996 Turbo Picture Thread
#2281
RL Community Team
Rennlist Member
Rennlist Member
Thank you Sir, that is my hope...
Now that we've determined that, I'm afraid it'll look weird with 19s...
Now that we've determined that, I'm afraid it'll look weird with 19s...
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sdematt (01-11-2024)
#2284
RL Community Team
Rennlist Member
Rennlist Member
I know the rear will be taller, and in theory, I'm ok with that - I absolutely hated the 245/18 on the front, it looked ridiculous.
#2286
Rennlist Member
I have my Arctic Silver 996 Turbo running 18" Apex SM10 wheels (9"/12", 245/40, 315/30) and my Polar Silver on 19" Wheel Dynamics 808 wheels (8.5"/11", 235/35, 305/30).
While I like both, I prefer the looks and driving characteristics of the 18" setup. Preferences vary for sure...
Arctic/Apex/18"
Polar/WD808/19"
While I like both, I prefer the looks and driving characteristics of the 18" setup. Preferences vary for sure...
Arctic/Apex/18"
Polar/WD808/19"
#2289
RL Community Team
Rennlist Member
Rennlist Member
#2290
RL Community Team
Rennlist Member
Rennlist Member
#2291
RL Community Team
Rennlist Member
Rennlist Member
I have my Arctic Silver 996 Turbo running 18" Apex SM10 wheels (9"/12", 245/40, 315/30) and my Polar Silver on 19" Wheel Dynamics 808 wheels (8.5"/11", 235/35, 305/30).
While I like both, I prefer the looks and driving characteristics of the 18" setup. Preferences vary for sure...
Arctic/Apex/18"
Polar/WD808/19"
While I like both, I prefer the looks and driving characteristics of the 18" setup. Preferences vary for sure...
Arctic/Apex/18"
Polar/WD808/19"
I do love those rims on Polar, they are slick.
#2292
Rennlist Member
My problem with the 19" setup is that there really isn't a readily available tire combo that properly biases the AWD viscous coupler in widths that make sense....
Ideally, the rear tires should be a slightly SHORTER diameter than the front, so it spins just slightly faster, and begins to pre-load the viscous coupler for torque transfer. When the rear starts to spin, it further engages the viscous coupler quickly and transfers torque to the front. When biased this way, the car feels very much like a RWD car unless and until the rear breaks traction.
When the rear is TALLER than the front, the viscous coupler is biased the wrong way... The front is spinning faster, and it's preloading the coupler the wrong way. This causes some drag on the front axle, and requires the rears to slip/spin even more to first overcome the incorrect bias, then actually start to transfer torque.
If you have a RWD conversion, this makes no difference. If you have a 997 Turbo, this also is not an issue, as they replaced the viscous coupler with a electronically controlled clutch pack. But on a 996 running AWD, I think it makes a notable difference in how the car feels.
Example of my preferred 18" tire/wheel setup:
Front: 245/40-18 (25.7" diameter)
Rear: 315/30-18 (25.4" diameter)
Rear is slightly SHORTER, therefore turns slightly faster, and biases the viscous coupler CORRECTLY.
Example of typical 19" tire/wheel setup:
Front: 235/35-19 (25.5" diameter)
Rear: 305/30-19 (26.2" diameter)
Rear is slightly TALLER, therefore turns slightly slower, and biases the viscous coupler INCORRECTLY.
There are theoretically other fornt/rear tire combos in 19" that would provide correct bias, but not readily available these days. For example, 235/35-19 (25.5 inches tall) + 315/25-19 (25.28 inches tall). This would be freaking perfect, BUT tire rack lists not a single tire available in 315/25-19 let alone a matched set with the fronts...
You could also run 225/40-19 (26.1") and 295/30- 19 (26"), but that gives up so much needed tire width (20mm front and rear vs. my preferred 18" setup), and it's kind of tall in the front causing potential fitment issues. But at least it biases the viscous coupler correctly.
Ideally, the rear tires should be a slightly SHORTER diameter than the front, so it spins just slightly faster, and begins to pre-load the viscous coupler for torque transfer. When the rear starts to spin, it further engages the viscous coupler quickly and transfers torque to the front. When biased this way, the car feels very much like a RWD car unless and until the rear breaks traction.
When the rear is TALLER than the front, the viscous coupler is biased the wrong way... The front is spinning faster, and it's preloading the coupler the wrong way. This causes some drag on the front axle, and requires the rears to slip/spin even more to first overcome the incorrect bias, then actually start to transfer torque.
If you have a RWD conversion, this makes no difference. If you have a 997 Turbo, this also is not an issue, as they replaced the viscous coupler with a electronically controlled clutch pack. But on a 996 running AWD, I think it makes a notable difference in how the car feels.
Example of my preferred 18" tire/wheel setup:
Front: 245/40-18 (25.7" diameter)
Rear: 315/30-18 (25.4" diameter)
Rear is slightly SHORTER, therefore turns slightly faster, and biases the viscous coupler CORRECTLY.
Example of typical 19" tire/wheel setup:
Front: 235/35-19 (25.5" diameter)
Rear: 305/30-19 (26.2" diameter)
Rear is slightly TALLER, therefore turns slightly slower, and biases the viscous coupler INCORRECTLY.
There are theoretically other fornt/rear tire combos in 19" that would provide correct bias, but not readily available these days. For example, 235/35-19 (25.5 inches tall) + 315/25-19 (25.28 inches tall). This would be freaking perfect, BUT tire rack lists not a single tire available in 315/25-19 let alone a matched set with the fronts...
You could also run 225/40-19 (26.1") and 295/30- 19 (26"), but that gives up so much needed tire width (20mm front and rear vs. my preferred 18" setup), and it's kind of tall in the front causing potential fitment issues. But at least it biases the viscous coupler correctly.
Last edited by pfbz; 01-11-2024 at 07:16 PM.
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QwikKotaTX (01-12-2024)
#2294
Rennlist Member
What 315? 315/25-19"? Have you checked into availability for replacing your rears when they wear out? The only availability I've seen in that size lately are on ebay, Continental Sportcontacts being shipped from Europe, often with older date codes and typically at quite high prices. Nitto's in that size were available for a while, but seemingly no longer.
Last edited by pfbz; 01-11-2024 at 07:40 PM.