BRZ Ts parts

[Poodles]

Read up on driveshaft critical speeds if you want to know more. They use 2 piece driveshafts to get this speed much higher, it's not for NVH reasons.

[Michael Blue]

Originally Posted by Kostamojen

I know all about deivetrain weight loss...

Originally Posted by Kostamojen

Doesn't matter...It won't make the car any faster or more reliable when its stock.

Apparently you don't "know all about drivetrain weight loss".

A lighter driveshaft, flywheel, lighter wheel/tire package, lighter brake rotors...
These will ALL directly affect acceleration and braking and can make the car feel a LOT more responsive.
It's not always about strength or reliability.

http://www.ebay.com/itm/2012-Scion-F...675552&vxp=mtr

The 1-piece driveshaft for the 2012 Scion FR-S / Subaru BRZ / Toyota GT86 is a complete 2.75'' Carbon Fiber shaft that is approximately 1/2 the weight of the factory 2-piece driveshaft. The 1-piece carbon shaft features larger, replaceable u-joints and can handle about 800WHP. We had the tubing custom wound with a high modulus fiber to ensure the strength while making it small enough to clear everything under the car. All of the factory shields, plates and covers can be used without any alteration to the car at all. The ends are made from 6061-T6 aluminum and that shaft weighs a mere 12.2lbs. Not only will the car feel more responsive but it will also make a noticeable difference on the noise level in the car.

By removing the factory 2-piece shaft and installing a single shaft, the car will feel more responsive due to the lighter weight of the shaft and also the fact that the hanger bearing is not moving up and down during acceleration. Available for most popular motor/trans combinations, if you don’t see yours listed, custom shafts are also available.

Please Note: This driveshaft is rated to 850WHP.
<h4>Part Number: TOSH86-C</h4><h4>Questions? Message Us or Call Us 919-593-8424

</h4>

[tahdizzle]

So by increasing the critical speed of the drive shaft (larger diameter, w/o increasing weight).

The drive shaft can spin at a higher RPM w/o risk of failure.

With that information, a larger diameter drive shaft would allow you to increase engine/transmission RPM safely in terms of the drive shaft.

I don't believe they have increased the RPM limit in the BRZ tS, but the TS driveshaft is a lighter, larger, and single piece drive shaft.

So if they haven't increased the RPM range in the tS, then the benefit of a larger diameter drive shaft is kind of lost.

[Createddeleted]

Originally Posted by tahdizzle

So if they haven't increased the RPM range in the tS, then the benefit of a larger diameter drive shaft is kind of lost.

Unless it's for NVH/ engineering specifications.

1 piece aluminum driveshafts tend to run larger anyways.

[Kostamojen]

Originally Posted by Michael Blue

Apparently you don't "know all about drivetrain weight loss".

A lighter driveshaft, flywheel, lighter wheel/tire package, lighter brake rotors...
These will ALL directly affect acceleration and braking and can make the car feel a LOT more responsive.
It's not always about strength or reliability.

I had everything lightened in my N/A impreza exlcuding the driveshaft. I could never justify the expense for the driveshaft, but folks here seem to jump right to it when IMO its the last piece of the puzzle not the first piece.

You will get more results for your money from a flywheel, lighter wheels/tires, etc. This STI driveshaft sounds like.a great OEM option to the carbon fiber aftermarket options, but spend your money elsewhere first.

[tahdizzle]

Originally Posted by Kostamojen

I had everything lightened in my N/A impreza exlcuding the driveshaft. I could never justify the expense for the driveshaft, but folks here seem to jump right to it when IMO its the last piece of the puzzle not the first piece.

You will get more results for your money from a flywheel, lighter wheels/tires, etc. This STI driveshaft sounds like.a great OEM option to the carbon fiber aftermarket options, but spend your money elsewhere first.

I think its a bit naive to say a flywheel is a better use of money than the drive shaft.

Do you have any experience with your car mutually exclusive of the two?

Impreza w/ drive shaft only
Impreza w/ flywheel only
Impreza w/ drive shaft + flywheel.

Then we have the brz. is the rotational mass saved from the OEM flywheel compared to an aftermarket flywheel a greater savings compared to the OEM 2 piece drive shaft, to a light weight one piece drive shaft?

