Moderate decel popping
Elite HDF Member
Joined: Sep 2007
Posts: 4,928
Likes: 69
From: Near Myrtle Beach, SC
I check my exhaust stud nuts about every 6 months and I always find that they need a little snugging-up to the torque spec. I am careful not to exceed the torque spec of around 120 inch pounds, so it's no big deal to check them.
With all that heat cycling and vibration, those nuts are simply not going to stay in place well (unless they are rusted, over-tightened, cross-threaded, galled, or seized). It takes only a few minutes to check them, but you need a quality torque wrench or you chance screwing the pooch.
Thread Starter
|
Tourer
Joined: Jan 2010
Posts: 374
Likes: 5
From: Overland Park, Ks
I have changed head pipe, slip-ins and air breather. I have a map for my PV then ran 4 auto tune sections.
Sent the new tune to Fuel Moto and told Jamie my problem. Ran four more Auto Tunes on the revised map
from Jamie. Sill have the decel poping with no change at all that's why I think it's intake or exhaust or both.
Thanks for the info. I will do the recomeded test today.
Sent the new tune to Fuel Moto and told Jamie my problem. Ran four more Auto Tunes on the revised map
from Jamie. Sill have the decel poping with no change at all that's why I think it's intake or exhaust or both.
Thanks for the info. I will do the recomeded test today.
A combustible spray around the intake and exhaust ports will show a leak at the engine. To check for a leak where the slip-ons meet the headers, a match or lighter will show if there is air leaking there.
Here is a little info on the much discussed subject of decel pop-
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
Decel popping occurs when one of two things are present.
1. The bike is so lean the exhaust is superheated and is burning the unburnt fuel that is in the pipes (there is always some unburnt fuel in the pipes no matter how lean). This is very rare, and does not occur with the stock map and free flowing pipes being the only change.
2. The AFR IN THE pipes is just right to burn the unburnt fuel. This is quite a common occurrence when free flowing pipes are installed (whether or not a free flow A/C is installed). It can also occur if there is an exhaust leak that is introducing extra air into the exhaust tract.
To get rid of decel popping a lot of people put MORE fuel than is needed into the engine/over-richening the AFR so that more unburnt fuel goes into exhaust, changing the AFR in the exhaust so that is no longer optimum for combustion in the pipes. This is just a waste of gas. And if using decel enleanment found on most tuners it is still really hard to get rid of the popping/burbling when the injectors kick back in at about 1750 rpm.
Another way to get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
Here is a little info on the much discussed subject of decel pop-
Decel popping does Not damage your engine...it is simply unburnt fuel that is burning in the exhaust tract after exiting the engine.
Decel popping occurs when one of two things are present.
1. The bike is so lean the exhaust is superheated and is burning the unburnt fuel that is in the pipes (there is always some unburnt fuel in the pipes no matter how lean). This is very rare, and does not occur with the stock map and free flowing pipes being the only change.
2. The AFR IN THE pipes is just right to burn the unburnt fuel. This is quite a common occurrence when free flowing pipes are installed (whether or not a free flow A/C is installed). It can also occur if there is an exhaust leak that is introducing extra air into the exhaust tract.
To get rid of decel popping a lot of people put MORE fuel than is needed into the engine/over-richening the AFR so that more unburnt fuel goes into exhaust, changing the AFR in the exhaust so that is no longer optimum for combustion in the pipes. This is just a waste of gas. And if using decel enleanment found on most tuners it is still really hard to get rid of the popping/burbling when the injectors kick back in at about 1750 rpm.
Another way to get rid of decel popping is to change the AFR in the pipes (mufflers/Slip-ons). This can be done with different baffles, a lolipop or Thunder Torque Inserts. The benefit to the TTI's is that it will let you keep your sound, increase the low and mid range power, and reduce/eliminate the decel pop by reducing/eliminating reversion, thus changing the AFR (in the pipes) to one that is not conducive to combustion.
__________________
DKCustomProducts.com
DKCustomProducts.com
Road Captain
Joined: Apr 2010
Posts: 688
Likes: 350
From: Central Utah
The timing of the valves are mechanical and has nothing to do with the EPA. Valve overlap has been happening just about since day 1...
Your knowledge/understanding of decel popping is suspect. To state that simply switching out parts instead of determining where and under what conditions the pop occurs by way of properly diagnosing the problem (dyno's and all that crap) is truly the amateur way of doing things.
Your knowledge/understanding of decel popping is suspect. To state that simply switching out parts instead of determining where and under what conditions the pop occurs by way of properly diagnosing the problem (dyno's and all that crap) is truly the amateur way of doing things.
Thread
Thread Starter
Forum
Replies
Last Post
irlm1
Ignition/Tuner/ECM/Fuel Injection
30
Apr 22, 2023 06:52 PM
