Cobra Slip-on's a Mistake?

1oldtimer · 09-03-2013, 08:57 PM

Well I just recieved my PCVw/ign and will be installing it this weekend. I have Cobra Scalloped tip slip-ons and the K&N replacement filter. I have been reading everything related to PCV on this forum and am begining to think that the Cobra's are a mistake. It seems that those of you with the V&H slip ons have better results with eliminating the decel pop. I have been trying to tune out the decel pop with a Dolebeck EJK with no luck. In fact thier tech support told me after numerous calls that they could NOT tune out the decel popping?? Go figure. Why they didnt tell me that the first time I called?
I have davids map ready to install once I get the PCV installed and am hoping that I don't have the same issues. I have marbled and leak checked. Even put ss lock washers behind the acorn nuts.
I guess what I am looking for here is some feedback.......Anybody ?

Thanks,
Frank

Old Bear · 09-03-2013, 10:24 PM

I'm running the Tri-ovals, and just completed connecting the PCV extra connection for detecting speed and gear selection. I loaded a table for each gear and an AFR map for each as well. The popping in gears 1, 2 and 3 were gone after connecting the PCV. This latest change seems to have eliminated the popping in the upper gears as well. In short, I'm happy!

combat72 · 09-04-2013, 10:24 AM

1oldtimer,
I have the exact setup you are putting on. I too have the gear dependent mapping and have gotten rid of 99% of the decel popping. Nice rumble on decel instead of popping. Long stoory short is I went through everything suggested by forum members and played with numerous maps. In my case turned out to be related to adjusting the idle down by 50 rpm's. Changed it back to the stock setting and the decel pop was gone.

Frank

ta-kid · 09-08-2013, 11:18 PM

If you put your idle back to stock settings or higher you should be able to eliminate the back fire popping.Its done through your handle controls and LCD screen.

1oldtimer · 09-08-2013, 11:25 PM

Quote:

Originally Posted by ta-kid

If you put your idle back to stock settings or higher you should be able to eliminate the back fire popping.Its done through your handle controls and LCD screen.

Been playing with it all weekend.....What is the stock idle setting...00 ? Or +50 ?

logansrunner · 09-08-2013, 11:52 PM

Stock setting is zero. With the V & H stock AF and a good map no to little deceleration pop.

1oldtimer · 09-09-2013, 12:59 AM

Thanks, I'll set it back in the am and see if that helps me any.

smokey · 09-09-2013, 08:19 AM

Cobra told me the same thing, you can not get rid of the popping, they even said that a lot of people like the "Harley" sound, I told them in no uncertain terms that if I wanted the "Harley" sound I would have got a Harley, they were no help at all.

Old Bear · 09-09-2013, 08:36 AM

Added note: Over the past few days I noticed that I was still having some rather vicious popping in the higher gears. Then I had a thought - I try to not do that, might damage something. Anyway, I had been following the advice from from professional riding DVDs and blipping the throttle as I gear down. It occurred to me that this was "charging" the exhaust with an abundance of fuel, quite inviting a pop. So I quit doing that. THAT change in style made a BIG difference! While the bike does still pop on occasion, it is a much milder pop and it doesn't bother me. My MC wingman however, found the pretty blue flame coming out both pipes a little distracting!

ta-kid · 09-09-2013, 09:21 PM

1oldtimer PM sent.I find running the idle at 50 rpm higher then stock works the best without sounding like the bike is on fast idle.LOL

1oldtimer · 09-10-2013, 07:34 PM

I have also been thinking (smokey, it is contagious) that if I ride "normal" meaning not getting on the throtle hard, the popping aint so bad. But if I ride it hard, the popping is terrible. I have added ss lockwasers behind the acor nuts, installed the thunder mfg gasket, cheched for exhaust leaks, blocked the AIR and still get the popping and an ocasional backfire. Not only down shifting, but every now and then on the up shift. Do any of you have a sure fire way to check for intake leaks as well as exhaust leaks? I am just about raedy to give up here. Like many others, it seems that everytime I do somthing, it gets better until after an hour or so of riding. Then right back to square one.
Also, when I installed my PCV w/ign I did not zero my throttle. It was already at "0" and "100" at full twist. Is this somthing I need to do anyway?
I also am noticing a surge or hesitation at lower speeds. And I do have Rays throttle mod. Is it also possible it is not adjusted right?
Thanks for ALL your help.

