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Heinno
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« on: February 02, 2011, 10:03:36 AM » |
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So I installed the 6-into-6 pipes - love the sound.
The bike runs pretty smooth just as is, so if I choose NOT to re-jet, would it increase,decrease performance if I get a K&N airfilter?
Also, thinking of getting that aftermarket trigger wheel - good or bad idea with cobra's and OEM jets?
Any advice welcome....
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #1 on: February 02, 2011, 10:10:41 AM » |
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GO FOR IT!!!
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Heinno
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« Reply #2 on: February 02, 2011, 10:20:44 AM » |
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GO FOR IT!!!
Do you mean the K&N as well as the trigger wheel? |
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #3 on: February 02, 2011, 01:18:10 PM » |
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heinno.....the k&n filter is the best way to go. on my valk "tourer" i have done this: k&n filter/6-degree trigger wheel/105 mains/38 slows/ fuel air screws out 1 1/2 turns from stop/i also run a icm from the interstate model.
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #4 on: February 02, 2011, 01:19:31 PM » |
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oh-ya, i have cobra 6 into 6 exhaust on it.
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Heinno
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« Reply #5 on: February 02, 2011, 03:48:22 PM » |
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heinno.....the k&n filter is the best way to go. on my valk "tourer" i have done this: k&n filter/6-degree trigger wheel/105 mains/38 slows/ fuel air screws out 1 1/2 turns from stop/i also run a icm from the interstate model.
How many miles do you get on a tank? |
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #6 on: February 02, 2011, 05:30:20 PM » |
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heinno...i get approx. 39-42 mpg.
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Heinno
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« Reply #7 on: February 02, 2011, 07:41:50 PM » |
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heinno.....the k&n filter is the best way to go. on my valk "tourer" i have done this: k&n filter/6-degree trigger wheel/105 mains/38 slows/ fuel air screws out 1 1/2 turns from stop/i also run a icm from the interstate model.
Sorry for the ignorance, but what is an ICM? |
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #8 on: February 02, 2011, 09:49:04 PM » |
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the computer module.
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PhredValk
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« Reply #9 on: February 02, 2011, 10:04:01 PM » |
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Ignition Control Module.
Fred.
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Growing old is mandatory, growing up is optional.
VRCCDS0237
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Doc809
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« Reply #10 on: February 03, 2011, 08:15:41 AM » |
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Put Cobra 6x6 on a 03 std. Had the local stealership rejet the carbs with a Cobra kit. MPG went down to 22 and nobody seems to be able to tell my why or what to do about it! Was getting 32 before. Have changed air filter, vacuum hoses, fuel hoses, petcock, etc with no improvement. Arrrrrgh!!
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How much fun can I have before I have to go to hell?
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Ricky-D
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« Reply #11 on: February 03, 2011, 01:26:34 PM » |
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Not too hard to figure that out!
***
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2000_Valkyrie_Interstate
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Momz
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« Reply #12 on: February 03, 2011, 02:31:32 PM » |
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My 98 standard has the Cobras, I/S ECM & I/S carb springs, ECT Mod, polished intakes, and been desmoged.
I have been getting consistantly 43+ MPG.
If you come to IZXI, join me in a Fuel Milage Challange. (Details to follow)
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« Last Edit: February 04, 2011, 08:38:09 AM by Momz »
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 ALWAYS QUESTION AUTHORITY! 97 Valk bobber, 98 Valk Rat Rod, 2K SuperValk, plus several other classic bikes |
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Old Geezer Richard
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« Reply #13 on: February 04, 2011, 05:03:21 AM » |
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Hey Goose , I'm running the 6 deg.tw , cobra pipes with baffels and K&N filter and stock jetting and I/S springs ... have you noticed any difference in your bikes performance or gas mileage since you added the I/S ICM ? I had been kicking around the idea of the I/S ICM but thought it might conflict with the 6 deg tw .... right now if I stay at 3000 rpm's on the HWY , I'm getting 38 - 40 mpg ... what are you gaining by adding the I/S ICM with the trigger wheel ? Thanks the Geezer  |
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If you don't care where you're going, then you ain't lost , Murphy's Law because wherever you are going to , it ain't going nowhere .... San Antonio,Tx.
