raising your boost some more, trying to achieve your targeted boost level of 21 psi is going to make you drastically alter your timing and fuel curves to avoid detonation. Ultimately keeping your engine from making maximum power. If you were running water right now, you would not have to be keeping your A/F as low as it is now and would make more power.

I would suggest that you add water now to save your self extra tuning hours re-doing your fuel maps which will need to be altered if you ever add water.

In Jim's case with DI-APC, adding water would be very appropriate. His DI system for ignition control is more sophisticated then most if not all aftermarket systems, being that it is microprocessor controlled and actively seeks the optimum ignition timing. So I would argue that his lack of power production can't be related to that system. Who knows what SPG9 did for his fuel chip but if they appropriately changed the maps for a conservative A/F ratio, that would leave us with fuel grade as being the real culprit here. Low 90's octane gasoline cannot handle boost levels that are much above stock. Hence, water injection which allows for maximum iginition advance and higher A/F ratios, all of which add up to achieving an engines real potential.

By the way, did you ever get any charts of your dyno runs? It would be interesting to see what your HP & Torque curves looked like especially with the additional 1000 RPM you went up to.

Steve

posted by 216.174.242...

• can't sustain high boost with performance chip, jim, Wed, 24 Jul 2002 13:59:47
  • Re: can't sustain high boost with performance chip, jim, Thu, 25 Jul 2002 09:23:14
    • Just meant BCP "7" R....., SteveW, Thu, 25 Jul 2002 09:59:52
  • Had same problems......., SteveW, Wed, 24 Jul 2002 23:43:51
  • Re: can't sustain high boost with performance chip, Vince, Wed, 24 Jul 2002 23:34:40
  • Your making to hard, Brad, Wed, 24 Jul 2002 17:18:11
    • just like painting over rust..., kooch, Wed, 24 Jul 2002 18:03:04
      • Expanding on that analogy..., Eric van Spelde, Fri, 26 Jul 2002 05:18:43
      • You will only achieve your maximum potential, SteveY, Wed, 24 Jul 2002 18:49:51
        • actually, only by using an aftermkt ecu..., kooch, Wed, 24 Jul 2002 19:20:17
          • You will see soon enough that when you start, SteveY, Thu, 25 Jul 2002 10:33:43 <-- Viewing This Message
            • Re: You will see soon enough that when you start, kooch, Thu, 25 Jul 2002 11:23:30
              • Re: You will see soon enough that when you start, Ubipa, Thu, 25 Jul 2002 13:36:39
              • You are missing the point!!, SteveY, Thu, 25 Jul 2002 13:22:46
                • not really...., kooch, Thu, 25 Jul 2002 14:06:30
              • Think you're missing the point here.., Aaron Gilbert, Thu, 25 Jul 2002 12:54:07
                • not missing it...., kooch, Thu, 25 Jul 2002 13:09:50
                  • Question, Brad, Thu, 25 Jul 2002 13:42:57
                    • agree..., kooch, Thu, 25 Jul 2002 13:47:04
                      • I take no offense, Brad, Thu, 25 Jul 2002 14:33:10
                        • and that's what i'm talking about..., kooch, Thu, 25 Jul 2002 14:53:44
                          • Re: and that's what i'm talking about..., GM, Thu, 25 Jul 2002 16:29:44
                            • Re: and that's what i'm talking about..., kooch, Thu, 25 Jul 2002 19:52:25
                              • So, Brad, Thu, 25 Jul 2002 21:34:03
                                • Re: So, GM, Thu, 25 Jul 2002 21:47:32
                                  • Re: So, kooch, Fri, 26 Jul 2002 01:48:40
                                    • Re: So, GM, Fri, 26 Jul 2002 09:32:42
                                      • check ur email...n/m, kooch, Fri, 26 Jul 2002 17:15:35
                                  • My cars, Brad, Thu, 25 Jul 2002 22:41:20
                        • Now that's some numbers there! 251 to 291! n/m, Taylor, Thu, 25 Jul 2002 14:40:42
              • Re: You will see soon enough that when you start, Vince T, Thu, 25 Jul 2002 11:43:48
                • Hmmm..., SteveY, Thu, 25 Jul 2002 13:28:26
                  • Re: Hmmm..., Vince T, Thu, 25 Jul 2002 13:48:53
  • the oscillating boost is what's key...., kooch, Wed, 24 Jul 2002 15:55:15
  • spg9 finaly has fuel chips???, Robert, Wed, 24 Jul 2002 15:46:37
  • The cycle of upgrading..., Jeff Cunningham, Wed, 24 Jul 2002 14:52:03
  • Re: can't sustain high boost with performance chip, Stephen, Wed, 24 Jul 2002 14:43:14

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