New Vacuum Hose Mod - Kawasaki Versys Forum
Modifications - Performance Discuss aftermarket and DIY performance modifications
Sponsored by: LeoVince USA

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 372 (permalink) Old 07-05-2008, 11:58 PM Thread Starter
Member
 
invader's Avatar
 
Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Posts: 6,450
New Vacuum Hose Mod

I just tried out this new vacuum hose mod that smooths out the low end, which I got from the french Kawette forum: http://www.kawette.net/forum/viewtopic.php?t=19314
The IAP (Inlet Air Pressure) sensor has a hose on the left throttle body. The mod consists of a hose that connects both TB's at the carb synch fittings with the IAP hose coupled to the connector hose. This smooths out the IAP reading and balances out the vacuum pulse between the two TB's. Kawette forum got the idea from an Italian source, and they tried two other connecting methods with additional routes but with the same results... A smoother response at low rpm range without hiccups is noticed, as well as improved tractability, torque and throttle control. Some reported better fuel economy. Engine braking also seems to be reduced.
I really like the improvement so far.

UPDATE: (post # 134 on page 7) After noticing that the IAP sensor fitting bore is larger than the two TB vacuum access fittings, I tried connecting the left tube on the smaller vacuum access fitting instead of on the IAP fitting, still with a T and the right tube on the other TB's vacuum access fitting. I had to raise idle rpm back up and it ran very poorly and sounded erratic. I pulled over and quickly put it back like I had it with the left hose on the TB's IAP fitting... I then put the IAP hose back on its fitting and connected both TB's without the T. It's also known as configuration '1' in the french forum, as some have reverted to. It runs at least as well now as with the left hose on IAP fitting and a T like I had it. I'd like to try out configuration '2' now, as shown in second pic... I had enough 5/32" (3.83 mm) vacuum hose to replace the thin, slightly short and bent IAP 6 mm hose as well. I was able to do it all in a few minutes with a slim pair of needle nose pliers.

The best and most simple configuration #1, with a single 6" (15 cm) long 1/8 or 5/32" (3mm) ID vacuum hose on both TB vacuum ports. Leave the left outer IAP hose alone, and forget about using a T:

Attached Thumbnails
Click image for larger version

Name:	vaccum TB 001.jpg
Views:	3374
Size:	544.6 KB
ID:	342   Click image for larger version

Name:	config1.jpg
Views:	3030
Size:	957.5 KB
ID:	1120   Click image for larger version

Name:	config2.jpg
Views:	3414
Size:	903.8 KB
ID:	1126  

Last edited by invader; 05-01-2013 at 10:28 PM.
invader is offline  
Sponsored Links
Advertisement
 
post #2 of 372 (permalink) Old 07-06-2008, 12:46 AM
Member
 
Join Date: May 2008
Posts: 87
Geez, there are tons and tons of members at that forum! I can't read French enough for real comprehension, but certainly this question has been asked.

There has to be a reason why this wasn't done on the stock bike... maybe they thought the cost of carrying 3 lengths of hose vs. 1 and 1 t-junction was too high.

Furthermore, does any other bike (specifically : more expensive) have this sensor hose attached to more than one TB?
Muffler Bearing is offline  
post #3 of 372 (permalink) Old 07-06-2008, 01:08 AM Thread Starter
Member
 
invader's Avatar
 
Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Posts: 6,450
I've been wondering the same thing, and what effect coupling the TB's on a non-FI twin would have... Cars read IAP at the intake manifold which has all the intake inlets together on a common chamber.
This mod stabilizes the IAP signal, by reducing the vaccum pulse width and by doubling its frequency.
invader is offline  
post #4 of 372 (permalink) Old 07-06-2008, 09:24 AM
Super Moderator
 
Bear on a bicycle's Avatar
 
Join Date: Mar 2008
Location: Converse, Tx
Posts: 4,906
Hmmm... This is a mod I may have to try!
Bear on a bicycle is offline  
post #5 of 372 (permalink) Old 07-06-2008, 11:53 AM
Member
 
Hooligan's Avatar
 
Join Date: Mar 2008
Location: N. Georgia mountains
Posts: 459
Quote:
Originally Posted by invader View Post
I've been wondering the same thing, and what effect coupling the TB's on a non-FI twin would have...
I did it on my Triumph (T100) and it gave it better throttle response....

