Thought I would open a new thread to let the Speed6ers know SU is the first to deliver one of these diff mounts. I have no vested interest in SU, but they always deliver for me....YMMV

nice, im ordering

Man that is one ugly bastard, but it is big.

That's a fact Jack. I will be breaking the edges (an engineering term for those so inclined who may be reading) and painting black before installation.

hey whoosh, thanks for getting everyone's ass in gear when you made your own lol

your welcome

Yeah, what he said.... Huh?

Yea, sorry about the loks of it. But it works, trust me I have the first one.

the next batches will definitely look a lot nicer. We just had so many people calling we just got the first batch to the first that pre-ordered.

hey whoosh, thanks for getting everyone's ass in gear when you made your own

were there ever any pictures posted of it?

Pics on msforums. Speed6 engine/drivetrain section.

can we settle the roumer of being able to do this on jack stands?

I sent SU an email and ending up ordering mine right after you posted the first time in the wotbox thread Forzda. Thanks for helping me spend my money some more.

I know whoosh said he did his on ramps

i did the prototype install on jackstands. make sure you have extra. i had to use them to support the dif.

Here's a couple of photos after a bit of cleanup and paint. Not outstanding, but a bit better looking. It will be pretty much unviewable when installed and I really just want no rust...

i think i will hold out for the whoosh mount

How thick is this thing supposed to be? Whoosh's mount is 3/8" thick.

not that it's a bad thing but the SU mount in the picture was certainly cut with a torch which is why there are no specs on it.
ususally when you can say "water jet" billet this or that you do but this is just a down and dirty slab of metal with bushings
again, not ness a bad thing.

my mount is 5/8" thick steel
not sure about the SU thickness although it looks comparable....

The SU mount is 16.3mm with the paint. Just a tick over the 5/8". It is pretty heavy at ~6 lbs. I think the choice would be based on asthetics and price as I don't see any way to design differently unless you went with exotic base materials... Structurally, a flat piece of steel is a piece of steel... Maybe use a thicker piece of tubing stock for the bushing mounts? The cut edges do show some stryations looking pretty much like cut with a heat source like a torch. Machine cut none-the-less. I'll be installing mine one day soon... when I get the time...

can we get an updated ETA from you whoosh?

My bad, I thought I saw that yours was 3/8" thick.

So, does anybody who's received the SU brace have the TT bushings sitting around to compare sizes to? I'm curious if the final product might be able to house the TT bushings.

I have the extra bushings, but have not received a tracking number for my StiffDiff yet. Figures since a guy local to me ordered after me and got his tracking number. If no one beats me to it, I'll post bushing sizes between the two. I'm guessing they are the same, but you never know.

well wether guys go for whoosh's mount or the su mount both will be way better than the stock cast mount

I finally drive my car with my SU mount installed (paired with the TT mount too). There was a little bit of vibration at lower speeds but I knew it was coming because there is no play in the rear diff anymore. Hopefully this will stop my run of broken axles... only time will tell

The bushings are not interchangeable. SU uses a smaller diameter piece of pipe for the round sections so the bushings have a smaller diameter as you can see in the pics. Interesting is the fact that the width of the internal part of the TT bushings is the same as the SU piping. That means that not only are the SU bushings not solid as seen in the pic, they are not wide enough so there will be a gap internal in the housing.

more pics of the thinwall piping and the bushing difference.

Interesting. That's the exact same problem AWR had with the trans mounts when those came out. They were undersized and walking out within weeks of installing them. They sent out redesigned bushings, inner sleeves, and spacers/washers for the void. That was a group buy catastrophy, saved by thegreatny's constant communication with Tony over there.

wow you would think su would have thought of that

The stiffdiff is not designed to use TT bushings. I will be very surprised if anyone can break our stiff diff, give it your best shot guys!

Does that mean that we'll get free ones when we do? lol

oh my....a 2 piece bushing?

did you mention the width of the bushing spacer is more narrow than the frame mounting point?

how much more narrow?

wow im not gona lie im really disappointed with SU after those picts. why is it so thin? wtf is with the multi-piece bushings?




whoosh, this is the part where u come out with your REAL rear diff mount that everyone wants to buy including me. thanks SU but ill be waiting for whoosh's


EDIT: for comparison....

+1 I want to be putting some extreme torque through my diff next year. I don't want half a bushing walking out on me.

Thanks for the pic of Whoosh's. It certainly looks nicer than SU's, and, it looks like it uses the TT bushings. I've already installed my TT bushings in my stocker, so, I may have to get another set of TT bushings. But, that's okay. Whoosh's looks like da shit.

speedie cant u just uninstall them? or is that a nono when it comes to bushings?

Not sure. They are pressed in, and I wasn't completely sure how they would be after being pressed in, then out, then in again. So, I figure it may be safer to just get some new bushings.

