That's only roughly 17.2 lbs/min airflow. Very low for "188 wheel horsepower" ... more like 188 *crank* horsepower. It is far more likely the dyno was poorly calibrated.

Furthermore the airflow through T7 is highly variable. I saw 7 hp on two different runs when I was on the dyno. I regularly see over 8% variation (often over 11%) in airflow in the completely stock Viggen.

Without an average of numerous dyno-runs this is not a conclusive increase in power.

Both of the following runs are on 100 octane VP Racing fuel. Both are to redline, and both were in identical conditions on the same night in the same stock car (2002 Viggen):

First run works out to roughly 245 bhp worth of airflow (22.5 lbs/min):
[IMG]http://img.photobucket.com/albums/v14/SaabTuner/Missing_HP.jpg[/IMG]

Second one works out to about 267 bhp (24.45 lbs/min, over 24 lbs/min several additional times):
[IMG]http://img.photobucket.com/albums/v14/SaabTuner/Full_MAF_Log.jpg[/IMG]

As for dyno runs, here are three consecutive ones (206,211, 213) within 15 mins of eachother. I guess magic gave me 7 more bhp without ANY mods?:
[IMG]http://img.photobucket.com/albums/v14/SaabTuner/206-211-213.jpg[/IMG]


Hey, you can think what you want. But 10 hp isn't much when a stock T7 car varies more than that from run to run even on race fuel. Perhaps you should sell the exhaust under a different focus?

Eric, remember that discussion we had about choke flow? It applies to the low-end models too. Their exhaust pressure will be less, but above 5K rpm there won't be any increase in flow due to a modified post-turbo exhaust system because the exhaust "nozzle" even on the base model is above choke flow and thus will only flow more with increased boost. Did did you notice that there was no change in boost? I can gurantee there was also no change in flow. Ignition timing must have been different between the runs, and it's somewhat unlikely that this was due to the exhaust, which the engine would not "feel" above 5K. The torque increase may be exhaust based ... but it's hard to say if T7 would eventually learn to control that "spike" and get back to normal mg/c values.

Adrian~


posted by 4.60.65...

