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E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #311 of 327 Old 4th November 2017, 11:59 AM
Sailor24
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Quote:
Originally Posted by mgdmb View Post
I'm sure I've mentioned this at least once to someone before, but just code the AA out and call it a day...
I know we see things different but that is because of the climates we live in. In Calli it might be fine to code it out but up here in the great, not so cold as it was you are 10X better to do the by pass and have the engine heat up quicker. I was 9 min to temp before I by passed my SAP now I am 7 min. It is only 2 min but out of 7 min that is huge since 90% of the engine wear happens between start and warm. Conceivably that is 20% less wear. Where the car warms up in 7 min even if the SAP is not functioning then the SAP is moot, but in colder climates I think it is a big bonus but hard to know we have tons of 250K KM cars running up here the ones that fail all seem to have the SAP code.

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post #312 of 327 Old 4th November 2017, 01:13 PM
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Quote:
Originally Posted by Sailor24 View Post
I know we see things different but that is because of the climates we live in. In Calli it might be fine to code it out but up here in the great, not so cold as it was you are 10X better to do the by pass and have the engine heat up quicker. I was 9 min to temp before I by passed my SAP now I am 7 min. It is only 2 min but out of 7 min that is huge since 90% of the engine wear happens between start and warm. Conceivably that is 20% less wear. Where the car warms up in 7 min even if the SAP is not functioning then the SAP is moot, but in colder climates I think it is a big bonus but hard to know we have tons of 250K KM cars running up here the ones that fail all seem to have the SAP code.
How does the bypass warm the engine up faster since you're bypassing the engine? Also this is false reasoning since an intact system steals heat from the heads to direct to the cats - that is the whole purpose of this engineering chicanery which is to get warmer air to the cats on start up to help start up emissions only. Am I missing something?

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post #313 of 327 Old 4th November 2017, 03:26 PM
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Now for reference some guys will want to see Sailors bypass method and ensuing discussion. In this thread, starting here:
https://www.m5board.com/vbulletin/e39...ml#post5885002

2001 ///M5 ...Anthracite / Black Complete-Heritage
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post #314 of 327 Old 5th November 2017, 03:08 AM
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The air to the cats makes the cats react which creates heat. It has nothing to do with the air going thru the heads except you maybe right and that might cool it but likely the warmer air will react better in the cats returning heat to the engine faster. Once the cats are warm then that heat backs up to the engine instead of sucking heat from the heads and engine. You seem to have it backwards. Besides there is no arguing with the time difference on warmup and those tests were in the fall not even the winter.
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post #315 of 327 Old 5th November 2017, 12:23 PM
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Quote:
Originally Posted by Sailor24 View Post
The air to the cats makes the cats react which creates heat. It has nothing to do with the air going thru the heads except you maybe right and that might cool it but likely the warmer air will react better in the cats returning heat to the engine faster. Once the cats are warm then that heat backs up to the engine instead of sucking heat from the heads and engine. You seem to have it backwards. Besides there is no arguing with the time difference on warmup and those tests were in the fall not even the winter.
The only energy source in the cats is the chemical reaction aided by platinum to burn off unburnt hydrocarbons. Any exothermic reaction is not going to heat the exhaust and back up to the engine and heat the engine when the engine is the primary heat source many factors of ten greater. It's like saying the sun heats the planet Mercury and that Mercury somehow feeds back on the sun making the sun hotter. Again if you cool the heads by the air pump turning on you are cooling the engine and have a vector into the exhaust to draw heat from the engine in addition to the exhaust manifold. With the bypass the heads are clogged but the air pump is cooling the exhaust (now more than stock) allowing the manifold to stay slightly cooler longer. The only way I can explain your engine heating up faster is somehow the O2 sensors are now reading differently and changing engine parameters - or, your measurements were erroneous.

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post #316 of 327 Old 5th November 2017, 03:04 PM
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Wouldn't adding water injection clean that mess up?

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post #317 of 327 Old 5th November 2017, 06:47 PM
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Air pump stays on for only two minutes. The extra air going to the cats reacts with the very rich exhaust from start up. That makes heat. Since metal conducts heat it will travel, but none the less the heat from the engine is not robbed to heat the cats.
Your analogy is not even close to the same. The engine and cats are one and if heat is created in the cat it is the same as it being created in the engine.
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post #318 of 327 Old 6th November 2017, 03:14 AM
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Easy answer: Block off your secondary air ports. They do nothing good from a performance point of view.

--Peter
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post #319 of 327 Old 6th November 2017, 04:14 AM
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Originally Posted by herrubermensch View Post
Easy answer: Block off your secondary air ports. They do nothing good from a performance point of view.

--Peter
What is the cleanest method to plug the ports? I know you can remove the air valve off the injection rail and block off with a OE blank plate from an N52 or similar but does anyone make actual blanks for the heads?
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post #320 of 327 Old 6th November 2017, 04:38 AM
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Originally Posted by tmaxx445 View Post
What is the cleanest method to plug the ports? I know you can remove the air valve off the injection rail and block off with a OE blank plate from an N52 or similar but does anyone make actual blanks for the heads?
Yes! We do. $100/pair. Install with red loctite and appropriate sized socket.

--Peter
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