help unify the flame front...

??

SLR-
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Old 08-16-2001, 01:44 AM   #7
boostaholic
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Default your kidding me right?

Octane boosters are a FUQN JOKE. Almost as much as a JOKE as the main ingredient, MMT. If you SERIOUSLY think that your gas isnt good enough, goto your local Sherwin Williams (cheapest source) and buy 1 gallon of Xylene and pour in in your gas tank and call it a day and thank me later. Xylene is a true hydrocarbon with the octane rating of 117. Octane boosters are the biggest joke, you will be lucky if they raise your overall octane by 1.
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Old 08-16-2001, 08:53 AM   #8
RiftsWRX
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OH... FWIW... My little fuel additive experiment we were all talking about a month ago is still running really good! Fuel economy is through the roof!!! Even with REPEATED floggings. FYI it took about 3 tanks of gas for the computer to finally adjust to it!

Also gave me a lot more timing due to the octane boost.

For those not remembering what it was... it was GTA fuel enhancer. 2 Fluid oz per 15 gallons. 64 fill ups for ~$60 and so far... it works great. Over a thousand miles on this stuff... so for those in the upper elevations give it a try.

EDIT: Boost- I prefer tolulene personally

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 08-16-2001, 09:35 AM   #9
MJSpiers
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Hmmm...

I'm pretty sure that using 91 octane fuel at alititude will be totally fine with the TurboXS UniChip - reason being you can get away with *less* octane the higher in altitude you go...

So, 91 at 6,000ft is the equivalent to 93 at 0 ft. I cannot for the life of me think of a reason why a turbocharged car would be any different...

Just my .02

Mike.
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Old 08-16-2001, 11:20 AM   #10
Wave
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So, 91 at 6,000ft is the equivalent to 93 at 0 ft. I cannot for the life of me think of a reason why a turbocharged car would be any different...

With an NA car at altitude, the same volume of air is sucked into the motor. This volume contains less oxygen then the same volume of air at sea level. This means that the car will run rich and thus safe.

However, with a turbo car, the car is measuring absolute pressure and using the turbo to pack in the same mass of air (and thus oxygen) into the cylinder. However, because the turbo has to compress more volume to get the same pressure, it has to work harder, thus heating the charge more. This added heat, along with the thinner air dropping intercooler efficiency, actually raises the chance of detonation.

boostaholic: Tell me more about Xylene. I've heard a little bit about it, but never got the whole story. TIA
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Old 08-18-2001, 02:58 AM   #11
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It's oxygen per cubic foot Wave. Just because you're making XXpsi at altitude doesn't mean the charge air had the same oxygen content as XXpsi at sea level. At altitude charge air we be comprised of less oxygen and the octane requirement goes down. Kind of like where you need more octane to run Nitrous...the relatively high oxygen content requires it. You're right about compressor efficency suffering with altitude though.

Homebrew Octane Boosters

Andrew...another pointer for us Wichita folk. They have 93 octane at a place called "Jump Start." Take West Street north until it curves around to the right and turns into Central right by 235. The gas station will be on the right.

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11.82@116.1
93 Octane & Plain Radials
1997 Mitsubishi 3000GT VR-4
Bone Stock...
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Old 08-18-2001, 11:15 AM   #12
K-WRX
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Thumbs up Re:93 Octane

Quote:
Originally posted by 1QUIKV6
...another pointer for us Wichita folk. They have 93 octane at a place called "Jump Start." Take West Street north until it curves around to the right and turns into Central right by 235. The gas station will be on the right.
...
Thanks for the info!!
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Old 08-18-2001, 12:42 PM   #13
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I know all of California is into 91 octane land....

Still remember the good ol days when I was in turboxs' land (MD)
plenty 93 octane Amocos and a good amount 94 octane Sunocos

I have to remember to mention that when I get my uni-chip...

T.
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