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Help with 450s

Old 06-21-2005, 12:14 AM
  #1  
0.5 BAR
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Join Date: Jun 2004
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Default Help with 450s

I have a SECU gold computer and I just installed DSM 450s with a high flow rail. Calibrated on the stock B16 fuel map, the air fuel ratio hovers around 18 at idle. I have a fuel pressure gauge and it tells me right around 30 at idle (on a B16A in a CRX). I double checked the wiring, I tried to bring the air fuel ratio down but I kept having to add a lot of fuel but that shouldn't be right. (?) With the stock injectors, air fuel ratio was 14.7 at idle (perfect). I need help please. Why is this happening?
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Old 06-21-2005, 01:02 AM
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Default Re: Help with 450s

Because of the inertia of the injectors at low pulse durations. There is a large moving mass, and a straight percentage cut will run you lean from stock injectors.

...it is natural to have to increase fuel at idle about 5-7% on 450cc injectors over the percent difference (46%) from 240cc injectors.
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Old 06-21-2005, 07:29 PM
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Default Re: Help with 450s

i gave it 10 percent at idle and it was still around 16 A/F would this still be normal? also the injectors were balanced and blueprinted.
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Old 06-21-2005, 07:31 PM
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Default Re: Help with 450s

8.6% is one AFR point... I.E., if you're at 20:1, adding 8.6% will bring you down to 19:1... get what I'm saying?
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