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Author Topic: Vance and Hines  (Read 757 times)

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Offline Bryannaerin

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Vance and Hines
« on: May 16, 2020, 09:16:55 pm »
Hello everyone,

I am new to this and have been trying to search this answer and can't seem to find it. I have a 2014 yahama bolt and I just purchased the vance and hines twin slash pipes and I am not sure if I have to go get my bike reprogrammed or re-tuned. I see you have to for a Harley but I don't see anything for a yamaha bolt. Thank you!



Offline DrM

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Re: Vance and Hines
« Reply #1 on: May 16, 2020, 10:05:16 pm »
Some aftermarket manufacturers recommend that you use their fuel controller or something similar.  Then there are those that say the bike's OEM ECU will automatically adjust for the changes in the exhaust or air intake (or both).  So how do you know?  The answer is that unless you put your bike on a dynamometer, you don't know if those aftermarket exhaust and air intake changes make any real improvement beyond your imagination. 

In my case, I have Cobra exhaust and air intake, and I have elected not to do any reprogramming or retuning -- and let the bike adjust itself (if it actually does that.)  As far as I can tell, the bike runs just fine with these modifications - for my ears and feel.

Offline kwlbrown

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Re: Vance and Hines
« Reply #2 on: May 17, 2020, 09:05:59 am »
I put the v&h twin slash on mine and ran if for the rest of the season without any reprogramming but there was ALOT of backfiring, gurgles and pops. I enjoy these kind of sounds but it would have been too much. As soon as you let off on the throttle at all it would pop and bang. I had always planned on getting a flash so it was only temporary for me, but I would not have been able to keep it like that permanently. I don't know if mechanically it is fine to leave it or not.  Ivans flash sorted all that out, it still made nice sounds on decel but the amount I liked not over the top annoying and embarrassing at points. With a full system like this you are likely going to want a FC or flash, and I think 9.5/10 you are going to hear get Ivan's flash on this forum.
« Last Edit: May 17, 2020, 09:15:02 am by kwlbrown »
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Offline asarms87

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Re: Vance and Hines
« Reply #3 on: May 17, 2020, 12:32:13 pm »
I put the v&h twin slash on mine and ran if for the rest of the season without any reprogramming but there was ALOT of backfiring, gurgles and pops. I enjoy these kind of sounds but it would have been too much. As soon as you let off on the throttle at all it would pop and bang. I had always planned on getting a flash so it was only temporary for me, but I would not have been able to keep it like that permanently. I don't know if mechanically it is fine to leave it or not.  Ivans flash sorted all that out, it still made nice sounds on decel but the amount I liked not over the top annoying and embarrassing at points. With a full system like this you are likely going to want a FC or flash, and I think 9.5/10 you are going to hear get Ivan's flash on this forum.

Exact same for me, if you have the Twin Slash you definitely want Ivan's flash.

Offline lunkhead

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Re: Vance and Hines
« Reply #4 on: May 18, 2020, 12:49:23 am »
Some aftermarket manufacturers recommend that you use their fuel controller or something similar.  Then there are those that say the bike's OEM ECU will automatically adjust for the changes in the exhaust or air intake (or both).  So how do you know?  The answer is that unless you put your bike on a dynamometer, you don't know if those aftermarket exhaust and air intake changes make any real improvement beyond your imagination. 

In my case, I have Cobra exhaust and air intake, and I have elected not to do any reprogramming or retuning -- and let the bike adjust itself (if it actually does that.)  As far as I can tell, the bike runs just fine with these modifications - for my ears and feel.