• 3" downpipe with cat 13-18hp gains on stock 9-3, ckpaden, Tue, 7 Dec 2004 13:14:52
  • Re: 3" downpipe with cat 13-18hp gains on stock 9-3, 95power, Fri, 10 Dec 2004 06:08:36
    • Yet another source of abbreviation confusion....., MI-Roger , Sat, 11 Dec 2004 16:03:53
    • Re: 3" downpipe with cat 13-18hp gains on stock 9-3, Eric, Sat, 11 Dec 2004 08:46:46
      • Could you post the OBD sheet, Vigge, Sat, 11 Dec 2004 12:24:13
        • MAF, Eric, Mon, 13 Dec 2004 14:12:25
          • Re: MAF, Adrian W, Fri, 17 Dec 2004 01:22:32 <-- Viewing This Message
            • Re: MAF, Adrian W, Fri, 17 Dec 2004 01:29:40
          • Do you have the values for stock HW? nm, Vigge, Tue, 14 Dec 2004 12:09:39
          • One more favour, Vigge, Mon, 13 Dec 2004 20:13:50
        • Boost Compare, Eric, Mon, 13 Dec 2004 14:10:49
          • Hmmm, nice spike!, Vigge, Mon, 13 Dec 2004 20:10:04
            • Re: Hmmm, nice spike!, Eric, Tue, 14 Dec 2004 08:29:21
              • Re: Hmmm, nice spike!, Vigge, Tue, 14 Dec 2004 12:08:50
                • Re: Hmmm, nice spike!, perkj, Wed, 15 Dec 2004 14:50:38
                  • Re: Hmmm, nice spike!, Vigge, Thu, 16 Dec 2004 12:22:59
    • I agree w/you and Vigge....., zeke, Fri, 10 Dec 2004 09:42:44
  • A/F too lean?, Vigge, Thu, 9 Dec 2004 10:18:28
    • Re: A/F too lean?, ckpaden, Thu, 9 Dec 2004 13:39:52
      • Message deleted from here?????, Vigge, Sat, 11 Dec 2004 03:50:38
        • I wonder this too! n/m, 95power, Sat, 11 Dec 2004 05:44:04
        • Me too!!!..............nm, zeke, Sat, 11 Dec 2004 05:07:25
  • does it bolt, adam , Wed, 8 Dec 2004 04:36:36
    • That is the best part, it does bolt on., ckpaden, Wed, 8 Dec 2004 06:38:25
      • what about the flex pipes n/m, adam , Wed, 8 Dec 2004 09:12:43
        • Re: what about the flex pipes n/m, ckpaden, Wed, 8 Dec 2004 09:23:54
  • dyno numbers w/ a 2.0-T5, 2.0-T7, or a 2.3-T7?, perkj, Tue, 7 Dec 2004 17:06:05
    • Done with a 2000 9-3 Base T7, n/m, Eric, Tue, 7 Dec 2004 17:14:51
      • What does this equate to at the crank?, bb vign, Wed, 8 Dec 2004 09:57:27
      • woohoo!! T7s can see hp gains w/o software updates! =), perkj, Tue, 7 Dec 2004 17:37:04
        • Yes they can :-), ckpaden, Tue, 7 Dec 2004 18:05:47
          • I have a Viggen you can try it on :-), pvanosta, Thu, 9 Dec 2004 07:37:49
          • how do you think it would affect T5 cars?, dip, Wed, 8 Dec 2004 10:55:53
            • Re: how do you think it would affect T5 cars?, ckpaden, Wed, 8 Dec 2004 11:00:17
              • Re: how do you think it would affect T5 cars?, 95power, Sat, 11 Dec 2004 04:47:54
          • damn...., perkj, Tue, 7 Dec 2004 19:14:22
          • Re: Yes they can :-), GM, Tue, 7 Dec 2004 18:53:36
            • Re: Yes they can :-), perkj, Tue, 7 Dec 2004 19:18:13
              • No a/f issues, ckpaden, Tue, 7 Dec 2004 20:03:52
                • ...and to those skeptics with attention to details..., perkj, Tue, 7 Dec 2004 20:26:30
                  • Re: ...and to those skeptics with attention to details., 95power, Sat, 11 Dec 2004 04:50:03
                  • Great attention to detail!, ckpaden, Tue, 7 Dec 2004 21:29:49
  • Good job! Nice to see numbers on this variable...., zeke, Tue, 7 Dec 2004 13:27:58
    • Downpipe without cat 10-15hp gains, ckpaden, Tue, 7 Dec 2004 13:50:53
      • That must make a lot of noise in the attic.., SteveW, Tue, 7 Dec 2004 16:42:06
        • It's quite loud in the attic right now., ckpaden, Tue, 7 Dec 2004 17:00:05
          • I tuned my car at MAC..., Andy E, Tue, 7 Dec 2004 21:03:25
            • Re: I tuned my car at MAC..., ckpaden, Tue, 7 Dec 2004 21:24:29
              • Sounds good to me...., Andy E, Tue, 7 Dec 2004 23:58:18
                • Your right about that, ckpaden, Wed, 8 Dec 2004 06:35:09
                  • Re: Your right about that, tpierceh, Wed, 8 Dec 2004 09:09:13
                    • Re: Your right about that, ckpaden, Wed, 8 Dec 2004 09:31:37
      • That looks like a nice downpipe......, zeke, Tue, 7 Dec 2004 14:19:53
        • Re: That looks like a nice downpipe......, ckpaden, Tue, 7 Dec 2004 14:27:05
          • Re: That looks like a nice downpipe......, steveC, Tue, 7 Dec 2004 20:16:37
            • Re: That looks like a nice downpipe......, ckpaden, Wed, 8 Dec 2004 09:57:40
              • Re: That looks like a nice downpipe......, steveC, Wed, 8 Dec 2004 10:23:48
          • Well, I've never done a before & after, like you......, zeke, Tue, 7 Dec 2004 17:05:46

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