termi db killers modifying

Started by sbrguy, December 04, 2009, 04:41:29 AM

Previous topic - Next topic

sbrguy

to those of you that put the db killers in did you modify them at all? i've heard that putting them in sorta makes your bike run rich bc of the extra constriction so people split the difference by cutting off the end of them, how did that work out? is it still quieter than without them in at all?

thanks.


2 Wheel Wanderer

Here's a threads where someone drilled bigger holes in their DB to get the sound they were looking for. Maybe this is another option for you.

http://ducatimonsterforum.org/index.php?topic=11201.0


Raux

there are a few parts to teh termi system.
free flow airfilter
lack of catalytic converter (i think the TI still has them though but noone i know has them to confirm this)
removable DB killers
DP ECU

the DP ECU takes into account those changes. the real change that matters is the amount of air INTO the motor. That is the critical part that the DP ECU is for. More air IN needs more FUEL in or you run lean.

the exhaust affect things like tq and hp curves but not the air/fuel mixture.
so, putting your DB killers in or out does not affect whether you run lean or rich. it's the free flow airfilter that the key here.

go ahead and be kind to your neighbors. keep them in. your hp may come down a bit, but your tq curve will probably be better on the low RPM range cause you'll be adding backpressure.

take them out and you'll feel the extra hp and your tq may move to the right. but hope you don't go to work at 6am. unless your neighbor is a fellow Ducatisti, then you HAVE TO leave them out  [moto]

all this information is on here in the tech section just have to glean it from ALOT of threads

Raux

also you can't remap the 696/1100 stock or DP ECU. at least not yet.

sbrguy

what i have is a pc3 that is mapped for the bike with the termi slip ons, i know i didnt' need it but its there, and this was mapped without the db killers in.

so i got a set of db killers to make things a bit quieter, i have heard the hp will go down by maybe 1-3 hp but rmember my bike only gets 60hp stock, so worst case is that it brings it down to stock.

good to know that the a/f mixture won't cahnge at all.

i'm going to experiment with them to hear how they sound with them in right now.

what will the extra backpressure do if anything, besides the hp an tq as you mentioned.? 

afterall it can't be any more backpressure than the stock cans  right? or am i wrong on this?

Raux

hmmm. sorry. i was really talking about DucaChic's bike. but the issue should still be the same for the air/fuel mixture.

Your bike is? depending on the model you may or may not have the Catalytic converter. did you have the udder? did you keep it when you changes the pipes?


Strafer

`09 Monster 1100S + Termi carbon cans w/ECU/filter + Gutted dB Killers + Tech Spec tank pads + Evotech fender eliminator + 14-T sprocket + Speedymoto sliders + Beltronics RX-65 radar detector

Raux

to be honest. cutting up the DB killers isn't so great. they cut the db to legal limits. get rid of that and if you ever have to get the bike inspected you'll have to put the stock system back on to pass noise levels.

ducpainter

Quote from: Raux on December 05, 2009, 02:14:39 AM
to be honest. cutting up the DB killers isn't so great. they cut the db to legal limits. get rid of that and if you ever have to get the bike inspected you'll have to put the stock system back on to pass noise levels.
In the US many states have different requirements for noise, so inspection isn't necessarily an issue.
"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent."



Strafer

Quote from: Raux on December 05, 2009, 02:14:39 AM
to be honest. cutting up the DB killers isn't so great. they cut the db to legal limits. get rid of that and if you ever have to get the bike inspected you'll have to put the stock system back on to pass noise levels.

One man's "great" may be another man's misfortune. Each to his/her own.
`09 Monster 1100S + Termi carbon cans w/ECU/filter + Gutted dB Killers + Tech Spec tank pads + Evotech fender eliminator + 14-T sprocket + Speedymoto sliders + Beltronics RX-65 radar detector

sbrguy

i have an older 620 the cat convert in those were originally part of the lowmount pipes thus the reason why they weighed so much, so take off the stock lo mounts you stake off the cat convert.

so i just changed those out and went with the termi low mounts which as you know are just straight trought with minimal baffling.

i see that strafer basically did what a lot of people say, first test them out with the db killers "as is"  and that is how my bike is now, defeinitley quieter which isn't too bad.  and then he did the normal thing which is cut off the flat end of it, and most people as he mentioned like that "middle ground" and keep it as such.  if i do anything i'll do that and stop there probabaly. i porbably won't go the extreme like he did and just use the "outside ring" only, but the thing that stinks is that the ring is tough as hell to get in and out, i have to get a sliding hammer to get mine out now.


d6a9p6

I cut the tube off leaving a flat plate with a hole-lets me troll with small throttle openings in relative quiet . let the throttle control the tone!~wot it barks!~   Don

patorojo

Here is a post showing my modified DB killers.  I basically just kept drilling holes until I got the sound I wanted.

http://ducatimonsterforum.org/index.php?topic=23487.msg415899#msg415899
Arne Berger
2007 S2R1K
2007 DL650
2005 DRZ400S

sbrguy

basically all i ended up doing was drilling a 3/8 inch hole in the bottom of the db killer, since the thing is only about 1.25 inches in diameter for now its fine.

like others said, basically, when you do this it makes it a little bit louder at idle, though i would say only slilghtly, its whne you go over 3k rpm or so that then the "classic" termi sound really comes out when you throttle it fast.  Its obviously not as loud as without the db killers in it, but its still got a good sound that is moderately loud that is 10x better than the stock exhaust.  as others mentioned it makes it loud wihtout being ear peircing even when you throttle is fast.

now i only drilled a 3/8 inch hole in teh end of each one, i may get a larger bit and bore it out to 3/4 inch which is almost the same as cutting off the end completely but i'll do that in stages.

and loke other said, the only way to get these damn things out is with a slide hammer, no otehr way, especially with the older low mounts as they have a bend in teh pipe that connects to the headers so a broomstick trick does not work at all.

Strafer

Quote from: sbrguy on December 18, 2009, 04:09:26 AM

and loke other said, the only way to get these damn things out is with a slide hammer, no otehr way, especially with the older low mounts as they have a bend in teh pipe that connects to the headers so a broomstick trick does not work at all.

When I had my dB Killers out, I took the time to power-sand the round edges of them for a loosely snug slide-fit into the muffler. It worked...! Now, I can easily pull them out (from the muffler end) without undue trauma yet the fit is close enough for them to stay put.  ;)
`09 Monster 1100S + Termi carbon cans w/ECU/filter + Gutted dB Killers + Tech Spec tank pads + Evotech fender eliminator + 14-T sprocket + Speedymoto sliders + Beltronics RX-65 radar detector