So I recently got the freshly rebuilt motor back in the car and its back on the road. However, the motor has a bit too much play and likes to jerk back and forth and move around, even after replacing the 2 side engine mounts with brand new factory ones. I know I could have gone with urethane replacements for more stiffness, but that wasnt in my budget.

I was wondering what everyone is doing to remedy this? Im sure its somewhat of a common problem on these cars. Is anyone running some form of transmission mount or brace? I'm aware of the one a-spec tuning sells which is a straight forward metal brace. http://www.a-spectuning.com/html/pro...rans_brace.htm

Seems like it would fix the problem, however im not sure i like the idea of having the transmission bolted to the bottom of my car without having any sort of bushing or play. Wouldn't this create more unnecessary stress on the transmission and/or other parts of the car? Ive been searching around for a few days now and couldnt find an answer to my issue other than people going with these full on steel braces. Any feedback would be great guys, need to fix this slop!

 

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/diy-transmission-brace-729730/

 

did you even read my post?
im very aware of that thread, and it does not answer any of my questions.

 

Our Poly mounts and one of our Diff Braces eliminates vitually all shifter/trans movement without the harshness of bolting the trans directly to the car.

Mounts http://www.banzai-racing.com/polyfd_motor_mounts.htm

Diff brace http://www.banzai-racing.com/products_diff_brace.htm

 

Thanks banzai,
I was originally going to go with some of your mounts, i didnt have the funds at the time and now i really regret not going through with them. I will probably be contacting you shortly.

 

Sorry to disappoint. I didn't answer any of your questions. You asked:

1) I was wondering what everyone is doing to remedy this?
2) Is anyone running some form of transmission mount or brace?
3) Wouldn't this create more unnecessary stress on the transmission and/or other parts of the car?

All three of those issues were touched on in the thread, which was the reason I pointed you towards it. You mentioned that were familiar with the brace from a-spec tuning, you never mentioned you were familiar with the one that Badddrx7 is making. Since he had 6 left at the time, I thought there was a chance that you may not be aware of it, may read the thread, and might even decide to pick one up while you still had the chance.

You also wrote:
"Any feedback would be great guys, need to fix this slop!"

I guess you really meant to say:
"Only reply if you have a definite answer for me."

Of course, it probably took you all of 5 seconds to check the link I gave you, realize you had seen it before, and gone on with your life. You must be a very busy and important man indeed to get pissy over 5 seconds.

 

goreify - I'll give you some past discussion points on the matter of solid mounts. This goes all the way back to the digest days of later 90's on the FD. I have not seen anyone sucessfully mount a diffrential or transmission brace with bushings nor carry on a long thread about the fact. It's been talked about briefly, but thats it. Look at the oem diffrential bushings. When they go out and the clunking starts almost everyone goes with an aftermarket solid bushing. This cures the problem but presents a little more noise transmitted to the cockpit. Now this is just an example of what I'm getting at - solid urethane mounts plant the motor more firmly on the subframe - solid diff mounts plants the carrier assembly more firmly on the rear subframe - and steel diff/trans mounts plants the whole driveline more firmly on the unibody. Those clunks, cracks, exploding carriers, etc go away. But you don't like that.

I'm talking using these mods alongside horsepower modifications. Staying with a stocker, generally you don't need to do all of this. Just replace the parts with new OEM bushings/mounts.

I have been running the diffrential, transmission and diffrential girdle on my three FDs for some time now ( on the red 93 for 6 years ) and although there is an acceptable level of noise ( noise as in I can faintly hear the transmission/diffrential gears meshing ), I have NOT seen any of fatigue related issues at my present 400HP single turbo application.

So to sum it all up - if you have a rebuilt motor and it has a "bit too much play" to suit you then I would look into why it's shaking. Check the tune, troubleshoot for root cause of the shake and not worry about having the transmission bolted to the bottom of your car.


Later