TD3 Tyre Talk

**Gixxer 4 ever** · 23rd May 2006, 16:05

here
http://www.kiwibiker.co.nz/forums/sh...ad.php?t=23886

**Warr** · 23rd May 2006, 16:24

Not running the HP that your <2K bikes are putting out..
Session 2 was the only one I got times for and was running 1.28's
Running Diablo Stradas and they went sweet.
Trackday 1 at Manfield was the only other I have done and running just the Diablo on my '84 XJ900 the rear was showing lots of use.
Was a warmer time of the year tho too.

**Fatjim** · 23rd May 2006, 17:10

Originally Posted by MSTRS

I guess the trainer wheels don't help the lean angle either

This from a "man" who wouldn't go out on the track without his missus on the back.

Training wheels beat a handbrake any day!

**MSTRS:Me** · 23rd May 2006, 17:46

Originally Posted by Fatjim

This from a "man" who wouldn't go out on the track without his missus on the back.

Training wheels beat a handbrake any day!

*splutters coffee all over monitor*
Oh Jim??? What will you do when 'she' reads this??
It won't be pretty

**jimbo600** · 23rd May 2006, 17:53

Originally Posted by Two Smoker

Its the squatting that causes the wear... If the suspension is soft, the rear end squats down, and it cant do the work thats being asked of it... Having the preload cranked up abit means that there has to be a bigger more harsh bump before the shock compresses meaning the bike doesnt squat as much.

A tyre with a higher pressure results in a slower warm up temp, but also a slower cooling temp... The higher pressure also means that the carcass is less likely to squash due to the rear shock squshing as well...

You will get a similar response from Shaun, but his will be in more detail and easier to understand...

Preload affects sag. Harden the suspenders with upping rebound and compression adjustment. I upped both on the rear and got a less squat and wallow but still experienced tyre shredding and blistering on OEM BT014s. More air in the tyre keeps it cooler according to Metzeler techs and they know their shit.

**madboy** · 23rd May 2006, 18:00

Can't talk for Taupo, but if Skelstars talking takas... I find the scuffing up of the tyre happens most when I'm abusing the throttle out of corners. I can ride at the same corner speed but with less violent throttle use on exit and you'd barely notice the tyre had been touched.

But that's probably why I can't keep up with the big boys like Jimbo over the takas... And with the short time it takes over the takas you'd get no where near the same heat into the tyres as you would circulating around a race track constantly on or very near the limit for XX minutes.

**Karma** · 23rd May 2006, 18:07

I was running pilot roads, and not really going that fast in comparison to others, but they've hardly got a mark on them.

**Two Smoker** · 23rd May 2006, 18:12

Originally Posted by jimbo600

Preload affects sag. Harden the suspenders with upping rebound and compression adjustment. I upped both on the rear and got a less squat and wallow but still experienced tyre shredding and blistering on OEM BT014s. More air in the tyre keeps it cooler according to Metzeler techs and they know their shit.

By upping the preload, it is a quick fix for a shock that is too soft... By upping the preload you change the point at which the spring compresses... The best solution is to put in a new heavy (or harder) spring which changes the spring rate....

ie you can have a soft spring with the preload wound right up to get good sag, or a hard spring with little preload to get good sag...

Compression dampening will change the rate at which the spring is compressed, but there is only so far you can go...

As for tyre temp... meh, i was losing the leading edge and getting feathering on my SC0 front at 30psi... upped it to 33psi, and it no longer had that feathering...

Also BT014 isnt the best track tyre, especially with the way you ride... It was most likely over heating resulting in the blistering... Cold tear is a "old" term, it doesnt mean that it is being torn up because the tyre is cold....

Plus i know shit all, but i am trying to learn and experience different adjustments...

**Fluffy Cat** · 23rd May 2006, 18:14

Ok dont know if this helps but here goes.
This was my second outing at Taupo same tyre types both times Diablo slicks, sc1 front, sc2 rear.
Bike is a stripped down FZR400sp so weight might be around 150kgs
Rider and gear 100kgs.
Front 28psi
Rear 30psi
First trackday was the recent Rodders day. A lot of time on the track and a very ripped up front and not to bad on the rear but not quite there to much wear for this small bike.
Others on the day similar bikes same tyres same wear some said it was cold shear. I was not using tyre warmers but was doing 2 warmup laps each session so not pushing to hard to start. Was using shot suspension with wrong spring rates. The rear was blown.

This track day all new suspension from hyperpro, not everyones cup of tea but better than before.
Front 30psi
Rear 30psi
Did the same warming up and this time much better wear. The front needed some attention as was a bit choppy on the bends into the straight so very slowly reduced the front comp damping and took a turn off the preload(was running on almost no preload). This improved control heaps on the front but the back end was very slightly choppy on comp so one click back. This was using those same bends and bumps as a marker. Much improved Hyperpro seemed to have set the rear shock up almost spot on for me that day.
But the front was still not right so 2 more clicks off the front comp. Better but the biggest prob of the day was front end chatter braking into those same bends off the back straight and, at the end of the front straight. This was causing me to be much gentler on the brakes than i like.
I think the front prob is the air spring and will take out some oil for the next practice session.
I think a lot of the cold shear prob is in fact poor suspension set up that could be fixed with better set up. It has been a bit of trial and error on the front end as the hyperpro springs are for the FZR400rr which has no adjustment so the given oil heights are prob off. Though the new springs and different weight oil 15 weight instead of 10 made the rebound and comp adjustments work, as before they had verry limited actions. Also need to sort out a fueling glitch on the long left hander so will go up from 115 to 120s and see what that does.
Looking forward to my next practice at Puke......

**Two Smoker** · 23rd May 2006, 18:19

Originally Posted by Fluffy Cat

Looking forward to my next practice at Puke......

Come along on the third of June.. ill be pottering around...

**Fluffy Cat** · 23rd May 2006, 18:21

Sounds good to me will be there if not doing the work thing. Might even have the RS going again.

**jimbo600** · 23rd May 2006, 18:27

Originally Posted by Two Smoker

By upping the preload, it is a quick fix for a shock that is too soft... By upping the preload you change the point at which the spring compresses... The best solution is to put in a new heavy (or harder) spring which changes the spring rate....

ie you can have a soft spring with the preload wound right up to get good sag, or a hard spring with little preload to get good sag...

Compression dampening will change the rate at which the spring is compressed, but there is only so far you can go...

As for tyre temp... meh, i was losing the leading edge and getting feathering on my SC0 front at 30psi... upped it to 33psi, and it no longer had that feathering...

Also BT014 isnt the best track tyre, especially with the way you ride... It was most likely over heating resulting in the blistering... Cold tear is a "old" term, it doesnt mean that it is being torn up because the tyre is cold....

Plus i know shit all, but i am trying to learn and experience different adjustments...

Yeah I know about the BT014 but its OEM on the bike and I aint got funds to bin em and replace them with proper tyres so I have to suck it up. New BT014s are better than the old ones though I have to say.

I find that Air from Shell is much more grippy than air from BP what about you?

**The Stranger:Me** · 23rd May 2006, 18:55

Was running a Michelin macadam on the rear.
and a pilot power on the front.

What a deadly combination.
Seriously deadly.

First time I have seen a tyre polished to a really smooth, high gloss finish by tar seal. You just know you are going to get high milage.

Um does it count as getting your knee down if the bike follows your knee on down?