2017 Subaru BRZ Facelift

[darthpnoy1984]

Originally Posted by irax

You know.. for some reason I always thought we had a 12 gallon tank.

Usually I already fill up by around 8 to 9 gallons. I do hope on next generation Toyota/Subaru should give a car an option to increase the fuel tank capacity like how the 911 do it would be great option for daily grinders like myself or for long commutes.



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[Tcoat]

Originally Posted by darthpnoy1984

Usually I already fill up by around 8 to 9 gallons. I do hope on next generation Toyota/Subaru should give a car an option to increase the fuel tank capacity like how the 911 do it would be great option for daily grinders like myself or for long commutes.



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They already had to split the tank and give it all sorts of weird and wonderful shapes to make it fit so doubt you will ever see one much bigger. Not like there is a pile of extra space under there.

[HunterGreene]

Originally Posted by irax

You know.. for some reason I always thought we had a 12 gallon tank.

13.2, to be exact. Our low fuel light goes on very early, usually with 3-4 gallons left, depending on how much sloshing is going on. I generally go by milage, if i get above 300 miles, its about time. Your experience may vary.

Originally Posted by darthpnoy1984

Usually I already fill up by around 8 to 9 gallons. I do hope on next generation Toyota/Subaru should give a car an option to increase the fuel tank capacity like how the 911 do it would be great option for daily grinders like myself or for long commutes.

Except we're not worth the time or investment. So you can either continue to fill up right when the low fuel light comes on, or trust that you wont be out when the needle hits "E" (which I have been to and can tell you I still had over a gallon left in the tank). Largest fillup since ive been keeping track was about 11.5 gallons, but I remember doing slightly over 12 at some point early on.

[Yoshoobaroo]

Originally Posted by nikitopo

There were some discussions in the past if our car needs stiffer or lighter wheels. Enkei had a racing dedicated wheel which was going in the stiffer direction. Now I find a review saying the BRZ 2017 has stiffer alloy wheels. Details here:


http://driving.ca/subaru/brz/reviews...017-subaru-brz


Can anyone confirm this?

That sounds like marketing brochure BS to me. While probably technically true, I guarantee that it does not provide any measurable difference in the driving dynamics.

[DAEMANO]

Originally Posted by Yoshoobaroo

That sounds like marketing brochure BS to me. While probably technically true, I guarantee that it does not provide any measurable difference in the driving dynamics.

Wheel manufacturers take lateral, radial, and tangential stiffness quite seriously when determining wheel design, metallurgy and their trade-offs with weight, and cost.

Under load, the stiffest wheel is going to deform the least in the aforementioned directions thus providing the most predictable tire contact patch shape and behavior thus directly affecting driving dynamics.



The trade-off is that generally stiffer = heavier unless more exotic design, materials and mfg techniques are used thus increasing cost. To your average street driver, this might not matter. To someone involved in motorsports it will. If Toyobaru has improved the stiffness of the wheels on the 86 without passing the cost on to owners than it is definitely worth mentioning as a value-add. Buying aftermarket wheels to achieve the same effect is a real cost.

[Yoshoobaroo]

Originally Posted by DAEMANO

Wheel manufacturers take lateral, radial, and tangential stiffness quite seriously when determining wheel design, metallurgy and their trade-offs with weight, and cost.

Under load, the stiffest wheel is going to deform the least in the aforementioned directions thus providing the most predictable tire contact patch shape and behavior thus directly affecting driving dynamics.

Yes, like I said, while technically true, i still don't think it would make a difference on this car, because:

1. Both wheels are low pressure cast and weigh about the same, so the difference in stiffness would be due to geometry change in the face of the wheel, which is minimal.

2. This car is light and not able to put THAT much load on the wheels. If BMW can get away with thin spokes on their 4000lbs+ M5/6, we can too.

3. Contact patch will vary much more due to bushing deflection than wheel deflection. let alone the deformation of the tire itself. These aren't formula 1 cars.

Unless I see data that proves otherwise, I'm willing to bet you cannot feel the difference between the 2, OR measure it with a stopwatch outside of a statistically significant margin of error.

