Bridgestone Tyres
09-08-2004, 04:42 PM
#21
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If someone has come to the S from a front wheel drive car then they probably WILL get understeer when driving hard until they modify their driving style:
FWD = turn in AND depress right foot,
RWD = turn in THEN depress right foot...
That's how I stuffed my first set of fronts in 12k!
FWD = turn in AND depress right foot,
RWD = turn in THEN depress right foot...
That's how I stuffed my first set of fronts in 12k!
09-08-2004, 04:59 PM
#22
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DavidM, have there been any tyre tests in the magazines lately? If not, are we due for one soon?
No, no new tyre tests that i know off. There were couple earlier in the year, but I would not be surprised if one of the local mags (ie. Motor) had one over the next couple months.
Since that time there have been several advances in rubber chemistry and tyre tecnology. Many of the new 2003-2004 tyres would offer better performance than a 1999 tyre.
Yes, and no from what I gather. S02s still seem to be regarded as the pinacle of road tyre technology/grip. Though, there 'should' be now tyres arounds that can match it ... main candidates being:
- Continental ContiSport2
- Michelin PilotSport2
- Yokomaha AVS
- Pirelli Pzero Rosso
I only have personal experience with Pzero Rosos and ContiSport2 from that list and that is on the HSV. The Pzeros were good, but not as good as the S02s, while the COntoSport2 are too new (ie. 2 weeks) to make an objective call.
ps. The Bridgestone tyre that should be supersior to the S02 is the new RE070, but that does not come in many sizes just yet. The Re070 is possibly the best (performance) tyre in the world at the moment.
No, no new tyre tests that i know off. There were couple earlier in the year, but I would not be surprised if one of the local mags (ie. Motor) had one over the next couple months.
Since that time there have been several advances in rubber chemistry and tyre tecnology. Many of the new 2003-2004 tyres would offer better performance than a 1999 tyre.
Yes, and no from what I gather. S02s still seem to be regarded as the pinacle of road tyre technology/grip. Though, there 'should' be now tyres arounds that can match it ... main candidates being:
- Continental ContiSport2
- Michelin PilotSport2
- Yokomaha AVS
- Pirelli Pzero Rosso
I only have personal experience with Pzero Rosos and ContiSport2 from that list and that is on the HSV. The Pzeros were good, but not as good as the S02s, while the COntoSport2 are too new (ie. 2 weeks) to make an objective call.
ps. The Bridgestone tyre that should be supersior to the S02 is the new RE070, but that does not come in many sizes just yet. The Re070 is possibly the best (performance) tyre in the world at the moment.
09-08-2004, 05:15 PM
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Re the Dunlop SP 9000 - I've got them on the Lexus. They should have come with ear plugs - WAY too noisy, sounds like sick wheel bearings under 50kph, better over that.
09-08-2004, 08:45 PM
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To continue the hijack, I do agree with Red's definitions of, and corrections for, under and oversteer, my point was that the S (or any RWD car, esp with an LSD) can understeer if the power is applied before the car starts to turn in - even if it's "natural" state was neutral or even oversteer.
AAEIE - with both rear wheels pushing straight and the fronts trying to turn you will get understeer. An LSD reduces the ability of the diff to compensate for the different radii that the tyres are trying to use, so you get an exagerated effect over a non LSD equipped car.
Coffee break over, I'd better get back to work!
AAEIE - with both rear wheels pushing straight and the fronts trying to turn you will get understeer. An LSD reduces the ability of the diff to compensate for the different radii that the tyres are trying to use, so you get an exagerated effect over a non LSD equipped car.
Coffee break over, I'd better get back to work!
09-09-2004, 12:01 AM
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Steptoe, Thanks for that. Your picture is worth 1001 words 
Now that we've got a clear definition of what understeer is I'd like to ask all the people who've said they experienced understeer on their S2000: Is this what you experienced? Is that what you really meant
Whilst I agree with Billyblue that it is theoretically possible to get an S2000 to understeer I find it hard to believe that you could actually do it in a real life situation.
Anyway, getting back on topic - the tyres. IMHO the S02s are no longer the best tyre available and I suggest that anyone who is considering new tyres would be well advised to do a bit of research into alternatives.