Graham

To do is to be. -Descartes
To be is to do. -Voltaire
Do be do be do. -Frank Sinatra

http://www.grahamcrosby.com

States I've ridden in so far
Hooligan is offline  
post #6 of 372 (permalink) Old 07-06-2008, 11:58 AM
Member
 
Join Date: Jun 2008
Location: Silverdale, Washington
Posts: 59
A quick question gents: What is blank plate with two bolts on it? It sits centerline of the valve cover between those two electrical connectors.

Red
Red Alert is offline  
post #7 of 372 (permalink) Old 07-06-2008, 04:15 PM
Member
 
Join Date: Jun 2008
Posts: 29
I think I'll give it a try too. Do the french have any other secrets that you've managed to crack??
Scarey is offline  
post #8 of 372 (permalink) Old 07-06-2008, 04:21 PM
Member
 
Join Date: Jun 2008
Posts: 29
Red alert, I think that the aluminum plate you see is Invader's PAIR valve block plate. It's another mod that will keep an aftermarket exhaust from popping on decelleration. It seals the port that usually gets air from the PAIR valve to keep it from entering the exhaust.

For more info try a search on the forum for PAIR valve.
Scarey is offline  
post #9 of 372 (permalink) Old 07-06-2008, 05:09 PM
Member
 
Join Date: Jun 2008
Location: NJ, US
Posts: 173
Invader -

Is that Tygon tubing you used?
heehaw is offline  
post #10 of 372 (permalink) Old 07-06-2008, 06:57 PM Thread Starter
Member
 
invader's Avatar
 
Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Posts: 6,450
No, it's nothing exotic... I just got one foot of available 1/8" (3mm) ID vinyl primer hose and a white plastic T from my Yamaha dealer. It works fine, but I'd like to get some nice silicon tubing.

PS: I then upgraded to 3/32" Goodyear vacuum tubing with a 3/32" T fitting.

Last edited by invader; 09-04-2008 at 03:11 AM.
invader is offline  
post #11 of 372 (permalink) Old 07-06-2008, 07:13 PM
Member
 
Join Date: Jul 2008
Posts: 3
Is the bike hard to work on?
fr96ss is offline  
post #12 of 372 (permalink) Old 07-06-2008, 07:42 PM Thread Starter
Member
 
invader's Avatar
 
Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Posts: 6,450
No, but for easy access, you just need to remove wind screen, fairing, seat, gas tank and airbox... Here it is as seen from the side... She is a smooth runner now, and it's well worth it.
Attached Thumbnails
Click image for larger version

Name:	vaccum tube 001.jpg
Views:	1920
Size:	547.8 KB
ID:	345   Click image for larger version

Name:	vaccum tube 002.jpg
Views:	1753
Size:	508.2 KB
ID:	346  

Last edited by invader; 07-06-2008 at 07:44 PM.
invader is offline  
post #13 of 372 (permalink) Old 07-06-2008, 08:55 PM
Member
 
Join Date: May 2008
Location: On the plains
Posts: 137
Quote:
Originally Posted by invader View Post
No, it's nothing exotic... I just got one foot of available 1/8" (3mm) ID vinyl primer hose and a white plastic T from my Yamaha dealer. It works fine, but I'd like to get some nice silicon tubing.
Silicone tubing will deteriorate on contact with gasoline and/or gasoline vapors...don't ask me how I know that! I know there shouldn't be liquid gasoline in these tubes, but when you shut the engine off, the vapor may creep up into them. There is a chemical resistance which also shows gasoline in contact with silicone as a "No" here:

http://www.watson-marlow.com/wmb-gb/p-chem-g.htm

You'd probably be best off just to use some regular automotive vacuum hose. It should handle any gas vapors fine, and it would color match with the original hose. Throw in a brass 'T' or 'Y' fitting if you want a really fancy and bullet proof set-up.

