setting firmness on rear shock when drag racing - discuss. - Sportbike Forum: Sportbike Motorcycle Forums
 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 08-18-2003, 04:54 AM Thread Starter
Registered User
 
smokinHawk's Avatar
 
Join Date: Jun 2002
Location: Greenville, OH, USA 45331
Posts: 102
Arrow setting firmness on rear shock when drag racing - discuss.

Ok i have heard you should set you rear spring to soft when drag racing to acheve better traction and get better 60's
well i attempted it last friday.
results were very poor
on my first run on adjustiong the spring i was bouncing very bad. i couldnt tell if i was wheeling or just bouncing with the suspension. 60' was a 2.0, ran a 12
next time i set it one past full hard, results were similar i felt my rear was bouncing to much. i also noticed traction on the track was bad as my rear tire would slip.
60' was still a 2.0, ran a 12
i then adjusted 2 above full soft. felt a little more stready but was countiually slinding out with the rear tire. 60' was a 2.0 again. ran a 12
a adjusted it back to where i ride it on the street: 3 above full soft. got a desent launch, slipping alitte but pulled a 1.9 and got an 11.
i kept it that way and pulled 11's all night with my lowest a [email protected] (weather was very hot and humid)

next day i figured maybe i need to get some practice with the suspension softer. so i set it to 1 above full soft, rode it around for a while then practiced some launches on the street.. started to get used to it. my last launch was the best were i felt i got off hard and the front wheel pulled an inch of the ground for a second, and then kept it down, pulling hard. going by the butt dyno it flet like a good 60' but have no idea on what it was, for it could have been a 2.1-1.8?

comments??

03 Yamaha YZF-R6 - [email protected] (1.85 60')
96 Kawasaki ninja ZX-6R - [email protected] (2.09 60')
99 TurboTransAm - 512/536, [email protected] (2.06 60')
smokinHawk is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 08-19-2003, 05:50 PM
Registered User
 
Jammin_Johnny's Avatar
 
Join Date: Mar 2002
Location: Fontana, California USA 92335
Posts: 530
Send a message via Yahoo to Jammin_Johnny
Lightbulb

There are three adjustments that must be worked together.

Spring Preload : about 80% of full hard

Rebound Dampening : about 25% - 40% of full hard (soft range)

Compression : about 50% - 85%

These numbers are those to begin from. These are not "absolute" adjustments. Many factors go into having the ride set-up correctly. Some factors include:

1) Rider weight (w/ equipment)
2) Tire condition, compound & pressure
3) Launch control

It may take more than 12 passes before it remotely feels "correct". Once the ride's suspension is "dialed"........It'll launch like it is on rails (providing proper clutch actuation).

Hope This Helps!


Team No Limit Racing Inc.
http://www.2wheelpowerhour.com

JOHN BURR CYCLES, DYNAMIC POWDER COATING, WIDEOPEN CYCLE SERVICE, MOTUL, WEB CAM INC, ZERO GRAVITY, FLO-COMMANDER, AFAM, SIDI, PIRELLI/CRS, LP RACING.......
Jammin_Johnny is offline  
post #3 of 4 (permalink) Old 09-12-2003, 10:23 AM Thread Starter
Registered User
 
smokinHawk's Avatar
 
Join Date: Jun 2002
Location: Greenville, OH, USA 45331
Posts: 102
If i adjust the spring firmer will i less likely to wheelie?
it seems that way.

03 Yamaha YZF-R6 - [email protected] (1.85 60')
96 Kawasaki ninja ZX-6R - [email protected] (2.09 60')
99 TurboTransAm - 512/536, [email protected] (2.06 60')
smokinHawk is offline  
 
post #4 of 4 (permalink) Old 09-12-2003, 09:07 PM
Registered User
 
Jammin_Johnny's Avatar
 
Join Date: Mar 2002
Location: Fontana, California USA 92335
Posts: 530
Send a message via Yahoo to Jammin_Johnny
Exclamation

YES.........But not 1 adjustment will solve this issue.

Remember, you have "Rebound" and "Compression" seetings that MUST be in concert with the spring "Preload" setting.

Moreover, the "functioning geometry" of the machine MUST also be in concert with the shock settings. For example (only an example):

Spring Preload = 1.95" OR 65% FULL PRELOAD (OR MORE)
Rebound = 13 of 26 OR 50% FULL REBOUND
Compression = 5 of 8 OR 62.5% FULL COMPRESSION

Rake = OEM (23.5*) STRAPPED w/ 2.125" of CLEARANCE
Trail = OEM reduced to -2* (Pivot below Rear Axle)

Chain Length = 85% of maximum adjustment (monitor frequently)


Hope This Helps!


Team No Limit Racing Inc.
http://www.2wheelpowerhour.com

JOHN BURR CYCLES, DYNAMIC POWDER COATING, WIDEOPEN CYCLE SERVICE, MOTUL, WEB CAM INC, ZERO GRAVITY, FLO-COMMANDER, AFAM, SIDI, PIRELLI/CRS, LP RACING.......
Jammin_Johnny is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Sportbike Forum: Sportbike Motorcycle Forums 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 post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
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