Any Carb guru's??? - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
 10Likes
  • 1 Post By percy072
  • 2 Post By KCW
  • 1 Post By percy072
  • 2 Post By lesblank
  • 1 Post By Keith Post
  • 3 Post By percy072
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 08-23-2019, 02:30 PM Thread Starter
Junior Member
 
percy072's Avatar
 
Join Date: Jun 2019
Posts: 9
Garage
Any Carb guru's???

A little history...08 1100 with Hypercharger and new full Cobra exhaust. Just re-jetted to 120 main rear, 122.5 front, #20 pilot's, 3 turns out PMS, 2 shims on each needles and Emulsifier mod. Ok...just did a dyno run and it is showing the front cylinder is pretty lean at lower RPM then goes rich at higher RPM, rear cylinder seems relatively consistent. I'm new to messing with carbs so wanted to ask if might work to go bigger on the pilot to correct for lean condition at lower RPM then reduce main for rich condition at higher and leave rear cylinder as is??
Deeksvstarclassic likes this.

"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
percy072 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 08-23-2019, 02:33 PM
KCW
Senior Member
 
Join Date: Sep 2016
Posts: 5,087
Garage
the hypercharger is a ram air intake

unless you have 100 mph air hitting the front of it on the dyno, its not going to run the same as it will on the road

and its known for being difficult to tune for low rpm, its designed for racing at high speed
KCW is offline  
post #3 of 6 (permalink) Old 08-23-2019, 02:41 PM Thread Starter
Junior Member
 
percy072's Avatar
 
Join Date: Jun 2019
Posts: 9
Garage
Quote:
Originally Posted by KCW View Post
the hypercharger is a ram air intake
Good point!! didn't think of that. Overall the bike is running better post re-jet incl. smoother shifting, no decel pop etc etc, I'm just thinking if it seems to be an improvement then leave alone. I was just curious to see what it would show on a dyno and this "issue" with the front cylinder showed on the graph
Keith Post likes this.

"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
percy072 is offline  
Sponsored Links
Advertisement
 
post #4 of 6 (permalink) Old 08-23-2019, 03:10 PM
Moderator
 
lesblank's Avatar
 
Join Date: Jan 2014
Location: Houston, Texas
Posts: 4,019
Garage
Here's some info on hyper chargers and dyno tuning.

First of all let's stop to consider the fact that it is a RAM AIR INDUCTION device. If you try to tune the thing on a Dyno, you will get miserable results, unless you Dyno is in a wind tunnel. Short of that you would need to in some way provide accelerated airflow to the Hypercharger inlet, at a velocity that would match the speed you want to tune it for. The fact is, you really canít use this method as static Dyno tests will only give you a fairly clear picture of the HP and Torque of a bike that is not going anywhere, but just spinning the hell out of it's drive train with an artificial load on the drive wheel.

Follow this link for more info, about half way down.
https://sites.google.com/site/vstar1...-modifications

The hyper charger is more of a cosmetic item rather than a performance item. If you can get it set close, call it done.

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

https://sites.google.com/site/vstar1100kb/home
lesblank is online now  
post #5 of 6 (permalink) Old 08-23-2019, 03:52 PM
Moderator
 
Keith Post's Avatar
 
Join Date: Jul 2013
Posts: 5,798
Garage
I have to agree with the other members, if you thrifty the principle behind it, itís kind of similar to the ram they used on muscle cars back in the day. Before I relocated to East Tennessee I had a buddy that bought one for his bike. He couldnít get it to idle smoothly, he changed it out for an open air filter kit and it purred like a kitten.


Sent from my iPhone using Tapatalk
Deeksvstarclassic likes this.
Keith Post is online now  
post #6 of 6 (permalink) Old 08-23-2019, 09:57 PM Thread Starter
Junior Member
 
percy072's Avatar
 
Join Date: Jun 2019
Posts: 9
Garage
Quote:
Originally Posted by Keith Post View Post
He couldn’t get it to idle smoothly, he changed it out for an open air filter kit and it purred like a kitten.
I am finding the idle is not as smooth, also cold starting is a little more "finiky" but acceleration and on highway performance is better with 0 decel pop. The Hypercharger was on the bike when I bought it but now having been educated on it's issue's...I am tempted to switch to a pod set up. Also wishing I asked before spending $$ on the dyno lol...but at least I know it pumps out a whopping 53hp

"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
percy072 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome