Octane Requirements
Thread Starter
Joined: Jul 1999
Posts: 2,926
Likes: 5
From: Tucson, Arizona USA
Car: 1987 Z28 Convertible
Engine: 305 TPI
Transmission: 5-speed
Octane Requirements
Is static compression ratio the only factor considered in determining minimum octane requirements? Or are there other factors I'm unaware of?
The reason I'm asking is because I recently lowered my compression to 8.4 to 1 (I will be running at least 20-psig boost). When I race at the track, I'll be using at least 100+ octane fuel. But on a daily basis when I do not go into boost, what octane fuel can I theoretically get away with?
The reason I'm asking is because I recently lowered my compression to 8.4 to 1 (I will be running at least 20-psig boost). When I race at the track, I'll be using at least 100+ octane fuel. But on a daily basis when I do not go into boost, what octane fuel can I theoretically get away with?
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Depends on a lot of factors but you should be able to run on
92 octane gas on the street if you lower the boost to about 10psi,
and retard the timing a little under boost.
You'll still make plenty of street power at 10psi.
An intercooled motor can get away with more boost on the same octane and make more power.
Water/alcohol injection will get you about 14psi on the street.
recommend 110 octane for the track.
92 octane gas on the street if you lower the boost to about 10psi,
and retard the timing a little under boost.
You'll still make plenty of street power at 10psi.
An intercooled motor can get away with more boost on the same octane and make more power.
Water/alcohol injection will get you about 14psi on the street.
recommend 110 octane for the track.
Last edited by F-BIRD'88; Sep 24, 2003 at 01:36 AM.
Thread
Thread Starter
Forum
Replies
Last Post
ZZ3Astro
Power Adders
1045
Aug 13, 2019 12:57 AM
