Go Back   Ducati Forum > Ducati Panigale Forum > Ducati V4

Ducati V4 Ducati Panigale V4 Forum - Ducati V4 Panigale Superbike Motorcycle Forum


Thanks Tree9Thanks
Reply
 
LinkBack Thread Tools Display Modes
Old Aug 13th 2019, 09:46 PM   #1
Junior Member
 
Jr51's Avatar
 
Joined: Mar 2014
From: Steinbach

Posts: 27
Thanks: 34

V4 instability

the V4 as shipped (i will assume all are shipped with same suspension setting, i have the S) has a very nose down geometry.., making for a very nervous and unstable feel (unless glassy smooth asphalt).. if you feel headshake or tank slapper tendencies more often than you'd like, then read on.. these 2 adjustments will stabilize this chassis.. (ps, im 175lbs plus gear, race only)

unless you are light, the front springs are super soft, if you are over 170lbs, set the preload to max settings (turn clockwise till stops..) if over 200lbs, maybe consider stiffer front springs..

the rear spring rate is about right for 170-200lbs, but to fix the nose down issue , soften the rear spring entirely., like back the ring nuts off until you cant anymore.. do these 2 things and the bike is transformed into a much more stable chassis ..

lowering the fork tubes and shortening rear shock length among other things is preferred (among the more advanced) but for the sake of ease and technical simplicity, this is a very simple easy way to make a very stable V4..

as you tension the front springs (raise the front)
and lessen the rear spring pressure (lower the rear)
the forks change in rake will increase trail for a stable front end..
the price you pay, is that corner turn in will be less quick..
Thanks from Phl, AndreiD and RdashP

Last edited by Jr51; Aug 15th 2019 at 08:30 PM.
Jr51 is offline  
 
Old Aug 14th 2019, 06:51 AM   #2
Senior Member
 
Joined: Mar 2018
From: Houston

Posts: 188
Thanks: 77

I Ride: 18 Panigale V4S, 17 Aprilia Tuono Factory
I agree on a lot of these points based on my experience.

I wouldn't necessarily call front springs as "super soft", but they are borderline for anyone who is moving. My 2018 V4S came with FL9460 serial number forks (you need to bend backwards to be able to see that stamp, but it is there facing the wheel). Ohlins USA came back with 10.5 spring rate for this serial number. Next up will be 11.

I kept adding preload on the front in 2 turn increments until I ended up with 6. Later I backed off to 5. I can't be sure on the maximum number of turns that can be put in, but I am personally not in favor on maxing stuff out (mechanically) in generally. I have been running "brake support" on maximum +5 though as I use Custom Dynamic mode.

On the rear I took out all the preload, but later on added 2 turns in from fully out. So I have been running with less pre-load on the rear than stock.

Just my exerience, and I am happy with the handling as times keep improving, so I am leaving it largely alone without drastic changes.

No issues with tire wear front or rear.

I am 165-170 lb, no gear, and run quicker pace than most in advance group.
Thanks from RdashP
thorny is offline  
Old Aug 14th 2019, 07:56 PM   #3
Senior Member
 
Joined: Feb 2017
From: USA

Posts: 116
Thanks: 10

So the 2018 V4S shipped with 1.05kg springs in the front? I thought all Ohlins Panigales shipped with 1kg springs.
rja4z3 is offline  
Old Aug 14th 2019, 07:58 PM   #4
Senior Member
 
Joined: Feb 2017
From: USA

Posts: 116
Thanks: 10

And any concern about damaging the spring during use by maxing out preload? Seems like preload adjustment is limited (so max isn’t actually max) in order to keep us from damaging the spring, but want y’alls opinion.
rja4z3 is offline  
Old Aug 15th 2019, 04:31 AM   #5
Senior Member
 
Joined: Mar 2018
From: Houston

Posts: 188
Thanks: 77

I Ride: 18 Panigale V4S, 17 Aprilia Tuono Factory
Originally Posted by rja4z3 View Post
So the 2018 V4S shipped with 1.05kg springs in the front? I thought all Ohlins Panigales shipped with 1kg springs.
They specifically asked for serial number on the fork to tell me what spring was installed. So who knows.
thorny is offline  
Old Aug 15th 2019, 08:26 PM   #6
Junior Member
 
Jr51's Avatar
 
Joined: Mar 2014
From: Steinbach

Posts: 27
Thanks: 34

rja4z3.., you cannot damage the springs no matter what you do.. unless you have an M1 Abrams..
Thanks from rja4z3
Jr51 is offline  
Old Aug 16th 2019, 05:06 AM   #7
Fry
Member
 
Fry's Avatar
 
Joined: Jun 2018
From: San Diego, CA

Posts: 33
Thanks: 23

I Ride: 2019 V4, 2018 V4S (crashed), 2016 BMW R1200GS (up for sale)
On my 2018 S, using fork serial number, Ohlins confirmed the 10.5 N/mm springs were installed stock.

For track use I turned fork preload to 13 turns and softened the shock preload by 4 turns and it made a huge difference in braking and acceleration stability. Prior to that, I used to lift the rear frequently on the brakes, and experience more rear tire pump and front head-shake on acceleration. Even still, I was bottoming the forks on max braking and ordered 11.5 fork springs, but never got a chance to have them installed. I'm 190 lbs with full gear and run A group pace.
Thanks from rja4z3 and thorny
Fry is offline  
Old Aug 19th 2019, 08:17 PM   #8
Senior Member
 
Joined: Feb 2017
From: USA

Posts: 116
Thanks: 10

Originally Posted by Fry View Post
On my 2018 S, using fork serial number, Ohlins confirmed the 10.5 N/mm springs were installed stock.

For track use I turned fork preload to 13 turns and softened the shock preload by 4 turns and it made a huge difference in braking and acceleration stability. Prior to that, I used to lift the rear frequently on the brakes, and experience more rear tire pump and front head-shake on acceleration. Even still, I was bottoming the forks on max braking and ordered 11.5 fork springs, but never got a chance to have them installed. I'm 190 lbs with full gear and run A group pace.
Are you running in dynamic DES mode or no? Also curious if anyone has a tutorial on replacing front fork springs on these. Seems like it would be more complicated than popping off the cap due to the electronics.
rja4z3 is offline  
Old Aug 20th 2019, 11:15 AM   #9
Senior Member
 
Joined: Feb 2017
From: USA

Posts: 116
Thanks: 10

Bumping this. Anyone with real race/track pace running Custom Dynamic DES or simply Custom Fixed?
rja4z3 is offline  
Old Aug 20th 2019, 08:46 PM   #10
Fry
Member
 
Fry's Avatar
 
Joined: Jun 2018
From: San Diego, CA

Posts: 33
Thanks: 23

I Ride: 2019 V4, 2018 V4S (crashed), 2016 BMW R1200GS (up for sale)
Originally Posted by rja4z3 View Post
Bumping this. Anyone with real race/track pace running Custom Dynamic DES or simply Custom Fixed?
I tired custom dynamic DES for 2 sessions on the track and didn't like it. So I used custom fixed damping ever since. It's more predictable in my opinion and felt better to me..
Thanks from rja4z3
Fry is offline  
Reply

  Ducati Forum > Ducati Panigale Forum > Ducati V4

Tags
instability



Thread Tools
Display Modes



Facebook Twitter Google+ RSS Feed