E39 M5 Secondary Air System Failure Destroying Cat Converter? - Page 3 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #21 of 30 Old 24th October 2018, 11:47 PM
gsfent
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Quote:
Originally Posted by fernandocrew View Post
Thank you for directing me to get a code reader. Is this something I get through BMW or elsewhere? Can you direct me where to get said item? I really appreciate the response.
If the pricing is competitive, consider using some of the advertiser's who support the site.

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post #22 of 30 Old 25th October 2018, 06:06 PM
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Why a peake reader? A much better alternative is inpa which is actually usefull for other stuff than reading codes.
Inpa is very easy to buy and get running on any laptop. And can do live data too

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Last edited by autonaut; 25th October 2018 at 06:07 PM.
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post #23 of 30 Old 26th October 2018, 01:25 AM
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How true but... since the poster did not know he needed a code reader, don't you think that INPA might be a very large first step? I was just going to tell him to get a generic OBDII reader but I left my fire suit at the cleaners.
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post #24 of 30 Old 30th October 2018, 03:19 PM
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As it turned out I did get the OBDII and will start out by using this to help identify problems. I surely appreciate all the responses that came to my questions. That's the spirit of the forum! The reality is this marvelous car whose speed and power we enjoy so much is also a complicated piece of engineering and can be expensive even when we do know what we are doing so avoiding any unnecessary expenses through the sharing of knowledge and experience is a prime good. Thank you fellows for everything.
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post #25 of 30 Old 2nd November 2018, 06:37 AM
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Quote:
Originally Posted by gmettus View Post
Since you state you live in a part of Wisconsin that doesn't require emissions testing, do yourself a huge favor; take this opportunity to get rid of the cats, mufflers and MAFS. This advice is contingent on the availability of a shop that can do this kind of work for you. If you live reasonably close to Naperville, Illinois I can strongly recommend one, https://www.youtube.com/watch?v=quyPRHsNSi8. I bought my 2001 M5 with 95K miles back in 2011 sight unseen off of autotrader.com and expected there would be some issues but since I purchased it specifically for the track I was not too concerned. It definitely did not have the power of other M5s I test drove so I took it to the shop and found the major issue was two bad MAFS and at the cost of $400 each we started talking about options. I already knew I wanted the mufflers removed but a full exhaust (less headers) was proposed. The clincher was they guaranteed they would keep the check engine light off and that it would pass an OBDII emissions test (obviously not a tailpipe test) as I wanted to keep it registered for street use.
The shop fabricated tubing to fill the space the MAFS occupy and hand built a stainless steel exhaust that consists of a series of three resonators per side, two cross pipes (original exhaust only has one at the rear but the addition one upfront improves exhaust scavenging) and larger diameter exhaust tips. Once they had everything hooked up they dyno tuned it. Not only did it increase hp over stock by 50 it also smoothed out both the torque and hp curves. The engine runs through the rpm range much better and also gets better gas mileage. I've never had an issue in the seven years and additional 45K miles I've had it. I no longer live in Illinois and don't have to worry about emissions anymore but I did have the shop take it for testing while I was there as I have a terrible poker face :-D
What kind of gas mileage do you get?
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post #26 of 30 Old 3rd November 2018, 04:29 PM
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Not sure I would delete cats or muffler (just my $.02), but the secondary air system plays no beneficial role whatsoever, so I would delete that. We delete it in every engine we build, blocking off the secondary air ports in the heads and throwing away the pump. The ECU can be recoded to ignore the absence of the pump. Not always an option in jurisdictions that engage in emissions testing.

As for MAFs, they are expensive to replace, and the engine can be run very well with alpha-n (throttle angle) in lieu of the MAF. That said, the engine can be tuned to run very powerfully and smoothly with the MAFs.

--Peter
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post #27 of 30 Old 5th November 2018, 09:51 AM
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Get INPA & Testo working and start observing and logging parameters instead of guessing which part you throw at it.

To///Mba
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post #28 of 30 Old 7th November 2018, 01:50 AM
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To answer you question, the SAI (Air Pump) running or not will not damage the catalytic converters.

As to what GMETTUS is stating, removal of the catalytic converters is pointless. This is not an early emissions vehicle with a dual bed monolith converter. Removing them, even on a supercharged application, is of no benefit. The exception is a full track build where the weight reduction can be helpful, providing that you are competing at a level where 0.001 seconds are a factor; but I would ask why did you start with a 2000Kg vehicle in the first place.

Also, get you hands on a copy of INPA and DIS and start a proper diagnosis.

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post #29 of 30 Old 7th November 2018, 02:45 PM
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Quote:
Originally Posted by gmettus View Post
Since you state you live in a part of Wisconsin that doesn't require emissions testing, do yourself a huge favor; take this opportunity to get rid of the cats, mufflers and MAFS. This advice is contingent on the availability of a shop that can do this kind of work for you. If you live reasonably close to Naperville, Illinois I can strongly recommend one, https://www.youtube.com/watch?v=quyPRHsNSi8. I bought my 2001 M5 with 95K miles back in 2011 sight unseen off of autotrader.com and expected there would be some issues but since I purchased it specifically for the track I was not too concerned. It definitely did not have the power of other M5s I test drove so I took it to the shop and found the major issue was two bad MAFS and at the cost of $400 each we started talking about options. I already knew I wanted the mufflers removed but a full exhaust (less headers) was proposed. The clincher was they guaranteed they would keep the check engine light off and that it would pass an OBDII emissions test (obviously not a tailpipe test) as I wanted to keep it registered for street use.
The shop fabricated tubing to fill the space the MAFS occupy and hand built a stainless steel exhaust that consists of a series of three resonators per side, two cross pipes (original exhaust only has one at the rear but the addition one upfront improves exhaust scavenging) and larger diameter exhaust tips. Once they had everything hooked up they dyno tuned it. Not only did it increase hp over stock by 50 it also smoothed out both the torque and hp curves. The engine runs through the rpm range much better and also gets better gas mileage. I've never had an issue in the seven years and additional 45K miles I've had it. I no longer live in Illinois and don't have to worry about emissions anymore but I did have the shop take it for testing while I was there as I have a terrible poker face :-D
Nothing makes a nice car feel shitty faster than going catless.
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post #30 of 30 Old 9th November 2018, 01:38 AM
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Quote:
Originally Posted by AGM5 View Post
T The exception is a full track build where the weight reduction can be helpful, providing that you are competing at a level where 0.001 seconds are a factor; but I would ask why did you start with a 2000Kg vehicle in the first place.
I resemble that remark!

--Peter
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