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Deceleration exhaust noises
- Thread starter basaltine
- Start date
lucky phil
Cruisin' Guzzisti
Its a little lean at the bottom of the map. Lean mixtures dont completly burn in the chamber and continue in the exhaust system esp with any slight leak that draws in some air. If you richen it up a little right at the bottom it ( by some method) should stop. Make sure you have no small exhaust leaks as well.
Ciao
Ciao
What you are experiencing is what is referred to as "pop on decel." It's a lean condition. The fuel system is not fully adaptive and is delivered very lean for stringent emissions, even stock. When modifying the intake or exhaust flow, fuel modification is mandatory. I have several options in the GT Exclusive Products section (see my GT-Rx ECU mod, or PC-V threads), or feel free to contact me direct email using the link under my pic to the right.->
Greyo
Cruisin' Guzzisti
Try and put the db-killer back in and see if that makes it a bit better (it may not, but worth a try).basaltine said:
I can already tell you it won't. Mine is in on my new Mistral Carbon Conical and I've got some pretty good decel pop. My service guy did a very fair TB balance, valve adjustment and general tune up and the bike runs almost smooth thru all ranges. There is that annoying 3500 ish range lag but as I'm about to hit the road, I'm living with it. It is definitely a lean issue and when I get to Sou Cal sometime in the next six months I may get it taken care of. In my experience, even a remapping won't entirely fix decel pop when dealing with an aftermarket can.
BravoBravo
Cruisin' Guzzisti
After I put the Mistral can on my Stelvio, I noticed quite a bit of popping on deceleration. This was entirely cured when I added Todd's O2 optimizer. The optimizer is now sold as part of his remapping package.
-Bruce
-Bruce
Greyo
Cruisin' Guzzisti
Running your engine even leaner than stock isn't likely to further its prospects of a long, trouble-free life...UKstridey said:
Greyo said:
Thanks for reply and I checked with my dealer who serviced it last Friday (6000 miles) and he said no problem with the can popping on throttle over-run (ie throttle closed) and it won't damage the engine. This dealer sold the can and fitted it.
Not to take anything away from your commitment to Guzzidom with your hard work here and great products, but I think 'mandatory' is a bit too strong. 'Recommended' would be more appropriate, at least for those of us who have non-OEM exhausts, OEM fueling, and are enjoying spirited miles on our 8V's with that combination.GT-Rx said:
Fair enough, then I *highly recommend* fueling revisions on even a bone stock bike. The air/fuel data I've gathered on the dozens I've personally tested is incredibly lean... so even a stock bike would benefit, much less one that has been modified. This is based on real world/scientific data, not feel.Goodvibes said: