Think it's the RRFPR doing it's thing. Oh also and ignore the 'max air/fuel = 17.5", that's an anomaly. The more I think about it, the more the curve makes sense, though it's obviously far from ideal.

When you nail the throttle, full boost comes on oh, around 3k rpm or so, and full boost means full fuel pressure, about 65ish psi with my RRFPR. But, at 3000 rpm you don't need that much fuel. At 6000 RPM, looks like the engine could actually use a little bit more fuel than that. And everywhere in between we see that as the rpm go up, the engine is 'eating', to use the words of the guy running the dyno, more and more fuel.

The dyno is really a great tool to see what's going on! I don't really see a way around this type of curve, without modifications to the RRFPR internals. I may be able to ugprade my water injection system though to allow the water injection input to be mapped to the fuel flow/rpm. What's needed is to flatten out the A/F curve, so that means much less fuel at lower rpm, and a little more at high.. Hard to do with the LH system..


Aaron

posted by 207.202.177.156

• SCS Dyno Day results! (mine anyhow) :), Aaron Gilbert, Sat, 4 Aug 2001 21:04:04
  • air/fuel ratio??, dave n, Sun, 5 Aug 2001 10:14:04
    • It's the bottom line, funky I know...ChrisX and Kooch similar.., Aaron Gilbert, Sun, 5 Aug 2001 10:32:14 <-- Viewing This Message
      • wide band 02 sensor?, Kevin K , Sun, 5 Aug 2001 14:51:52
        • Map sensor Variable frequency output?, Lee, Mon, 6 Aug 2001 14:16:57
          • Autospeed Article Link, Lee, Mon, 6 Aug 2001 15:17:05
        • Yes, this was the shop's wideband O2 sensor.., Aaron Gilbert, Sun, 5 Aug 2001 22:19:20
          • 10:1 is too rich,, Kevin K , Sun, 5 Aug 2001 23:28:53
            • God I hat this enter button/try this (sorry), Gregg C, Mon, 6 Aug 2001 00:21:55
              • LH system, Kevin K , Mon, 6 Aug 2001 00:37:19
                • Re: LH system, chrisx, Mon, 6 Aug 2001 23:56:41
            • It is all a waste of money...., Gregg C, Mon, 6 Aug 2001 00:09:35
        • not ignored, it's expensive, dave n, Sun, 5 Aug 2001 19:54:51
          • $270 (link) , Brad of KC ..., Kevin K , Sun, 5 Aug 2001 23:24:02
      • oh, maybe you're on to something., dave n, Sun, 5 Aug 2001 10:45:02
  • Re: SCS Dyno Day results! (mine anyhow) :), chrisx, Sat, 4 Aug 2001 22:45:33
    • fuel ..., Kevin K , Sun, 5 Aug 2001 23:44:17
      • Re: fuel ..., chrisx, Mon, 6 Aug 2001 23:47:52
        • Re: fuel ..., Kevin K , Tue, 7 Aug 2001 09:15:48
          • Re: fuel ..., chrisx, Tue, 7 Aug 2001 11:58:49
    • AND a raucous 8v n/a coming in at 115. nice run. n/m, chrisx, Sun, 5 Aug 2001 01:57:38
  • how much boost? thanks for posting some results...nm:-), steveC inBC, Sat, 4 Aug 2001 21:32:27
    • SteveC in BC. Come down and join us next time! N/M, Gregg C., Sun, 5 Aug 2001 03:52:14
      • I would like that!, steveC, Sun, 5 Aug 2001 15:16:30
        • cool. it's a date. octoberish? warm enuff for bbq. b there. n/m, chrisx, Sun, 5 Aug 2001 20:10:23
    • Re: how much boost? thanks for posting some results...nm:-), Gregg C, Sun, 5 Aug 2001 03:50:56
    • Not sure, somewhere between 15-20 psi. :), Aaron Gilbert, Sat, 4 Aug 2001 21:59:42

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