Now that we've got a clear definition of what understeer is I'd like to ask all the people who've said they experienced understeer on their S2000: Is this what you experienced? Is that what you really meant
Whilst I agree with Billyblue that it is theoretically possible to get an S2000 to understeer I find it hard to believe that you could actually do it in a real life situation.
Anyway, getting back on topic - the tyres. IMHO the S02s are no longer the best tyre available and I suggest that anyone who is considering new tyres would be well advised to do a bit of research into alternatives.
09-09-2004, 03:04 AM
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This particular post is only about 245/45/16 rear tyres. If a tyre matches the 245/45R16 size I will include if it has a matching 205/55R16 front if I can find it.
Hopefully this will save some ppl some time looking around.
----------
Avon tyres
website sux - no matches found
BFGoodrich
Appears to have ProfilerG in 245/45R16 but I couldn't find the 205/55R16
Bridgestone
only have 225/50R16 (no 245/45R16 in any tyre)
Continental Sportcontact are avail in:
245/45ZR16 and 205/55ZR16 (Note these are N1 Porsche Spec tyres)
Dunlop SP9000E
only 245 tyres are all over 18 inches (no 16 inch avail).
Kumho
Ecsta 711 and Ecsta 712
245/45R16 and 205/55R16 (speed ratings vary between tyres)
Michelin
Pilot Sport 245/45ZR16 (website sux -search for Porsche 928 S4 GT 5.0 rear)
Pirelli
no matches found
Yokohama
No matches found
Hopefully this will save some ppl some time looking around.
----------
Avon tyres
website sux - no matches found
BFGoodrich
Appears to have ProfilerG in 245/45R16 but I couldn't find the 205/55R16
Bridgestone
only have 225/50R16 (no 245/45R16 in any tyre)
Continental Sportcontact are avail in:
245/45ZR16 and 205/55ZR16 (Note these are N1 Porsche Spec tyres)
Dunlop SP9000E
only 245 tyres are all over 18 inches (no 16 inch avail).
Kumho
Ecsta 711 and Ecsta 712
245/45R16 and 205/55R16 (speed ratings vary between tyres)
Michelin
Pilot Sport 245/45ZR16 (website sux -search for Porsche 928 S4 GT 5.0 rear)
Pirelli
no matches found
Yokohama
No matches found
09-09-2004, 03:33 AM
#29
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I was at my local Michelin dealer last week and I picked up a copy of their latest brochure which I've got in front of me as I type this.
The Michelin Pilot Preceda is definitely available in 205/55R16 & 225/50R16.
I have driven another S2000 with these fitted and I will most likely get these myself when the time comes to replace my current tyres.
The Michelin Pilot Preceda is definitely available in 205/55R16 & 225/50R16.
I have driven another S2000 with these fitted and I will most likely get these myself when the time comes to replace my current tyres.
09-09-2004, 05:58 AM
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Whilst I agree with Billyblue that it is theoretically possible to get an S2000 to understeer I find it hard to believe that you could actually do it in a real life situation.
At DECA in the wet it was reasonably eazy to get the S2000 to understeer. The easiest way was to come in too hot to the cone and try and do a 180deg turn. With too much entry speed, any/every car will understeer there .... so S2000 is not different there. Another way to do it was to get on power a bit too early and then yo'd push it from from constant turn to understeer. You had to be very patient 'till you're at least 1/2 way around and then you could actually power oversteer as you could eazy on the steering lock.
Though, on the actual track I've never had any understeer to speak off. Maybe very mild doze when comming in too hot/deep around the gum-tree corners at Winton.
At DECA in the wet it was reasonably eazy to get the S2000 to understeer. The easiest way was to come in too hot to the cone and try and do a 180deg turn. With too much entry speed, any/every car will understeer there .... so S2000 is not different there. Another way to do it was to get on power a bit too early and then yo'd push it from from constant turn to understeer. You had to be very patient 'till you're at least 1/2 way around and then you could actually power oversteer as you could eazy on the steering lock.
Though, on the actual track I've never had any understeer to speak off. Maybe very mild doze when comming in too hot/deep around the gum-tree corners at Winton.