Do you use super unleaded in your Aston?
Discussion
My dealer said they always put in normal unleaded, so I've done that whilst running in, thinking it would keep the power down.
I did some fairly unscientific comparisons of super and normal unleaded with other cars, and it gave about 10% better economy with super. The tesco stuff however, used more with their high octane, so I stopped wasting money on that. There was a recent comparison done by the Sunday Times and they found the same result.
Don't know if there is a correlation between better economy and better power, but its likely, a modern engine will run the timing as far advanced as possible, to give better efficiency, and use knock sensors to retard the timing if the fuel isn't up to the job.
I did some fairly unscientific comparisons of super and normal unleaded with other cars, and it gave about 10% better economy with super. The tesco stuff however, used more with their high octane, so I stopped wasting money on that. There was a recent comparison done by the Sunday Times and they found the same result.
Don't know if there is a correlation between better economy and better power, but its likely, a modern engine will run the timing as far advanced as possible, to give better efficiency, and use knock sensors to retard the timing if the fuel isn't up to the job.
wel they have to make rated power on 95 RON so anything more is a bonus
otherwise youd have complaints and litigation for selling engines that are down on power as they need 98 or 100 ron to make the power
makes it easier for aftermarket guys to do quick n dirty remapts onto 98 only, bump the rev limit 500Rpm and claim "+25bhp" for £1000
the engine does have a knock sensor so will adjust for whatever fuel you put in, withing a range of tolerance...so yeah, 98 ron make give a few more bhp if you run a through tanks through it...but not really noticiable on the old arse dyno
otherwise youd have complaints and litigation for selling engines that are down on power as they need 98 or 100 ron to make the power
makes it easier for aftermarket guys to do quick n dirty remapts onto 98 only, bump the rev limit 500Rpm and claim "+25bhp" for £1000
the engine does have a knock sensor so will adjust for whatever fuel you put in, withing a range of tolerance...so yeah, 98 ron make give a few more bhp if you run a through tanks through it...but not really noticiable on the old arse dyno
EBruce said:
Please don't take this the wrong way- but if this is an issue, I hear the Cygnet gets better gas mileage.....
Wouldn't been seen dead in a Cygnet 
cost isn't really an issue but as it will be my daily driver I don't want to have to hunt for super unleaded if there is no benefitI do put 99 or 98 in from time to time, but then I dont pay for my fuel...depends on whats on offer and what mood im in....cant say ive ever done any real scientific testing though...I dont think I can drive 2 tanks of fuel the same without having use of a test track, so its a bit tricky
I have read real test results on other cars with aspirated engines, similar, and it really was like 1 or 2% gain at best
..unless you mod the intake, exhaust, and remap to take advantage of it...
now turbo engines are differnt and show really good gains on higher RON fuel, 10-15% is relatively easy, hence the huge industry that sprung up for diesel remapping
I have read real test results on other cars with aspirated engines, similar, and it really was like 1 or 2% gain at best
..unless you mod the intake, exhaust, and remap to take advantage of it...
now turbo engines are differnt and show really good gains on higher RON fuel, 10-15% is relatively easy, hence the huge industry that sprung up for diesel remapping
IMHO I would use only Shell V-Power. It burns cleaner, it takes less ignition for the same performance, or more performance because it can utilise the ignition advance curve that it was designed to use [BMT] it will deliver better MPG, will it offset the costs ? Possibly not all of it. I only use V-Power in my bikes, why--they both run almost 12:1 compression ratios.
Oh and the Aston runs 11.3:1.
As for Tesco 99 or whatever they call it now. I wouldnt use it to light a barbeque, too much E85 in it [think its Ethyl anyway]
Just my 2d worth of course. Your cars, your money etc
A
Oh and the Aston runs 11.3:1.
As for Tesco 99 or whatever they call it now. I wouldnt use it to light a barbeque, too much E85 in it [think its Ethyl anyway]
Just my 2d worth of course. Your cars, your money etc
A
Chipchap said:
IMHO I would use only Shell V-Power. It burns cleaner, it takes less ignition for the same performance, or more performance because it can utilise the ignition advance curve that it was designed to use [BMT] it will deliver better MPG, will it offset the costs ? Possibly not all of it. I only use V-Power in my bikes, why--they both run almost 12:1 compression ratios.
Oh and the Aston runs 11.3:1.
As for Tesco 99 or whatever they call it now. I wouldnt use it to light a barbeque, too much E85 in it [think its Ethyl anyway]
Just my 2d worth of course. Your cars, your money etc
A
+1 on that .Oh and the Aston runs 11.3:1.
As for Tesco 99 or whatever they call it now. I wouldnt use it to light a barbeque, too much E85 in it [think its Ethyl anyway]
Just my 2d worth of course. Your cars, your money etc
A
The so called cheaper petrol places , does seem to cause the O2 sensors to foul up, seeing more and more cars with emission service light on coming in , then finding they need O2 senors , ask what fuel they use etc, defo a pattern appearing.
I can understand the logic and some of the science of the Shell fuel, which is good, and if I have an option I do fill up with it
but taking the pragmatic approach, I reckon most people change their cars so often these days, that spending £££ more money on extra oil changes with fancy oil, and putting the best fuel in....for 10-20K miles then selling it ...well, its nice to know owner number 7 when its got 120K miles on the clock will have a better engine and less issues LOL
its just extra money out of your pocket to give it "the best" for someone elses benefit in 5-10 years time.....
but taking the pragmatic approach, I reckon most people change their cars so often these days, that spending £££ more money on extra oil changes with fancy oil, and putting the best fuel in....for 10-20K miles then selling it ...well, its nice to know owner number 7 when its got 120K miles on the clock will have a better engine and less issues LOL
its just extra money out of your pocket to give it "the best" for someone elses benefit in 5-10 years time.....
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