What good is a Phat/omega input if you pop the intermediate?

[Joesixpack]

I had planned the next time I broke a input I'd go to one of the larger shafts.

After finding the intermediate was the shaft to take a dump I'm questioning what's the point....if then next weak link is just as weak....LOL

The input does have a little twist to it,....(like they always do when I pull it)....LOL


Got a lucky break anyways...broke inside the planetary's sun gear, totally contained.

 

[RJM06590]

How do the clutches look? I know in the other thread you said you put it through a good bit of high hp hell haha.

 

[Joesixpack]

For sure, not faulting the trans, poor bastard took it like a champ. Not into the clutches yet but I did burn a set a while back pretty good, in fact ATF couldn't hold it and changed it out to hydral/trans and they had lots of grip again.

Just looking at all options now. NAPC has a regular sized input that overpowered a billet intermediate, so with that it seems like a waste to throw $$ at a larger input only to end up with the same final torque the intermediate pukes.
GRANTED this is NICE gradual loading, so the input is not seeing any kind of shock load....where as full power locked shifts for example I suppose the input is the first to get the hammer and more likely to break I suppose.


With total control over the tune I can clip torque to what ever level I choose.....I guess I have my level with the current trans.

 

[zstroken]

For sure, not faulting the trans, poor bastard took it like a champ. Not into the clutches yet but I did burn a set a while back pretty good, in fact ATF couldn't hold it and changed it out to hydral/trans and they had lots of grip again.

Just looking at all options now. NAPC has a regular sized input that overpowered a billet intermediate, so with that it seems like a waste to throw $$ at a larger input only to end up with the same final torque the intermediate pukes.
GRANTED this is NICE gradual loading, so the input is not seeing any kind of shock load....where as full power locked shifts for example I suppose the input is the first to get the hammer and more likely to break I suppose.


With total control over the tune I can clip torque to what ever level I choose.....I guess I have my level with the current trans.

Wonder if the thicker fluid could perhaps give you a bind up issue on a 2-3 shift?
What gear were you in when it blew? Direct/OD?

 

[Joesixpack]

OD. Actually the the shifting was the best it ever was with the thicker fluid. With the atf there was a little flare if anything.

The last time I put this much to it, it burned out the overdrive clutches, (on atf).....that would be the best engineered solution right....leave the clutches the weakest link.

With the hyd/trans the clutches would hold considerably more.

 

[RJM06590]

Are you using any special hyd fluid? I hadnt heard of that trick until recently.

 

[zstroken]

OD. Actually the the shifting was the best it ever was with the thicker fluid. With the atf there was a little flare if anything.

The last time I put this much to it, it burned out the overdrive clutches, (on atf).....that would be the best engineered solution right....leave the clutches the weakest link.

With the hyd/trans the clutches would hold considerably more.

Well the slight flare meant there wasn't a bindup before, and the elimination of the flare did show that the shift timing was change a little. Just thinking out loud.

 

[bdp]

Did you make a run with it already locked in OD or did it shift to OD during the run? If it was already in OD then that pretty much rules out clutch bind.

 

[Joesixpack]

Well the slight flare meant there wasn't a bindup before, and the elimination of the flare did show that the shift timing was change a little. Just thinking out loud.

For sure, your right the viscosity difference did effect the shift, but IMO in a positive way, I'd call it a perfect shift. It did have a little bit of flare that I kind of always hated. With the thicker oil its much more seamless and no detectable laboring.

 

[Big Blue24]

Are you using any special hyd fluid? I hadnt heard of that trick until recently.

John Deere Hy-Gard, Case Hy-Trans, Cat ????, Oreilly's Universal Tractor Fluid, etc, etc.

Hydraulic fluid flat-out has more bite on the clutches.

 

[Joesixpack]

Did you make a run with it already locked in OD or did it shift to OD during the run? If it was already in OD then that pretty much rules out clutch bind.

Right.....the runs always begin in OD.....BUT there were a few times that it downshifted into direct when I gave it to much happy peddle at the start.......I wouldn't think a downshift would spike like an upshift though. Going from a high torque low speed to low torque high speed.

John Deere Hy-Gard, Case Hy-Trans, Cat ????, Oreilly's Universal Tractor Fluid, etc, etc.

Hydraulic fluid flat-out has more bite on the clutches.

Winter weight was in the sump. More bite for sure.

 

[zstroken]

Did you make a run with it already locked in OD or did it shift to OD during the run? If it was already in OD then that pretty much rules out clutch bind.

Come on, how many times have we heard, "I was just driving down the road and pop there went the input shaft, I wasn't getting on it at all"
"What about the 25psi launch you did last week"
"Well it didn't break then"

LOL

Could have been binding a little, and weakened the shaft, then a nice solid dyno run, and POW!