97/99 Ron Petrol?

Years ago, all SUL was 98RON IIRC, perhaps the rules are just old?

You should test on T99, or Enduro or something I believe its now called - at least then you won't end up with anything worse.
 
mejinks said:
Rubbish. If your car is mapped to accept 91-97 ron, putting in higher is a total waste of time. As for cleaning agents, that depends on the brand. Some like to put all sorts in, but its like using redex on every tank, you will only see the benefit once.
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So how is what i said rubbish? :rolleyes:
 
shrek2 said:
Hi are there any benefits to using higher octane petrol or are they for performance cars only?
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If your car was mapped to run on high octane petrol then running it on lower octane petrol will cause it to retard itself to prevent detonation and lower power, i.e my 1997 Prelude SiR was mapped to run on 100RON but the UK version (the VTi) was mapped for 95RON and has 12 bhp less, running the UK car on super unleaded will not increase its power as it was mapped for 95RON but running mine on 95RON will decrease its power as it lowers its timings to prevent detonation.




shrek2 said:
Also is Tescos 99 ron better than Shells?
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No, nowhere near, Tescos 99 achieves the 99RON rating by being 5% octane booster (an additive put into petrol to increase its RON, 5% is the most they are allowed to put in petrol by law) so although it is 99RON and will not cause detonation in a car that required that octane the actual petrol content of Tescos 99 is lower than something like V-Power.
 
I have run my CTR on both shell v-power and normal unleaded. On the v-power it did seem more 'responsive' however this could be my mind playing tricks on me, it did run better in the winter and I did get slightly better MPG
 
beermonster said:
This test seems to result in 99 being slightly better than V Power

http://www.thorneymotorsport.co.uk/tuning/Fuel_Test_Results_Update.shtml
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I'd take that with a huge pinch of salt considering who sponsors their racing team cars.

CSLCup_Brands_06.jpg
 
infact there's no difference to the ron used between 97 and 99, there was a good review that fifth gear did, the ron isn't how much power increase you will get, it dictates the knock rating, by having more octane means you can run a hotter engine. ie more boost in a turbo car before it knocks, its only turbo cars that benefit from the higher octane. don't waste you money there's no difference in mpg AT ALL

http://www.oregon.gov/ODA/MSD/docs/pdf/gas_octane_guide.pdf?ga=t

 
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"MAY" being the operative word there

like i said turbo'd cars or ones with high compression ratios, like a hemi engine on a American car for example will benefit more, look at the link of you tube i added

also read the second page, second paragraph, which says

you should note: the
recommended gasoline for most
cars is regular octane. In most
cases, using gasoline with a
higher octane than is recommend
for your vehicle offers absolutely
no benefits.
For a small percentage of
vehicles, the engine knocks when
using the recommended octane. In
these rare cases, it may help to
use a higher octane. Sometimes in
these cases, however, the vehicle
simply needs a tune-up.
Do not spend unnecessary
money purchasing higher than
recommended octane gasoline for
your vehicle. In this brochure you
will find valuable information
explaining what octane is and
how to ensure you are purchasing
the correct grade of gasoline.
Click to expand...
 
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with knock control on almost any modern engine you should be able to run it on almost anything.

if its not mapped for beyond 95ron then the only thing youll gain is from the calorific value of the fuel, which cant be much of a gain.
 
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