In Reply to: wideband on stock viggen, jak [Profile/Gallery] , Tue, 18 Oct 2005 11:23:19

Hey Jak,

first let me say i'm impressed with your work as a tuner and respect your opinion very much.
(i've been reading TSN silently for years, cause with a bit searching i've found most answers)

Your posting has brought me to the question about proper AFR's at boost.
Recently i've read an article at innovatemotorsports about the topic of being "too rich" http://www.innovatemotorsports.com/resources/rich.php

One quote from the text:
"Richening up the mixture results in a slower burn, moving the pressure peak later where there is more leverage, hence more torque. Also the pressure peak is lower at a later crank angle and the knock probability is reduced. The same effect can be achieved with an optimum power mixture and more ignition retard."

So this says, you make better power at 12.5:1 AFR and more ignition retard than running rich at say 11.0:1 AFR with a bit more ign. advance.
It's almost all about the right PPP (peak pressure point) if i understand the article correctly.

So, what do you think about this? I would love to hear your opinion on this.

Best regards from Germany
Stephan
900 T16 '89
PS: sorry for the long text

posted by 84.139.9...

• wideband on stock viggen, jak , Tue, 18 Oct 2005 11:23:19
  • Re: wideband on stock viggen, Vigge, Tue, 18 Oct 2005 21:06:51
    • hey vigge, jak , Tue, 18 Oct 2005 21:49:07
      • Re: hey vigge, vigge, Wed, 19 Oct 2005 06:58:37
        • I thought that too, jak , Wed, 19 Oct 2005 07:02:31
          • If you have a scantool, Vigge, Thu, 20 Oct 2005 01:39:09
            • Re: If you have a scantool, jak , Fri, 21 Oct 2005 05:56:10
              • Tach signal, Vigge, Sat, 22 Oct 2005 04:17:43
                • tha datalogger, jak , Sat, 22 Oct 2005 05:42:03
          • Re: I thought that too, vigge, Wed, 19 Oct 2005 07:13:40
            • I know I can record but getting it to a PC :-( ........, jak , Wed, 19 Oct 2005 12:51:42
  • I got a question regarding AFR at boost, StephanK, Tue, 18 Oct 2005 20:30:11 <-- Viewing This Message
    • I did read that article :-), jak , Tue, 18 Oct 2005 21:46:08
      • Re: I did read that article :-), GM, Wed, 19 Oct 2005 05:44:56
        • for safety or power?, JJJ, Wed, 19 Oct 2005 13:36:45
          • Re: for safety or power?, GM, Wed, 19 Oct 2005 17:37:09
  • Re: wideband on stock viggen, AT, Tue, 18 Oct 2005 12:09:03
    • Re: wideband on stock viggen, lms, Tue, 18 Oct 2005 12:45:05
      • it is a 2002 viggen, jak , Tue, 18 Oct 2005 13:01:44
        • Re: it is a 2002 viggen, Drew in Houston, Tue, 18 Oct 2005 18:10:25
          • Drew's observations are correct, except..., Dave in Houston, Wed, 19 Oct 2005 19:30:05
        • Re: it is a 2002 viggen, KevinY, Tue, 18 Oct 2005 18:01:54
          • hey kevin, jak , Tue, 18 Oct 2005 19:16:33

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