The system can only compensate a little. A stock Bolt runs about 10:1 AFR up top and with an open filter, that rich AFR goes lean to about 14:1. If the factory AFR was correct for the stock airbox, there'd be a big problem installing an open filter without adding extra fuel. The only thing that's keeping your bike from running too lean at WOT is because it was already way too rich from the factory. Even so, another 5% increase in fuel (to 13:1) has been shown to make the most power with a good open filter on every dyno run I've seen.
« Last Edit: May 18, 2020, 01:24:04 am by lunkhead »
C-SPƎC

Offline srinath

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Re: Vance and Hines
« Reply #5 on: May 18, 2020, 01:12:59 pm »
Lunk you may be the perfect person to ask this.
I believe K&N type filters are going to cause cylinder wear, basically because on my first GS500 the bike was using copious amounts of oil by the time it got to even 20K - well it used 1/2 qt between changes from 10K on up and I put K&N on it at 15K so it may already have been dealing with a missing few marbles for sure.

Anyway If I put on a K&N but put a nicely soaked in filter oil stocking - the thick thick thickest you can find double layered over its surface - would the thing allow for the super high richness to be just pleasantly rich ?

Cool.
Srinath.

Offline lunkhead

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Re: Vance and Hines
« Reply #6 on: May 18, 2020, 03:04:34 pm »
Srinath, a K&N needs the right oil and in the right amount to be most effective. Too much oil and air can't get thru. Too little or wrong type and more dirt gets thru. A paper filter's only drawback is the greater surface area required to match the flow rate of a smaller K&N which relies on relatively large pore size for good air flow.
C-SPƎC

Offline srinath

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Re: Vance and Hines
« Reply #7 on: May 18, 2020, 05:40:52 pm »
Oh, you're saying paper stock filter flows as much as K&N with the caveat being paper has more area - like I even care. I have been blowing out my paper ones well up till the 9K mark, but may need to wash em in gas and dry them soon.

Cool.
Srinath.

Offline lunkhead

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Re: Vance and Hines
« Reply #8 on: May 18, 2020, 06:43:24 pm »
I'm saying for the same size paper filter, a K&N will flow much better. The stock paper filter would need to be way bulkier to flow as well. Not impossible to do but nobody wants a big, ugly filter and most vehicles don't have room for one. Use K&N for making the most power and paper for longest engine life.
C-SPƎC

Offline srinath

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Re: Vance and Hines
« Reply #9 on: May 18, 2020, 08:12:30 pm »
I know - but if I encase K&N in a wet with K&N oil stocking - would that be better than stock for power and as good as stock for engine life ? I want to have the best of both LOL.

Cool.
Srinath.

Offline lunkhead

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Re: Vance and Hines
« Reply #10 on: May 18, 2020, 09:57:17 pm »
If you're referring to a rain sock, they're made to shed water and probably won't hold oil. Either way, you can't physically get fine filtering AND high flow in a small package.

I plan to use an automotive filter and modify the stock airbox base to accept it. It'll be huge so I need to plan carefully so there's ample leg room and an acceptable look.
C-SPƎC

Offline srinath

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Re: Vance and Hines
« Reply #11 on: May 19, 2020, 10:08:01 am »
No, not a rain sock. This is something I used on my GS and my eliminator. Take a women's stocking. The thickest one on the market. Better yet, use an old T shirt. Now that big K&N would mean you need to use a child size T shirt. Soak in K&N filter oil. Put it on and tie a string or something on the engine side and double it back over to the outside and put another string or something. You want the air entering the filter to pass through 2 layers of thick oil soaked cloth.
With a K&N pod a set of thick women's stocking works very well. If the thing is hidden, the knot etc you tie in it to keep it in place doesn't show. No idea if its cleaner or what it does for engine life. Or for flow. I jetted the GS the exact same way as I do with K&N without this on them.

Cool.
Srinath.

Offline lunkhead

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Re: Vance and Hines
« Reply #12 on: May 19, 2020, 01:02:43 pm »
TANSTAAFL.
C-SPƎC

Offline srinath

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Re: Vance and Hines
« Reply #13 on: May 19, 2020, 07:36:18 pm »
What is that ?
Cool.
Srinath.

Offline lunkhead

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Re: Vance and Hines
« Reply #14 on: May 20, 2020, 01:17:15 am »
Anything you do to get the same filtering as paper in the same size package is going to have the same (or more if not pleated) resistance. You have to increase filter size to get both fine filtering and good flow.
C-SPƎC