octain adj switch / nitrous

[NovaSS]

My understanding is the octain adj switch is normaly open, when closed it goes to ground and send the signle to the computer.... simple.

But what does it realy do? Does it take out a few degrees of timing at all RPMs? Now many degrees?

I was thinking ( on no !) that if you wired it through a realy as part of a N20 injection system you could get a few degrees of retardation when the N20 is used. We are talking above 75 hits ( 100-125 HP range with a direct port fogger system and its own stand alone fuel supply) .

Along with a micro switch attached to the secondary butterflys it would be a simple electrical system the reatrds igintion and prevets engagement below 4000 RPM.

 

[gmorrell]

The octane adjust pin is normally shorted to ground by the jumper plug in the connector. When the short is removed, it pulls (retards) the timing globally by 3º.

Globally means just that; everywhere - all the tables, all environmental conditions, etc.

 

[93rev2sev]

Sounds like a simple solution...Is 3° enough? Does the computer need to be reset when that state changes?

 

[NovaSS]

The octane adjust pin is normally shorted to ground by the jumper plug in the connector. When the short is removed, it pulls (retards) the timing globally by 3º.

Globally means just that; everywhere - all the tables, all environmental conditions, etc.

while 4 would be perfect for a 100-125 shot 3 is not bad !

 

[AREA 91]

Now I'll blow your mind. I'm jetted at a 100 SHOt with my dry zex kit. I'm running stock timing!!!!!!

 

[NovaSS]

My mind was blown years ago

So I shouldnt have any problem when I step up to 125 with the simple retard and 100 HP on normal timing.

 

[AREA 91]

My mind was blown years ago

So I shouldnt have any problem when I step up to 125 with the simple retard and 100 HP on normal timing.

1 step colder plugs with a smaller gap
I alway's run some "sweetener" when I am going to spray.

 

[Sho Amo]

octane boost?

 

[AREA 91]

octane boost?

Yes sir.

 

[SHOZ123]

4 degrees in the ATX PCM.