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Super Unleaded Petrol

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Comments

  • #32
    Shane732
    Registered Users, Registered Users 2 Posts: 4,965 ✭✭✭Shane732


    Marco Ashy Owl wrote: »
    Just to throw a spanner in the work I thing the E5 burns cooler than non ethanol petrol, this can leave carbon deposits on injectors etc and cause some problems like shane said above. I found the 335i ran like crap but the NA car I have now runs great with it.

    Are you using Maxol petrol all the time in the M?


  • #33
    btkm8unsl0w5r4
    Closed Accounts Posts: 9,251 ✭✭✭btkm8unsl0w5r4


    only since my local station went to €1.61..have to say cars running well on it after a few tanks, but it may be that I was driving a 1.6 tdi A3 rental car for a couple of weeks on holidays, which was pretty weak.


  • #34
    conzy
    Subscribers Posts: 6,408 ✭✭✭conzy


    Your putting way to much faith in the software... has the engine ever actually knocked under heavy acceleration? the car always ran like a bat out of hell on 95 ron without issue. Get a good 95 Ron map for it..


  • #35
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    conzymaher wrote: »
    Your putting way to much faith in the software... has the engine ever actually knocked under heavy acceleration? the car always ran like a bat out of hell on 95 ron without issue. Get a good 95 Ron map for it..

    You said yourself that the software was brilliant :P


  • #36
    Drummerboy08
    Closed Accounts Posts: 12,090 ✭✭✭✭Drummerboy08


    MetzgerMeister wrote: »
    You said yourself that the software was brilliant :P

    The other side of it is, whoever actually mapped the car could have knock dectection switched off. It could be down to the map itself.

    You have that car a while now, so if it never actually gave knock before the map then I'd suspect it's something in the map itself.


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  • #37
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    Drummerboy08 wrote: »
    The other side of it is, whoever actually mapped the car could have knock dectection switched off. It could be down to the map itself.

    You have that car a while now, so if it never actually gave knock before the map then I'd suspect it's something in the map itself.

    The only reason I know it's giving knock is because of data logging using the software that the maps are created/flashed with.

    Knock is one of the parameters in the logging profile I'm using.


  • #38
    Seth Brundle
    Moderators, Politics Moderators, Paid Member Posts: 45,524 Mod ✭✭✭✭Seth Brundle


    Drummerboy08 wrote: »
    I've a large amount of work done on this topic.....
    Out of curiosity, what have you done?
    Drummerboy08 wrote: »
    I've found that both the Supra and the Golf ran better when using fuel from either Maxol or Topaz. Both retailers seem to have the best quality and highest octane fuel around.
    Topaz claim to be 95 RON!

    Shane732 wrote: »
    My understanding is that Maxol and Topaz is essentially the same petrol, i.e. E5 petrol.
    it may well be the same (based on suggestions by Summertime) but their websites make quite different claims of their products in terms of octane rating.

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  • #39
    coylemj
    Registered Users, Registered Users 2 Posts: 26,063 ✭✭✭✭coylemj


    Maxol E5 is rated at 99 octane. The octane boost is an unintended consequence of adding ethanol to 95 RON Unleaded because Ethanol has an octane rating higher than unleaded.

    However Ethanol has a lower energy rating (joules/litre) than Unleaded 95 petrol so what you gain on the swings you lose on the roundabout. The octane is boosted but the overall energy rating (joules/litre) is reduced - in the case of Maxol E5 it's 30.5 megajoules/litre vs. 31 MJ/litre for ordinary unleaded so there is a 1.6% reduction in energy per unit of fuel but the knocking problem is solved!


  • #40
    unkel
    Registered Users, Registered Users 2 Posts: 60,760 ✭✭✭✭unkel


    coylemj wrote: »
    Maxol E5 is rated at 99 octane.

    Any E5 (based on 95% RON 95) is octane 99. Afaik it is more profitable for the pumpholder to sell than RON 95, so I do not understand why anybody would still be selling RON 95.

    And the OP doesn't notice knock, it's just the software telling him there is. A logical mind would start pointing the finger at the software here :)
    pa990 wrote: »
    E85 isn't sold any more in this county


    Didn't know that! Bet the owners of all the flexifuel cars are still laughing they got away with the low / no VRT when they bought them...

