What octane is best for 3.4" set up ?

**AmericanRiceEater** · 07-30-2010

Hey i have a full 3.4" set up and i was curious what octane gas is best to use ?

**Fivefingerdeathpunch** · 07-30-2010

highest your gas stations carry.

so 92, 93 or 94

**blueguy** · 07-30-2010

AT LEAST 91. Nothing less than that...higher the better to a point...the o2's don't like stupid high amounts of octane if they are stock ones...If you plan on running more than that get lead tolerant Denso Race o2's.

**copperpacecar** · 07-30-2010

Originally Posted by bluegtp91

AT LEAST 91. Nothing less than that...higher the better to a point...the o2's don't like stupid high amounts of octane if they are stock ones...If you plan on running more than that get lead tolerant Denso Race o2's.

i have a new 02 from autozone..is this a bad idea running 93 and meth?

**matt5112** · 07-30-2010

depends entirely on what you're tune is setup for.

Could be 91,92,93,94.

You can tune for the different octane levels very easily, but you want some safety margin.

**Reptile** · 07-30-2010

The sensors don't care what octane level you have, they don't tolerate lead additives.

IMO, a stock sensor whenever possible is always the best to use, they read consistently, and they are faster responding than aftermarket ones. Unless you plan on hitting the Leaded 110 pump at the track every weekend, you should be fine with it.

**Rust** · 07-30-2010

Holy crap!
The highest I can find is 91!
There used to be Sunoco here so I could get 94 but they all moved out.
At least the ethanol garbage is not out of hand here yet.
Stock O2's are fine unless you run race fuel alot.

**matt5112** · 07-30-2010

apparently petro's will be carrying 94 soon.

But i'm highly doubtful of this.

Time for meth.

**Rust** · 07-30-2010

At least being NA I don't need 94.

Damn I need an L67 in my Monte

**matt5112** · 07-30-2010

top swap.

my L36 in its stock form needed 94 octane and wasnt entire knock free.

Now i'm top swapped and running 91 with no knock on 14* of timing with headers and a stock pulley.

**Rust** · 07-30-2010

Nice!

**AmericanRiceEater** · 07-30-2010

all gas stations around here have at least 93

. Higher octaine decreases knock in 3.4" set ups ?

**matt5112** · 07-30-2010

higher octane allows for more timing/boost.

Doesnt matter about what setup you're running.

**Rather B Blown** · 07-31-2010

Originally Posted by matt5112

apparently petro's will be carrying 94 soon.

But i'm highly doubtful of this.

Time for meth.

A lot of the sunocos here are turning into petros, and they all still have ultra94

**matt5112** · 07-31-2010

My local sunnoco is under construction... seen the petro canada **** they wanna put up but they have yet to finish so I couldnt say for sure they'd carry 94.