Decel Snort, Snarl etc... - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 3 (permalink) Old 06-26-2019, 08:49 PM Thread Starter
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Decel Snort, Snarl etc...

Just trying to get familiar with my new (to me) 08' 1100 Custom, everything seems to run good, bike came with dealer installed Hypercharger, Yamaha slip-on's (sounds ok if a little raspy) and seller said that carb has been re-jetted for this set-up. there any way to minimize and/or eliminate the off throttle decel wild boar snarling?? There is no back firing present. Any help, advice or links appreciated

Thank's in advance!!

"There are seven day's in a week...someday isn't one of them"
08' Star 1100 Custom, Hypercharger, Viking Lamellar's, full Cobra Classic's...(still tinkering)
07' FZ1 Reflashed, GYTR pipe, stoopid fast
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post #2 of 3 (permalink) Old 06-26-2019, 09:06 PM
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Proper jetting with a hypercharger is really tough. There have been many here try and never get it just right. Issue is the faster you go the more air is injected into the engine. You can jet for highet speed, then at idle you will be very rich. Louder pipes will make the popping more noticeable. Good luck and if you find a magic setup please post as many here would love to see it.

2001 Vstar 1100 Classic (sold), Cobra Slash Cut full exhaust, Dropped 1 inch with lowering links, ORK, 4.5 inch handlebar risers, Ultimate passenger seat, Passenger pegs moved forward 4 inches, Handlebar clock, KN air filter, Viking saddlebags, Additional rear lighting
Loose nut "me" behind the bars
2006 Harley Electra Glide Ultra Classic
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post #3 of 3 (permalink) Old 06-26-2019, 09:21 PM
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most Vstar bikes will rumble and pop and sputter when you compression brake with the throttle all the way closed

try cracking it open just a bit, the bike will not slow down as fast, but it will usually quiet the exhaust

I think there have been some threads about people modifying the hypercharger air intake so its not so agressively ramming air into the carbs. As Les mentioned the problem is it works great for max hp, ie drag racing or running on the track, it will really increase the HP by forcing air into the carbs, which allows them to be jetted for more fuel

air pressure (force hitting the front of the bike) is exponential with speed. When you go twice as fast there is 4 times as much wind resistance hitting you - the way the hypercharger is designed it takes advantage of that at high speeds, but when you slow down the airflow into the carbs is not a straight linear curve, so the jetting that is awesome at 90mph is rich at 45mph, and very rich at 30...

The main jets and PM ports control the fuel flow at different throttle openings, but its still difficult to get a bike with a hypercharger to run well when you are puttering thru town or down your street to your driveway.

Its a similar situation to putting a 'wild' cam in the engine - it will be great at 5000 rpm, but it will idle like your spark plug wires are falling off.

if you search you should be able to find threads by others who have modified their hypercharger to back off the ram-air effect a bit, both on this forum, and on other bikes / engines (on other websites).

Its a great looking intake - some people buy them just for the appearance. In fact there was a guy here a year or so back, who bought a bike that had one, and he could not get it to run well.

Turns out the previous owner was just building bikes for shows - he put a hypercharger on the bike, and impressive looking custom exhaust, but never bothered to change the jets in the carbs to match, they were still the factory OEM jets, because he never actually rode the motorcycle.

Last edited by KCW; 06-26-2019 at 09:26 PM.
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