Author Topic: Exhaust popping  (Read 2816 times)

Offline Ringosdad

  • New Egg
  • *
  • Posts: 76
  • 07 Norge
  • Location: Uniontown Pa
Exhaust popping
« on: May 16, 2019, 04:03:23 PM »
My Norge is popping on deceleration. I have a mistrel exhaust. Anybody know a good fix?
Never look straight up at a bird

oldbike54

  • Guest
Re: Exhaust popping
« Reply #1 on: May 16, 2019, 04:34:40 PM »
 Beetle map , Beetle map , Beetle map .

 Dusty

Offline guzzisteve

  • Gaggle Hero
  • *****
  • *
  • Posts: 11423
  • "Just Ride It"
Re: Exhaust popping
« Reply #2 on: May 16, 2019, 05:01:19 PM »
Yes, Beetle has the 'touch' you might say. I just got one to put in a G. Excellent costumer service also.
"Pray through Carlo & your bike shall be healed"
Location: Planet Earth

Offline lucian

  • Gaggle Hero
  • *****
  • *
  • *
  • *
  • *
  • Posts: 3316
  • Location: Maine, Ayuh
Re: Exhaust popping
« Reply #3 on: May 16, 2019, 05:54:46 PM »
Had the same issue with my Griso with a termi pipe. A beetle map totally transformed the fueling from bottom to top. If you need help to load it he will help with that to. We are fortunate to have him here . See the link below to see more of what he does to make life more enjoyable for us with FI guzzi's




https://wildguzzi.com/forum/index.php?topic=96957.0

Wildguzzi.com

Re: Exhaust popping
« Reply #3 on: May 16, 2019, 05:54:46 PM »

Offline giusto

  • Gaggle Hero
  • *****
  • *
  • Posts: 1220
  • Giusto il canne del Como
    • photobucket
  • Location: Traverse City Michigan
Re: Exhaust popping
« Reply #4 on: May 16, 2019, 05:56:18 PM »
My Norge is popping on deceleration. I have a mistrel exhaust. Anybody know a good fix?




Hey Pappa Ringo, let's see the girl

I just bought an 08 Norge last week...fly and ride from North Dakota...a wonderful 1100 miles
2020 V 85 TT Travel
76 V1000 Convert Mr. Slate
76 V1000 Convert...in restoration process
2008 Norge Mia
2007 Breva
66 Benelli 125
68 Gilera 106
č il viaggio non la destinazione che č importante

Offline Bulldog9

  • Gaggle Hero
  • *****
  • *
  • *
  • *
  • *
  • *
  • Posts: 2670
  • Location: United States
Re: Exhaust popping
« Reply #5 on: May 16, 2019, 07:01:26 PM »
Plus 100 on the Beetle map. Something to keep in mind is that the Norge seems to pop and burble a little more on overrun then other Guzzi's even in stock state.
MGNOC#23231
The Living: 1976 Convert, 2004 Breva 750, 2007 GRiSO, 2008 1200 Sport, 2016 Stornello #742,
The Departed: 2017 MGX, 2014 Norge GT, 
In Stasis: 1978 XS750, XS1100SF

Offline Ncdan

  • Global Moderator
  • Gaggle Hero
  • *
  • *****
  • *
  • *
  • *
  • *
  • *
  • Posts: 5878
Re: Exhaust popping
« Reply #6 on: May 16, 2019, 07:02:17 PM »
Make sure all exhaust connections are tight and no leaks.

