2012 RoadKing with TW555 cams
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Stage IV
Joined: Aug 2014
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From: USA
2012 RoadKing with TW555 cams
I bought my bike from the dealer with Vance and Hines slip-ons and a stage 1 air cleaner kit. I later installed V&h dresser duals. I now wanted to get my bike dyno tuned and decided to also get TW 555 cams installed at the same time. Now my idle seems rough and erratic and my mpg is down from 40-42mpg to 31-33 mpg. The bike was tuned using a Screamin Eagle race tuner. I found a vacuum leak so I took the bike back to the tuner. He fixed the leak and it was put on the dyno again. Still the idle doesn't seem right to me but he says everything is good. Just wanted to see if there was anyone with a similar bike who has had the TW 555's installed and experienced the same issues.
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I had this combo in a 106" I recently built before I traded for my 2014 and had it set up at 10.45 compression. If it's tunes right the idle will be a little lumpy but not all that rough. Do you have a dyno sheet that shows the afr graph on it ? Also the idle enrichment may be set too rich on the start up and the afr may be too rich also.
By the way my bike ran awesome, 110hp and 128tq with those cams.
By the way my bike ran awesome, 110hp and 128tq with those cams.
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Joined: Jun 2012
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From: Atlanta, Georgia
I bought my bike from the dealer with Vance and Hines slip-ons and a stage 1 air cleaner kit. I later installed V&h dresser duals. I now wanted to get my bike dyno tuned and decided to also get TW 555 cams installed at the same time. Now my idle seems rough and erratic and my mpg is down from 40-42mpg to 31-33 mpg. The bike was tuned using a Screamin Eagle race tuner. I found a vacuum leak so I took the bike back to the tuner. He fixed the leak and it was put on the dyno again. Still the idle doesn't seem right to me but he says everything is good. Just wanted to see if there was anyone with a similar bike who has had the TW 555's installed and experienced the same issues.
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Stage IV
Joined: Aug 2014
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From: USA
I remember the tuner stating that the idle enrichment on start up was set to the lowest allowable value. I have a dyno sheet at home which I'll look at later. The tuner I used is a very reputable, well known guy from my area, recommended to me by many people. He told me that the Screamin Eagle race tuner would give me a much more personalized tune as opposed to a more generic tune from a power commander. Its been 20 years since I owned my last Harley and things have changed a bit since then so I trusted his opinion and the referral of him by others.
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Joined: Oct 2009
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From: Myrtle Beach SC
I have a TW555 cam in my 2013 Road King, Stage 1 with V&H Dresser duals and SuperTrapp FatShotz. I have the SE Pro Super Tuner, the "race tuner" hasn't existed for several years. The bike has a slight lope on idle but runs really really good. I get about 42 mpg hiway, 36 in the city. I personally would NOT put a power commander on any bike that has TBW, I've tried in a few and the throttle by wire bikes just didn't do as well as they did with a flash type tuner like the SEPST, TTS etc. They PCV was fine on my pre TBW bikes and "OK" on the newer ones but not like it should. Power Commanders are throttle position based tuners, TBW is Lambda based, it just works better with a flash tuner.
Last edited by Gunnysgt; Aug 8, 2014 at 03:31 PM.
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Stage IV
Joined: Aug 2014
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From: USA
Thanks Gunny, Your're right with the tuner. Mine is a super tuner also. I will be making a trip from Long Island NY to Maine next month. That should give me a good read on the mpg. My bike runs well also, the idle just seems a little funky. I'm a foreign car auto mechanic so I know quite a bit about fuel injection systems. If my bike was a car, I would say that it had a bad O2 sensor based on the idle fluctuation. Maybe its just me
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