Frank

smokey · 09-10-2013, 07:56 PM

well I went back to my v&h pro pipe, installed the quiet baffle insert from smartpartz and what a difference, subdued popping but still get that nice sound I wanted. I will keep the tri ovals for now and look at selling them in the spring. Cobra was no help what so ever and I don't think I will bother with them anymore.

ta-kid · 09-10-2013, 10:59 PM

Quote:

Originally Posted by 1oldtimer

I have also been thinking (smokey, it is contagious) that if I ride "normal" meaning not getting on the throtle hard, the popping aint so bad. But if I ride it hard, the popping is terrible. I have added ss lockwasers behind the acor nuts, installed the thunder mfg gasket, cheched for exhaust leaks, blocked the AIR and still get the popping and an ocasional backfire. Not only down shifting, but every now and then on the up shift. Do any of you have a sure fire way to check for intake leaks as well as exhaust leaks? I am just about raedy to give up here. Like many others, it seems that everytime I do somthing, it gets better until after an hour or so of riding. Then right back to square one.
Also, when I installed my PCV w/ign I did not zero my throttle. It was already at "0" and "100" at full twist. Is this somthing I need to do anyway?
I also am noticing a surge or hesitation at lower speeds. And I do have Rays throttle mod. Is it also possible it is not adjusted right?
Thanks for ALL your help.

Frank

Have you raised the idle rpm at "0" throttle position yet and gone for a test drive.If you raise it to +100 you should see a big difference in the backfire issue and reduced popping.

1oldtimer · 09-10-2013, 11:47 PM

Quote:

Originally Posted by ta-kid

Have you raised the idle rpm at "0" throttle position yet and gone for a test drive.If you raise it to +100 you should see a big difference in the backfire issue and reduced popping.

No I have not. I will try it this weekend. I am foo wed, thur and Fri this week. So that will give me a few days to get some tinkering in.

smokey · 09-11-2013, 08:28 AM

Quote:

Originally Posted by ta-kid

Have you raised the idle rpm at "0" throttle position yet and gone for a test drive.If you raise it to +100 you should see a big difference in the backfire issue and reduced popping.

I tried +50 and +100, made no difference to mine, and I checked for exhaust leaks and everything else I could think of, nothing helped.

09-03-2013, 08:57 PM	#1
1oldtimer Member Join Date: Sep 2012 Location: Va Posts: 122	Cobra Slip-on's a Mistake? Well I just recieved my PCVw/ign and will be installing it this weekend. I have Cobra Scalloped tip slip-ons and the K&N replacement filter. I have been reading everything related to PCV on this forum and am begining to think that the Cobra's are a mistake. It seems that those of you with the V&H slip ons have better results with eliminating the decel pop. I have been trying to tune out the decel pop with a Dolebeck EJK with no luck. In fact thier tech support told me after numerous calls that they could NOT tune out the decel popping?? Go figure. Why they didnt tell me that the first time I called? I have davids map ready to install once I get the PCV installed and am hoping that I don't have the same issues. I have marbled and leak checked. Even put ss lock washers behind the acorn nuts. I guess what I am looking for here is some feedback.......Anybody ? Thanks, Frank __________________ 2012 Vulcan Voyager 1700 ABS - Metallic Graystone / Metallic Spark Black VBA #02229 Login or Register to Remove Ads
	0

09-03-2013, 10:24 PM	#2
Old Bear Sr. Member Join Date: Jul 2012 Location: Clarksville, TN Posts: 1,432	I'm running the Tri-ovals, and just completed connecting the PCV extra connection for detecting speed and gear selection. I loaded a table for each gear and an AFR map for each as well. The popping in gears 1, 2 and 3 were gone after connecting the PCV. This latest change seems to have eliminated the popping in the upper gears as well. In short, I'm happy! __________________ Jerry "Old Bear" Barker Clarksville, TN Americas Guardians PS MC President, Tennessee 16-A VBA #02203 "Blaze" 2017 Vaquero "Black Magic" 2011 Vaquero, 69k miles, handed down to my son for hopefully many more miles!
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09-04-2013, 10:24 AM	#3
combat72 Jr. Member Join Date: Jan 2012 Location: Central NC Posts: 36	1oldtimer, I have the exact setup you are putting on. I too have the gear dependent mapping and have gotten rid of 99% of the decel popping. Nice rumble on decel instead of popping. Long stoory short is I went through everything suggested by forum members and played with numerous maps. In my case turned out to be related to adjusting the idle down by 50 rpm's. Changed it back to the stock setting and the decel pop was gone. Frank __________________ 2010 Voyager/ Metallic Diablo Black/Metallic Imperial Red 1972 Norton Commando - Yellow PCV(Fuel & Ignition) With Autotune Gear Advance Fuel & Ignition Mapping Cobra 4' Scalloped Tip Slip-Ons Wrapped Exhaust Manifold Kuryakyn ISO Grips with RacnRay Mod Kuryakyn Bar End weights Ultimate Mid-Rider Polk Audio DB521 speakers K&N Air Filter Rear Speakers Mirror Risers iPod Adapter
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09-08-2013, 11:52 PM	#6
logansrunner Jr. Member Join Date: Apr 2013 Location: Ontario Posts: 44	Stock setting is zero. With the V & H stock AF and a good map no to little deceleration pop. __________________ Bumblebee tastes way better than Dragon Fly 2011 Vaquero VBA 02386
	0