Offline Buckturgidson

  • Gaggle Mentor
  • ****
  • Posts: 536
  • Location: Reno Nevada and Plumas County CA
Re: Exhaust popping
« Reply #7 on: May 16, 2019, 07:13:48 PM »



Hey Pappa Ringo, let's see the girl

I just bought an 08 Norge last week...fly and ride from North Dakota...a wonderful 1100 miles

Congrats, 2V Norges are the bomb. My exhaust burbles, who cares?
"It's not your job to be as confused as Nigel." -Spinal Tap.
"Wagner's music is better than it sounds." -Mark Twain



'86 Yamaha SRX-6
'07 Norge, Rosina, the classy one

Offline cappisj1

  • Gosling
  • ***
  • *
  • *
  • Posts: 286
  • Location: Illinois
Re: Exhaust popping
« Reply #8 on: May 16, 2019, 07:48:52 PM »
Check your “collector” or “two into one” pipe. If it’s cracked it will pop on deceleration. I had mine welded. Popping significantly reduced. Ran better too. The beetle map is my next adventure. 

Pizza Guzzi

  • Guest
Re: Exhaust popping
« Reply #9 on: May 17, 2019, 01:23:20 AM »
Well I don't have a Norge but I do have Mistrals and Beetle map on a V7 111 and zero decel popping. In my experience Marks not happy until you are 👍

Glenn.

Offline randy yocum

  • Hatchling
  • **
  • *
  • Posts: 135
  • Location: Missouri
Re: Exhaust popping
« Reply #10 on: May 17, 2019, 06:47:59 AM »
That's a good point,on inspection my 2 into 1 collector pipe on my 2007 Norge I found it was severally cracked almost in two.luckily it was easy to remove ,and a quick weld job remedied the situation,I'm ready to ride again.
2012 Stelvio NTX
2007 Norge
1998 EV
1981 V-1000 G-5
1997 Ducati 900ss
1983 XL 600R bought new
1978 XS 1100

Offline rocker59

  • Global Moderator
  • Gaggle Hero
  • *
  • *****
  • *
  • *
  • *
  • *
  • *
  • Posts: 24009
  • "diplomatico di moto"
  • Location: NW Arkansas
Re: Exhaust popping
« Reply #11 on: May 17, 2019, 07:49:29 AM »
My Norge is popping on deceleration. I have a mistrel exhaust. Anybody know a good fix?

dB killer installed, or not ??
Michael T.
Aux Arcs de Akansea
2004 California EV Touring II
"Do what you can, with what you have, where you are." - Theodore Roosevelt

pete roper

  • Guest
Re: Exhaust popping
« Reply #12 on: May 17, 2019, 08:20:37 AM »
The reason you will get popping on the overrun with standard mapping on W5AM Guzzis, and probably others, is simple.

Ignoring facts like cracks in pipes or failed gaskets the system works so that when you go to a negative throttle, (Sub 5* of opening.) with factory mapping no matter what the engine speed the ECU will continue to deliver the correct amount of fuel to maintain idle.

Unfortunately, because the engine is pumping harder at higher crank speeds more air gets pushed past the throttle plates so the mixture becomes incombustibly lean but as the engine cycles residual mixture from previous failed cycles will hang around and then every few cycles the mix will become combustible and ignite. When that happens the moment the exhaust valve starts to open the hot gasses exiting the combustion chamber will ignite the previously unburnt charge/s in the exhaust causing the backfiring.

With Mark's maps the fuel is cut entirely on a negative throttle until the crank speed drops to less than, (I think, generally.) 2,700 rpm. With no fuel being delivered there is nothing being pumped through the engine to combust either in the combustion chamber or the exhaust pipe. Hence no 'Popping'.

This system does mean that there is a slight, but noticeable, increase in engine braking and if one is running down a hill and decelerating on a negative throttle, at 2,700 rpm there is a slight lurch as the fuel kicks back in. It's not intrusive or, in the ordinary course of events, even noticeable. There is a long speed limited hill going into Queanbeyan though that finishes at the beginning of the 60 KPH zone. I often amuse myself by rolling down that hill in sixth gear and trying to judge it so that I get the 'Fuel Lurch' at the same point just before the 60k speed sign. I'm pathetically easily entertained though! :boozing: When it does cut back in though, depending on temperature and how serious I am about a fully closed throttle, get one small 'Pop' as the fuel cuts back in but only if I'm being a lazy slob and ambient temperature is between about 25-27*C as seen by the dash! :grin:

Pete

Offline M0T0Geezer

  • Gaggle Mentor
  • ****
  • Posts: 575
    • The Ones I Rode
  • Location: Sun City West, AZ
Re: Exhaust popping
« Reply #13 on: May 17, 2019, 08:22:51 AM »
Make sure all exhaust connections are tight and no leaks.

