I finally did it, yeah i'm an heretic...
#31
05-21-2010 | 05:50 PM
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I was not sure between:
- Orange
- Orange-red
- Lime green
- Bronze (candy powder coat)
- Blue
Probably all 5 could match well with grey but i decided to go with orange.
#32
05-21-2010 | 06:00 PM
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I've been thinking of trying 18 front and 19 rear for a while.
I always thought the wives tales about matching front & rear tire brands was a lot of hooey. The fact is the traction characteristics of the front & rear on the 911 are so vastly different that adding another difference is not a big deal. On a balanced car like a Cayman I think you would notice it a lot more.
I always thought the wives tales about matching front & rear tire brands was a lot of hooey. The fact is the traction characteristics of the front & rear on the 911 are so vastly different that adding another difference is not a big deal. On a balanced car like a Cayman I think you would notice it a lot more.
I had a Mazda RX8 few years ago (pretty much 50/50 distribution) and i tried staggered wheels instead of all same on 4 corners; the car's overall feeling was not ruined because of that. Really not. However, the type/model of tires used was making a big difference
#33
05-21-2010 | 06:11 PM
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biggest tire for 11" rim would be 315. on 12" rim - 345.
you can stretch tires to crazy extremes if you are after some speciic effects - some folks run 275 tires on a 8" front rims.
I do not think you did a smart thing using 20" rears. I just do not see what it was you gained. you definitely lost plenty of acceleration by going to 20" from 19", most people go other way - to 18" and there are pretty obvious reasons for that.
But if yours is a street only car that will never see any extreme driving - you will be more than fine.
to really see effects of your changes you need to take it to some time tracking events and try different configurations there.
you can stretch tires to crazy extremes if you are after some speciic effects - some folks run 275 tires on a 8" front rims.
I do not think you did a smart thing using 20" rears. I just do not see what it was you gained. you definitely lost plenty of acceleration by going to 20" from 19", most people go other way - to 18" and there are pretty obvious reasons for that.
But if yours is a street only car that will never see any extreme driving - you will be more than fine.
to really see effects of your changes you need to take it to some time tracking events and try different configurations there.
But nothing larger than 295 is available, and i needed to match the O.D. required for the 245-35-19, which is AT LEAST 305's... And see ? Now i would like 315 or 325's (i'll probably order it soon)
I've read reviews everywhere about the AD08 being amazing for steering response, laser-sharp front end feeling, etc.. And i know the Pirelli Pzero to be an excellent tire for rear-end; grippy and very easy to control when it drifts and -bonus- good traction on wet.
So i figured i had a great combination.
So far, everything expected is happening.
#35
05-21-2010 | 06:25 PM
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Jon - I actually like the look, it's different and not for everyone but tastefully done.
As for the tires and different rim sizes you definitely changed the dynamics of the car, but that doesn't necessarily mean in a bad way. The Yok's are good tires but they are soft and not 'N' rated. They are a great steering tire though so you may be on to something. The Pirelli's in the back are a great choice for obvious reasons. All I can say is there is a lot of science that goes into treads/compounds these days and the Porsche is one car that benefits greatly from design.
My bigger concern is your car is raked now right? That to me would upset the balance much more than the treads. I would think this would promote more oversteer with such a heavy rear-end, so be careful and keep us informed of your results.
-Steve
As for the tires and different rim sizes you definitely changed the dynamics of the car, but that doesn't necessarily mean in a bad way. The Yok's are good tires but they are soft and not 'N' rated. They are a great steering tire though so you may be on to something. The Pirelli's in the back are a great choice for obvious reasons. All I can say is there is a lot of science that goes into treads/compounds these days and the Porsche is one car that benefits greatly from design.
My bigger concern is your car is raked now right? That to me would upset the balance much more than the treads. I would think this would promote more oversteer with such a heavy rear-end, so be careful and keep us informed of your results.
-Steve
I'm really at the point of thinking bringing the car on a track, with few sets of different wheels/tires, to make a real decent comparison. The public roads kind of limit the possibilities for obvious reasons.
Also, i may want to adjust my damptronics CO's and camber/toe-in. That will surely have a great impact.
But we're talking fine-tuning here. The kind of tweaking that could make a huge difference on a track ( and with laptime) but that is difficult to judge on a public road.. I mean, pass certain point it becomes more subjective.
It's the same for unsprung weight, i have a least 6 pounds difference on each corner now with the OZ superleggera and i don't really feel a difference (butt dyno) but that difference may appear on a chrono.
#39
05-22-2010 | 05:50 PM
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I think it looks great - just as the RS does as well. And I have no idea if the mismatched tires front to back will help or hinder handling. I'd assume that it will perform more poorly but in fact people mod the tire width (relative and absolute) which affects the relative grip from front to rear.
FWIW, my Ford GT comes from the factory with 18's on the front and 19's on the rear but with matched tires of course. OTOH, the stock tires are really not very good so the fact they are matched has little value.
But a lot of variables flying around here so it's hard to predict. In general, with mismatched tires, I'd want the stickier set on the front to mitigate the annoying understeer of the car. Beyond that, I haven't a clue and would just recommend some gentle driving until it's all better understood.
FWIW, my Ford GT comes from the factory with 18's on the front and 19's on the rear but with matched tires of course. OTOH, the stock tires are really not very good so the fact they are matched has little value.
But a lot of variables flying around here so it's hard to predict. In general, with mismatched tires, I'd want the stickier set on the front to mitigate the annoying understeer of the car. Beyond that, I haven't a clue and would just recommend some gentle driving until it's all better understood.
#40
05-22-2010 | 05:58 PM
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#42
05-22-2010 | 06:13 PM
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I think it looks awesome. +1 for being different. As far as your tire dilemma goes, let me shed some light and I know this will help a lot.
Personally I think the Pirelli Pzero Nero's on the 20" application is garbage. They're loud, slippery when hot, and they have a extremely rounded sidewall that offers little to no protect to our 20's. I'm actually surprised to hear that you thought the V12's were worse than the Pzero Narrow's. Also, they run SUPER narrow.
Lookwise you should be good with a 305/25/20 Michelin PS2 which will be slightly less sqaure than your front AD08's. I just made the move from 305 Pirellis and 305 PS2 yesterday.. It is honestly Night and Day in grip, tire sound, and looks.
Personally I think the Pirelli Pzero Nero's on the 20" application is garbage. They're loud, slippery when hot, and they have a extremely rounded sidewall that offers little to no protect to our 20's. I'm actually surprised to hear that you thought the V12's were worse than the Pzero Narrow's. Also, they run SUPER narrow.
Lookwise you should be good with a 305/25/20 Michelin PS2 which will be slightly less sqaure than your front AD08's. I just made the move from 305 Pirellis and 305 PS2 yesterday.. It is honestly Night and Day in grip, tire sound, and looks.
