SNAKEBITE Posted March 22, 2007 Report Share Posted March 22, 2007 Remember that buisness with the petrol a couple of weeks ago? Well, my Mondeo had developed a judder at around that time. When I accelerated "hard" it used to lurch slightly and then pick up. Anyway I watered it down as much as I could with Shell petrol and it improved slightly, so I just ran it round and tried to use the tank up before refilling. Last night i filled up again from Shell and bingo, no judder at all. Infact the car seems to be performing a LOT better So I have decided never to use Tesco fuel again. Even when it was "good" it isn't as good as Shell. Anyone else had similar thoughts? Quote Link to comment Share on other sites More sharing options...
pin Posted March 22, 2007 Report Share Posted March 22, 2007 I run a diesel now but I used to be younger and more stupid and have all sorts of performance cars. Anyone with a highly strung engine, or one which is tuned or perhaps runs a high boost turbo - they will all stay well clear of supermarket petrol. It makes a massive difference, it causes these kind of cars to "pink" or nock like mad as the engine management system retards the ignition timing to try and compensate for the junk in the tank. The problems seem to be the junk they put in it and the fact that it has a low octane rating, fuel with a higher octane rating resists premature detonation (where the bang happens before the piston reaches TDC). I have owned cars which barely function on 93RON tesco junk, have always stayed away from it myself. Quote Link to comment Share on other sites More sharing options...
Cranfield Posted March 22, 2007 Report Share Posted March 22, 2007 I thought a "judder" when accelerating, was standard performance with a Mondeo. Quote Link to comment Share on other sites More sharing options...
pin Posted March 22, 2007 Report Share Posted March 22, 2007 Now now Cranfield My mate has the 3.0 V6 and that's a very quick car Quote Link to comment Share on other sites More sharing options...
dunganick Posted March 22, 2007 Report Share Posted March 22, 2007 i also get noticeably better economy from the shell diesel, and ever so slightly better performance. However i had my card details stolen at a shell station, so pay cash Quote Link to comment Share on other sites More sharing options...
njc110381 Posted March 22, 2007 Report Share Posted March 22, 2007 I actually found Tesco diesel to be very economical in my pickup, I'm not sure why? I never used their petrol when I had a car, as my dad was in the IAM and it was fairly well accepted that the petrol was cheap because it was of poor quality. I don't use their diesel regularly as a rule, I like BP or Shell if I'm going past. I was stuck in traffic with the fuel light on the other week, so got some from Tesco. Got an extra 100 miles from a full tank, but it was a bit sluggish too Quote Link to comment Share on other sites More sharing options...
Axe Posted March 22, 2007 Report Share Posted March 22, 2007 Its horses for courses. You may get better performance and I certinaly notice adifference when using a premium supplier compared to say Tesco. But on the other hand, premium fuel costs more. So at the end of the dayit doesnt really matter which you use they both cost the same in the long run. Unless of course the fuel is tampered with. Quote Link to comment Share on other sites More sharing options...
SNAKEBITE Posted March 22, 2007 Author Report Share Posted March 22, 2007 But on the other hand, premium fuel costs more. Not in Burgess Hill mate!, Shell is the same as Tescos! I used to use Tescos because it was convienient and I got clubcard points but not any more. The cheapest place is that Esso garage down the the road from you by the Black lion, quality petrol and about 5p cheaper. (Which equates to £2.50 a tank which gives me a saving of about £50 a year!) Quote Link to comment Share on other sites More sharing options...
dusk2dawn Posted March 22, 2007 Report Share Posted March 22, 2007 Remember that buisness with the petrol a couple of weeks ago?Well, my Mondeo had developed a judder at around that time. When I accelerated "hard" it used to lurch slightly and then pick up. Anyway I watered it down as much as I could with Shell petrol and it improved slightly, so I just ran it round and tried to use the tank up before refilling. Last night i filled up again from Shell and bingo, no judder at all. Infact the car seems to be performing a LOT better So I have decided never to use Tesco fuel again. Even when it was "good" it isn't as good as Shell. Anyone else had similar thoughts? Years ago when Noah was a boy there used to be an advertising jingle "Keep going well with Shell" anyone going to be brave enough to admit remembering it? D2D Quote Link to comment Share on other sites More sharing options...
simonp Posted March 22, 2007 Report Share Posted March 22, 2007 I run a diesel now but I used to be younger and more stupid and have all sorts of performance cars. Anyone with a highly strung engine, or one which is tuned or perhaps runs a high boost turbo - they will all stay well clear of supermarket petrol. Mainly true until Tesco came out with their 99 octane fuel. Once I'd filled the M3 with a tank of that, you could definatley feel the difference, not huge, but definatley noticable. On the M3 board, one of the tuning/service companies did an independant report, and found that the Tesco 99 octane fuel gave the E46 M3 CSL 40 more BHP, thats 10% !!! http://www.thorneymotorsport.co.uk/tuning/...t_Results.shtml Like pin, that was in my younger days (which ended 2 weeks ago :-( ), now I drive a diesel (well I will when I finally get it..) Si Quote Link to comment Share on other sites More sharing options...
