Dunlop Direzza 03G Hard Or Medium?

[ike]

Greetings

I have had a scout though the threads but can't find what I am looking for.

I live around 250k from Suzuka and will be going around once a month this year with some other locals from our workshop.

I want to run Direzza 03G H (hard) compound rather than R compound (medium) as track is far away and want them to last a bit

Questions are as I have to drive to the track and back on them (have street rims with Direzza 101's for street use.) whats the best track pressure and transit pressure for these tyres.

We do 30min x 3 sessions.

I was running 36-38 psi on Star specs (I only buy Dunlops best bang for my Yen)

Any help most appreciated.

[Simonster]

Hi Mike,

I use the 03G hard on the sprint track at Queensland raceway. I also drive on the to and from the track (about 40km) I do this around 5-6 times a year however sessions are much shorter around 6 minutes with laps under the 60second mark. The tyres last me all year.

Pressure, the 3G's like 30-32psi hot so start with whatever you need for them to come up to this. I suspect 30 minutes of racing you'll need to start them pretty soft but id only be guessing but 22 might be a good start. I have different starting pressure for each tyre to suit QR, the lowest is 23 and highest is 28. So that should give you some idea.

Start with 22 and come in after say 5 laps as they should be stabilised by then ad make sure you have a temp probe or gun and change the camber accordingly.

Hope that helps?

[ike]

Hi Mike,

I use the 03G hard on the sprint track at Queensland raceway. I also drive on the to and from the track (about 40km) I do this around 5-6 times a year however sessions are much shorter around 6 minutes with laps under the 60second mark. The tyres last me all year.

Pressure, the 3G's like 30-32psi hot so start with whatever you need for them to come up to this. I suspect 30 minutes of racing you'll need to start them pretty soft but id only be guessing but 22 might be a good start. I have different starting pressure for each tyre to suit QR, the lowest is 23 and highest is 28. So that should give you some idea.

Start with 22 and come in after say 5 laps as they should be stabilised by then ad make sure you have a temp probe or gun and change the camber accordingly.

Hope that helps?

Thanks for your advice Simonster.

I did not think you would run them that low initially for fear of rolling them of the rim but they have a rigid side wall I guess.

What sort of camber do you run?

I will get an infrared gun for sure.

Thanks once again.

[Simonster]

Thanks for your advice Simonster.

I did not think you would run them that low initially for fear of rolling them of the rim but they have a rigid side wall I guess.

The sidewalls are very stiff compared to a road tyre, so no issue. I really swerve from side to side on the out lap to generate some heat, i did the same thing each time and my pressures are always spot on at the end of a run.

I suspect suzuka would be similar as far as camber goes but if you're in a GTR you may need a bit more on the front, but the temp will tell you.Also if you can't get it to turn toe the rear out at least 1mm each side this will help it point and get to the apex if you have done everything else and she's still understeering. This way you can keep some sensible camber on the front which will help with braking.

What sort of camber do you run?

-3.5 on the front -2 on the rear. but that's what i need to run to get and even temp on the tyre face for that track. It will be different at different tracks

Hope it goes well!!

Edited April 1, 2011 by Simonster

[Beer Baron]

suzuka is a great track. if you are not too worried about outright times, go the hards but the mediums will definitely give faster times. also depends what time of the year you are there. it's pretty cold in winter/autumn so if you're going in the cold months you may find the hards don't get enough heat into them to be useful in which case again you'll want mediums.

for transit to and from the track I would run around 34psi. on the track somewhere between 30 and 34psi hot will be what works. need a bit of experimentation to see what works for you. depending on ambient and track temps the tyres will come up by different pressures. maybe start with 25-26psi first, do 2 flying laps them come in and check the pressures. yes temp across the tyre is important, try to get it as even as possible. the infra-red heat guns are ok, but for type temps are probe is much better.

most of all, have fun. Suzuka is one of the best tracks in the world, quite fast but also quite technical and challenging. I know quite a few guys in that area (people from Voltex suzuka). it's a nice place. Hopefully you get to do the full track layout, the short layout is ok, but not the same.

[ike]

suzuka is a great track. if you are not too worried about outright times, go the hards but the mediums will definitely give faster times. also depends what time of the year you are there. it's pretty cold in winter/autumn so if you're going in the cold months you may find the hards don't get enough heat into them to be useful in which case again you'll want mediums.

for transit to and from the track I would run around 34psi. on the track somewhere between 30 and 34psi hot will be what works. need a bit of experimentation to see what works for you. depending on ambient and track temps the tyres will come up by different pressures. maybe start with 25-26psi first, do 2 flying laps them come in and check the pressures. yes temp across the tyre is important, try to get it as even as possible. the infra-red heat guns are ok, but for type temps are probe is much better.

most of all, have fun. Suzuka is one of the best tracks in the world, quite fast but also quite technical and challenging. I know quite a few guys in that area (people from Voltex suzuka). it's a nice place. Hopefully you get to do the full track layout, the short layout is ok, but not the same.

[ike]

The sidewalls are very stiff compared to a road tyre, so no issue. I really swerve from side to side on the out lap to generate some heat, i did the same thing each time and my pressures are always spot on at the end of a run.

I suspect suzuka would be similar as far as camber goes but if you're in a GTR you may need a bit more on the front, but the temp will tell you.Also if you can't get it to turn toe the rear out at least 1mm each side this will help it point and get to the apex if you have done everything else and she's still understeering. This way you can keep some sensible camber on the front which will help with braking.

-3.5 on the front -2 on the rear. but that's what i need to run to get and even temp on the tyre face for that track. It will be different at different tracks

Hope it goes well!!

Simonster thanks for all the great tips and advice I will put it to good use.

suzuka is a great track. if you are not too worried about outright times, go the hards but the mediums will definitely give faster times. also depends what time of the year you are there. it's pretty cold in winter/autumn so if you're going in the cold months you may find the hards don't get enough heat into them to be useful in which case again you'll want mediums.

for transit to and from the track I would run around 34psi. on the track somewhere between 30 and 34psi hot will be what works. need a bit of experimentation to see what works for you. depending on ambient and track temps the tyres will come up by different pressures. maybe start with 25-26psi first, do 2 flying laps them come in and check the pressures. yes temp across the tyre is important, try to get it as even as possible. the infra-red heat guns are ok, but for type temps are probe is much better.

most of all, have fun. Suzuka is one of the best tracks in the world, quite fast but also quite technical and challenging. I know quite a few guys in that area (people from Voltex suzuka). it's a nice place. Hopefully you get to do the full track layout, the short layout is ok, but not the same.

Thanks Beer Baron, My car can go a lot faster than I can drive it at this stage. So am just out to try and improve my er lack of skills... I had thought about the mediums but did not want to wear them out driving to and from the track. Going there in June but have a few runs planned in August and September also . Probably hard is best.

Its the full 5K track and its gonna be a great day.

[ike]

Some friends recommended the new Potenza RE11S rs compound so I ended up buying them instead.

Unreal tyre. good price ..well over here anyway.

[Simonster]

nice work- how are your times going???