[chanomatik]

Originally Posted by tahdizzle

So by increasing the critical speed of the drive shaft (larger diameter, w/o increasing weight).

The drive shaft can spin at a higher RPM w/o risk of failure.

With that information, a larger diameter drive shaft would allow you to increase engine/transmission RPM safely in terms of the drive shaft.

I don't believe they have increased the RPM limit in the BRZ tS, but the TS driveshaft is a lighter, larger, and single piece drive shaft.

So if they haven't increased the RPM range in the tS, then the benefit of a larger diameter drive shaft is kind of lost.

I would think that it has more to do with the tS being more "track ready", purposed for hanging out at high RPMs all day. Therefore it would stand to reason that having a driveshaft that can hangout at the higher RPMs for prolonged use for a car made for more specific purposes would benefit greatly over a stock driveshaft.

Same reason why the tS gets Brembo brakes. Bigger brakes have less brake fade over the course of a track day. Subaru/STI felt the 4-pot/2-pot Brembos were adequate and significant enough of an improvement over the stock floating calipers.

[tahdizzle]

Originally Posted by chanomatik

I would think that it has more to do with the tS being more "track ready", purposed for hanging out at high RPMs all day. Therefore it would stand to reason that having a driveshaft that can hangout at the higher RPMs for prolonged use for a car made for more specific purposes would benefit greatly over a stock driveshaft.

Same reason why the tS gets Brembo brakes. Bigger brakes have less brake fade over the course of a track day. Subaru/STI felt the 4-pot/2-pot Brembos were adequate and significant enough of an improvement over the stock floating calipers.

If the RPM limit has not changed, then the stock drive shaft should not reach critical speed. Even at any length of time at RPM, if the drive shaft doesn't reach critical speed it will not fail due to critical speed.

I am not saying that the one piece driveshaft isn't performance intended, I'm just saying if the larger diameter only modifies critical speed, then the larger diameter drive shaft is not needed.

Not saying a lighter one piece drive shat isn't needed. Just a larger diameter isn't needed.

[mister.bond]

on japanparts webside i only found the STI Brake Set for the Front
is there a STI Brake Set for Rear also availible ?

[chanomatik]

Originally Posted by tahdizzle

If the RPM limit has not changed, then the stock drive shaft should not reach critical speed. Even at any length of time at RPM, if the drive shaft doesn't reach critical speed it will not fail due to critical speed.

I am not saying that the one piece driveshaft isn't performance intended, I'm just saying if the larger diameter only modifies critical speed, then the larger diameter drive shaft is not needed.

Not saying a lighter one piece drive shat isn't needed. Just a larger diameter isn't needed.

Gotcha. I have no clue why they'd go larger, but choose to go with one piece and lighter. I still stand by my "track ready" or "track abuse" theory, though. No disadvantage to making it larger if they can make it lighter and more guarantee its robustness.

[Kostamojen]

A larger diameter shaft probably wont work with the TRD quickshift either... That has clearance issues with the stock driveshaft.

I wish they would have thrown more effort into improving the CV's, those are more of an issue than the driveshaft ever will be...

[chanomatik]

Originally Posted by mister.bond

on japanparts webside i only found the STI Brake Set for the Front
is there a STI Brake Set for Rear also availible ?

Much cheaper to get used and get a rebuild kit or get better Brembos, like the 6-pot kit for the front. I just don't see any justification for it.

Also the front of the BRZ is a bit unique, so having the tS front Brembos makes sense. For the rears just get the GV/GR STI rear ones.

http://www.japanparts.com/db/parts_d...=&SEARCH_page=

Looks like the 6-pot fronts are actually cheaper anyways by $500.
http://www.japanparts.com/db/parts_d...=&SEARCH_page=

[krayzie]

Originally Posted by tahdizzle

Because STi just does things because it has no performance value whatsoever.

STI doesn't sell performance figures with their parts, only promise on improved handling / feel.

This apparently doesn't sit too well with the Internet generation that are too hung up on numbers.

[DSOmegaX]

Originally Posted by mister.bond

on japanparts webside i only found the STI Brake Set for the Front
is there a STI Brake Set for Rear also availible ?

You can request them to add it. Or as @chanomatik said, its cheaper to just piece together a kit from a GV/GR WRX STI. I'm putting in my set next week. Less than $2000 in parts.