Crown

Board: Porsche Language: English Region: Worldwide Share/Save/Bookmark Close

Forum - Thread

    Jul 10, 2012 9:21:06 AM

    Itsme
    Veteran
    Itsme
    Loc: Munich , Germany
    Posts: 995, Gallery
    Registered on: Jun 22, 2003
    Reply to: RCA

    Re: Low octane fuel!

    First: I am no automotive engineer so I can only tell you things customers told me.

    I am aware that our cars can use 95 octane fuel because the ECU recognizes that quality. We need that feature to visit our neighbor countries (we lose HP and we need more fuel using 95 octane, so that is not the right way to lower your fuel bill ;-)).

    I didn’t know until today that the ECU is able to recognize more than 98 octane. I was told that this feature isn’t integrated (probably the automotive industry didn’t want to spent money while developing the car).

    And maybe another reason for not supporting V-Power: at least in Germany you can have some trouble when your car has more power than officially claimed (i.e. insurance)

    Jul 10, 2012 9:24:08 AM

    TB993tt
    Rennteam Pro
    TB993tt
    Loc: manchester , United Kingdom
    Posts: 2280, Gallery
    Registered on: Jul 22, 2002
    Reply to: Itsme

    Re: Low octane fuel!

    Itsme:

    Sorry, an engineer working on engine development told me that no car has an (original) ECU which adapts more than 98 octane. Maybe now ECU versions has changed, my information is 4-5years old.

     

    You have missed the point well made by RC, it is not the ECU adapting to the 100+RON it is the fact that the onset of knock is delayed and as he said when intake temperatures rise the high octane fuel will delay the onset of knock compared to lower octane at the same temperature so maintain the timing advance, boost and hp.

    It was a proprietary secret but since it seems no tuners have proven capable of programming the Porsche VTG engines properly it doesn't have to be..... A specific test was carried out on a VTG engine under controlled conditions on the engine dyno using different octane fuels and this engine proved extremely sensitive to Octane used, losing 50hp when 95RON was tested and actually benefitting from 100RON. The new electronics/sensor set ups are that much more sensitive on the newer Porsche turbo engines.   

    Here are the explicit instructions from the tuner and this is for a mild 635PS tune on a 997GT2, everything is programmed using 98RON.

     


    --



     

    3.9  GT2 2011 make over

    Jul 11, 2012 1:37:06 AM

    W8MM
    Rennteam Master
    W8MM
    Loc: Cincinnati, OH , United States
    Posts: 3997, Gallery
    Registered on: Aug 8, 2003
    Reply to: TB993tt

    Re: Low octane fuel!

    When I go to Mid-Ohio race track for a track event, they have Sunoco 98 (R+M)/2 octane unleaded race gas available for about $8.00/gallon from a standard credit-card-operated pump.


    --

    Mike

    Carrera GT + Tesla Roadster 1.5 + Panamera Turbo +  BMW Z8 + BMW 3.0 CSi + Bentley Arnage T + GT3 RS 4.0

    Jul 11, 2012 8:20:39 AM

    RCA
    Rennteam Administrator
    RC
    Loc: Rennteam HQ , Germany
    Posts: 59607, Gallery
    Registered on: Mar 26, 2002
    Reply to: W8MM

    Re: Low octane fuel!

    8 USD a gallon? Ouch. Ouch. Another Ouch. angel

     


    --

    RC (Germany) - Rennteam Editor Porsche Panamera Turbo S, BMW X5M, Mercedes C63 AMG Coupe PP/DP, Mini Cooper S Countryman All4

    Jul 11, 2012 6:15:19 PM

    HeavyMetalThunder
    Co-Pilot
    HeavyMetalThunder
    Loc: CH , Switzerland
    Posts: 164, Gallery
    Registered on: May 24, 2009
    Reply to: RCA

    Re: Low octane fuel!

    RC, question for you..

    You mentioned earlier that Ethanol mixed fuel is a no-no..

    I was driving thru germany a few days back, and stopped at an Aral station. They had 102, but they all seemed to be mixed with ethanol, so i skipped it, and drove judiciously for another 30 km till i could feed the thirsty car some Shell 100.

    Any ideas if Aral 102 is safe for the 911 ( for future reference) ?

    Thanks!

     

    Jul 11, 2012 7:22:37 PM

    easy_rider911
    Rennteam VIP
    easy_rider911
    Loc: London , United Kingdom
    Posts: 22190, Gallery
    Registered on: Nov 8, 2004
    Reply to: HeavyMetalThunder

    Re: Low octane fuel!

    I have used Aral Ultimate 102 many times in Germany. No problem at all!


    --


    997.1 C2S     GT Silver/Cocoa, -20mm/LSD, PSE, short shifter, SportDesign rims, Zuffenhausen pickup, BMW Z4 2.5i Roadster Sterling Grey/Red

    Jul 12, 2012 10:10:24 AM

    RCA
    Rennteam Administrator
    RC
    Loc: Rennteam HQ , Germany
    Posts: 59607, Gallery
    Registered on: Mar 26, 2002
    Reply to: HeavyMetalThunder

    Re: Low octane fuel!

