Any issue on switching to 91 octane gas? - Page 3 - 6SpeedOnline

Aug 28, 2010 | 03:59 PM

#31

DNugget991GT3

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Joined: Oct 2005

Posts: 5,597

Rep Power: 332

running on 91 octane will do absolutely nothing harmful to our engines.
this is a fact.

Aug 28, 2010 | 04:37 PM

#32

Prche951

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Joined: Apr 2008

Posts: 5,214

From: Colorado

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you are probably right. I'd bet 91 is very close to what the stock tune was designed for. But I would not go lower. I did not see anywhere, where 93 is recommended.

Aug 28, 2010 | 06:09 PM

#33

ard

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Joined: Jan 2007

Posts: 2,981

From: N. California

Rep Power: 298

Quote:

Originally Posted by robertp

My car has a custom tune for VP MS 109. I can not run a lower octane gas with this race gas file. As it has been stated above, never run 91 with a race gas tune. You must have a race file to get the performance out of a higher octane gas.

Yes Robert, but you are tethered to your home....(or trailer or spare gas can or....)

Quote:

Originally Posted by STEVE KOJASEVIC

running on 91 octane will do absolutely nothing harmful to our engines.
this is a fact.

Only with a stock tune..anything else you must talk to the person that coded the program.

Aug 28, 2010 | 07:03 PM

#34

DNugget991GT3

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Posts: 5,597

Rep Power: 332

i have UMW tune on my car. tuned for 93 octane. car holds 1.3 bar to 6000 rpm and drops off to about 0.9-1.0 until 7200 rpm.

car gets abused like a 20 year old toyota corolla, and the engine has been totally fine.

Aug 29, 2010 | 07:59 AM

#35

robertp

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From: California

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[quote=ard;2959278]Yes Robert, but you are tethered to your home....(or trailer or spare gas can or....)Yes, a full tank of 109 will take me over 200 miles. I so cal I can visit a lot of places with that range. If I need to travel a greater distance, i will take one of my other 3 cars.

Aug 29, 2010 | 01:27 PM

#36

TTdude

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Joined: Oct 2008

Posts: 2,321

From: Fastlane USA

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Quote:

Originally Posted by Prche951

you are probably right. I'd bet 91 is very close to what the stock tune was designed for. But I would not go lower. I did not see anywhere, where 93 is recommended.

996T
“””””
"The engine has been designed to provide optimum
performance and fuel consumption with unleaded
fuel with 98 RON/88 MON. If unleaded fuel with an
octane rating of at least 95 RON/85 MON is used,
the ignition point and the boost pressure are
adapted (reduced)."