Re: MAF - Saab Performance Bulletin Board - Saabnet.com
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Re: MAF
Posted by Adrian W [Email] (more from Adrian W) on Fri, 17 Dec 2004 01:29:40
In Reply to: Re: MAF, Adrian W, Fri, 17 Dec 2004 01:22:32
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Also, in the previous message, when I said "no increase in boost", I was referring to the top-end.
Also, even though the lower models run less exhaust mass-flow, the speed of the exhaust is exactly the same; it is simply at a lower absolute pressure.
As the speed of the exhaust approaches the local speed of sound at around 5K RPM or so there won't be any flow increase due to the exhaust. If there were more boost I could understand the increase in mass-flow, and thus horsepower, from it. But without more boost, it's quite certain that the VE did not change above 5K, and since the boost did not either, the timing must have changed.
Now, above 5K, since there's no increase in VE, the cyllinder conditions will be the same with or without the exhaust. So why a change in spark timing?
I think the two runs are not a very good representation of how that particular car runs. I would suggest, for any future tests, multiple runs before and after. A comparison of the averages should be much more insightfull.
Adrian~
posted by 4.60.65...
Posts in this Thread:
- 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
- Re: MAF, Adrian W, Fri, 17 Dec 2004 01:29:40 <-- Viewing This Message
- 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
- 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
- does it bolt, adam
, Wed, 8 Dec 2004 04:36:36 - 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
- damn...., perkj, Tue, 7 Dec 2004 19:14:22
- Re: Yes they can :-), GM, Tue, 7 Dec 2004 18:53:36
- Good job! Nice to see numbers on this variable...., zeke, Tue, 7 Dec 2004 13:27:58
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