Possible to mix fuels?

  1. Saxperience Post Whore Joined: Apr 2007 Haywards Heath Posts: 8445
    #1
    Is it possible to mix fuels as i have heard sum bullsh*t on this and was wondering? The fuels would be 95octane unleaded and 97ish octane v-power or similar. Surely this would be the same as adding octane booster tho and wouldnt damage engine or car??

    Any help or advice would be spot-on cheers
  2. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #2
    you can mix fuels with different RON's absolutely fine as long as its petrol Otherwise you would have to drain your tank if you changed to v-power from regular!
  3. Saxperience Hardcore! Joined: Apr 2006 Ashford Posts: 25611 LY R26
    #3
    mixing your fuel like that doesnt do your car any harm whatsoever.
    i do it all the time.
    always good to fill up with 97/99 every now and then.
  4. Saxperience Forum Bum Joined: May 2007 Posts: 4857
    #4
    As said mixing is fine. But don’t forget the Saxo was only ever intended to run a cat piss. So sticking good fuel in a standard or near to standard engine does not do much apart from cost you more.
  5. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #5
    Quote:
    Originally Posted by AXracing View Post
    As said mixing is fine. But don’t forget the Saxo was only ever intended to run a cat piss. So sticking good fuel in a standard or near to standard engine does not do much apart from cost you more.
    I worship you.

    i say it time and again and I just get ignored.
  6. Saxperience Post Whore Joined: May 2006 Bedford Posts: 7457 Saxo VTS Peugeot 306 GTI-6 Astra SRI
    #6
    VTS lump will run 95-98 ron and can adjust timing to suite.

    Pricier fuels like V power and Ultimate have better cleaning products in and help keep injectors clean

    Higher RON is a GOOD THING on track, less det and a much lower chance of melting pistons/valve/other assorted engine malark. Worth the £2 for the tank? Yup

    You'll also find that cylinder liners will last longer with more expencive fuel. BMW had a feck load of trouble a few years ago because they assumed that people who bought 328i and 540i models would use super unleaded. In the UK we're tight and mostly don't bother so engines started to go bang. BMW replaced loads of engine and changed the liners from nikle to aluminium.

    95 RON is fine for most models, I'd always stuff V-power in once in a while though to clean it all up.

    V power is the fuel of choice for my VTS and the only thing it drinks most of the time. But then I have no clue about cars/engine etc, I just like wasting my cash.
  7. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #7
    Quote:
    Originally Posted by CampDavid View Post
    BMW replaced loads of engine and changed the liners from nikle to aluminium.
    not doubting you dave but as im a bit of a material science goon im interested in why replacing nickel (which has a high elevated creep resistance) with aluminium (which is comparitively uber shite at elevated temps) has been done. seems counter intuitive innit...

    do you have link or anything related to the retro fits so i can fill my mind with more useless bollocks?
  8. Saxperience Addict Joined: Apr 2006 Frome, down deepest, darkest zummerset Posts: 12971 VTRallye
    #8
    i did this once and it made my car go gammy. but it was shiity tesco stuff no. bp ultimate or v-power.
  9. Saxperience Post Whore Joined: May 2006 Bedford Posts: 7457 Saxo VTS Peugeot 306 GTI-6 Astra SRI
    #9
    For you Ad

    http://www.bmwworld.com/engines/nikasil.htm
  10. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #10
    Quote:
    Originally Posted by CampDavid View Post
    thank you kindly
  11. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #11
    Quote:
    Originally Posted by CampDavid View Post
    VTS lump will run 95-98 ron and can adjust timing to suite.

    Pricier fuels like V power and Ultimate have better cleaning products in and help keep injectors clean

    Higher RON is a GOOD THING on track, less det and a much lower chance of melting pistons/valve/other assorted engine malark. Worth the £2 for the tank? Yup

    You'll also find that cylinder liners will last longer with more expencive fuel. BMW had a feck load of trouble a few years ago because they assumed that people who bought 328i and 540i models would use super unleaded. In the UK we're tight and mostly don't bother so engines started to go bang. BMW replaced loads of engine and changed the liners from nikle to aluminium.

    95 RON is fine for most models, I'd always stuff V-power in once in a while though to clean it all up.

    V power is the fuel of choice for my VTS and the only thing it drinks most of the time. But then I have no clue about cars/engine etc, I just like wasting my cash.

    I started a thread on a similar subject the other day, but didn't get a final answer really...

    I had my car mapped by Chipwizards and at the time, it was running on Shell Optimax, I think it was advertised as being 98RON, can't remember... Anyway, I run my car on BT Ultimate now, time and time again, I've tried filling up with the newer Shell product, V-Power, but it doesn't run as well. It runs smooth like, but it doesn't have the same response as the BP. Do you know why this might be?