Two piece bushings like these, while imo they are garbage, don't generally walk anywhere because they should be held in place by another bracket on either side of them. The gap in the middle, while it is a bad design, isn't actually really used for anything since the torque load is going to be placed on the outer edge of the bushing.

The thin wall piping shouldn't be breakable imo, but with enough power and a soft crushable bushing you *might* be able to deform it. EDIT: Now that I think about it, the smaller diameter piping may eliminate any deformation.

I still think this is a solid mount that isn't going to go anywhere.

Having said that I think alot of us would rather build it one time and have it be able to withstand a nuclear holocaust intact.



Unless they get cut or torn they will still be good.

Basically, this makes sense and is probably correct. That the SU mount is probably more than good enough. Yet, if Whoosh's is even better, well, might as well get the best.

Explain this then (post 511 and on)...

http://forum.mazda6club.com/index.php?show...1220&st=500



Having a smaller diameter also moves the location of the bolts down by half the difference. That might not be savy either.

Just my $0.02.

Not to offend SU I love the shop and have purchased many thing from them without complains, but this mount look like something i can do myself with 0 welding skills...

Yeah I saw that, I think its apples and oranges though. I don't think that the rear diff mount has the same rotating type force to contend with. The only problem I can see if that if the bushing is sufficiently soft, it could be crushed and deformed enough that the diff housing could come out of alignment and create some vibration problems that didn't exist before. I think that is really remote though considering that I don't think that the mount shift over more than 1/2" or so from its centerline.




I don't think that shifting the diff housing up by ~1/4" is going to effect anything. Worst case it might slightly stress the housing because the front mount will not be shifted up by the same amount, but since it is only 1/4" or so, that difference can probably be absorbed by the bushings or any slop inherent in the mounting system.

The bushing spacer isn't more narrow. It's the same width as the TT one. It fits perfectly into the holders up in the car. I don't think the bushings halves will walk out either. They are tight up in the two mounts. Guess we'll see with time. I installed all the mounts and the Whiteline swaybar today. Took 4 hours total to do it. Pulled a wicked 4 wheel burnout/drift out of my friends street onto the main road. Rear end feels nice and solid. No noise coming from it either. I did have to adjust my gastank a bit to the drivers side because it was right against the TT front mount when I first put it in and started tightening things up. I have to agree that, while I'm not overly impressed with the SU unit especially compared to Whoosh's, I don't think it will give you any service issues. I think you'll break something else before these mounts now.

Hey guys, NHRA Pro Stock race cars are built using .83 thou wall thickness tubing. Our stiff diffs are using .125 thou wall thickness. Our stiff diffs are rated for 800+ rwhp and comes with a unconditional lifetime warranty including the polyurethane. I highly doubt anyone of us are hitting those numbers... yet ;-)

Also the first few stiffdiffs on the market now are the final prototype design, not the production run. Production run units are shipping today, both units will do exactly what is needed, just look a little different. I am out of town until tuesday...

Yeah, I have no doubts about the strength or longevity of my SU mount. I indeed have one of the prototypes and it likely isn't as pretty as a production model, but I'm not complaining (>$). It isn't too often that I crawl under the car to check out the shine on the upper diff mount. I do wipe down the jewel-like 80mm CS polished exhaust though...

Decimal place misplaced in there somewhere?




I guess you meant "Our stiff diffs..." Not trying to be anal, its just that it actually took me a minute to try to figure out what the heck you were saying.



Some tuner magazine had an article about 1000 HP Evos. They had 3 contestants. IIRC, one actually hit the 1k HP mark, while the other two were close. I don't know what they hell they did to them to get 1k HP. But, if they can do it, why not us?



On one hand, I suspect your product is more than good enough. And yet, if Whoosh's is even better, well, I'm tempted to go that way.

Seriously, what the hell took so long on these? Its a plate, with welded on bushing sleeves, and of course the bushings themselves. I don't understand what could take so long to make such a part.

SPeak of the devil... what's going on with whoosh's diff mount?

Well guys... I just want to come out and say I that just torture tested the SU mount and it passed. I ran 9 runs today at the track and tied the fastest (proven with slip) 60 foot time- 1.71. To give you a little history, I have been through 5 axles and two upper diff mounts. I even managed to break a upper diff mount (that was 2 weeks old) and an axle with the turbine tech diff mount installed. So, I don't think that you are going to have to worry about a thing with this mount, just as Cullen said.

a 1.71 60' is the fastest time for what?

It is the first 60 feet of the quarter mile.... it is a way to tell how much you are actually launching the car...

"60 foot time- 1.71"

What was your more consistent time? Just curious because before I had this mount I had some horrible 60' times and haven't been back yet, but I have done some street launches and it just goes now.