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Strongest rear end- MSM or FC?
So I'll be getting some 3.63's in the future, and while I'm at it I'd like to optimize my differential.
Would getting an FC rear diff cover make it stronger, or getting a MSM rear end with the bigger axles? Eventually I plan on it being a 450whp HPDE car with an OSGilken... well down the road, so I'm wanting the most reliable way I can go. |
A Torsen will handle 400whp...not sure about 450whp. How much rwtq?
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Not sure, it'll be a while before I get to that power level. Probably 350-370wtq, if I estimate correctly.
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Ill let you know how mine holds up in the coming weeks :)
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I know it'll last up to street use, I'm not really worried about that, if I have the OSG... the torsen would be unhappy at that high of a HP at the very least. I'm more worried about breaking off ears or axles.
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In for interested.
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s5 fc rear end good for 400hp :)
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Originally Posted by Reverant
(Post 697387)
A Torsen will handle 400whp...not sure about 450whp. How much rwtq?
Originally Posted by Savington
Blowing the 7" Torsen at Sacramento Raceway, April 26th 2008. Estimated power is approximately 230-235whp.
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Damn. Look at all the violence to that wheelhop. No wonder it broke.
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I've tuned several 230whp+ cars so far, no broken Torsens. What can I say?
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TorSens turn into open diffs. with too much torque (240+) and sticky tires. Even a FC clutch will do this and act liek a on/off switch. Get the OSG.
TorSens hold up pretty good...unless you wheel-hop them to death. |
Have you thought about switching to an 8 inch ring gear setup?
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Originally Posted by Doppelgänger
(Post 709206)
TorSens turn into open diffs. with too much torque (240+) and sticky tires.
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Originally Posted by richyvrlimited
(Post 710112)
How does that work? I'm not disagreeing, I just don't understand how it could happen? The TorSen is a torque biasing differential, the torque is biased through gearing. If there was 'slip' there's be no teeth left?
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So how does it 'become open' then? that's the bit I really don't understand.
If it was a clutch diff I could see the power overwhelming the plates, but with gears? it's either working or it's broken? |
Kinda like how TorSens will go into "open mode" when one wheel is off the ground or one wheel on ice/snow. It's called 'torque bias ratio' and it has to do with how much torque it can divide between both sides. If you load it up with a lot of torque in a situation where you're asking it to split up the difference (in a tight turn), it simply can't do it and sends all the torque to one side...the side with the lease resistance.
The Torsen differential works just like a conventional differential but can lock up if a torque imbalance occurs, the maximum ratio of torque imbalance being defined by the Torque Bias Ratio (TBR).[3] When a Torsen has a 3:1 TBR, that means that one side of the differential can handle up to 75% while the other side would have to only handle 25% of applied torque. During acceleration under asymmetric traction conditions, so long as the higher traction side can handle the higher percentage of applied torque, no relative wheelspin will occur. When the traction difference exceeds the TBR, the slower output side of the differential receives the tractive torque of the faster wheel multiplied by the TBR; any extra torque remaining from applied torque contributes to the angular acceleration of the faster output side of the differential. |
I know they are unpopular in the miata world, but it would be nice to find a spool option that isn't "just weld it lulz".
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OsGiken with MSM axles? = S2000 OS G + msm axles.
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