    Cheers!
  12. Established Member Joined: Nov 2005 Wirral Posts: 2198
    #12
    hmmmm. this "Shell vs. BP" and which is better could make all the difference on the 0-60 strip!
  13. Saxperience Post Whore Joined: Apr 2007 Haywards Heath Posts: 8445
    #13
    Quote:
    Originally Posted by Toad View Post
    I started a thread on a similar subject the other day, but didn't get a final answer really...

    Cheers!
    Just popular i guess

    lol cheers for all the help saxp-ers, some knowledge out ther
  14. Saxperience Post Whore Joined: May 2006 Bedford Posts: 7457 Saxo VTS Peugeot 306 GTI-6 Astra SRI
    #14
    Quote:
    Originally Posted by Toad View Post
    I started a thread on a similar subject the other day, but didn't get a final answer really...

    I had my car mapped by Chipwizards and at the time, it was running on Shell Optimax, I think it was advertised as being 98RON, can't remember... Anyway, I run my car on BT Ultimate now, time and time again, I've tried filling up with the newer Shell product, V-Power, but it doesn't run as well. It runs smooth like, but it doesn't have the same response as the BP. Do you know why this might be?

    Cheers!
    I have exactly the same issue (or did have until my ECU failed!)

    The honest answer is I don't know.

    Some cars respond better to different fuels and it's a bit odd how they react. My one started to be loads more ecconomical when running German 100 RON V power but never really gets on with the UK stuff so well. When I get the map put back on mine I'll try BP ult to see if it now prefers that!
  15. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #15
    Intersting to know that I'm not the only one... Cheers for that.

    The only thing I could think of was that the V-Power (99 RON) was a little too high, hence loss of power, as in thoery, too high of a RON fuel would lose you power would it not? But if you have noticed that the 100 RON stuff was working well, them I'm a little lost. Perhaps it's just the quality of the drop so to speak, and similarly to what you've already said, it's how your engine deals with it...
  16. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #16
    Quote:
    Originally Posted by Toad View Post
    Intersting to know that I'm not the only one... Cheers for that.

    The only thing I could think of was that the V-Power (99 RON) was a little too high, hence loss of power, as in thoery, too high of a RON fuel would lose you power would it not? But if you have noticed that the 100 RON stuff was working well, them I'm a little lost. Perhaps it's just the quality of the drop so to speak, and similarly to what you've already said, it's how your engine deals with it...

    I was under the impression the standard ECU couldnt adjust the timings to suit anything higher than 97RON. In most cases the ECU wont adjust the map till 2-3 tank fulls of a new fuel being used. using higher RON's should'nt lose you power you just wont get maximum out of it.
  17. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #17
    Are you sure? The higher the RON, the less volitile the fuel is, so I assumed if it was being detonated under the same pressure (a non-tuned / standard compression engine) it might have consequences... Maybe not then...
  18. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #18
    Quote:
    Originally Posted by Toad View Post
    Are you sure? The higher the RON, the less volitile the fuel is, so I assumed if it was being detonated under the same pressure (a non-tuned / standard compression engine) it might have consequences... Maybe not then...
    probs run rougher but otherwise i cant see an overall reduction in power tbh
  19. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #19
    Google time... Hehe.
  20. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #20
    Quote:
    Originally Posted by Toad View Post
    Google time... Hehe.
    my thoughts exactly. just try to filter out the rubbish from modern sports car owners... the cars ECU will no doubt have a wider RON acceptability than the saxo's
  21. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #21
    Slightly off subject... When then likes of Wayne at Chipwizards maps Saxo's / 106's, does he alter the ignition timing? Does he do anything else apart from setting the fuelling throughout the rev range?
  22. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #22
    I'll let campfeatures answer that one as i honestly dont have a clue. although i thought timings was one of the key factors in mapping
  23. Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can
    #23
    True, but if the car alters that anyway, (as mentioned earlier) where does that leave you???
  24. Saxperience Hardcore! Joined: Oct 2005 Aycliffe Posts: 32205 Saxo VTS
    #24
    Quote:
    Originally Posted by Toad View Post
    True, but if the car alters that anyway, (as mentioned earlier) where does that leave you???
    well the ECU (as far as im aware) cant adjust timings beyond 97RON - as the map on the car doesnt cover fuel beyond that 'RONage'

    when you put in (an) uprated cam(s) then the timings will be out of sync with the position of the valves and so the point at which the fuel and air enters the cylinder differs from where the ECU expects it to be. hence why the timings then need to be adjusted (ECU remapped).