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Old 07-02-2015, 01:07 AM   #41
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I would agree, especially if it proves to work as good, or better, than the OEM damper.
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Old 07-02-2015, 11:04 AM   #42
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Originally Posted by codrus View Post
dampers need to be tuned to a specific fuel pressure.
I'd say they operate properly within a spec'd operating range, not "tuned". My guess is some kind of expansion chamber bottoms out above that range.
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Old 07-04-2015, 12:44 AM   #43
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I'm still new to the whole Miata world, But FWIW over in the Evo X world we were facing some fuel pressure abnormalities a little while ago with after market fuel rails and AFPR's, which was exacerbated with larger injectors. around 2000-2200 RPMS, we would dangerously lean out with no real explanation despite having pleanty of pump to support high HP numbers (some guys were running twin 450 pumps and still having the issue). Turns out our OEM FPR's had dampers in them internally and when switching to AFPR's we were unintentionally removing them causing a weird resonance in the fuel rail that couldn't be tuned around. Some guys experimented with the Radium FPD and found it solved all tuning issues related to that 2000-2200 lean spot. The X platform is obviously highly different, as is the fuel system in that it uses a more tradition performance oriented Pump->Rail->FPR->Return setup, but we did have great success with the Radium FPD. We also found a solution to running big pumps at idle/no boost cruising but would still provide full power to the pumps when getting into boost, basically for the same reasons as stated earlier, over whelming the FPR for those running very large pumps (wally 450's in single and twin configurations, twin 320's, etc). It might be worth the little extra expense to swap your regulator to the return side and do the required plumbing, it might make tuning easier as well.
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