pin Posted March 22, 2007 Report Share Posted March 22, 2007 Ferarri did similar with which car I forget but the new 103RON stuff compared to supermarket fuel was like 80BHP+ difference. I had my Evo VI GSr tuned to within an inch of its life, yet when I got the chance of trying some decent racing fuel (at the time I think 102RON) it was like a different car. Dyno'd at 35BHP higher than with optimax God I loved that car Quote Link to comment Share on other sites More sharing options...
Highlander Posted March 22, 2007 Report Share Posted March 22, 2007 Wasn't there an old ad for Shell which ran 'things go better with Shell'? or was that Coke Quote Link to comment Share on other sites More sharing options...
SNAKEBITE Posted March 22, 2007 Author Report Share Posted March 22, 2007 I was under the impression that putting the higher octane fuel into something like my Mondeo was pointless as the engine management compensated for the extra oomph and knocked the timing around to compensate, meaning there was no gain. Quote Link to comment Share on other sites More sharing options...
pin Posted March 22, 2007 Report Share Posted March 22, 2007 Depends on the car. What year is the mondeo? Most Ford cars with the EEC IV or better engine management systems have computer controlled timing. They adapt to various conditions and can advance or retard the ignition timing accordingly. Most modern cars are the same, they will advance the timing somewhat and you will see a difference. Like I say if the car is tuned at all it will make more difference, at the very least more octane in the fuel will make it smoother and probably more efficient - what people refer to as more "driveability". Older cars without adaptive engine management systems wouldn't see much benefit. Quote Link to comment Share on other sites More sharing options...
me and my lad Posted March 22, 2007 Report Share Posted March 22, 2007 we always use tescos super in both of our quattros, never had a problem with it and as good as optimax but cheaper !! sounds like you just had a bit of dicky petrol Quote Link to comment Share on other sites More sharing options...
SNAKEBITE Posted March 22, 2007 Author Report Share Posted March 22, 2007 Depends on the car. What year is the mondeo? '97 on a "p". Quote Link to comment Share on other sites More sharing options...
pin Posted March 22, 2007 Report Share Posted March 22, 2007 I'm no expert but I think that is EEC IV, with a PCM (power control module) which is the bit that does what I was on about before. Quote Link to comment Share on other sites More sharing options...
SNAKEBITE Posted March 22, 2007 Author Report Share Posted March 22, 2007 So will I get better "performance" with the Super unleaded? I am judging performance by the fact I can do the same speed with less on the pedal rather than being able to rag it round Tescos carpark with my posse. Quote Link to comment Share on other sites More sharing options...
hawkeye Posted March 22, 2007 Report Share Posted March 22, 2007 Wasn't there an old ad for Shell which ran 'things go better with Shell'? or was that Coke Depends wether you are drinking it or sniffing Quote Link to comment Share on other sites More sharing options...
pin Posted March 22, 2007 Report Share Posted March 22, 2007 So will I get better "performance" with the Super unleaded?I am judging performance by the fact I can do the same speed with less on the pedal rather than being able to rag it round Tescos carpark with my posse. Doesn't work like that, the difference will be slight, a few HP at the most. In theory if you put the car on a dyno you would produce more power for the same engine revs with one than the other. The main difference you will see is smoother, possibly quieter running with a slight increase in economy. Quote Link to comment Share on other sites More sharing options...
dunganick Posted March 22, 2007 Report Share Posted March 22, 2007 Its horses for courses. You may get better performance and I certinaly notice adifference when using a premium supplier compared to say Tesco. But on the other hand, premium fuel costs more. So at the end of the dayit doesnt really matter which you use they both cost the same in the long run. Unless of course the fuel is tampered with. true expect with diesels. Shell are by far the cheapest stations for diesel. I pay 88/89.9 around here in shells compaired to 91/92.9 at esso's etc.... only place that comes close is sainsburys with their city diesel. Which i get a wee less mileage out of, mainly im sure because it dosent pull as well as the shell so i tend to have a heavier right foot. tbh it makes little difference, 1 weeks worth of driving economically can be ruined in a 5miles dash when you feel like a bit of fun. Quote Link to comment Share on other sites More sharing options...
pin Posted March 22, 2007 Report Share Posted March 22, 2007 tbh it makes little difference, 1 weeks worth of driving economically can be ruined in a 5miles dash when you feel like a bit of fun. Exactly my problem. If I am careful I get 50mpg from the audi, but if I hoof it, which I do a lot, that drops to under 40 which kind of defeats the object of having a diesel Quote Link to comment Share on other sites More sharing options...
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