Starting my M54B30 swap...

[Elysian]

Flex discs on driveshafts flex for a reason. To save your driveshaft. There is a reason even modified vettes still run rubber flex discs.

I'd rather replace a $40 guibo than pay $350+ to have my driveshaft rebuilt because my semi-solid flex disc destroyed the u joints.

Link to this happening to others? I've searched a bit already.

[nando]

they've only been around a couple months. I don't think anybody really knows.

interesting product, but not for me..

[Danny]

How exactly is this "incorrect?" Or do you even know?

Alright, you called my bluff. I'm not some automotive engineer, I'm a keyboard warrior. All I know is when I'm redlining the engine and driving 120+ mph on the track, or even 70 mph on the freeway, I need to have the utmost confidence in the setup I have put together. This item just doesn't instill that confidence in me. If you'd like to take the gamble, more power to you. Please report back on what you find. Its just not a chance I'd like to take.

[RobertK]

Kinda funny how some of the 500+ hp vette owners replace their stock flex discs with BMW ones.

http://forums.corvetteforum.com/c5-t...couplings.html

[Elysian]

Alright, you called my bluff. I'm not some automotive engineer, I'm a keyboard warrior. All I know is when I'm redlining the engine and driving 120+ mph on the track, or even 70 mph on the freeway, I need to have the utmost confidence in the setup I have put together. This item just doesn't instill that confidence in me. If you'd like to take the gamble, more power to you. Please report back on what you find. Its just not a chance I'd like to take.

I have a hard time grasping how you trust rubber more than aluminum+poly. I'm also not an automotive engineer but I have had a flex disc sheer on me, on the completely stock 01 330ci that is providing the donor motor for this swap. It was not a fun experience, and I've seen other people have the same thing happen on their vehicles. I'm certain the chance of this sheering versus the chance of a flex disc sheering is FAR lower, plus the fact I'm not going to be pushing a hell of a lot of torque to begin with. I just fail to see the problem here.

Also, AFAIK this isn't even the first aluminum replacement flex disc, it's not like it's new technology. It's actually something I wanted when I sheered my 330ci's flex disc, but I didn't bother to look into it since the place I bought the car from replaced the one that sheered for free.

I'm also not worried about U-Joints, as the entire drivetrain is going to be held in with urethane mounts, including rear subframe mounts, so movement is not going to be a huge issue.

And I'll be further honest, I highly doubt this car ever sees a track besides perhaps the drag strip just to see what it's got, nor will I be doing 120+ on the street, I'm past that phase at this point in my life. I'm building it for my own enjoyment, I'm not loaded enough to build it as a dedicated track car.

[Elysian]

http://www.e30tech.com/forum/showpost.php?p=1157870&postcount=33

Here's some good reading on the subject.

[Elysian]

Kinda funny how some of the 500+ hp vette owners replace their stock flex discs with BMW ones.

http://forums.corvetteforum.com/c5-t...couplings.html

One of the first posts in that thread:

http://forums.corvetteforum.com/1572332713-post9.html

Great thread!

Since when did Gm start offering these couplers for sale?

The two times i did my shaft they did not sell the couplers by themselves.

I used the softer BMW ones and tore them apart and then I went with dual solid from LG motorsports, which gave me an annoying rattle at 650 rpms.

And this is what he went with:

http://www.lgmotorsports.com/Driveshaft-Coupler

[monster89]

Dang m54 this car is going to be sweet keep up date

[Danny]

I think you're misunderstanding me, friend. The poly vs rubber argument is as old as these cars and we all have differing opinions. I'm concerned about the shape of the unit itself and how it will react when spinning at multiple thousands of revolutions per minute. I would be concerned with the balance and whether it will cause any harsh vibrations.

[Elysian]

I think you're misunderstanding me, friend. The poly vs rubber argument is as old as these cars and we all have differing opinions. I'm concerned about the shape of the unit itself and how it will react when spinning at multiple thousands of revolutions per minute. I would be concerned with the balance and whether it will cause any harsh vibrations.

If it's balanced around an axis and symmetrical what exactly is the issue?

[Danny]

That's just it, maybe the picture is misleading but, it sure doesn't look symmetrical to me. The bottom "ear" for lack of a better term seems to be much further away from center than the rest of the ears.

[Elysian]

That's just it, maybe the picture is misleading but, it sure doesn't look symmetrical to me. The bottom "ear" for lack of a better term seems to be much further away from center than the rest of the ears.

And you think a company would seriously release something so off-centered like that? I don't know what to say to that, it's ludicrous. I

[hwy84]

And you think a company would seriously release something so off-centered like that? I don't know what to say to that, it's ludicrous. I

Uh-oh. He got so pissed he had a heart attack in the middle of typing.

":curse:...It's ludicrious. I... <thump>"

[Elysian]

Uh-oh. He got so pissed he had a heart attack in the middle of typing.

":curse:...It's ludicrious. I... <thump>"

:rofl: I'm on my tablet, typos occur

[hoveringuy]

That's just it, maybe the picture is misleading but, it sure doesn't look symmetrical to me. The bottom "ear" for lack of a better term seems to be much further away from center than the rest of the ears.

It's two triangles of different sizes. It's perfectly symmetrical around the center. I think it will work fine.