Tesco fuel?
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Tesco fuel?
After running my Subaru on shell best fuel and then going to tesco and filling up its noticeably slower and less boost is this normal and to be expected?
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I have used Tesco Unlimited in my car since I owned it except once where I used Shell Nitro, I felt my car was slow and sluggish on the Shell. I don't think it was any different but it was most likely in my mind!
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It was tescos best stuff,could it be that it was so finely remapped to run at best on another fuel?because it's defo not as rapid! The same day I out that fuel in was also same day I fitted a afterburner vortex back box but surely that won't make it slower?
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all I can suggest is go back to shell when you run out and see what happens, if it's better then don't use Tesco again!
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I recently fitted a afterburner vortex (angled exit) and noticed it ran slightly better, had a bit more response when pulling away so I don't think it can be that.
all I can suggest is go back to shell when you run out and see what happens, if it's better then don't use Tesco again!
all I can suggest is go back to shell when you run out and see what happens, if it's better then don't use Tesco again!
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They all use the same base fuel but each company use their own mix of additives to make their final product. It's said that tesco use quite a lot more silicone in their fuels than the other big names.
For me, I'll let tesco do the food and shell do the petrol.
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I then had it mapped on T99 and spent 6 months in the US for work only coming back for weekends and trackdays. Where my car was stored, there was only really vPower available readily so I used that... no issue.
Andrew Carr certainly had the opinion that the fuel is very similar, and a map for one is fine for the other.
I think it's more likely that you've got a warmer day or a heavier car or you're just imagining the performance reduction. I'm guilty of it more than most, I'm notorious for chasing boost leaks in my sleep because my car "felt slower" on the way home from work.
With all that said, perhaps there is a problem with the Tesco fuel you used but is specific to that pump on that day. It's not unheard of for a dodgy batch of fuel to turn up at a filling station, and a tightly tuned Subaru may be one of the first cars to notice. Bluntly saying that VPower is better or worse than T99 is inaccurate though, in my experience.
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I honestly don't think that's the case. My car has been mapped a few times now at different stages of tune and I've had vPower in it for the first map when I was using T99 for 90% of my mileage, it drove fine.
I then had it mapped on T99 and spent 6 months in the US for work only coming back for weekends and trackdays. Where my car was stored, there was only really vPower available readily so I used that... no issue.
Andrew Carr certainly had the opinion that the fuel is very similar, and a map for one is fine for the other.
I think it's more likely that you've got a warmer day or a heavier car or you're just imagining the performance reduction. I'm guilty of it more than most, I'm notorious for chasing boost leaks in my sleep because my car "felt slower" on the way home from work.
With all that said, perhaps there is a problem with the Tesco fuel you used but is specific to that pump on that day. It's not unheard of for a dodgy batch of fuel to turn up at a filling station, and a tightly tuned Subaru may be one of the first cars to notice. Bluntly saying that VPower is better or worse than T99 is inaccurate though, in my experience.
I then had it mapped on T99 and spent 6 months in the US for work only coming back for weekends and trackdays. Where my car was stored, there was only really vPower available readily so I used that... no issue.
Andrew Carr certainly had the opinion that the fuel is very similar, and a map for one is fine for the other.
I think it's more likely that you've got a warmer day or a heavier car or you're just imagining the performance reduction. I'm guilty of it more than most, I'm notorious for chasing boost leaks in my sleep because my car "felt slower" on the way home from work.
With all that said, perhaps there is a problem with the Tesco fuel you used but is specific to that pump on that day. It's not unheard of for a dodgy batch of fuel to turn up at a filling station, and a tightly tuned Subaru may be one of the first cars to notice. Bluntly saying that VPower is better or worse than T99 is inaccurate though, in my experience.
Maybe it just my mind and I'm getting use to the power.i tapped into a vacuum line for the boost gauge and the T PIECE and pipe it came with had ALOT smaller internal diameter,could this make any difference?standed pipe is about 6mm and the boot pipe and t piece was 2.5mm
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Maybe it just my mind and I'm getting use to the power.i tapped into a vacuum line for the boost gauge and the T PIECE and pipe it came with had ALOT smaller internal diameter,could this make any difference?standed pipe is about 6mm and the boot pipe and t piece was 2.5mm
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Defo check for leaks if you've been playing with the vacuum pipes.
I made a home-made boost leak detector a few weeks ago out of boredom, basically took induction cone off, capped off the inlet pipe and then used one of the old breather take-offs (catch can so all take-offs blanked) and stuck my compressor nozzle in it.
Only "charged" to 12psi and I had a load of leaks all around the FMIC pipework. 10mins with a spanner and my car felt a load faster.
I made a home-made boost leak detector a few weeks ago out of boredom, basically took induction cone off, capped off the inlet pipe and then used one of the old breather take-offs (catch can so all take-offs blanked) and stuck my compressor nozzle in it.
Only "charged" to 12psi and I had a load of leaks all around the FMIC pipework. 10mins with a spanner and my car felt a load faster.
#25
Mine was a uk fuel remap back when optimax was on the go .Tried momentum had bad idle ,lacked acceleration used more fuel running it doing the same driving style when running shell .Went back to Shell v-power now nitro instant response when accelerating no more bad idle better fuel consumption .
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Mine was a uk fuel remap back when optimax was on the go .Tried momentum had bad idle ,lacked acceleration used more fuel running it doing the same driving style when running shell .Went back to Shell v-power now nitro instant response when accelerating no more bad idle better fuel consumption .
Guess I will just have to burn off this tesco stuff and try v-power again and see if there is any difference
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