Is 87 octane acceptable for VW 1.8T?

Discussion in 'OT Driven' started by willm1, Sep 20, 2005.

  1. willm1

    willm1 They say, shark in it for the moneys.

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    I always run premium in my VW Jetta 1.8 turbo as that is what I've done with previous turbocharged cars, but is it totally necessary in this case? It's an '01 (they increased boost pressure in 03) and it's completely stock. Would it be safe to run 87? Would the ecu just bump back timing and make a little less power? Gas is really expense these days, so I'd like to save where I can, but not at the expensive of my car's health.
     
  2. ecofire

    ecofire Member

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    It's probably not a good idea with a turbo. I wouldn't run anything less than 91 with a turbo unless the owner's manuals says otherwise.
     
  3. MrBucket

    MrBucket OT Supporter

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    umm no you only run high octane with a turbo
     
  4. Maliboost

    Maliboost New Member

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  5. Maliboost

    Maliboost New Member

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    you'll loose fuel economy with the power you'd loose from retarded timing
     
  6. nikocb

    nikocb New Member

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  7. Y2kAccord

    Y2kAccord Everything happens for reasons I just dont know

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    Friend of mine has a 98 A4 and he runs 87 through his with no problems
     
  8. Dr. Woo

    Dr. Woo Guns don't kill people

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    Is $4.00 per fill-up worth peace of mind?
     
  9. yo vanilla

    yo vanilla New Member

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    "no problems" is a term that most people use very subjectively ;)

    short answer is NO. 1.8t takes premium for a reason, and that is because with forced induction you need a slower burning fuel. higher octane = slower burn. with more air being crammed into your engine, you run a greater risk of detonation by using a lower octane fuel. detonation = bad. now, modern cars have anti-knock sensors which detect "knock" or "pinging" which are signs of detonation, and they will pull back the ignition timing to compensate. the result is less power, and lost fuel efficiency. so in the end, a guy who has zero sensitivity in his right foot and therefore might say he has "no problems" running a lesser fuel in his car, really has no idea what he is missing. that doesnt mean he's doing the best thing for his car though.
     
  10. iNteGraz92

    iNteGraz92 trolling apple sackriders is just too damn easy

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    how about 89? :mamoru:
     
  11. vbp6us

    vbp6us New Member

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    put octane booster and you'll be ok.
     
  12. yo vanilla

    yo vanilla New Member

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    octane booster isn't really the same thing, and besides, the $5 you spend on the octane bottle would be the extra you would have spent on the premium gas anyway.

    what i don't get is, whats with all the cheapskates? is $5 gonna break you? :confused:
     
  13. Y2kAccord

    Y2kAccord Everything happens for reasons I just dont know

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    he told me the Timing would adjust for the lower octane.

    They did a Dyno test on lower octane fuel on a Modified Porsche and only lost 7HP due to lower octane.. I would gladly give up 7hp to save a bunch of money on cheaper fuel. Saw no other adverse effects
     
  14. deznutz

    deznutz New Member

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    i have to put 93 oct in my tank because im chipped
     
  15. yo vanilla

    yo vanilla New Member

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    you lose more than just a few hp; you lose responsiveness as well. the cars dont run quite as smooth. or apparently i'm the only one in this thread with sensitivity greater than a brick :noes: . lol i know you're wondering, and yes i've done this before. i dont find the difference in price to be greater than the difference in drivability.

    not to mention, we havent even touched on the detergent differences between gas grades, and those alone are worth the extra price :)
     
  16. yo vanilla

    yo vanilla New Member

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    derek?
     
  17. Bassheadjazz03

    Bassheadjazz03 OT Supporter

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    Dude, if you do the math, its like a $4 difference between a full tank of 93, and a full tank of 87...Once you've put in $35 worth, $4 aint shit. "Cheaper" fuel isnt really that much cheaper. And you're fucking yourself in the long run.
     
  18. Y2kAccord

    Y2kAccord Everything happens for reasons I just dont know

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    Dyno test I saw proved otherwise.. where are you getting your information?
     
  19. yo vanilla

    yo vanilla New Member

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    wtf are you talking about lol, you just said that the dyno showed a negative 7whp difference so... what do you mean it proved otherwise? :squint: beyond that you've got a engine that isn't running at its optimal smoothness and, hey i'll say it again, lack of detergents in low octane gasoline.

    my info comes frm my own real world experiences, but then again i'm the only one around sensitive enough to feel the difference lol french tickler :p
     
  20. deznutz

    deznutz New Member

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    ?
     
  21. Y2kAccord

    Y2kAccord Everything happens for reasons I just dont know

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    Both my cars say to use premium 91 too, and neither have seen over 87 Not one problem or pinging or any performance issues. Someone wants to diagree with me I want to see where they are getting their info.
     
  22. Dr. Woo

    Dr. Woo Guns don't kill people

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    Um...how about the companies who build these freaking engines? Seems like a pretty good source for info...

    How much good would it do them to require higher-octane fuel in their engines if they don't need it for better performance and reliability? None, that's how much. Engines requiring lower-octane fuel are a bonus, because you can buy the cheap stuff without worry. It's a good advertising point.

    I mean seriously, who buys a car with an engine that says to use a certain octane of fuel, then disregard this and use lower-octane fuel anyway?
     
  23. Ivy Mike

    Ivy Mike New Member

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    If they've never seen anything higher than 87 octane, how do you know there aren't any performance problems?

    You are missing out on the performance the motor can deliver. An engine not performing to its potential IS a problem.

    My 2.0 GTI doesn't say I have to use premium, but the heat we get here in the summers pretty much makes it a requirement. Pinging is not a good thing even for just a moment before the ECU detects it and yanks the timing.
     
  24. antiyou

    antiyou OT Supporter

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    I thought all 2.0's took regular. 1.8T's and VR6's need 91+
     
  25. yo vanilla

    yo vanilla New Member

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    thought maybe i knew you from college; i had a friend named derek we called deez nuts
     

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