Senior Rotax Wet Setup Advice

Welcome to KartingForum.co.uk
Join our new Karting community and unlock all the benefits of being a registered member, it takes 2 minutes & it's FREE! See you trackside...

Find out more about membership HERE!
Log in - Register

Adam

Need help? Just ask!
Administrator
Founding Member
Karting Guardian
Registered Driver
Driver Joined
28/11/19
Posts
502
Reaction Score
154
Trophies Awarded
13
Age
29
Location
Essex - UK
Name
J 'Adam' Pell
Skill Level
Amateur
Class
Senior Rotax 177
Chassis
Tony Kart 401R
Team
J. A. Pell & Son Motorsport
Facebook
View
Instagram
View
Website
View
General setup: Rears all the way in? Fronts all the way out? Front torsion bar in, out? 3rd bearing in, out?

šŸ‘‡ Any advice on tyre pressures for wets (Mojo W5's) a'like please guys?

Official spec says 14psi cold? But I've heard anything from 20psi, 30psi etc?


@LeeAllonby @Team13Karting (Always gota tag Lee & Lee šŸ‘€)
 

Team13Karting

KartingForum.co.uk
Founding Member
Karting Guardian
Registered Driver
Driver Joined
13/12/19
Posts
49
Reaction Score
45
Trophies Awarded
9
Age
41
Location
Swindon
Class
Senior Rotax
Team
Team 13 Karting
How long is a piece of string? Definitely one of those things that needs testing to find out what works for you and your chassis. The Compkart has more front end than my Kosmic ever had so the setup for that would be different to an otk.

Basic idea is to get the rears in as much as you legally can, then have the fronts lining up with the middle of the rears. Added caster will assist with turn in. The thing you then need to do is balance the front and rear out. Too much rear grip will push the front on which some people mistake for understeer. Too much front will unsettle the rear leading to oversteer.

Tightening the axle through the third bearing, or tightening the rear bumper can help to settle the rear through the corner but again this is all stuff you'll need to test to see what works for you
.

The W5 is a good wet tyre, start around 15psi for wet and go up as the amount of standing water increases...
 
  • Like
Reactions: Adam

Adam

Need help? Just ask!
Administrator
Founding Member
Karting Guardian
Registered Driver
Driver Joined
28/11/19
Posts
502
Reaction Score
154
Trophies Awarded
13
Age
29
Location
Essex - UK
Name
J 'Adam' Pell
Skill Level
Amateur
Class
Senior Rotax 177
Chassis
Tony Kart 401R
Team
J. A. Pell & Son Motorsport
Facebook
View
Instagram
View
Website
View
How long is a piece of string? Definitely one of those things that needs testing to find out what works for you and your chassis. The Compkart has more front end than my Kosmic ever had so the setup for that would be different to an otk.

Basic idea is to get the rears in as much as you legally can, then have the fronts lining up with the middle of the rears. Added caster will assist with turn in. The thing you then need to do is balance the front and rear out. Too much rear grip will push the front on which some people mistake for understeer. Too much front will unsettle the rear leading to oversteer.

Tightening the axle through the third bearing, or tightening the rear bumper can help to settle the rear through the corner but again this is all stuff you'll need to test to see what works for you
.

The W5 is a good wet tyre, start around 15psi for wet and go up as the amount of standing water increases...
Thanks for the informative reply Lee! That gives me a great basline to start with and I can have a play from there.

Tyre wise a nice fella gifted me a set of worn in W5's so I know have a scrubbed in set to have a play with, just incase conditions are not....wet wet lol.

Did you ever use the longer front hubs with your OTK at all?
 

Team13Karting

KartingForum.co.uk
Founding Member
Karting Guardian
Registered Driver
Driver Joined
13/12/19
Posts
49
Reaction Score
45
Trophies Awarded
9
Age
41
Location
Swindon
Class
Senior Rotax
Team
Team 13 Karting
Thanks for the informative reply Lee! That gives me a great basline to start with and I can have a play from there.

Tyre wise a nice fella gifted me a set of worn in W5's so I know have a scrubbed in set to have a play with, just incase conditions are not....wet wet lol.

Did you ever use the longer front hubs with your OTK at all?
Yup, we'd generally have the wets on hubs ready to go so it was just then a case of removing the front and rear hubs and putting the wet hubs on. Speeds up the change a little...
 

Adam

Need help? Just ask!
Administrator
Founding Member
Karting Guardian
Registered Driver
Driver Joined
28/11/19
Posts
502
Reaction Score
154
Trophies Awarded
13
Age
29
Location
Essex - UK
Name
J 'Adam' Pell
Skill Level
Amateur
Class
Senior Rotax 177
Chassis
Tony Kart 401R
Team
J. A. Pell & Son Motorsport
Facebook
View
Instagram
View
Website
View
Yup, we'd generally have the wets on hubs ready to go so it was just then a case of removing the front and rear hubs and putting the wet hubs on. Speeds up the change a little...
So something I would definitely need to pop on my 'to get' list? As it seems standard length hubs and the front wheels spaced all the way out, is not enough?
 

Team13Karting

KartingForum.co.uk
Founding Member
Karting Guardian
Registered Driver
Driver Joined
13/12/19
Posts
49
Reaction Score
45
Trophies Awarded
9
Age
41
Location
Swindon
Class
Senior Rotax
Team
Team 13 Karting
So something I would definitely need to pop on my 'to get' list? As it seems standard length hubs and the front wheels spaced all the way out, is not enough?
You can do that, but it takes time. And if you're in a hurry, getting things changed over as quickly as possible is generally a good way to go....