Super Unleaded - Does it actually DO anything?
Super Unleaded - Does it actually DO anything?
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14 November 2005, 08:23 PM
#9
Its down to cars itself...not the fuel 
It only works on cars with active ignition control via a knock sensor. (assuming UK market cars...non of this dodgy Jap import rubbish 
)
No knock sensor or mapping for higher than manufacturers recommended octane = no difference.
Makes a huge difference on an old Jag XJS...but then the ignition is setup to run on 98 4 star...95Ron makes it pink like crazy 
It only works on cars with active ignition control via a knock sensor. (assuming UK market cars...non of this dodgy Jap import rubbish )No knock sensor or mapping for higher than manufacturers recommended octane = no difference.
Makes a huge difference on an old Jag XJS...but then the ignition is setup to run on 98 4 star
...95Ron makes it pink like crazy
Last edited by ALi-B; 14 November 2005 at 09:38 PM. Reason: Smartarse get out clause:D
14 November 2005, 08:25 PM
#10
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Originally Posted by ALi-B
Its down to cars itself...not the fuel It only works on cars with active ignition control via a knock sensor.
It only works on cars with active ignition control via a knock sensor.Like I have said before ... makes CockLinks, well ... only suitable for *****!!
Pete
Last edited by pslewis; 14 November 2005 at 08:38 PM.
14 November 2005, 08:55 PM
#12
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Tesco 99 or Optimax goes in my Leon Cupra R all the time. Dealer put 95 in it once and it ran like poo. But mine has been remapped for it though....
Dave
Dave
14 November 2005, 10:02 PM
#13
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Definate improvement on Super, but didn't the old shape have an ecu less capable? I remember threads popping up one here more than a Subaru in a Lake "how do I reset my ECU??" One of the advantages of moving to the Bugeye I thought.
15 November 2005, 08:26 AM
#15
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Originally Posted by dpb
blow that - vikkis lookin good tonite....
think she has "blonded" up her hair a bit
i would
missed the petrol part and watched it from half way in
15 November 2005, 08:53 AM
#17
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The lower RON fuels will caused the ECU to retard the ignition so you lose the design performance. The danger with a turbocharged car is that low Ron fuels may also cause detonation which is an engine killer! Like No 3 big end failure!
Les
Les
15 November 2005, 09:08 AM
#19
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15 November 2005, 09:50 AM
#20
Originally Posted by JackClark
Definate improvement on Super, but didn't the old shape have an ecu less capable? I remember threads popping up one here more than a Subaru in a Lake "how do I reset my ECU??" One of the advantages of moving to the Bugeye I thought.
The more the car is driven, the more averaged (and in essence, more accurate and safe) the mapping gets. This is how it masks various sensor (partial) failures, because the map is so averaged out, sensor variations no longer create any significant change, the same goes for fuel variations but to a much lesser extent. I belive it is/was part of a main dealer schedule to reset the ECU every main service - that is if they ever bothered. (but might explain the big bang after a service theory too
).
15 November 2005, 09:53 AM
#21
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I run Optimax in my car as it's a better quality fuel. Not for pub talk stats and figures.
My car is a non turbo.
if I had a normally aspirated BMW 540i sport or something like that I'd use Optimax (or super) as well.
Do you use decent oil?? Use decent petrol then.
My car is a non turbo.
if I had a normally aspirated BMW 540i sport or something like that I'd use Optimax (or super) as well.
Do you use decent oil?? Use decent petrol then.
15 November 2005, 10:15 AM
#22
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So we've learned that cars with ECU's that can take advantage of higher octane fuels actually do .... where's everyone been for the past 6 years?
Subaru has always recommended running the turbo cars on 98 RON because they perform better.
Subaru has always recommended running the turbo cars on 98 RON because they perform better.
15 November 2005, 10:55 AM
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Originally Posted by hoskib
forget what fuels best, the STI has just put out 260 something bhp, thought the latest facelift sti was 280 out the box?
15 November 2005, 03:32 PM
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Originally Posted by ScoobyJawa
Thors Dynapack is a hub based dyno so the figures you get are at the hub, not at the fly or wheels