09-09-2013, 12:59 AM	#7
1oldtimer Member Join Date: Sep 2012 Location: Va Posts: 122	Thanks, I'll set it back in the am and see if that helps me any. __________________ 2012 Vulcan Voyager 1700 ABS - Metallic Graystone / Metallic Spark Black VBA #02229
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09-08-2013, 11:18 PM	#4
ta-kid Member Join Date: Aug 2012 Posts: 68	If you put your idle back to stock settings or higher you should be able to eliminate the back fire popping.Its done through your handle controls and LCD screen.
	0

09-09-2013, 08:19 AM	#8
smokey Sr. Member Join Date: Mar 2012 Location: Orleans, ON, Canada Posts: 1,162	Cobra told me the same thing, you can not get rid of the popping, they even said that a lot of people like the "Harley" sound, I told them in no uncertain terms that if I wanted the "Harley" sound I would have got a Harley, they were no help at all. __________________ Smokey Capt(retd) Canadian Forces National President CVFR (Canadian Veteran Freedom Riders) 2010 VN1700 Voyager, ABS www.cvfr.ca VBA #02220
	0

09-09-2013, 08:36 AM	#9
Old Bear Sr. Member Join Date: Jul 2012 Location: Clarksville, TN Posts: 1,432	Added note: Over the past few days I noticed that I was still having some rather vicious popping in the higher gears. Then I had a thought - I try to not do that, might damage something. Anyway, I had been following the advice from from professional riding DVDs and blipping the throttle as I gear down. It occurred to me that this was "charging" the exhaust with an abundance of fuel, quite inviting a pop. So I quit doing that. THAT change in style made a BIG difference! While the bike does still pop on occasion, it is a much milder pop and it doesn't bother me. My MC wingman however, found the pretty blue flame coming out both pipes a little distracting! __________________ Jerry "Old Bear" Barker Clarksville, TN Americas Guardians PS MC President, Tennessee 16-A VBA #02203 "Blaze" 2017 Vaquero "Black Magic" 2011 Vaquero, 69k miles, handed down to my son for hopefully many more miles!
	0

09-09-2013, 09:21 PM	#10
ta-kid Member Join Date: Aug 2012 Posts: 68	1oldtimer PM sent.I find running the idle at 50 rpm higher then stock works the best without sounding like the bike is on fast idle.LOL
	0

09-10-2013, 07:34 PM	#11
1oldtimer Member Join Date: Sep 2012 Location: Va Posts: 122	I have also been thinking (smokey, it is contagious) that if I ride "normal" meaning not getting on the throtle hard, the popping aint so bad. But if I ride it hard, the popping is terrible. I have added ss lockwasers behind the acor nuts, installed the thunder mfg gasket, cheched for exhaust leaks, blocked the AIR and still get the popping and an ocasional backfire. Not only down shifting, but every now and then on the up shift. Do any of you have a sure fire way to check for intake leaks as well as exhaust leaks? I am just about raedy to give up here. Like many others, it seems that everytime I do somthing, it gets better until after an hour or so of riding. Then right back to square one. Also, when I installed my PCV w/ign I did not zero my throttle. It was already at "0" and "100" at full twist. Is this somthing I need to do anyway? I also am noticing a surge or hesitation at lower speeds. And I do have Rays throttle mod. Is it also possible it is not adjusted right? Thanks for ALL your help. Frank __________________ 2012 Vulcan Voyager 1700 ABS - Metallic Graystone / Metallic Spark Black VBA #02229
	0

09-10-2013, 07:56 PM	#12
smokey Sr. Member Join Date: Mar 2012 Location: Orleans, ON, Canada Posts: 1,162	well I went back to my v&h pro pipe, installed the quiet baffle insert from smartpartz and what a difference, subdued popping but still get that nice sound I wanted. I will keep the tri ovals for now and look at selling them in the spring. Cobra was no help what so ever and I don't think I will bother with them anymore. __________________ Smokey Capt(retd) Canadian Forces National President CVFR (Canadian Veteran Freedom Riders) 2010 VN1700 Voyager, ABS www.cvfr.ca VBA #02220
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