Do I need 104 Octane?
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 324
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From: Fort Worth
Do I need 104 Octane? I want to run a 150(NX) wet shot. Do i need to to run 104 or a mix with 93? My timeing(NA) at WOT is at 27.5 and my o2`s are at 9.2(NA)and no KR.What do ya all suggest?
Re: Do I need 104 Octane? You should be able to get away without it. What is your current HP levels NA? Have you ever a-tapped on nitrous to see what timing your getting? Make sure to go to some NGK TR6 or equivilent plug and close the gap up to around .035 to .038 or so. And be sure your fuel system is up to par. Try running with Atap the first few times to see if there is any KR.
Thread Starter
TECH Apprentice
Joined: Nov 2001
Posts: 324
Likes: 0
From: Fort Worth
Re: Do I need 104 Octane? Thanks guys! I have a Walbro 340 intank fuel pump(wired at 13 volts) and I use NGK TR-6 plugs gapped at.038.But I have never run an A-Tap on spray.It does fine on a 100 shot and 93 octane. chime in guys!
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
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From: Chi-Town, IL
Re: Do I need 104 Octane? I plan on running just 100 all the time when I plan on spraying, I will most likely have the twin in tank walbros... <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> I am also going to up the size of the fuel jets too, and richen up the MAFT until I can get an hours worth of time on the dyno to figure out what the best settings are for it.. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
On The Tree
Joined: Nov 2001
Posts: 120
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From: Washington, D.C.
Re: Do I need 104 Octane? Fuel system is very important....UPGRADE your stock fuel system if you want to feel more confident about a 150 shot! you might get away with it for awhile with the stock fuel pump, but I would suggest upgrading to an after market pump (like a walbro) or an inline that is designed for alot of hp.. Also, I have had success with ritarding the timing. IMO that is a crucial aspect to running nitrous in our cars.
Good Luck,
Chuck
Good Luck,
Chuck
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
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From: Chi-Town, IL
Re: Do I need 104 Octane? Do you really need to retard with a wetshot, I've heard that you don't? I really don't want to pull timing, I still want to have a strong *** car on motor.. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
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TECH Enthusiast
Joined: Nov 2001
Posts: 617
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From: Milford, Ohio
Re: Do I need 104 Octane? There has been a lot of discussion of timing retard over the last month or so, you can do a search to find those threads.
Up to a moderate shot (150-175), there really is no point in doing so for a car that is primarily run N/A - definitly don't do anything to advance it however For 200+ it's probably a good idea to drop some timing for best bottle power. Al (383LQ4SS) has been messing with some reduced timing and large shots.
Up to a moderate shot (150-175), there really is no point in doing so for a car that is primarily run N/A - definitly don't do anything to advance it however For 200+ it's probably a good idea to drop some timing for best bottle power. Al (383LQ4SS) has been messing with some reduced timing and large shots.
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