    HeavyMetalThunder:

    RC, question for you..

    You mentioned earlier that Ethanol mixed fuel is a no-no..

    I was driving thru germany a few days back, and stopped at an Aral station. They had 102, but they all seemed to be mixed with ethanol, so i skipped it, and drove judiciously for another 30 km till i could feed the thirsty car some Shell 100.

    Any ideas if Aral 102 is safe for the 911 ( for future reference) ?

    Thanks!

     

     

    1. Up to 10% ethanol is safe for the 997 and 991 according to Porsche (E10 uses in Germany 10% Bio-Ethanol but it is 95 octane only).

    2. Aral Ultimate 102 does not contain Bio-Ethanol but Bio-Ether. It should be perfectly safe for the 997 and 991.


    --

    RC (Germany) - Rennteam Editor Porsche Panamera Turbo S, BMW X5M, Mercedes C63 AMG Coupe PP/DP, Mini Cooper S Countryman All4

    Jul 13, 2012 1:02:55 PM

    HeavyMetalThunder
    Co-Pilot
    HeavyMetalThunder
    Loc: CH , Switzerland
    Posts: 164, Gallery
    Registered on: May 24, 2009
    Reply to: RCA

    Re: Low octane fuel!

    Cheers, thanks for clarifying kiss

     
    Edit

    Forum

    1. All 

    Boards

     
    Board Subject Last post Rating Views Replies
    Porsche Sticky SUN'S LAST RUN TO WILSON, WY - 991 C2S CAB LIFE, END OF AN ERA (Part II) 5/15/24 8:44 AM
    art.italy     		806891 1808
    Porsche Sticky Welcome to Rennteam: Cars and Coffee... (photos) 4/7/24 11:48 AM
    Boxster Coupe GTS     		449599 565
    Porsche Sticky OFFICIAL: Porsche 911 (992) GT3 RS - 2022 3/12/24 8:28 AM
    DJM48     		267079 323
    Porsche Sticky The new Macan: the first all-electric SUV from Porsche 1/30/24 9:18 AM
    RCA     		90455 45
    Porsche Sticky OFFICIAL: Taycan 2024 Facelift 3/15/24 1:23 PM
    CGX car nut     		7244 50
    Porsche The moment I've been waiting for... 2/1/24 7:01 PM
    Pilot
     
     
     
     
     
    		 887473 1364
    Porsche 992 GT3 7/23/23 7:01 PM
    Grant     		836279 3868
    Porsche GT4RS 4/21/24 11:50 AM
    mcdelaug     		401610 1454
    Porsche Welcome to the new Taycan Forum! 2/10/24 4:43 PM
    nberry     		397530 1526
    Others Tesla 2 the new thread 12/13/23 2:48 PM
    CGX car nut     		385224 2401
    Porsche Donor vehicle for Singer Vehicle Design 7/3/23 12:30 PM
    Porker     		371692 797
    Porsche Red Nipples 991.2 GT3 Touring on tour 5/12/24 6:23 PM
    blueflame     		294169 669
    Porsche Collected my 997 GTS today 10/19/23 7:06 PM
    CGX car nut
     
     
     
     
     
    		 267571 812
    Lambo Huracán EVO STO 7/30/23 6:59 PM
    mcdelaug     		244536 346
    Lotus Lotus Emira 6/25/23 2:53 PM
    Enmanuel     		238983 101
    Others Corvette C8 10/16/23 3:24 PM
    Enmanuel     		222947 488
    Others Gordon Murray - T.50 11/22/23 10:27 AM
    mcdelaug     		173503 387
    Porsche Back to basics - 996 GT3 RS 6/11/23 5:13 PM
    CGX car nut     		145295 144
    BMW M 2024 BMW M3 CS Official Now 12/29/23 9:04 AM
    RCA     		121608 303
    Motor Sp. 2023 Formula One 12/19/23 5:38 AM
    WhoopsyM     		113274 685
    Porsche 2022 992 Safari Model 3/7/24 4:22 PM
    WhoopsyM     		86136 239
    AMG Mercedes-Benz W124 500E aka Porsche typ 2758 2/23/24 10:03 PM
    blueflame     		76365 297
    Porsche 992 GT3 RS 3/3/24 7:22 PM
    WhoopsyM     		55351 314
    Motor Sp. Porsche 963 5/18/24 9:44 PM
    Wonderbar     		27193 249
    Ferrari Ferrari 296 GTB (830PS, Hybrid V6) 1/21/24 4:29 PM
    GT-Boy     		22063 103
    BMW M 2022 BMW M5 CS 4/8/24 1:43 PM
    Ferdie     		20654 140
    AMG G63 sold out 9/15/23 7:38 PM
    Nico997     		17362 120
    AMG [2022] Mercedes-AMG SL 4/23/24 1:24 PM
    RCA     		15095 225
    Porsche Porsche Mission X Hypercar 12/3/23 8:52 AM
    996FourEss     		11235 63
    Others An unassuming homologation special - 205 Rallye 5/31/23 12:23 PM
    Enmanuel     		11096 35
    120 items found, displaying 1 to 30.