Stinger Posted May 5, 2005 Report Share Posted May 5, 2005 I picked up an adjustable timing plate and I need to know what I can probably get away with a still run pump gas. I've Milled the stock head to 21cc which gets me 150psi compression. Premium fuel here is 91 octane. I'm at 1600ft elevation. I'm wanting to try +4 but I don't know if I can get away with that much advance. I'm afraid I won't be able to "hear" detonation if it's too much and I'll have a meltdown. I can here detonation in my Turbo Mustang but it's not screaming loud like the Shee.. Is +4 too much? Quote Link to comment Share on other sites More sharing options...
wayfst Posted May 5, 2005 Report Share Posted May 5, 2005 +4 or +5 you should be ok. higher than that you'll need race fuel. watch your plugs, if they turn yellow turn it back down. Quote Link to comment Share on other sites More sharing options...
Wallrat Posted May 5, 2005 Report Share Posted May 5, 2005 Uh I'm not so sure on that one. I'd try +2 if it were my bike since its f'n hard to hear detonation on a shee. Quote Link to comment Share on other sites More sharing options...
FIRST BANSHEE Posted May 5, 2005 Report Share Posted May 5, 2005 I'm running +5, 155 psi on 92, no problems so far. Quote Link to comment Share on other sites More sharing options...
bigboybanshee Posted May 5, 2005 Report Share Posted May 5, 2005 I was running +4 timing, 155psi, @ sea level on 93 octane...no problems at all Quote Link to comment Share on other sites More sharing options...
bogart Posted May 5, 2005 Report Share Posted May 5, 2005 why not just get 93 oct. Quote Link to comment Share on other sites More sharing options...
JArmShee Posted May 5, 2005 Report Share Posted May 5, 2005 In some places 91 is the highest rated octane. I know here on LI NY 93 is premium. Quote Link to comment Share on other sites More sharing options...
Stinger Posted May 5, 2005 Author Report Share Posted May 5, 2005 why not just get 93 oct. 365015[/snapback] It's not available here...87 is regular, 89-90 is midgrade, 91 is premium. Quote Link to comment Share on other sites More sharing options...
Ducman Posted May 5, 2005 Report Share Posted May 5, 2005 I think 150 psi and +4 will be fine at 1500+ elev on 91 oct. Make sure you aren't lean on your jetting. Quote Link to comment Share on other sites More sharing options...
gurny Posted May 6, 2005 Report Share Posted May 6, 2005 I run 170psi 93 oct with a +4. I m fine just don tforget to check jetting just incase. Quote Link to comment Share on other sites More sharing options...
cbn70 Posted May 6, 2005 Report Share Posted May 6, 2005 once you advance you timing, do you need to rejet?? Quote Link to comment Share on other sites More sharing options...
05bansh Posted May 6, 2005 Report Share Posted May 6, 2005 once you advance you timing, do you need to rejet?? 365410[/snapback] Not if your jetting is dialed in. Just double check it to be safe. You only need to re jet when you are running more air through the engine like, pipes, reeds, filters.... Quote Link to comment Share on other sites More sharing options...
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