    "Make no mistake. The days of the internal combustion engine are definitely numbered" - Quentin Willson, 1997



  • #41
    Mycroft H
    Registered Users, Registered Users 2 Posts: 9,306 ✭✭✭Mycroft H


    MetzgerMeister wrote: »
    Drummerboy08 wrote: »
    The other side of it is, whoever actually mapped the car could have knock dectection switched off. It could be down to the map itself.

    You have that car a while now, so if it never actually gave knock before the map then I'd suspect it's something in the map itself.

    The only reason I know it's giving knock is because of data logging using the software that the maps are created/flashed with.

    Knock is one of the parameters in the logging profile I'm using.


    So it's gone from a serious knock to something that the logging software is picking up. I'm with unkel on this one, I would look at the accuracy and the reliability of the software. Occams Razor


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  • #42
    wandererz
    Registered Users, Registered Users 2 Posts: 2,936 ✭✭✭wandererz


    Typically fill up at Topaz or Maxol as they are the only ones close to me.
    Have been adding about 50ml of Millers to a tank every now and again.

    However, added 50ml to approx half a tank the other day and the vehicle seems much smoother and perhaps even has that bit more power which i've been missing the past two months or so.


  • #43
    Gary ITR
    Closed Accounts Posts: 16,800 ✭✭✭✭Gary ITR


    If you're getting knock you won't neccessarily hear it. Tuners use a device called the 'knock box' to detect it. I would doubt the software is an issue it has to be the map itself. Everytime you drive the car you are riskong catastrophic damage.


  • #44
    tipptom
    Registered Users, Registered Users 2 Posts: 4,219 ✭✭✭tipptom


    A little of topic but the consumer show was on last night about laundered diesal garages and right at the end of the piece they just threw in something very rushed about the petrol in these garages as well,something to do with stretching it and ethonol.We have a very cheap place that sells diesal which I would never buy of them but buy their petrol as its about 6c cheaper as i thought safe in the knowledge that they dont interfere with it with no dye through it?.


  • #45
    Wolverine_1999
    Registered Users, Registered Users 2 Posts: 1,013 ✭✭✭Wolverine_1999


    This country is such a complete balls. Not only are we hounded for motor tax, but the amount of tax on fuel is ridiculous on top of the fact that the fuel taxed is the ****ty old 95 fuel.

    Petrol prices are mostly on par with the rest of the Europe and they use 98 as standard. Complete and utter bull**** is this country. Complete and utter..


  • #46
    TDR.ie
    Registered Users, Registered Users 2 Posts: 10 ✭TDR.ie


    E5 topaz or maxol is not 99 octane , it certainly doesn't respond like 98-99 octane fuel regarding knock protection . Its 96 ish at the best


  • #47
    TDR.ie
    Registered Users, Registered Users 2 Posts: 10 ✭TDR.ie


    TDR.ie wrote: »
    E5 topaz or maxol is not 99 octane , it certainly doesn't respond like 98-99 octane fuel regarding knock protection . Its 96 ish at the best

    If you want a great octane booster , mix in 10% methanol with your petrol


  • #48
    msg11
    Closed Accounts Posts: 3,572 ✭✭✭msg11


    I'll be filling up at Apple Green, I feel out with Maxol over there refusal to sell me 5 euros worth of petrol. Also, I though Topaz didn't sell e5 ?


  • #49
    mikeecho
    Registered Users, Registered Users 2 Posts: 5,541 ✭✭✭mikeecho


    msg11 wrote: »
    I'll be filling up at Apple Green, I feel out with Maxol over there refusal to sell me 5 euros worth of petrol. Also, I though Topaz didn't sell e5 ?

    My understanding is that All petrol is at least E5


  • #50
    unkel
    Registered Users, Registered Users 2 Posts: 60,760 ✭✭✭✭unkel


    TDR.ie wrote: »
    E5 topaz or maxol is not 99 octane , it certainly doesn't respond like 98-99 octane fuel regarding knock protection . Its 96 ish at the best

    Just looked into this and you are right.

    Ethanol has an octane of 113. This means that E5 (5% ethanol, 95% RON95) has an octane of only 96. You need E20 to get an octane of 99

    "Make no mistake. The days of the internal combustion engine are definitely numbered" - Quentin Willson, 1997



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