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For a couple of weeks since we've been back from Le Mans, I've thought I had a problem with the car. It really wasn't pulling through the revs like it should.
Initially I thought it was the fact that I had spent a weekend in some really quick cars, but alas it was not to be .

I started to drive it carefully just in case there was a boost leak problem or something that would be made worse.

This weekend I decide to give it a good go and the pull is back again in all gears and it flies through the mid rev range.

Looking back there is only one difference that I could work out. Petrol.

The day before we went to Le Mans, my car was in the garage being fixed. I didn't leave much petrol in it, plus the test drives they would have needed to do left me with not enough to get to the closest Optimax outlet. I thought back for a while and a couple of people sweared by ESSO SUL as it 'had a higher MON rating than Optimax' IIRC, so I filled up to the top just to see what it was like.

Well, to be honest, it could have been just a dodgy tank full, but I'll never be buying the stuff again.

Discuss.....

Most interesting, I had the same thing a few weeks back, when my car didn't seem to have the same grunt as normal. I put it down to the weather warming up a few degrees, but then found out that the missus stuck normal unleaded in the tank (I always fill up with Optimax and Millers). Seems like my ECU didn't like cheap petrol and pulled the plug on my performance (so much so that I was out there with my VAG-COM checking for boost leaks, DTC's etc.. I even carried out a TBA and checked my BPV's)

Ah, the thrill of S4 ownership

biturbo wrote:For a couple of weeks since we've been back from Le Mans, I've thought I had a problem with the car. It really wasn't pulling through the revs like it should.
Initially I thought it was the fact that I had spent a weekend in some really quick cars, but alas it was not to be .

I started to drive it carefully just in case there was a boost leak problem or something that would be made worse.

This weekend I decide to give it a good go and the pull is back again in all gears and it flies through the mid rev range.

Looking back there is only one difference that I could work out. Petrol.

The day before we went to Le Mans, my car was in the garage being fixed. I didn't leave much petrol in it, plus the test drives they would have needed to do left me with not enough to get to the closest Optimax outlet. I thought back for a while and a couple of people sweared by ESSO SUL as it 'had a higher MON rating than Optimax' IIRC, so I filled up to the top just to see what it was like.

Well, to be honest, it could have been just a dodgy tank full, but I'll never be buying the stuff again.

Discuss.....

Personally i think its the fact that you had been sat in a range of awesome cars that wekend and your body couldnt re ajust to the lack of power

Cheers
jr

Honestly feel that some of the more dodgy garages just put ordinary unleaded in the super tanks I run my AMG daily hack on Optimax but if I can't find a petrol station selling it, use Esso. I filled it in Slough a couple of weeks ago and could not work out why the car felt like it had lost 100 bhp. The car continued to behave this way until I was able to fill it again locally with Optimax, the difference was quite remarkable to put it mildly, within a couple of miles I was back to my normal non-standard 400 bhp and single figure fuel consumption. It is always the mid range where the power disappears from, when the Kompressor is working its hardest. I have made a mental note not to use anything else but Optimax unless I am stuck, I know in Ireland you only get 'super unleaded' in Shell stations, they do not have Optimax

why not keep a bottle of octane booster in the boot, so then on the off chance you have to stick in normal petrol you will at least keep the rafing up.

Karl.

mini7racer wrote:why not keep a bottle of octane booster in the boot, so then on the off chance you have to stick in normal petrol you will at least keep the rafing up.

Karl.

I use that anyway!

i managed to get hold of some of the gear that the tanker drivers put into normal UL to make it SUL. i got 5 litres form a friendly tanker driver fdor nowt!

i add it to SUL liberally - does the bizzo! no knock and lots of pull in my modded scooby wrx.