GR86 driveshaft

[gpvecchi]

Did someone fitted the GR86 driveshaft to older versions?
I'm looking for impressions...

[Ruben_86_]

Originally Posted by gpvecchi

Did someone fitted the GR86 driveshaft to older versions?
I'm looking for impressions...

What is the difference?

[gpvecchi]

It's 1,5 kg lighter.

[RedReplicant]

The driveshaft / propshaft is lighter too, or do you mean what some people call axles? Sorry, naming varies too widely and I am curious

[gpvecchi]

I mean the shaft that connects gearbox to differential.

[Stephen02]

Why not just get a carbon fiber driveshaft and save 5.4kg and remove some of the drivetrain slop?

[NoHaveMSG]

Originally Posted by Stephen02

Why not just get a carbon fiber driveshaft and save 5.4kg and remove some of the drivetrain slop?

Most of the drivetrain slop is in the diff and CV's. Put your car on jackstands, lock park brake and rotate the driveshaft by hand and watch the CV's.

I can say I saw no improvement in performance with a vastly lighter aluminum driveshaft and doubt 1.5kg's is really going to matter. One of those end of the line mods to me.

[gpvecchi]

A single piece driveshaft will probably vibrate because of wrong pinion angle. You can find a lot of threads about this.

[NoHaveMSG]

Originally Posted by gpvecchi

A single piece driveshaft will probably vibrate because of wrong pinion angle. You can find a lot of threads about this.

I didn’t see anyone mention vibration with a single piece but since you want to bring it up.

Going to a single piece driveshaft lowers the critical speed of the drive shaft which causes vibration, longer shaft, lower critical speed. There are many threads on this. One of them was a DSS aluminum driveshaft which failed on the dyno because of this. DSS has admitted this is the issue and will reshaft an existing DSS driveshaft if you pay them too. The aluminum needs to be at least 3.5” to bring the critical speed up enough to work on our cars though there may be clearance issues, I talked to DSS about this myself as I have one of their aluminum shafts. The carbon does have a higher critical speed and issues with vibration on those may be down to pinion angle also being a factor but nobody has confirmed.

[Stephen02]

Fwiw people on this thread are saying that the DSS carbon fiber driveshaft didn't cause any additional NVH https://www.ft86club.com/forums/show...t=39701&page=3. But as NoHaveMSG said, he didn't notice any performance increase from going to an aluminum driveshaft which is lighter than the 2nd gen driveshaft. There are more cost effective ways to cut weight provided that you havent exhausted your other options.

[Grady]

Originally Posted by NoHaveMSG

I didn’t see anyone mention vibration with a single piece but since you want to bring it up.

Going to a single piece driveshaft lowers the critical speed of the drive shaft which causes vibration, longer shaft, lower critical speed. There are many threads on this. One of them was a DSS aluminum driveshaft which failed on the dyno because of this. DSS has admitted this is the issue and will reshaft an existing DSS driveshaft if you pay them too. The aluminum needs to be at least 3.5” to bring the critical speed up enough to work on our cars though there may be clearance issues, I talked to DSS about this myself as I have one of their aluminum shafts. The carbon does have a higher critical speed and issues with vibration on those may be down to pinion angle also being a factor but nobody has confirmed.

I can confirm on my Verus CF drive shaft it has a resonance at around 130. I have not looked into pinion angle or anything since the tracks around me are tight and 110 is is around my max speed so it is not an issue.

[blsfrs]

Buyer beware. Most vendors don't provide and warning about critical speed or pinion angle for the twins. Curiously the DSS shaft for WRX/STI does come with a 155 mph recommended limit. See below.

DSS 12-20 Scion FR-S/Subaru BRZ/Toyota GT86 Manual 3in Aluminum 1-Piece Driveshaft - TOSH86-A
click to zoom in

DSS 12-20 Scion FR-S/Subaru BRZ/Toyota GT86 Manual 3in Aluminum 1-Piece Driveshaft - TOSH86-A
Description
DSS 2012 Scion FR-S / Subaru BRZ / Toyota GT86 Manual 3in Aluminum 1-piece Driveshaft


Get the best prices and service on Driveshaft Shop products at Armageddon Turbo Systems (www.goturbo.net). We offer DSS's full line with the the best service possible.

For 30+ years The Driveshaft Shop has been creating and manufacturing innovative drivetrain solutions for street and racing use. Driveshaft Shop axles and driveshafts have been integral in helping racers set, and reset world records in categories of Front Wheel Drive, Rear Wheel Drive, and All Wheel Drive racing. We are a full CNC machine shop and manufacturing facility located in Salisbury, North Carolina, USA. Each driveshaft we produce is dynamically balanced at over 9000 RPMs to ensure unbeatable reliability. We offer the highest quality CV axles and driveshafts made from Steel, Aluminum, and Carbon Fiber for Sport Compact, European, and Modern Muscle car applications, not to mention our capability to build custom for just about anything. “We Specialize in the Impossible”



Get the best pricing and service on Driveshaft Shop parts today at www.goturbo.net - Armageddon Turbo Systems!

[NoHaveMSG]

Originally Posted by Stephen02

Fwiw people on this thread are saying that the DSS carbon fiber driveshaft didn't cause any additional NVH https://www.ft86club.com/forums/show...t=39701&page=3. But as NoHaveMSG said, he didn't notice any performance increase from going to an aluminum driveshaft which is lighter than the 2nd gen driveshaft. There are more cost effective ways to cut weight provided that you havent exhausted your other options.

I don't think most people have an issue with the CF shafts but some have reported vibration. I think pinion angle may have a little to do with it but CS seems to be a bigger factor. User @prandelia was one of the first I saw to bring this up. Then @blsfrs had his failure of a DSS aluminum shaft. I always had issues with my DSS AL shaft and had it rebalanced a couple times before I pulled it out. DSS wants like 3-350 to reshaft it you pay shipping.

https://www.ft86club.com/forums/show...8&postcount=31

[gpvecchi]

This is all absolutely OT. There are tons of threads for single piece driveshafts and this is not one of them.
Moderators, please clean the thread.