[Dadhawk]

Originally Posted by irax

You know.. for some reason I always thought we had a 12 gallon tank.

Went back and checked, most I've ever put in is 11.878 gallons, so at that I'm leaving almost two gallons in the tank even though the needle was below E. I should have kept driving!

Originally Posted by darthpnoy1984

Usually I already fill up by around 8 to 9 gallons. I do hope on next generation Toyota/Subaru should give a car an option to increase the fuel tank capacity like how the 911 do it would be great option for daily grinders like myself or for long commutes.

Honestly, I wouldn't want the tank to be much bigger. I average 343 miles to the tank over 4.5 years. No reason to haul an additional one or two gallons around for 343 miles just to go another 30-60 miles.

[DAEMANO]

Originally Posted by Yoshoobaroo

Yes, like I said, while technically true, i still don't think it would make a difference on this car, because:

1. Both wheels are low pressure cast and weigh about the same, so the difference in stiffness would be due to geometry change in the face of the wheel, which is minimal.

2. This car is light and not able to put THAT much load on the wheels. If BMW can get away with thin spokes on their 4000lbs+ M5/6, we can too.

3. Contact patch will vary much more due to bushing deflection than wheel deflection. let alone the deformation of the tire itself. These aren't formula 1 cars.

Unless I see data that proves otherwise, I'm willing to bet you cannot feel the difference between the 2, OR measure it with a stopwatch outside of a statistically significant margin of error.

Still, the point stands...

If Toyobaru has improved the stiffness of the wheels on the 86 without passing the cost on to owners than it is definitely worth mentioning as a value-add. Buying aftermarket wheels to achieve the same effect is a real cost.

[funwheeldrive]

I just want to know when I can buy carbon fiber wheels for this car.

[Sport-Tech]

Originally Posted by funwheeldrive

I just want to know when I can buy carbon fiber wheels for this car.

Don't forget the requisite ceramic brake package....

[Yoshoobaroo]

Btw, this pertains to tires, not wheels. Not saying you are confusing the two, just clarifying for anyone else.

Originally Posted by DAEMANO

[DAEMANO]

Originally Posted by Yoshoobaroo

Btw, this pertains to tires, not wheels. Not saying you are confusing the two, just clarifying for anyone else.

Radial, lateral and tangential deformation due to lack of (dynamic) stiffness affect the performance of tires and weight of the wheels and thus the car. Put plainly, if the wheel shape changes under load, so does the shape of the tire (contact patch, sidewall, etc). That's the point. Not saying that's not getting through to you, but for anyone else, please note.

Thanks for the P.S.A. anyhow.

[Yoshoobaroo]

Originally Posted by DAEMANO

Radial, lateral and tangential deformation due to lack of (dynamic) stiffness affect the performance of tires and weight of the wheels and thus the car. Put plainly, if the wheel shape changes under load, so does the shape of the tire (contact patch, sidewall, etc). That's the point. Not saying that's not getting through to you, but for anyone else, please note.

Thanks for the P.S.A. anyhow.

Yep, valid points, but without numbers behind them you cannot predict how much of an effect will occur.

You fail to consider that the aluminum of the wheels is literally ten thousand times stiffer than tire rubber (Young's Modulus of ~7*10^10 vs ~7*10^6). That means that, roughly, if the tire deflects 1" (pretty extreme, but for the sake of argument), the wheel will deflect 1/1000th of an inch. The wheels aren't even cast to that tolerance, not even close! Most OEM wheels are held to a ~3mm tolerance (118/1000ths of an inch).
Stiffening the stock wheels to improve the handling of a car is a fool's errand.

Considering that the old wheel style performs more than adequately, any stiffness gained in the new wheels will have a virtually immeasurable effect on the car's handling. It's neat to put in the brochure though.

-Josh

[Mim]

Its only been mentioned as a marketing ploy, to make people think the wheels are special in some way and, be less likely to feel the need to swap them for something after market.

I like the look of the new ones, but then I also like the look of the old ones too ^_^"