Question about engine/tranny mounts w/ m30

[Andy.B]

I have an 87 325i that I m30 swapped last year that keeps eating giubo's.
It's an m30b34 bolted in with Q-Bang mounts and stock m20 bushings up front.
The transmission is a g265 supported with an m3 transmission brace and poly bushings.
The driveshaft was shortened/reman'd by driveshaftspecialist.

It has destroyed two oem giubos in a year. Both giubos were installed what I believe to be the correct orientation (with the arrows facing the flanges they are attached to). The CSB is still intact. I'd like to believe that the engine is just too powerful for a mortal giubo, but I don't think I can pin it on a stock m30b34.

Do I have an incorrect combo of parts on this swap? Does anybody have any experience with frequently failing giubos? Any thoughts?

[Andy.B]

Actually... I may have discovered something.
Every picture I've seen of aftermarket giubos looks like the arrows are backwards of the oem ones. Which would explain why they failed so fast.

[SketchyRex]

Why aren't you running m20 poly mounts on the motor?

[jim325]

I also have this problem. And not to upset you but I haven't fully found a solution to the problem. I have e30.de mounts with akg pily engine and Trans mounts. A rebuilt stock 325i driveshaft and I just ordered a new Trans output flange. Mine is actually bent but I honestly don't think that is the root cause, just a symptom.

I have tried loosening the nut that holds the 2 piece driveshaft together and getting the front as close to the output flange as possible, so its lightly touching it, then bolting everything up. Doesn't seem to help. I'm hoping this output flange will make the guibo and the bolts last at least a year at a time instead of 4-7 months.

I might try switching from damn near solid to rubber engine and Trans mounts.

If you can find an answer to the root cause of this please let me know. It seems out of all the people that have done this swap we are the only 2 that have this problem.

[jim325]

Also, if you order a guibo, at least the ones I have ordered, they have 2 sets of arrows facing in opposite directions. Good luck figuring out the right arrows.

[Andy.B]

Why aren't you running m20 poly mounts on the motor?

I'm running rubber up front because I already had a pair on new ones on hand when I did the swap. Meanwhile, it was much more economical to buy poly m3 mounts than rubber m3 mounts.

While I am sure having them mismatched isn't ideal, this car is not driven hard, and is used as a commuter.

[e30m3s54turbo]

I had the same problem 17 years ago with my guibo and my e24 rubber engine mounts. My buddy suggested to to use a 6 cylinder 1986 Jaguar rubber mounts. They are a 1/2 shorter than a e30 325i rubber mounts. They are triple plated and stiff. The guibo I was using was off my e30 m3. It would only last me 8 months. A other friend suggested to use a e34 540i guibo. If I remember it is at least a 1/4 or 1/2 thinker. I have had it the the car for 14 years. No problems. My swap is a (m88) s38 +300hp 300tq.

[Andy.B]

And that's another giubo gone.

This time, however, the bolts for the motor mount on the pass side sheared, so I don't know what to blame.

To play it safe, I am going to be replacing it with a lemforder giubo, an oem centering sleeve for the driveshaft, and I'm going to try my luck with jaguar mounts as suggested above.

[Doughnut]

Does your shaft sit square against the guibo or does it look like this:



It is important that your guibo is parallel, any load horizontal or vertical will chew the rubber out.

I spaced my transmission accordingly to achieve a parallel fit.

[Mr. Burns]

And that's another giubo gone.

This time, however, the bolts for the motor mount on the pass side sheared, so I don't know what to blame.

To play it safe, I am going to be replacing it with a lemforder giubo, an oem centering sleeve for the driveshaft, and I'm going to try my luck with jaguar mounts as suggested above.

I'm often wondering if my M30swap is doing the same thing.
I'm on my original swap guibo (maybe 1000miles) however, I can often feel the car "surge"..I guess it's the only word I can think to describe the feeling.
it's not a performance from the engine feeling, but more transitional from the drivetrain...and i'm really wondering if it's the beginning of the end of my guibo.

did yours offer any tell tale signs of a this failing part for the 3rd/4th time?

[Mr. Burns]

Does your shaft sit square against the guibo or does it look like this:



It is important that your guibo is parallel, any load horizontal or vertical will chew the rubber out.

I spaced my transmission accordingly to achieve a parallel fit.

provided you seated the engine properly on whichever engine mounts you use, this couldn't be an issue no?

[TimeMachinE30]

And so I wonder, use OEM M20 mounts and OEM trans mounts or do I go poly? I want a smooth ride, free of much NVH.

[Mr. Burns]

And so I wonder, use OEM M20 mounts and OEM trans mounts or do I go poly? I want a smooth ride, free of much NVH.

I would highly recommend G-Man Visionary mounts (if he still makes them)
I get a little dashboard vibrations at idle, but when motoring super smooth.
the vibrations could simple be that my ie headers are so close to the garagistic engine mounts, and have absolutely nothing to do with the poly mounts.

[TimeMachinE30]

Recall their rating? 95A..?

[Mr. Burns]

Recall their rating? 95A..?

I *think* they're 90A...don't quote me on that.

all info here--> http://www.r3vlimited.com/board/show...ght=streetable