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930s rule the wasteland
 
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Porsche Crest Is 93 octane ok for a 80 930

my fuel lid says 98 octane ,is 93 ok ?
The car runs fine im just wondering if i should raise the octane?
Pete
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Old 01-31-2007, 12:28 PM
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it is 98 ron which is different from the american r+m/2 method. I have a neighbor who is a fuel buyer for the military. he informed me that 98 ron is about the same as 91 octane. I had the same question when I bought my carrera the sticker in it says the same thing. one other thing about octane boosters, if the bottle says it will raise the octane 3 points that means it takes it from 91 to 91.3 not 94 so it ends up being pretty useless. I think Steve Wong posted a thread on this a while back.
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Old 01-31-2007, 12:34 PM
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Incorrect. The European ~98 RON rating is the equivalent to the USA ~94 PON (Pump Octane Rating = the average of the RON & MON rating).

Keep an eye on your A/F's under heavy load to verify your fuel is OK.
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Old 01-31-2007, 12:41 PM
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I can only get 93 up here so I fattend my mix to 4% CO and I keep my timing back one degree.. 'course I have no intercooler and I'm a chick*****... I'm guessing your OK but get your A/F checked on a dyno for piece of mind.
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Old 01-31-2007, 12:51 PM
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we dont have 94 in our area ,can i get away with 3 bottles of octane booster on a full tank?
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Old 01-31-2007, 04:09 PM
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Octane boosters are ***** - put it this way, you can't polish a turd All you'll do is waste money and foul up your plugs much quicker!

Either use better fuel, or lower your boost.

If your fuel lid says 98 octane and your car is a genuine US car, then that's strange. I'd say your car is a gray market import, from Europe or something? If so, 93 octane would be fine. It's close enough to the 98 RON rating.

But as we said earlier, just get your car on a dyno to verify your A/F's across various rpm/load points to make sure you're in the clear with your 93 Octane fuel.

If you can't hear it pinging on hard accleleration, then you're OK, but then again, sometimes pinging is inaudible, so the best precaution to take is get that car strapped to a dyno my friend

EDIT: OR invest in a good & accurate Wideband O2 Controller & Gauge
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Old 01-31-2007, 05:11 PM
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yes it is a euro car , no the car runs unreal .I just dont want to the hurt the car with the wrong fuel.
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Old 01-31-2007, 05:18 PM
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As I said, strap an A/F wideband gauge to it to verify you're in the clear... I'd say you are

I've run up to 1.3bar on 98RON / 94 PON, and I've been fine
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Old 01-31-2007, 06:17 PM
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Most people equate 98 RON with 93 to 94 R+M/2. This isn't necessarily correct for all fuels, but it's probably close.

I used to run 93 in my stock '80 turbo, with no problems. Now, all I can get in this area is 91. I had the timing backed off about 4 degrees and all is well again.

If you can get 93 from a reputable source, you're probably fine. If you buy your gas at whatever station is cheapest at the time, I'd suggest backing the timing off a little, as I've seen lower octane gas sold from the higher octane pumps, once or twice. Yes, it's against the law but there are a few dirtbags out there.

If you are stuck with alcohol in your gas, or the other (reformulated) crap, I'd also adjust the timing. You won't notice a big drop in performance.

As others have said, a can or two of octane booster will do nothing useful for you.

JR
Old 02-01-2007, 05:25 AM
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thanks for all the info,helpfull and greatly appriciated
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Old 02-01-2007, 06:42 AM
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You can always buy a 55 gallon drum of race fuel... 104 octane and blend it.. I have a Sunoco dealer that will ship the stuff.. it isnt cheap... But it does give the car a very nice boost.

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Old 02-01-2007, 12:50 PM
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Quote:
Originally posted by jwmarc
You can always buy a 55 gallon drum of race fuel... 104 octane and blend it.. I have a Sunoco dealer that will ship the stuff.. it isnt cheap... But it does give the car a very nice boost.
Not without a very nice boost in boost too
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Old 02-01-2007, 12:54 PM
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soooooo whats not cheap? how much with shipping
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Old 02-01-2007, 03:02 PM
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Last time I looked 104 race gas was about 6 bucks a gallon if you buy it at the race track. I imagine that if you have a 55 gallon drum delivered it would add at least 20 or 30 dollars for delivery to the 55 gallons so an additional ~50 cents a gallon. I think it would take some of the fun out of driving if you had to pay 6.50 a gallon ...
Old 02-02-2007, 05:47 AM
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Not to mention that I don't think I'd feel very safe having *that* much fuel being stored at the house.
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Old 02-02-2007, 09:40 AM
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Quote:
Originally posted by sand_man
Not to mention that I don't think I'd feel very safe having *that* much fuel being stored at the house.
Yeah, my Homeowner's Association would love me...
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Old 02-02-2007, 09:18 PM
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In the UK we would have to have a licence to store that.
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Old 02-02-2007, 11:09 PM
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well i only do light welding in the garage
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Old 02-03-2007, 05:07 AM
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Quote:
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well i only do light welding in the garage
LMAO!
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Old 02-03-2007, 12:38 PM
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jokes
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Old 02-03-2007, 01:25 PM
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