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Post by davidsera on Aug 17, 2011 1:03:47 GMT -5
It is imperative that your tyres do not overheat during a race, as they will lose grip and you will lose speed We recommend that you ‘Hot Pressure’ your tyres at the end of each session (i.e check the tyre pressure immediately at the end of a session) then adjust all of the tyres to the working hot pressure. Below is an approximate cold & hot pressure guide. For specifics, contact your local dealer.
'Open' Tyres - Cold 9-10 PSI - Hot 13 PSI 'SL' Type Tyres - Cold 12-14 PSI - Hot 15-16 PSI 'Low Grip SL' Tyres - Cold 22-24 PSI - Hot 26-27 PSI
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Post by jimmy24 on Oct 9, 2011 16:20:08 GMT -5
hey dave what would you recomend for the new mojos as we are running the new x1 for our son josh in jmax . cheers dave first time arrows user
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Post by davidsera on Oct 9, 2011 17:11:02 GMT -5
Hi Jimmy,
The Mojo rubber doesn't have as much grip as some other tyres, so we tend to use between 13-14.5 as starting cold pressure. This is determined by how many lap races we compete in, and also grip levels.
In the past 12 months, we haven't had much luck running outside of that window.
Hope this helps
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Post by Pitbull on Nov 1, 2011 3:37:02 GMT -5
Hi Dave,
I race a ARROW X1 shifter kart with MG yellows on a rough car park surface with Nitrogen with Douglas Magnesium wheels on a soft axle and 54.5 inches rear width with 5 lines in the front. Minimum caster and 1 mm toe out per side with 1 mm negative camber per side without driver. Chassis set in the middle center of gravity.
Would you consider MG yellow tires as Open tires ?
Do you check your tire temperatures after each race or just the tire pressures ?
What should be the final tire target temperature reading for each tire after 12 laps for the front and rear tires.
We race in two different directions on the same track.
What tires pressure should I start out with on MG yellows when the track directions has more right hand corners based on clockwise direction then next event in anticlockwise direction.
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Post by davidsera on Nov 1, 2011 20:24:45 GMT -5
Hi Mate,
We use normal compressed air and not nitrogen so you may need to go a little lower in the pressures to compensate. Maybe only 0.5 should be the difference.
Don't do much in the way of tyre temperatures, just the pressures before and after each session. Normally aim to have the tyres increase 2.5 psi for MG Yellow as they are quite a sticky tyre.
In regards to setting tyre pressures, try having the drive side 0.5 lower than the other side so when they come in the pressures are all the same. Stagger them until you find the right combination.
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Post by Pitbull on Nov 2, 2011 17:13:39 GMT -5
Thanks Dave.
What is the best tire pressures technique to use for tire managment when going for qualifying runs to get a good qualifying time with the MG yellows.
Would it be better to run a higher tire temperature say between 10-10.5 psi instead of around 9 on MG yellows with the nitrogen and just make 2 quick laps to qualify on the grid and save the tires for the 3 race event.
When the MG tire comes back with scratched lines or patches of excess rubber sticked to them what should be done ?
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Post by davidsera on Nov 2, 2011 18:57:17 GMT -5
We would normally only increase pressure by 0.5 at most, as the new tyre will give maximum grip over the first 2-3 laps.
I would only recommend doing around 3-5 laps at most, as the tyre drops away from there.
If you are seeing scratched lines in the front tyres, then it is too high front pressure, as the front end is pushing. Try widening front track to combat this problem also.
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Post by Pitbull on Nov 3, 2011 1:59:21 GMT -5
Ok !
What to do if the rear tire comes back in with the same scratched lines like the front. Should I widen the rear also.
What to do if the front tires and back tires comes back in with pieces of rubber patches or rubber beads stuck to the contact patch face section of the tires in the front and rear.
Do you normally do a heat cycle on your new MG Yellow tires before the qualifying session by going out and just making about 3 laps at normal driving pace making sure not to scrub the tires in the corners and then allow the tires to cool down.
I was told to always allows the tire to cure after a few laps of normal driving pace to avoid any kind of distortion or scorching to avoid any damage to the tires before going back out to qualify for an event and then racing.
If this is not true should I just go out with my qualifying tires brand new and make about 3 full laps immediately and then pull off the track and not have to worry about scorching or any damaged which can ruin the brand new tires.
What is the tire sign to look for when the tire pressure is being run to low.
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Post by davidsera on Nov 3, 2011 19:40:51 GMT -5
What to do if the rear tire comes back in with the same scratched lines like the front. Should I widen the rear also. Yes. I would look at losing rear grip from the kart also.
What to do if the front tires and back tires comes back in with pieces of rubber patches or rubber beads stuck to the contact patch face section of the tires in the front and rear. Not real sure what you mean by this, but it almost sounds like you are driving off the racing line as you enter the pits, and your tyres are picking up excess rubber.
Do you normally do a heat cycle on your new MG Yellow tires before the qualifying session by going out and just making about 3 laps at normal driving pace making sure not to scrub the tires in the corners and then allow the tires to cool down. No. We always go out with brand new tyres fitted to the kart for qualifying with MG Yellows.
I was told to always allows the tire to cure after a few laps of normal driving pace to avoid any kind of distortion or scorching to avoid any damage to the tires before going back out to qualify for an event and then racing.
If this is not true should I just go out with my qualifying tires brand new and make about 3 full laps immediately and then pull off the track and not have to worry about scorching or any damaged which can ruin the brand new tires. The first 3/4 laps on MG Yellows are when they are their prime, so make the most of out those laps.
What is the tire sign to look for when the tire pressure is being run to low. You will almost feel the tyre peel off the beads as they roll quite a lot off the rim. Its almost in a bounce, but a different kind of bounce to too much grip. Hard to explain
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Post by Pitbull on Nov 7, 2011 13:11:43 GMT -5
Dave,
What would be the best tire pressure management set up to use for racing in the rain events.
What is the best racing tire to use if they did not have a rule against which tire can be used.
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Post by davidsera on Nov 8, 2011 17:41:49 GMT -5
For MG Whites we tend to use around the 16-20 psi range.
I have had experience on MOJO, MG White, and Dunlop wets, and I feel as though the MG White is the best.
There would be much softer compunds than what I have used though.
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Post by Pitbull on Nov 9, 2011 17:40:10 GMT -5
How would you rate the Bridgestone tires for the wet conditions against MG white.
Would you agree the MG yellows tires is a better tire in the dry conditions for the Rotax Masters or International class in the dry conditions.
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Post by Pitbull on Nov 9, 2011 17:44:30 GMT -5
I was wondering if the MG yellows is better than the Mojos for Rotax and masters class in dry conditions.
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Post by davidsera on Nov 10, 2011 18:46:05 GMT -5
Bridgestone are better wets than a MG White, but they are quite a lot softer, and wear out faster. They will be extremely fast in torrential rain, but on a drying track you will be in trouble.
MG Yellow has the potential to have too much grip for a Rotax engine. The soft tyre could slow the engine down on tighter corners, but it isnt something we have done too much testing around.
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Post by Pitbull on Mar 6, 2013 11:27:40 GMT -5
Dave all the best for the new year.
How can I check my arrow chasiss to detect if my Arrow X1 shifter it is slightly bent.
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