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Re: So by your logic then
Posted by Johann F [Email] (more from Johann F) on Thu, 27 Dec 2001 09:50:11
In Reply to: So by your logic then, Jay Hassinger, Thu, 27 Dec 2001 08:47:30
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Yes! - make a big change to the flow characteristics of an engine and the preset fuel curves that are used outside (accelerating and WOT) closed loop lambda are no longer optimum - info from the AMM is only a part of the information the ECU needs to calculate fuel delivery.
In simple terms you cannot calculate fueling simply from the amount of air ( mass or otherwise) entering the engine. I'm not saying you wont see some improvement from removing the CAT but you won't get the full benefit without fueling changes. In addition fueling requirements for a car which has a catalyst are specific for the correct functioning of the CAT and its longevity - these are not the same as optimum fueling for the efficiency of the engine - power , economy and drivability. I am assuming the SPG is running an LH2.2/4 system - these are really not that sophisticated when compared to modern adaptive and 'learning' engine management systems which should respond much better to improvements in backpressure etc.
posted by 195.102.196.1...
Posts in this Thread:
- Gutting a SPG cat, BuHuSPG, Wed, 26 Dec 2001 23:37:14
- So whats the verdict, BuHuSPG, Thu, 27 Dec 2001 23:35:00
- Re: Gutting a SPG cat, SDP, Thu, 27 Dec 2001 12:36:29
- remove it with the downpipe, dave n, Thu, 27 Dec 2001 06:43:01
- Re: remove it with the downpipe, Johann F, Thu, 27 Dec 2001 08:01:00
- So by your logic then, Jay Hassinger, Thu, 27 Dec 2001 08:47:30
- Re: So by your logic then, Johann F, Thu, 27 Dec 2001 09:50:11 <-- Viewing This Message
- Re: So by your logic then, Jay Hassinger, Thu, 27 Dec 2001 10:50:50
- no theory here., dave n, Thu, 27 Dec 2001 16:10:07
- Re: So by your logic then, Johann F, Thu, 27 Dec 2001 12:50:33
- Well some final thoughts, Jay Hassinger, Fri, 28 Dec 2001 07:58:52
- Agree- and some, SDP, Thu, 27 Dec 2001 20:28:51
- Dunno which FI system you're referring to... but,, bazil burns, Thu, 27 Dec 2001 15:26:46
- Re: Gutting a SPG cat, chrisx, Thu, 27 Dec 2001 04:09:34
- yes but just a few considerations, Quinn S. Kurz, Thu, 27 Dec 2001 01:51:26
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