chevelle
Novice Class
Posts: 52
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posted February 02, 2006 12:31 AM
.036 jet stock exh. timing ?
i am using a modded stock exh on my 03,and i am wondering with this restriction,would i need to pullout more (or less) timing then with a pipe ? with 2 degrees out,it pulls pretty hard,b/p has been 950-1080
  
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted February 03, 2006 04:57 AM
The who? What?
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Y2KZX12R
CompetitionCNC.com
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chevelle
Novice Class
Posts: 52
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posted February 08, 2006 02:01 AM
getting ready to try some bigger jets,.037 and .038,
with pump gas and 2 degrees of timing out,am i still safe ?
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speedgene
Zone Head
Posts: 996
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posted February 08, 2006 07:46 AM
What does the plug read with the setting you have now? Where are you looking when you read the plug... Just asking?
You're making two step tests. Leave one variable (cam) out. Run the engine first with just the ex. mod. Did it help? Step up one jet size and read the plug, and look for a change?
You're adding more fuel, so I'd assume more cam advance to gain more air moving sooner. Move the intake only first. This would be the approach I'd take if in your scenario.
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E-tard
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chevelle
Novice Class
Posts: 52
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posted February 08, 2006 01:50 PM
thanks for your response,but the cams have never been touched,just a moderate dry shot (.036 right now) with some fuel added to the map and 2 degrees of ignition timing pulled out
my question really has to do with the stock (pretty modded now) exhaust system,i was wondering if i would need to retard ignition timing more then a motor with a free flowing exhaust system
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zrxdean
Needs a job
Posts: 2225
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posted February 08, 2006 02:15 PM
Nope, won't matter. With a 50 shot just mix some race gas and you can leave the timing stock. On 93 pump I'd guess -2 deg would be fine, but check your plugs after a pass to be sure. -Dean
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chevelle
Novice Class
Posts: 52
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posted February 08, 2006 02:25 PM
thanks
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speedgene
Zone Head
Posts: 996
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posted February 08, 2006 02:30 PM
Well, in that case then, you simply take 1 step at a time. Move the ignition back to stock, install the 37's and do a plug chop with new plugs. If the bike drops on it's face before redline, bring the needles/jets up or down, by how the plug reads? The plug is you x-ray into the engine. This will tell you if aluminum is balling onto the porcelain, and it's super lean, or if you are too fat, where as you feed more (fuel) choke, you can determine which direction you need to go?
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E-tard
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chevelle
Novice Class
Posts: 52
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posted February 08, 2006 03:31 PM
thanks again,i appreciate all the help,i have a fair understanding (that may be a huge overstatement ) on how to tune the bike,the reason i posed the question,is n2o motors genneraly need a lot of ''exhaust'' correct ? and i am hadicapping this motor with a fairly restrictive exhaust system
btw no needles or jets,i have a 03 zx 12
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