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Old 02-13-2008, 03:53 PM
  #7  
OneBadGMC
Senior Member
RACING JUNKIE
 
Join Date: Sep 2007
Location: Belleville, IL
Posts: 658
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I agree with you on the barrel valve, it's too lean.

But saying you ran 33 nozzles and 88 main jet means very little because without pump flow information you don't know what the system pressure is.

Too little system pressure won't atomize the fuel properly, and will as such reduce performance.

Most of the guys I know who are serious about this run extra bypass canisters (known as pump sizers) to get their main pill between 90-110.

This way you have about a 1% differential between jet sizes. Stray too far away from that range, and making a jet change is either too little of a change or too much. The orifice size is a differential from one jet to the next based on area.

Jim Hatley has a nice web based calculator that can be used to calculate system pressure (with or without forced induction). It's setup for nitro, but if you enter 0 for nitro, it assumes alky. It won't work with gas.

http://dragracemath.jimhatleyracing.com/fuelsys.html
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