Ditto that, and specifically: Carefully check the "Y" exhaust collector for cracks (leaks) - Item 13.

'Geezer


2007 Moto Guzzi Norge 1200 USA

My 65+ years of motorcycling here:

http://www.dansher.com/mywheels.htm

Wisdom from the road:

http://www.dansher.com/bikequotes.html

Play guitar or keyboard?  You will like:

http://www.dansher.com/audio/pdf_tunes.html

Offline Ringosdad

  • New Egg
  • *
  • Posts: 76
  • 07 Norge
  • Location: Uniontown Pa
Re: Exhaust popping
« Reply #14 on: May 17, 2019, 01:47:59 PM »







Hey Pappa Ringo, let's see the girl

I just bought an 08 Norge last week...fly and ride from North Dakota...a wonderful 1100 miles
Never look straight up at a bird

Offline Bulldog9

  • Gaggle Hero
  • *****
  • *
  • *
  • *
  • *
  • *
  • Posts: 2670
  • Location: United States
Re: Exhaust popping
« Reply #15 on: May 17, 2019, 03:21:17 PM »
Thanks Pete, probably the best explanation I've seen on overrun popping.

The reason you will get popping on the overrun with standard mapping on W5AM Guzzis, and probably others, is simple.

Ignoring facts like cracks in pipes or failed gaskets the system works so that when you go to a negative throttle, (Sub 5* of opening.) with factory mapping no matter what the engine speed the ECU will continue to deliver the correct amount of fuel to maintain idle.

Unfortunately, because the engine is pumping harder at higher crank speeds more air gets pushed past the throttle plates so the mixture becomes incombustibly lean but as the engine cycles residual mixture from previous failed cycles will hang around and then every few cycles the mix will become combustible and ignite. When that happens the moment the exhaust valve starts to open the hot gasses exiting the combustion chamber will ignite the previously unburnt charge/s in the exhaust causing the backfiring.

With Mark's maps the fuel is cut entirely on a negative throttle until the crank speed drops to less than, (I think, generally.) 2,700 rpm. With no fuel being delivered there is nothing being pumped through the engine to combust either in the combustion chamber or the exhaust pipe. Hence no 'Popping'.

This system does mean that there is a slight, but noticeable, increase in engine braking and if one is running down a hill and decelerating on a negative throttle, at 2,700 rpm there is a slight lurch as the fuel kicks back in. It's not intrusive or, in the ordinary course of events, even noticeable. There is a long speed limited hill going into Queanbeyan though that finishes at the beginning of the 60 KPH zone. I often amuse myself by rolling down that hill in sixth gear and trying to judge it so that I get the 'Fuel Lurch' at the same point just before the 60k speed sign. I'm pathetically easily entertained though! :boozing: When it does cut back in though, depending on temperature and how serious I am about a fully closed throttle, get one small 'Pop' as the fuel cuts back in but only if I'm being a lazy slob and ambient temperature is between about 25-27*C as seen by the dash! :grin:

Pete
MGNOC#23231
The Living: 1976 Convert, 2004 Breva 750, 2007 GRiSO, 2008 1200 Sport, 2016 Stornello #742,
The Departed: 2017 MGX, 2014 Norge GT, 
In Stasis: 1978 XS750, XS1100SF

 

***Wildguzzi Official Logo High Quality 5 Color Window Decals Back In Stock***
Shipping in USA Only. Awesome quality. Back by popular demand. All proceeds go back into the forum.
http://www.wildguzzi.com/Products/products.htm
Advertise Here