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #14 on: February 04, 2011, 12:32:25 PM » |
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geezer.....better than normal response up to 4500, after that i think a 4- degree wheel would be better. to answer your question a little better... i like the interstate icm with my set-up better than the stock icm.
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Heinno
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« Reply #15 on: February 05, 2011, 10:35:34 PM » |
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What will happen if you simply narrow the baffle inlets in the Cobra's by about 10% - would that not return the back pressure to normal (as per the stock exhaust) and return the hp to normal?
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GOOSE
Member
Posts: 704
D.S. #: 1643
Southwest Virginia
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« Reply #16 on: February 06, 2011, 12:17:20 AM » |
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heinno.....i don't think just doing that would bring the horsepower back up. you are not going to be able to tell a 7-8 hp drop on this bike anyway.
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Heinno
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« Reply #17 on: February 06, 2011, 04:19:03 PM » |
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heinno.....i don't think just doing that would bring the horsepower back up. you are not going to be able to tell a 7-8 hp drop on this bike anyway.
here is my thinking - why does the hp drop when you install the 6 into 6 - guess, it is because of the more free flow of exhause gasses - so to fix it, just restrict the flow again. (I am not a mechanic, nor do I have experience in this regard - but it seems to be logical to me) Has anybody tried it? |
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Buda
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« Reply #18 on: February 06, 2011, 04:26:15 PM » |
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here is my thinking - why does the hp drop when you install the 6 into 6 - guess, it is because of the more free flow of exhause gasses - so to fix it, just restrict the flow again. (I am not a mechanic, nor do I have experience in this regard - but it seems to be logical to me) Has anybody tried it?
the free flowing exhaust will have you running lean...rejet the carbs to richen the mixture back up |
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97 Valkyrie 33344  |
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Heinno
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« Reply #19 on: February 17, 2011, 07:12:12 PM » |
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so I have installed the pipes, seems to be lagging a bit on the response but once the rpms gets a bit higher it seems like there is no difference.
I think I might be okay with just adjusting the air/feul mixture.... or just adding some more resistance in the baffles... I am surprised nobody tried this - or is my ignorance on the matter the problem?
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Printer Mike
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« Reply #20 on: February 17, 2011, 07:24:28 PM » |
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My un-rejetted 6's turned an ugly blue/brown color.
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Never give up!
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Momz
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« Reply #21 on: February 17, 2011, 07:47:44 PM » |
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I believe that if you could add torque cones at the pipe inputs.
That is increaseing the air flow and that may have a sort of venturi/scavenging effect.
I'm currently contacting a company here in MI that builds aircraft parts and custom exhaust kits (Woolf Eng.).
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ALWAYS QUESTION AUTHORITY! 97 Valk bobber, 98 Valk Rat Rod, 2K SuperValk, plus several other classic bikes |
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Heinno
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« Reply #22 on: February 17, 2011, 08:04:06 PM » |
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I believe that if you could add torque cones at the pipe inputs.
That is increaseing the air flow and that may have a sort of venturi/scavenging effect.
I'm currently contacting a company here in MI that builds aircraft parts and custom exhaust kits (Woolf Eng.).
It is my understanding that the Cobra's are more free flowing, so by adding some obstruction in the cobra baffles, you should get the same back pressure as in the OEM's? Will a ventury not cause it to run even more lean? |
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Momz
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« Reply #23 on: February 18, 2011, 01:46:22 PM » |
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Actually the OEM pipes, although more restrictive, flow better than the Cobra 6x6s.
Lean conditions are most likely addressed by the Jet neddle kit that should be installed at the time the pipes were put on.
If you want to get the best out of the Cobras, get a "Factory Pro" jet kit and have your bike dynoed by a reputable shop. The Dyno should have a air/fuel probe so that they can rejet at the proper RPM and fuel delivery circuit.
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« Last Edit: February 18, 2011, 01:55:09 PM by Momz »
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ALWAYS QUESTION AUTHORITY! 97 Valk bobber, 98 Valk Rat Rod, 2K SuperValk, plus several other classic bikes |
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