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Motors Super Unleaded......

Discussion in 'General' started by -Rx-, 30 Jul 2003.

  1. -Rx-

    -Rx- New Member

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    I was wondering if anyone else uses SuperU instead of the normall watery unleaded???

    I recently started using the 97ron petrol because at first, my car was a little down on power and idling alittle slow. Since ive used this stuff, i found the car to be much more responsive, and iam even getting better MPG's!

    For the extra couple of pence a litre it costs seams well worth it to me!
     
  2. OneSeventeen

    OneSeventeen Oooh Shiny!

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    91 Octane is all I'll put in my truck, although it still doesn't get too wonderful of MPGs :(
    (woohoo sams-club gas!)
     
  3. Dad

    Dad You talkin to me?

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    I never use the 87 octane gas and will nearly always put in 91 or 93 octane. It costs about 3 bucks more to fill the tank, but I also get about 5 more miles per gallon and the engine runs smoother.

    As always lady's and gents, make sure you put in some fuel injector cleaner at least every 3 fillups! :D
     
  4. |V| 4 L k i 3 R

    |V| 4 L k i 3 R Member

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    The highest octane i can find. Around here I think it's about 94 octane. Gotta love having the Turbo cars.

    1991 Eagle Talon AWD 5sp
    1900 Eagle Talon AWD 5sp, gutted, drag car

    In the drag car, I only use C16 gas. I think its something like 116 octane. Good thing it has only a 4 gallon tank. :naughty:
     
  5. Dad

    Dad You talkin to me?

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    Dang, didn't know they made cars way back then :D

    /me ducks
     
  6. |V| 4 L k i 3 R

    |V| 4 L k i 3 R Member

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    and the only reason i actually bought the car was because it had no rust on it. Kinda odd aint it.

    Can your car go 150mph from dead stop in 1/4 mile?
    How a 1/4 mile in 9secs?

    Fun car, I tell you what! :rock: :rock:
     
  7. Johnny Napalm

    Johnny Napalm New Member

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    I only ever use 98RON juice (either Shell Optimax or BP SUL) and wouldn't touch the supermarket sludge with a bargepole. Modern ECU's 'learn' the properties of the fuel you put in and alter ignition accordingly, resulting in better efficiency.
     
  8. penski

    penski BodMod

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    The old rocket fuel (take some 98 octane, add stuff, leave with ~116 octane and chemical burns on your forearms...)

    *n
     
  9. -Rx-

    -Rx- New Member

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    Sainsbury's super unleaded is OK (97ron) aparetnly its supplied by BP anyways....... still, its a shame theres no Optimax garages rounf 'ere :(
     
  10. ChriX

    ChriX ^

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    I've got a choice of Esso or Safeway fuel round here and I always use Safeway because the Esso fuel makes my car run so badly, it hasn't been the same since I tried it.

    So who does super unleaded? Might give it a try next time I fill up.
     
  11. -Rx-

    -Rx- New Member

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    Weird, i used to hate using Esso fuel, had same probs....

    Bigger garages do em, i get mine from Sainsburys (cause when i do my shopping there i get a 4p off a litre voucher!) seams to make my car do a little less rev's to speed, ie 80mph is no longer 4000rpm but 3900.

    Doesnt sound like much, but @ 4000 the cars hits abit of a power band, and uses about 20% more fuel...
     
  12. DJMyst

    DJMyst yeah baby

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    Always used 93 in my cars. In my old Teg, about evry 4-5th tank, I would get half 93 and half 110. Smelled heavenly for about a week too. :D
     
  13. cderalow

    cderalow bondage master!

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    i run 97 in my cars... i have to run 93 in my truck or i blow the cylinder heads (done it twice now) because I get too high of a compression ratio...


    sucks...
     
  14. |V| 4 L k i 3 R

    |V| 4 L k i 3 R Member

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    actually the compretion ratio is already set for your truck. Its the size of the pistons that determine that. What is really happening is that the car is running too lean (too much air/fuel ratio). And as combustion gets leaner, it get hotter. This causes early detonation in mild cases and in serious cases, like yours, it causes the rings to melt and eventually melt the pistons.

    The trick for my car is to get it as lean as possible without blowing it up. :eeek: I would hate to have to build the block again after putting $7k into it.
     
  15. essjaytee

    essjaytee emtarkanderundergunderson

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    On newer cars the knock sensor will retard ignition timing if it detects pinging.

    Generally, on cars that don't require higher octane (which is harder to detonate, and is therefore better for higher compression/boosted motors) it's a waste of money and will often accelerate carbon deposits.

    Read your users manual, and save some money.
     
  16. penski

    penski BodMod

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    Compression ratio is set by the size of gap between the piston at full extension and the head, no?

    Hence why skimming the head or fitting a thinner head gasket ups the compression ratio.

    Mini owners: fit an MG metro head gasket for a cheap power boost ;)

    *n
     
  17. |V| 4 L k i 3 R

    |V| 4 L k i 3 R Member

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    What do you call a newer car?
    Both of mine have them and they are 12 and 13 years old. ;)

    And yes, compression ratio is the gap size. There are many ways to change this ratio. Change pistons, change the gasket, deck the head, bore the block, etc.

    If all you own is like a 4-banger, you are probably better off with lower octane. However, if it is either turbo or supercharged, you want that higher octane.
     
  18. ChriX

    ChriX ^

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    A lot of my mates hate Esso fuel too, so it must actually be different if so many people have noticed.
     
  19. penski

    penski BodMod

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    But if you're using forced induction or modding an enginer to forced induction...Keep that compression ratio down ;)

    *n
     
  20. cderalow

    cderalow bondage master!

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    the problem with running the higher octane is that the detonation is so much higher, so when I say blow the heads... i mean I literally blow them right off... and if it was only $7k i wouldn't feel so bad about it :sigh:
     
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