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Discussion Starter #1
This motor is a sbf (306) with a holley systemax EFI with 75 mm TB. I have a systemax nitrous plate for this motor and I need to make the field of 10.90 index race. My nitrous system is set up for low pressure (stand alone fuel for nitrous).I need about 125HP to make it run about 10.90 I have the chart for the holley systemax for the SBF, BUT it is for for 40 psi fuel pressure. 43/31 for 100HP @ 40-45 flowing pressure52/33 for 125HP @ 40-45 flowing pressure59/37 for 150HP @ 40-45 flowing pressureCan you guys recommend me approximately jet sizes for about 7 psi flowing pressure?I have a one day race with 2 qualifying and I need to get a baseline to get to run 10.90 index (10.90-11.20). I dont have time to do any test runs.I am sure with 125 HP it will get me in the ballpark of 10.90 , but I need a jet combination @ +/- 7psi to start with. It is just one race with 2 qualifying sessions.Any help is greatly appreciated.
 

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if its an nx plate I believe they have all the low psi tuneups aswell give them a call
 

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Discussion Starter #3
Hi Tyler,
its the intake I bought from you last year. The plate is a holley. Thats a good idea to call them up. Thanks
 
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