Over revving issue - Page 4

Speedfreak · 06-04-2009

Regardless if they rotate or not, I'd set them to the locations that the piston manufacturer suggests.. as if you were putting them on for the first time.

**Halon** · 06-04-2009

Got the tranny partially apart. So far nothing has stood out as being an obvious issue, which is good I suppose.

Someone mentioned the Viscous coupling maybe being bad. How can I check that?

Also, after seeing all of this, does anything stand out thus far as being the reason that the car felt like the clutch was slipping really bad? What would have caused that, because the clutch looks to be just fine.

Here's a few pics. I was taking tons of pictures, because when it comes time to put this thing back together, I want some pictures to look at to make sure it's right

**Shane@DBPerformance** · 06-04-2009

Yea, with a non-lsd tranny and a broke axle, the other axle/wheel isn't going to get shit for power sent to it.

4g63tcrazy · 06-04-2009

^^^Beat me to it!

I didn't take the time to read but wouldn't you're snapped axle be the cause of all you're slipping?

**Kracka** · 06-04-2009

While your transmission is apart you should take the opportunity to add a Phantom Grip (or TRE's equivalent called the RIPGRIP).

I had BM Tranny's version of it in my 1G FWD and it actually made a very noticeable difference.

**Kracka** · 06-04-2009

While your transmission is apart you should take the opportunity to add a Phantom Grip (or TRE's equivalent called the RIPGRIP). I had BM Tranny's version of it in my 1G FWD and it actually made a very noticeable difference.

**Halon** · 06-04-2009

Dumb question, but again I'm not a drivetrain guru what-so-ever. How does the broken axle, make the car feel like a slipping clutch. Not just shit for power, but slipping clutch? I would hit it in 1st and the RPM's would just race up, then I'd let off and they'd go back down to the RPM you'd expect them to be at?

**Shane@DBPerformance** · 06-04-2009

Stolen from the interwebs...

A Standard limited slip diff, as fitted to the
majority of cars allows the two driven wheels to rotate at different speeds while delivering the same torque to each wheel. The wheels need to travel at different speeds when the car is cornering as the outside wheel has to travel a greater distance than the inside wheel.

This system works fine in most daily driving situations but this system has faults which will become more apparent on slippery surfaces. For example when driving on snow, one wheel may have little or no traction and hence the torque created is negligible and as the diff
transmits the torque 50/50 between the two wheels, the other wheel gets 50% of next to nothing which is why the car will not move forward.

4g63tcrazy · 06-04-2009

Watch the video's of MAP trying to go 9's (or 10's can't remember) in their blue 1g. They snapped the rear axle twice and the car would just rev up like a slipping clutch would.

**Halon** · 06-04-2009

Quote:

Originally Posted by ecoli

Stolen from the interwebs...

A Standard limited slip diff, as fitted to the
majority of cars allows the two driven wheels to rotate at different speeds while delivering the same torque to each wheel. The wheels need to travel at different speeds when the car is cornering as the outside wheel has to travel a greater distance than the inside wheel.

This system works fine in most daily driving situations but this system has faults which will become more apparent on slippery surfaces. For example when driving on snow, one wheel may have little or no traction and hence the torque created is negligible and as the diff
transmits the torque 50/50 between the two wheels, the other wheel gets 50% of next to nothing which is why the car will not move forward.

So since the one wheel had a snapped axle, it was like the "slipping wheel in snow". So the torque is very little. So the other front wheel also got little to no torque correct? Makes sense.

But what I still don't understand, is the "slipping". What was slipping? It wasn't just that there was no torque, the thing free-revved like a slipping clutch. That is what I don't understand, and wish I understood.

**Kracka** · 06-04-2009

Since the front diff is open, couldn't a lot of the power be sent to the broken axle thereby allowing it to free-rev?

**Halon** · 06-04-2009

But it's AWD, so shouldn't the rear wheels still be spinning normally?

MustGoFaster · 06-04-2009

Nope, AWD= three diff's. One to split front/rear and a front and a rear to split side to side. Same principals apply. 50% of next to nothing = slightly more. Since DSM's have a viscous center LSD, the VCU provides some resistance and allows the car to drive "normally" untill you try and put "a lot" of power to it.

s1ngletracker · 06-06-2009

so all this disassembly, to find out its just a broken axle? ouch. Makes sense though.

viridionplague · 06-06-2009

ok im kinda drunk so this post is iffy at best as ive only read the past 3-4 posts, but i broke an axle recently, the car would rev up pretty easy while in gear, as if it was a bad clutch or something, once i got some good axles in there its back to normal, i broke a read driver side axle and it really seemed wierd after it broke,

i know this because i drove it for a little bit after the axle broke, the axle broke, but didnt actualy leave the rear diff for aboujt 20 minutes, do it drove just fine, (no shakes or anything) for a little while till the axle fully seperated from the carrier.

dont know if that clarrifies anything for you, but that was kind of my experiance

**Goat Blower** · 06-07-2009

I had the output shaft splines going into the xfer case strip slightly and it did the same thing, felt like a slipping clutch. Glad that's all it is for you, btw, that ring compressor is still sitting in my backseat. :-)

**Halon** · 06-08-2009

Quote:

Originally Posted by s1ngletracker

so all this disassembly, to find out its just a broken axle? ouch. Makes sense though.

I wouldn't say that. Again, the head was coming off already, due to suspected head gasket issues. Then while the head was off, figured might as well check out the rod bearings for peace of mind. I didn't like how the #2 bearing was more worn than the others, so I picked up a new set of King bearings from DB on Friday. Plan to put that all back together today after work (so I'm going to be stopping by to pick up that ring compressor steve-o)!

The trans was shipped off Friday to Dogbox out in NJ. He's going to verify everything is OK, and may swap in a known good VC just to be safe, in case there is an issue with mine that we simply can't see.

I should be getting the head back any day now also. So that should be back on by the end of the week. Then just patiently wait for the tranny to come back.

A//// Guy · 06-08-2009

Man that thing is a money pit! lol Good luck with the build. If I were you I woulda have stuck new rings in, since compression seemed a bit lower than it should be.

turbotalon1g · 06-08-2009

Why didn't u contact TRE? i thought they built that tranny for u?

goood luck with getting it back together

**Halon** · 06-08-2009

TRE's site says he's not available for most of June, and that doesn't work for me as I want it back soon so I can be ready for MAP's event on July 10/11. So I sent it elsewhere.