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-   -   How much can stock drive shaft handle?? (https://www.ft86club.com/forums/showthread.php?t=38013)

Argento_FR-S 05-31-2013 03:37 PM
How much can stock drive shaft handle??
 
I am working on going FI, and since my clutch is overkill for my short-term power goals, I'm curious as to what will go first... The drive shaft, the differential, or the axles? Anyone pushed these items to the breaking point yet? Just curious about whether I should save up for FBM's 8.8 conversion now or if it can wait... Much appreciated!

Since I know everyone will ask... my short-term goals are ~250whp/~250wtq

My eventual goal is looking closer to maxing out the FX400's torque rating.

nonicname 05-31-2013 04:35 PM
you'll never get anything close to torque numbers close to HP numbers.
maybe if you change compression ratio but even so I doubt it.

people are pushing 600whp and a few people have blown engines at low power levels.

http://www.ft86club.com/forums/showthread.php?t=34073

Argento_FR-S 05-31-2013 04:46 PM
I appreciate the doubt, but my question is to find out if the stock components can handle those numbers somewhat reliably. Granted I know that s**t happens, and that I'm taking chances no matter what when I mod. Just hoping to get a ball park of just how big the risk of breakage is.

Thanks

Draco-REX 05-31-2013 04:59 PM
Not enough time has passed to say "This can only hold X hp." "That can only hlad Y Hp." Right now it seems the stock driveshaft can handle moderate bumps in power. "Stage 1" turbo kits seem to be fine. But I don't think I've seen anyone destroy the stock DS yet, so it could mean that it's good to very large amounts of power.

The cars just haven't been around long enough to get a good grip on the limits of the individual components.

Mobius357 05-31-2013 06:14 PM
Maybe someone swapping for a CF shaft could offer up their stock shaft for destructive testing?

Rayme 05-31-2013 07:11 PM
More than the V6 Mustang's driveshaft

scraejtp 05-31-2013 08:49 PM
Quote:
Originally Posted by Mobius357 (Post 973368)
Maybe someone swapping for a CF shaft could offer up their stock shaft for destructive testing?

Doubtful since a DS failure is usually destructive in nature.

BongMan 05-31-2013 11:59 PM
I don't know if anyone has gotten to the point of breaking the drive shaft. I think Crawford need a clutch and some cv joints around 475 torque. See the video at 3 mins.

[ame="http://www.youtube.com/watch?v=oLP-HCcX9as"]The 450 HP Crawford Performance Turbo BRZ - TUNED - YouTube[/ame]

EZWood 06-01-2013 12:06 AM
Quote:
Originally Posted by Argento_FR-S (Post 972913)
I am working on going FI, and since my clutch is overkill for my short-term power goals, I'm curious as to what will go first... The drive shaft, the differential, or the axles? Anyone pushed these items to the breaking point yet? Just curious about whether I should save up for FBM's 8.8 conversion now or if it can wait... Much appreciated!

Since I know everyone will ask... my short-term goals are ~250whp/~250wtq

My eventual goal is looking closer to maxing out the FX400's torque rating.
scion/Toyota/Subaru have been selling these cars for about a year, that is not a sufficient time to conclusively say that any hp/tq numbers are safe.
Have a nice day :thumbup:

continuecrushing 06-01-2013 07:11 AM
Quote:
Originally Posted by ottopilot (Post 973485)
More than the V6 Mustang's driveshaft
That's not saying too much lol

wparsons 06-01-2013 09:27 AM
Quote:
Originally Posted by Argento_FR-S (Post 973121)
I appreciate the doubt, but my question is to find out if the stock components can handle those numbers somewhat reliably. Granted I know that s**t happens, and that I'm taking chances no matter what when I mod. Just hoping to get a ball park of just how big the risk of breakage is.

Thanks
He wasn't saying you can't hit 250 or 250lb/ft, the point was that on a stock engine you'll have far less than 250lb/ft of torque at 250hp, or way more than 250hp if you it 250lb/ft.

With the high compression ratio and redline where it is it'll make more hp than torque every time. (hp = (tq * rpm) / 5252)

The crawford car makes more torque because of the much lower compression ratio and size of the turbo.

Argento_FR-S 06-01-2013 03:15 PM
Yeah... I know that I won't hit those numbers at the same rpm, but I never said that I would. This doesn't mean that I won't have peak numbers of 250/250 on the same dyno plot.

I guess I'll just have to find the breaking points the hard way...

Sellout 06-01-2013 03:43 PM
Quote:
Originally Posted by Argento_FR-S (Post 974936)
Yeah... I know that I won't hit those numbers at the same rpm, but I never said that I would. This doesn't mean that I won't have peak numbers of 250/250 on the same dyno plot.

I guess I'll just have to find the breaking points the hard way...
Good way to make equal torque and HP numbers on a 4cyl is to use a tiny turbo and spike the boost high early, tapering to nearly nothing by redline. Good luck with that.

jamesm 06-01-2013 04:04 PM
if you make the same hp as you make torque at peak, that means your car is losing power (or at best flat lining) from 5252rpm to redline. then you end up with a car that feels like it has a truck engine, like a wrx. much better to have a more exciting top end, imho.


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