Any Rennlisters from New Zealand?
#3122
Rennlist Member
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Lastly, many say these courses are easier and faster in a 2WD vs a 4WD due to less under-steer and the ability to modulate the rear attitude of the car via the throttle pedal with better modulation. I would be surprised if you were faster in the 4WD 996TT than the 964T. The challenge with the 964T will be keeping the car smooth as the boost will try and upset things. Also you have factory shocks I believe that are 20 years old so you will not handle as flat. This was very evident in the black 964 3.3 T we had running in our group....lots of nose up, nose down going on and lots of leaning in the corners....
#3125
Burning Brakes
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MJG:
That first photo was you just about to pass that corvette right???
Awesome day, the C2s went really well, still stuggling with tyre getting too hot and no front grip and finding where to set the hot pressures. I'm getting about a 6psi rise from cold and trying to end up with 34ish front and 36ish rear hot. Don't know if that's good or not.
Oil temp was up to 120 on that last run of the day. Pagid blues in front performed reasonably well but seemed to start to go off on the last session of the day?
Matt
That first photo was you just about to pass that corvette right???
Awesome day, the C2s went really well, still stuggling with tyre getting too hot and no front grip and finding where to set the hot pressures. I'm getting about a 6psi rise from cold and trying to end up with 34ish front and 36ish rear hot. Don't know if that's good or not.
Oil temp was up to 120 on that last run of the day. Pagid blues in front performed reasonably well but seemed to start to go off on the last session of the day?
Matt
#3126
Burning Brakes
#3128
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Awesome day, the C2s went really well, still stuggling with tyre getting too hot and no front grip and finding where to set the hot pressures. I'm getting about a 6psi rise from cold and trying to end up with 34ish front and 36ish rear hot. Don't know if that's good or not.
Yeah, I'll order one or two spares (probably the larger GT3 Cup version, which is also cheaper!) from wherever is cheapest overseas... but I'll suck it up and get the replacement now so I'm ready for Hampton Downs on the 9th.
#3129
Three Wheelin'
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replacement front splitters (or not) has been debate on forums like this all around the world many times. Must say when I had a 996gt3 I just took it off like Macca and gave it to the next owner wrapped in bubble wrap.
#3130
Rennlist Member
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Matt. The top speed you are likely to achieve at HD is 210ish on the front straight. At this speed any minor down force or aero that black bit of plastic gives is minimal so don't be concerned it will affect vehicle stability. At 270kmph on the Northern Loop sure it may make a small difference. Just saying, dont get concerned its actually doing much as from my experience (and Im sure Graeme will agree) its mostly keeping Porsche worldwide part profits higher. Plenty of debate on this on Pistonheads etc.
#3131
Three Wheelin'
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My experience with Nitrogen is that you will still get 6 or 7 psi expansion from heat relative to overnight cold but it stops there rather than continuing to expand. With air on a 45km stage and hot day I once got 11 psi from overnight cold (or 7psi above touring)
#3132
Rennlist Member
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My experience with nitrogen is that its a waste of time because as soon as you pump the tyres up again after the track work with your electric air-pump you are introducing oxygen and compromises the N2s benefits. N2 is hard to find a supply of and expensive unless you carry a bottle of it (not sure if you can buy it like that in NZ).
I found with my RE11s I was getting 9 psi from overnight cold to high after a 10 lap track session and that the tyres were best between lap 0.5 and 5.5. With an R compound at ideal hot pressures Id expect from lap 1.0 to lap 7.5/8 before they start to go off.
I would suggest your 2007 fronts are well heat cycled and as these are arguably the most important points of grip on the 911 you will find the biggest gains by changing these out for new rubber.
As Graeme says N2 gives you only 5 psi benefit in reality. Some people believe (falsely) that N2 doesnt expand when hot. Its a gas so it does expand. Fact is you may save yourself maybe 1 or 2 bleeds over the course of a 7-8 session track day but no more than that IMHO...
I found with my RE11s I was getting 9 psi from overnight cold to high after a 10 lap track session and that the tyres were best between lap 0.5 and 5.5. With an R compound at ideal hot pressures Id expect from lap 1.0 to lap 7.5/8 before they start to go off.
I would suggest your 2007 fronts are well heat cycled and as these are arguably the most important points of grip on the 911 you will find the biggest gains by changing these out for new rubber.
As Graeme says N2 gives you only 5 psi benefit in reality. Some people believe (falsely) that N2 doesnt expand when hot. Its a gas so it does expand. Fact is you may save yourself maybe 1 or 2 bleeds over the course of a 7-8 session track day but no more than that IMHO...
#3133
Drifting
#3134
Rennlist Member
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David dont stress. Do yourself a favour and email mark at FD Motorsport. He will give you the best pricing including freight you can get. Make sure you mention me. I use FD for everything these days unless the item is made in Europe like the Heigo cage (which is finally ready in 2 weeks according to the factory - the longest part order barr my VDO custom dials which took almost a year!).
fdmotorsports@comcast.net
fdmotorsports@comcast.net
#3135
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As mentioned earlier, it works in combination with the other changes made to the car. Doesn't make sense to have thousands of dollars worth of RS aero mods on a car and then start throwing bits away.