Helpful ReplyHot!95 octane fuel - ECU reset?

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Wollemi
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2018/03/23 23:10:18 (permalink)

95 octane fuel - ECU reset?

I always use super, nearly always Shell V-Power, in my 987.2 Boxster S. Now I don’t want to start yet another discussion of whether this is a good thing or not.
I understand that if I use normal (95) fuel then the engine management will adjust so that the car runs fine with no problems
What I want to know is does the engine management automatically readjust when I go back to using super unleaded?
Years ago, when I had Subarus they had to go to the dealer to have the ECU reset once normal fuel had been used.
Is the Porsche engine management more sophisticated- will it sort itself out or will it have to be reset?
Will simply disconnecting to battery be enough to reset it?
Thanks
RCS
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Re: 95 octane fuel - ECU reset? 2018/03/23 23:18:43 (permalink)
Wollemi
I always use super, nearly always Shell V-Power, in my 987.2 Boxster S. Now I don’t want to start yet another discussion of whether this is a good thing or not.
I understand that if I use normal (95) fuel then the engine management will adjust so that the car runs fine with no problems
What I want to know is does the engine management automatically readjust when I go back to using super unleaded?
Years ago, when I had Subarus they had to go to the dealer to have the ECU reset once normal fuel had been used.
Is the Porsche engine management more sophisticated- will it sort itself out or will it have to be reset?
Will simply disconnecting to battery be enough to reset it?
Thanks



My understanding is the ECU adapts both ways so no need to visit a dealer.  We had a 997.2S usually on 'super' but went on a trip to Southern Ireland - all 95 over there nothing higher sold - it ran fine both over there and back here.  So I would not worry.
 
As an aside and interestingly when we bought the 997 from an OPC not being local I asked if the local Sainsburys down the road was the nearest for super unleaded, answer was no idea we run everything on 95!!  

"If everything seems under control you're just not going fast enough" - Mario Andretti
Richard_Hamilton
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Re: 95 octane fuel - ECU reset? 2018/03/24 09:18:32 (permalink) ☄ Helpfulby JMR 2018/03/24 14:38:46
I don't know if it works on the 987.2, but on a 986 and 987.1 you can reset the adaptation values to the factory setting.  Switch on the ignition for 60 seconds, during which time you must not touch the throttle pedal.  Then switch off the ignition for at least 10 seconds.

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Richard
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JMR
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Re: 95 octane fuel - ECU reset? 2018/03/24 14:40:54 (permalink)
As said above.
I usually use 99 V-Power.
 
I have used 95 on a few occasions and I notice no difference whatsoever.
No extra power, no more economical, just a few extra quid extra to fill up.
 
I'm not saying it won't be slightly better after a few tanks full vs a few tanks full of normal 95.
BJ Innes
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Re: 95 octane fuel - ECU reset? 2018/03/24 17:08:50 (permalink)
Using super premium fuels such as Shell V-Power is not only about performance gains.
 
Using a 99 Ron fuel in your Porsche allows the ECU mapping to advance the ignition timing for a more efficient and cleaner burn. This is particularly relevant on DFI engines where lower Ron fuels can cause a build-up of carbon deposits on exhaust valve stems which can ultimately lead to more serious problems.
 
Super premium fuels also contain detergent additives and lubricants which further improve the longevity of the engine.
 
It's not simply a case of "the car runs just the same on 95 Ron fuel". It's what goes on inside the engine during the suck, squeeze, bang, blow, cycle that separates the 95 Ron from the super premium alternatives.
 
Brian
 
    

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JMR
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Re: 95 octane fuel - ECU reset? 2018/03/24 20:03:46 (permalink)
BJ Innes
Using super premium fuels such as Shell V-Power is not only about performance gains.
 
Using a 99 Ron fuel in your Porsche allows the ECU mapping to advance the ignition timing for a more efficient and cleaner burn. This is particularly relevant on DFI engines where lower Ron fuels can cause a build-up of carbon deposits on exhaust valve stems which can ultimately lead to more serious problems.
 
Super premium fuels also contain detergent additives and lubricants which further improve the longevity of the engine.
 
It's not simply a case of "the car runs just the same on 95 Ron fuel". It's what goes on inside the engine during the suck, squeeze, bang, blow, cycle that separates the 95 Ron from the super premium alternatives.
 
Brian
    



Quite right Brian.
My usual fill up is Shell V Power 99, which is my nearest fuel station to home.
 
My nearest fuel station at work if I'm a bit low is Sainsbury's, so every now and again I stick their Superunleaded in.
Mainly go Shell though.
As you say, I've always been 'sold' on the cleaners that Optimax/V-Power/Nitro/V-Power has in it.
Leaperslair
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Re: 95 octane fuel - ECU reset? 2018/08/06 21:26:43 (permalink)
Having worked in the fuel industry it may surprise some to know all the supermarkets and shell,Esso, etc pull fuels from the same terminals additives are the same ! 
mr pg
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Re: 95 octane fuel - ECU reset? 2018/08/06 22:09:26 (permalink)
We were recently in Italy in our 981 CS. Unable to find anything other than 95, and the car didn't like it at all. Accelerating from speeds in gears I'm used to started to induce pinking we've never experienced elsewhere. Had to change my driving accordingly. Much as we love the lakes/Dolomites, I was glad to find decent fuel on leaving Italy.
Madala
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Re: 95 octane fuel - ECU reset? 2018/08/07 09:45:13 (permalink)
Was that on just one fill up or multiple fills? ........ If it were just the one it could have been contaminated fuel.
Mark_collin1977
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Re: 95 octane fuel - ECU reset? 2018/08/07 10:10:15 (permalink)
We take our 987.1S down to Rome every summer and never had any issues with the fuel in Italy despite there being no super. I will add that I normally go via Germany in search of 105 octane you can get there which does feel more responsive in the car.
Motorhead
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Re: 95 octane fuel - ECU reset? 2018/08/07 13:03:57 (permalink)
Paul,
 
Like all modern engines it has knock-sensors which should signal the DME to retard the ignition sufficiently to eliminate the pinking you describe.
 
Are you certain that yours are functioning correctly?
 
Jeff

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Wollemi
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Re: 95 octane fuel - ECU reset? 2018/08/10 15:33:52 (permalink)
Leaperslair
Having worked in the fuel industry it may surprise some to know all the supermarkets and shell,Esso, etc pull fuels from the same terminals additives are the same ! 




My understanding that that is true for most fuels but does not apply to Shell V-Power. 
Motorhead
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Re: 95 octane fuel - ECU reset? 2018/08/10 17:36:05 (permalink)
There can't be that many fuel supply terminals in the UK and I'm sure I read that although the base fuel is the same, the premium fuel suppliers - BP, Shell, Esso, etc. - include their own additives at the tanker filling stage.
 
It's the proprietary additives that separate the premium suppliers from the supermarkets, who also have their own additive mix.
 
Jeff

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North Bedfordshire
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