01-03-2014, 09:04 AM
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#1
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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The DME in these cars is perfectly capable of adjusting ignition timing to successfully cope with fuels ranging from 83 to over 93 octane; there should not be any issues other than a slight loss of total power output.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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01-04-2014, 07:56 AM
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#2
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Registered User
Join Date: Nov 2013
Location: Emerald City
Posts: 885
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I'm in nwi and I've yet to find a station that doesn't have 93...all of the speedways do...recommend you come across the state line and hit the speedway on calumet in munster or somewhere close. They all have 93. I've used 92 in a pinch but don't make a habit of using less than 93...I figure if I wanted to save money on gas I wouldve kept my nissan sentra. Instead I bought a porsche so I do what porsche says it needs.
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01-04-2014, 08:09 AM
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#3
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Registered User
Join Date: Sep 2013
Location: Chandler, AZ
Posts: 1,796
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With we had 93 or even 92. All we have is crappy 91.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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01-04-2014, 08:33 AM
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#4
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Registered User
Join Date: Aug 2009
Posts: 1,466
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You could get away with the 89. I don't believe it's recmended and I would be concerned with 10% ethanol and 89 octane. In the end you should probably add a fuel injector cleaner. As soon as you do you may as well have bought the more expensive 93 octane.
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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01-04-2014, 03:49 PM
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#5
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Registered User
Join Date: Apr 2009
Location: Orlando
Posts: 1,266
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Torco Accelerator - It's not just an octane booster - Torco Race Fuels
torcoracefuel.net/pro-accelerator.html
Torco Accelerator is not just another octane booster or fuel additive, it's a race fuel concentrate.
They have mixing charts for different octanes. 
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Old Hippie Young Heart
2000 S/3.2 Liter/Tiptronic/Boxster S Sport Package/Cruise Control/Slate Grey Metallic
Red Special Leather Interior/Red Floor Mats/Red Hand Painted Instrument Dials/Roll Bar/Windstop
Small Carbon Package/Leather Wrap Carbon Wheel/Center Console Exterior Color/Alum Carbon Shift Knob
AM/FM Radio w/CD Player & Changer/Digital Sound Package/18" Turbo Wheels/Wheel Caps w/Colored Crest
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01-04-2014, 06:24 PM
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#6
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Porsche "Purist"
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
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From an article in USA Today:
All Porsche engines are designed for premium, too, but it's not available everywhere. "Our cars must be able to drive all over the world, and so we are able to run on regular," says Jakob Neusser, director of powertrain development at Porsche's research and development center in Weissach, Germany. "You don't have to feel that a mechanical problem or anything else will happen" using regular gas, even in the highest-performance, regular-production Porsches.
__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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01-04-2014, 06:34 PM
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#7
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Porsche "Purist"
Join Date: Aug 2003
Location: Wisconsin
Posts: 2,123
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__________________
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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01-10-2014, 05:41 AM
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#8
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Registered User
Join Date: Jun 2012
Location: Peoria IL
Posts: 529
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Quote:
Originally Posted by jdraupp
I'm in nwi and I've yet to find a station that doesn't have 93...all of the speedways do...recommend you come across the state line and hit the speedway on calumet in munster or somewhere close. They all have 93. I've used 92 in a pinch but don't make a habit of using less than 93...I figure if I wanted to save money on gas I wouldve kept my nissan sentra. Instead I bought a porsche so I do what porsche says it needs.
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Finally put fuel in today. I guess they are 93 around here. If it was summer, I would have remembered that. I guess all the travelling through MO and OK made me misremember.
I live by the airport in Lansing so the BP on Ridge and Calumet is my spot. I just like BP for no reason at all. Unfortunately, they seem to have run out of premium or broke something. Anyway, Hopefully I have my winter car fixed tomorrow so I can clean and park the Boxster and maybe I'll see ya on the roads this summer.
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01-10-2014, 07:41 AM
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#9
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by CoBeerToad
Finally put fuel in today. I guess they are 93 around here. If it was summer, I would have remembered that. I guess all the travelling through MO and OK made me misremember.
I live by the airport in Lansing so the BP on Ridge and Calumet is my spot. I just like BP for no reason at all. Unfortunately, they seem to have run out of premium or broke something. Anyway, Hopefully I have my winter car fixed tomorrow so I can clean and park the Boxster and maybe I'll see ya on the roads this summer.
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Maybe because BP diluted Mobil 1 oil & our Gulf of Mexico. 
__________________
OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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01-04-2014, 07:27 PM
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#10
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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Quote:
Originally Posted by JFP in PA
The DME in these cars is perfectly capable of adjusting ignition timing to successfully cope with fuels ranging from 83 to over 93 octane; there should not be any issues other than a slight loss of total power output.
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As long as all your injectors are firing and the knock sensors aren't wigged out.
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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01-04-2014, 07:46 PM
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#11
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Registered User
Join Date: Jun 2012
Location: Milwaukee, WI
Posts: 383
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My experience is that Octane number for premium grade gasoline depends on whether it is a 10% ethanol blend or not. Usually the non-ethanol premium is 91 or 92 and the ethanol blend is 93. The ethanol blend requires a higher octane rating because the ethanol makes it a less efficient fuel.
When I was in South Dakota last June, there were several stations that had their mid-grade 89 octane gas priced 10c/gal higher than premium 93 octane b/c the mid-grade did not have ethanol while the premium did.
DBear
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01-09-2014, 04:48 PM
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#12
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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knock sensor location
Quote:
Originally Posted by Jake Raby
As long as all your injectors are firing and the knock sensors aren't wigged out.
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Where do I look to see if the knock sensors have "wiggled" out?
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