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Author Topic: Knock, Knock, Knock after installing exhaust and tuner  (Read 1352 times)

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willyB

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Knock, Knock, Knock after installing exhaust and tuner
« on: January 01, 2011, 01:24:24 PM »
I recently installed V&H dresser duals and V&H High Output slipons on my 2011 SE Street Glide. Before I installed tuner I started it in the garage to hear it. NOTE! Did not let it idle for more than a minute. Seemed to be fine, no odds noises etc.

Just installed PowerCommander V, purchased from FuelMoto with map. Now I seem to have a KNOCK in the motor!!!!!!!!!!!!!!!!!!!!!!!!

HELP!!!!!
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GMR 577 Cams, S & S Lifters, S & S Pushrods, V&H Headers, Rinehart 4” Slipons, TTS Tuner, 12" Yaffee Monkey Bars, Color Matched Chopped Tour Pak (510 HP and 763 TQ +/-)

sadunbar

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #1 on: January 01, 2011, 02:04:22 PM »
Quote from: willyB on January 01, 2011, 01:24:24 PM
I recently installed V&H dresser duals and V&H High Output slipons on my 2011 SE Street Glide. Before I installed tuner I started it in the garage to hear it. NOTE! Did not let it idle for more than a minute. Seemed to be fine, no odds noises etc.

Just installed PowerCommander V, purchased from FuelMoto with map. Now I seem to have a KNOCK in the motor!!!!!!!!!!!!!!!!!!!!!!!!

HELP!!!!!

An exhaust leak at the head can sound like a knock.... 
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willyB

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #2 on: January 01, 2011, 02:33:48 PM »
Quote from: sadunbar on January 01, 2011, 02:04:22 PM
An exhaust leak at the head can sound like a knock.... 
I'll definitely check that out but I didn't "feel" any leaks at the head. Could that create an exessive heat issue on the head pipe at that area?
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GMR 577 Cams, S & S Lifters, S & S Pushrods, V&H Headers, Rinehart 4” Slipons, TTS Tuner, 12" Yaffee Monkey Bars, Color Matched Chopped Tour Pak (510 HP and 763 TQ +/-)

ssls6

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #3 on: January 01, 2011, 03:08:43 PM »
just as a sanity check, look to see if the exhaust is banging on a hard part somewhere.

RLK
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willyB

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #4 on: January 01, 2011, 03:45:16 PM »
Quote from: ssls6 on January 01, 2011, 03:08:43 PM
just as a sanity check, look to see if the exhaust is banging on a hard part somewhere.

RLK
The first thing I thought was that the pipe was hitting to floor board bracket. I did a reasonable check for that already so I'm heating up the garage now to double check EVERYTHING. It's 35 out here is St. Louis right now with clear blue skies.

If all goes well I've got to get this thing out for a riding tomorrow, even though it's still going to be in the 30's. It was such a sluggish pig with the stock cat exhaust and stock mufflers before I can only imagine how much better it's going to run. Can't wait!
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GMR 577 Cams, S & S Lifters, S & S Pushrods, V&H Headers, Rinehart 4” Slipons, TTS Tuner, 12" Yaffee Monkey Bars, Color Matched Chopped Tour Pak (510 HP and 763 TQ +/-)

willyB

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #5 on: January 01, 2011, 04:13:43 PM »
Quote from: ssls6 on January 01, 2011, 03:08:43 PM
just as a sanity check, look to see if the exhaust is banging on a hard part somewhere.

RLK

Thanks for the good advice. I couldn't wait for the garage to warm up so I just went out and started it up. Sure enough the front header pipe is barley hitting the floor board bracket. I checked before but this time I really pulled door on the floor board. I guess the supplied spacers from V & H were about 1/32" too narrow OR the chrome covers were a little to wide.

Anyway, it's fixed thanks to the folks at CVOHARLEY.COM.!! :bananarock:

ps: Going to take it for a spin right now!
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Envithyx

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #6 on: January 01, 2011, 04:28:57 PM »
I had the same issue with the V&H duals on my 2011 Limited.  Note: I used the 2009 version vs the 2010/11 because of the changes to the O2 sensor bung size and location.
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willyB

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #7 on: January 01, 2011, 07:08:43 PM »
Thanks to everyone for their replies.

The problem was a pretty simple fixed. The cutout area of the heat shield at the floor board was barely touching the floor board bracket when the motor was running and vibrating. All I did was loosen the shield and slide it more forward. Got about 1/8" extra clearance. Problem solved! :2vrolijk_21:

Took the 2011 Hazer for a quick ride around the area. WOW! What a difference in performance! Just based on the short ride in 35 degree weather the throttle response was very good. No popping, no hesitation and a huge improvement in performance. We'll see how it runs after the weather turns but for now, FuelMoto's MAP worked perfect.

Please send some warm weather my way.
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GMR 577 Cams, S & S Lifters, S & S Pushrods, V&H Headers, Rinehart 4” Slipons, TTS Tuner, 12" Yaffee Monkey Bars, Color Matched Chopped Tour Pak (510 HP and 763 TQ +/-)

ssls6

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Re: Knock, Knock, Knock after installing exhaust and tuner
« Reply #8 on: January 01, 2011, 09:36:37 PM »
Awesome news.  Love it when a plan comes together.  I just did Rinehart TDs, ventilator AC, & TTS tune on mine.  Pleased as punch with the outcome.
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