Corey
corey872 is offline  
post #14 of 372 (permalink) Old 07-07-2008, 02:34 AM Thread Starter
Member
 
invader's Avatar
 
Join Date: Mar 2008
Location: Kapuskasing Ontario Canada
Posts: 6,450
Thanks for the info on silicone tubing... A brass T fitting wasn't available then. The white 'plastic' one is light but fragile. Tygon tubing as used in RC is usually available in bright colors, but would be good and very flexible.
I'd like to try polyurethane tubing (available in transparent or opaque colors), also much better than regular rubber automotive vaccum hose with it's high resistance to oils, greases, fuels, vacuum, weathering, abrasion, tearing, pressure, impact, radiation, prolonged or frequent flexing, good tensile strength and high elastic memory. I could also upgrade the existing IAP sensor tube.

Last edited by invader; 07-07-2008 at 03:53 AM.
invader is offline  
post #15 of 372 (permalink) Old 07-07-2008, 06:54 PM
Member
 
Join Date: Jul 2008
Posts: 3
Thanks for the reply. I am contemplating picking up an 09 and i like to do all my own work.
fr96ss is offline  
post #16 of 372 (permalink) Old 07-07-2008, 07:18 PM
Member
 
Join Date: Jun 2008
Location: NJ, US
Posts: 173
I have a spool of the tygon stuff and have been using it for a long time on my gas RC planes, and while it is good, it does deteriorate (harden) and would certainly need to be replaced every two years or so.
heehaw is offline  
post #17 of 372 (permalink) Old 07-07-2008, 08:45 PM
Member
 
Join Date: May 2008
Location: On the plains
Posts: 137
Quote:
Originally Posted by heehaw View Post
I have a spool of the tygon stuff and have been using it for a long time on my gas RC planes, and while it is good, it does deteriorate (harden) and would certainly need to be replaced every two years or so.
Strangely enough, I used to use silicone for my 'gas' RC planes and cars...it seems to hold up well to the nitromethane, methanol and castor oil mix that they burned. But only lasted a few hours in gasoline! Go figure~!

Corey
corey872 is offline  
post #18 of 372 (permalink) Old 07-07-2008, 08:49 PM
Member
 
Join Date: Mar 2008
Location: Cumming, Ga.
Posts: 220
You never know what's in gasoline these days!!!

Bill
Versys
F650GSD
FLSTSCI
XR650L
Tri Scrambler
XR50
SRX600
Zuma 125
T100R
Aero 50
EZ90
PA50
States by MC
Bad-Tat is offline  
post #19 of 372 (permalink) Old 07-10-2008, 12:34 AM
Member
 
Join Date: May 2008
Location: Colorado Springs, Co.
Posts: 107
Did this mod on my V. today. After riding around about 200 miles, A couple of things I noticed. After getting my exhaust, I noticed it seemed to take a bit more throttle to get me going smoothly from a stop, and sometimes it did not go so smoothly!!! After doing this mod, she seems to pull away much cleaner and with less effort. Seems to be a little smoother at low speeds as well, not that this was ever a major issue. Kinda feels like she pulls a bit easier with given throttle application as well. Whether I have gained any hp, I can't say, but I assume torque has improved a bit down low due to the easier starting. My mileage last fill up today returned about 60 mpg, with a few wheelies and a top speed pull. I'll report on mileage again if it has improved with normal day to day running. The mod took about an hour to perform, very easy, and cost me about $5 in parts from local auto store-1.5 ft 1/8" vacuum tubing (of which I have about 10" left over), and one 5/32" (3.96mm) vacuum tee. Till then, here are a couple of pics of my install. Thanks a bunch, Invader, for the info!!!
Fukken cheers,
Erik!!!
Attached Thumbnails
Click image for larger version

Name:	IAP Mod 003.jpg
Views:	2561
Size:	209.9 KB
ID:	372   Click image for larger version

Name:	IAP Mod 011.jpg
Views:	1761
Size:	200.9 KB
ID:	373  

Last edited by Motodevil; 07-10-2008 at 12:37 AM.
Motodevil is offline  
post #20 of 372 (permalink) Old 07-10-2008, 07:06 AM
Member
 
Lukejt's Avatar
 
Join Date: Jun 2008
Location: Finksburg, Maryland
Posts: 425
I'm going to have to try this one out. I want some more wheelie power.
Lukejt is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Versys 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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