98RON or 95RON
Discussion
solidstatelogic said:
They say 98RON is recommended - is this what everyone is using?
I've been filling up with 95RON fuel and the car runs quite fine (Boxster S 987). Just wondered if the 98RON really made a big enough difference to warrant the higher cost?
Yes its octane and the engine is set up to run on what porsche specify. What does it say on your filler cap flap? Dont be tight, bet you would'nt run to well on cheap T-Bags would you!I've been filling up with 95RON fuel and the car runs quite fine (Boxster S 987). Just wondered if the 98RON really made a big enough difference to warrant the higher cost?
Absolutely.
Your Car is set up for 98 ron from the factory . Use Shell V power its the only one that is 98. ESSO & BP are 97 ron.
Your Ecu will have adapted its self to 95 and will have set the timing accordingly to stop any detonation so you wont notice the difference at first. Eventually the ECU will adapt to the 98 Octane but its going to take a very long time( 100 engine cycles I think corect me if i'm wrong). So long as you know your radio/ PCM code disconnect the battery with the key in position 1 ( stops alarm sounding) and the ECU will re-set the adaption values to the factory setting. You will notice a difference then.
Frank
Your Car is set up for 98 ron from the factory . Use Shell V power its the only one that is 98. ESSO & BP are 97 ron.
Your Ecu will have adapted its self to 95 and will have set the timing accordingly to stop any detonation so you wont notice the difference at first. Eventually the ECU will adapt to the 98 Octane but its going to take a very long time( 100 engine cycles I think corect me if i'm wrong). So long as you know your radio/ PCM code disconnect the battery with the key in position 1 ( stops alarm sounding) and the ECU will re-set the adaption values to the factory setting. You will notice a difference then.
Frank
I've been using Tesco 99 since buying the car - but when getting the 964 serviced last month I was told the turbo would prefer Shell v-power and that after a few tanks I'd notice the difference.
I was pretty unconvinced, but did switch to v-power to give it a try. Much to my surprise, there is a noticeable difference - the car seems significant more urgent when I'm in a hurry. MPG is also improved - although I suspect Tesco 99 is still the economical choice.
I didn't expect much difference considering Tesco is 99 anyway - but I won't be going back to Tesco.
I was pretty unconvinced, but did switch to v-power to give it a try. Much to my surprise, there is a noticeable difference - the car seems significant more urgent when I'm in a hurry. MPG is also improved - although I suspect Tesco 99 is still the economical choice.
I didn't expect much difference considering Tesco is 99 anyway - but I won't be going back to Tesco.
Sunnysidebb said:
Absolutely.
Your Car is set up for 98 ron from the factory . Use Shell V power its the only one that is 98. ESSO & BP are 97 ron.
Your Ecu will have adapted its self to 95 and will have set the timing accordingly to stop any detonation so you wont notice the difference at first. Eventually the ECU will adapt to the 98 Octane but its going to take a very long time( 100 engine cycles I think corect me if i'm wrong). So long as you know your radio/ PCM code disconnect the battery with the key in position 1 ( stops alarm sounding) and the ECU will re-set the adaption values to the factory setting. You will notice a difference then.
Frank
are your sure? so if you use one tank of 95ron coz they've sold out of v power u need to start you engine 100 times before it goes back to 98ron mode? that sounds like horse **** to meYour Car is set up for 98 ron from the factory . Use Shell V power its the only one that is 98. ESSO & BP are 97 ron.
Your Ecu will have adapted its self to 95 and will have set the timing accordingly to stop any detonation so you wont notice the difference at first. Eventually the ECU will adapt to the 98 Octane but its going to take a very long time( 100 engine cycles I think corect me if i'm wrong). So long as you know your radio/ PCM code disconnect the battery with the key in position 1 ( stops alarm sounding) and the ECU will re-set the adaption values to the factory setting. You will notice a difference then.
Frank
Diesel130 said:
Shell V-Power all the way.
In Germany and Norway you can get it in 101 Octane too! :-) :-)
Your Porsche is optimised to run on 98 RON, using anything higher will not make any difference whatsoever (unless you up the compression ratio) Using lower ie. 95 RON the knock sensor will retard the ingition slightly and you'll lose some performance.In Germany and Norway you can get it in 101 Octane too! :-) :-)
Tesco is (claim) 99 RON because it contains the max allowable bio ethanol (5%) which comes with it's own potential problems
Edited by Neilpeel59 on Thursday 3rd June 21:58
I think the best example of this was when the missus had her first smart car mk1 1998. They only had a very small tank something like 22 litres. Her words. It's really strange. I get about 250 miles to a tank on unleaded but nearer 300 when I use super unleaded. That sold it to me. I'll let you do the math but her new Brabus Smart averages about 35mpg. WTF
solidstatelogic said:
They say 98RON is recommended - is this what everyone is using?
I've been filling up with 95RON fuel and the car runs quite fine (Boxster S 987). Just wondered if the 98RON really made a big enough difference to warrant the higher cost?
I only ever use Shell V Power in my 997 - I am amazed that someone so obsessed with the reliability of Porsche engines would use a fuel with a lower rating than the manufacturers recommend.I've been filling up with 95RON fuel and the car runs quite fine (Boxster S 987). Just wondered if the 98RON really made a big enough difference to warrant the higher cost?
Seems odd to me.
Nano2nd said:
Sunnysidebb said:
Absolutely.
Your Car is set up for 98 ron from the factory . Use Shell V power its the only one that is 98. ESSO & BP are 97 ron.
Your Ecu will have adapted its self to 95 and will have set the timing accordingly to stop any detonation so you wont notice the difference at first. Eventually the ECU will adapt to the 98 Octane but its going to take a very long time( 100 engine cycles I think corect me if i'm wrong). So long as you know your radio/ PCM code disconnect the battery with the key in position 1 ( stops alarm sounding) and the ECU will re-set the adaption values to the factory setting. You will notice a difference then.
Frank
are your sure? so if you use one tank of 95ron coz they've sold out of v power u need to start you engine 100 times before it goes back to 98ron mode? that sounds like horse **** to meYour Car is set up for 98 ron from the factory . Use Shell V power its the only one that is 98. ESSO & BP are 97 ron.
Your Ecu will have adapted its self to 95 and will have set the timing accordingly to stop any detonation so you wont notice the difference at first. Eventually the ECU will adapt to the 98 Octane but its going to take a very long time( 100 engine cycles I think corect me if i'm wrong). So long as you know your radio/ PCM code disconnect the battery with the key in position 1 ( stops alarm sounding) and the ECU will re-set the adaption values to the factory setting. You will notice a difference then.
Frank
Its up to you, you wont harm the car using 95 ron it will look after its self but don't think it will restore any timing that it has pulled as soon as you put 98 in the tank. Its not even going to loos megga horse power but you wont get the best fuel consumption and it wont pull quite as well. I have some Millers octane improver just in case I cant get 97 super up in the highland and islands.
As I have said have a read up on the topic, better still have a chat with your Porsche dealer. They can also reset the nominal Factory values. However they wont condone using 95 octane fuel.
Edited by Sunnysidebb on Thursday 3rd June 23:01
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