is 87octane ok w/ N20 for an N/A?
03-03-04, 03:07 PM
#1
is 87octane ok w/ N20 for an N/A?
i have search on this and read the whole nitrous write-up by scathcart. but i haven't seen any info on octane levels and nitrous. so is 87octane ok or am i going to have to bump to 91? also i know timing is good stock up to a 75 shot but is that with other mods i'm putting a RB off-road header to straight pipe and i've got a ported Intake that will be going on.
03-03-04, 03:14 PM
#2
I wish I was driving!
NO. Octane requirements depend on jetting size.
Also, there is a habit of N/A owners to bump their timing advance. Don't do this. Minimalistic gains during normal use, and not worth any risk with forced induction.
Also, there is a habit of N/A owners to bump their timing advance. Don't do this. Minimalistic gains during normal use, and not worth any risk with forced induction.
03-03-04, 03:24 PM
#4
I wish I was driving!
Originally posted by theflatlander
man that was quick, thanks.
man that was quick, thanks.
Generally, increase by 40 points octane for every 50 hp increase in jetting.
Here's my rule of thumb:
<40hp: 87 Octane, stock timing.
40-50hp: 89 Octane, stock timing.
50-75hp: 91 Octane, stock timing
75-100hp: 94 octane, 2 degrees WOT retard.
150 hp: 98 octane (4:1 94 pump gas/tolulene), 4 degrees WOT retard
200 hp: 104 octane (1:1 94 pump gas/tolulene), 6 degrees WOT retard.
250 hp: 110 octane (Avgas), 9 degrees WOT retard.
120:1 Premix used in all situations.
This is for 86-91 N/A's, assuming supportive mods existed for each power level.
03-03-04, 05:23 PM
#7
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Originally posted by Lodivigo
Posting so I can find this later, great info.
Posting so I can find this later, great info.
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