I disagree on 50% torque going to the rear. With a fully locked diff, the front tires will have less weight on them on a launch. If wheel speed is to remain the same, and 70% of the weight is on the rear tires in a launch, then ~70% of the torque is going to the rear. This isn't entirely true as grip vs. load isn't linear, but it is proportional.

Besides, the DSM guys have already blown up carbon driveshafts. They aren't unbreakable.


As for speed, have you been drinking?
25.3" tire diameter and 200mph
That is a tire speed of 2657 RPM
The rear diff is a 3.307:1 gear ratio, which means a driveshaft speed of 8787 RPM...

The final drive ratio is not the rear diff ratio. The rear diff is 3.307:1. When you multiply in the transfer case ratio, it all works out though.


Again, though, I'm not saying this driveshaft isn't potentially awesome. It's just a long shaft and preventing vibration and resonance seems like it would be very difficult.

 

it's real simple;if you don't like carbon fiber drive shafts,then don't buy one.i started this thread b/c i thought some guys would be interested to see how much they weigh and how they fit and etc.

2800ft-lb driveshaft strength does not equal 700ft-lb at the crank,sorry.you can spin it anyway you want and you're still wrong.

start your own steel driveshaft thread and stop double posting your BS speculation in mine.

 

Just so you know, you're talking to a guy with a MS in ME... so maybe you should take your quoted bull**** and try and pull it over someone elses head.

 

I've got nothing against the carbon shaft at all. I love the idea because it is light. I'm ALL FOR lightweight parts that work.

I just don't believe a company that says it has no shaft speed limits without some further explanation. Also, it seems like they made you believe it's unbreakable, when I can show you videos of carbon driveshafts blowing apart leaving shards of carbon stuck in the pavement.

How does being slightly more informed on the physical limitations of a design and asking for more data make me a bad person???

As for speculation, I'm not the one saying the final drive ratio is the same as the rear diff ratio...

 

well i guess he can't be wrong then.

so you agree that 700ft-lb crank translates to 2800ft-lb at the drive shaft?wow.

i'm not trying to pull anything over anyone.i just bought a drive shaft,started a thread for install pics,and you start saying it won't fit and frank says it isn't reasonable.


how did you figure that,i never said anything like that.i said they tested it at 2800ft-lb and it help up fine.

you said,"700ft-lb at the crank is equal to 2800ft-lb at the driveshaft" and then myself and some other people disagreed because obviously the torque is split on the EVO since it's 4WD.

id didn't say that either,maybe i mis-poke or you misunderstood,but the driveshaft is between the transfer case and the diff.the driveshaft powers the rear diff.the transmission final drive is 4.5.i would think the transmission has more effect on the DS than the rear diff.

so much for making a thread about my new drive shaft and the install.i still can't figure where all this animosity towards a drive shaft came from.do you guys have some experience with PST or something?

i'll just end this thread right here.this wasn't what i had in mind when i started the thread.

you guys can start a new thread about how weak the PST driveshaft is and how it doesn't fit and '03white's degrees in engineering.

 

You are right...
You bought the greatest thing in the world and we should all marvel at it.

If you want to post pictures and have a circle jerk, put it in the show and shine section. If you want to show how to install it, maybe put it in the how-to section. If you want to discuse technical specifics of a part, maybe put it in the...oh, I don't know..."Evo Engine / Turbo / Drivetrain" section.

OH ****! That's where it is at...
It's the internet, expect people to post opinions about it.

 

i knew you'd figure it out.

 

Haha. Spot on.

 

well, since op isnt posting pictures. for reference right???

 

THIS. THIS!! Realize this.




Also, very curious if shaft is uni directional, which I doubt by maybe, or if it is cross plied and quasi isotropic.
What is the core made out of? Composite honeycomb??
Some graphite/epoxy structures can have tensile strengths of 300,000PSI, wouldn't be too concerned about breaking this due to torque if it was engineered....

 

 

My concern is taking a 3 piece drive shaft system w/all the articulation points & converting to a 2 point single shaft

Mitsubishi designed the shaft system to be compliant w/ all the suspension & engine movement

Good thread topic

 

Freaking awesome!

 

i'm keen to buy this, how's the install photos ?

 

PHOTOS...?