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Valver - Optimax, Super or Just Unleaded
- Thread starter y0z2a
- Start date
I felt no difference in my 16v when i used optimax !! i just use unleaded !!
car was made to use 95 and 98+ RON is not needed
Mine feels nicer with optimax too! Revs smoother or so it seems! Maybe its all in my head as it costs more!
Valvers arnt much diff between premium and super unless you got a chip which is setup for 97
If you can afford it then run it on optimax but dont worry if you cant!!
I always try to buy the best quality fuel. I dont think that its that crucial to performance and an octane rating over 95 is probably wasted. On the other hand I do like to keep the fuel system clean by using branded fuel with additives in it and change the fuel filter every 15,000 miles or so.
The Jinx
Im with BenH on this one. Had no choice but to fill up with Sainsburys crappy 95 RON the other day so have just put half a tank in til I next pass the Shell garage.
lolQuote: Originally posted by jabba the slut on 29 April 2004
more octane more go! supermarket petrols should be banned
more octane = less likely to r****d at high pressure, 16v was made to run on 95 the RON has nout to do with performance, the extra cleaning things in it may help a little, if you can afford it do it, if not dont worry
hmm.....how many times have we seen this discussion before!
I feel that optimax gives a smoother delivery through the rev range but gives no real noticable difference in performance.
I just get it for the cards because we all know that I am the one who is going to win the £100,000 car!!
Quote: Originally posted by phil6180 on 29 April 2004
hmm.....how many times have we seen this discussion before!
I feel that optimax gives a smoother delivery through the rev range but gives no real noticable difference in performance.
I just get it for the cards because we all know that I am the one who is going to win the £100,000 car!!
Valvers will not remap for extra octane. Theyre too old and a standard valver is not that close to the ragged edge of ignition advance that it needs more octane, which in laymans terms, means the fuel will burn slower. In a valver the only advantage Optimax will have is that you get free cards with it and that it has engine cleaning additives in it. If there is any sense that the engine is performing better, it is totally down to having a filthy engine in the first place, that is slowly coughing its guts up. The octane makes no difference whatsoever.
If you have a more modern car, eg. a 172, or a turbocharged car that youve turned the boost up on, then you can use the extra octane. The only time I used Optimax on my valver was once I started running nitrous through it. Now its turbocharged I cant run it at LESS than 97-98 RON!
Well, to add my tuppence...
I filled the exs tank up 3 times in a row with Super - unknown to her - and about a week later she said "Its running really smoothly recently".
So I would say go for the Super or the Optimax if youre feeling really flush!
(We used to fill up on Sainsburys super by the way, as it was the cheapest round here by a few pence. No problems with it at all from what I can tell!)
Ahhh, but she didnt actually *know* Id put it in until she mentioned that it felt smoother!
I know all the science says no it shouldnt affect it, but it does seem smoother and quieter running!
no, like someone already said it comes from the same refinery as the petrol you might buy in any petrol station. Ages ago I saw a long long and very tehnical thread about this, mainly written by two guys who worked for two different petroleum companies and they were saying the same thing.
Normal 95 RON.
Like people have said 98 makes no diff as the valver has no means to change ignition timing dependant on fuel. And when you use a fuel that goes through pre-flame chanes slower your essentially getting less energy from the burn transferred to the engine.......your choice.
And im not a big fan of using a fuel that ups its RON simply by running a shed load of detegents which they claim keeps your engine clean. There is a space of about 6" where raw fuel actually travels, before that is jsut airand fuel in pipes, after that its all burnt anyway.
^^^thats what im doing at the mo, skint as a mother too so
Mazda MX5 1.8
i use normal about 8 times outta 10
then super sometimes and optimax pretty rarely
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