*NEW* Tubular Diff Brace for FD Rx-7
12-17-09, 11:27 AM
#1
*NEW* Tubular Diff Brace for FD Rx-7
After building a few of these tubular diff braces for customer cars, we thought others might be interested as well. This part is virtually indestructible. Not only is it 3lbs lighter than the KG parts brace, but easily 3x the strength. Total weight is 9lbs. It is even strong enough to be used by itself without the Power Plant Frame. The exhaust hanger will need to be moved to the other side. Otherwise a direct bolt on.
If I get at least 5 people interested the price will be $375
If we get 10 people interested the price will be $350
We will paint it any color you desire. Default paint will be black unless a different color is requested.
I will get pics of it on a car soon
If I get at least 5 people interested the price will be $375
If we get 10 people interested the price will be $350
We will paint it any color you desire. Default paint will be black unless a different color is requested.
I will get pics of it on a car soon
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01-31-10, 07:37 PM
#13
Questions regarding:
1: Vibration transfer into cabin?
2. Whats the design benefit yours has over say that brace that's built by the company starting with a "B"
3. It mounts further away from the diff instead of the closer mount holes possible to use. Wouldn't using the closer holes to the diff eliminate more movement?
1: Vibration transfer into cabin?
2. Whats the design benefit yours has over say that brace that's built by the company starting with a "B"
3. It mounts further away from the diff instead of the closer mount holes possible to use. Wouldn't using the closer holes to the diff eliminate more movement?
02-01-10, 12:25 AM
#14
Questions regarding:
1: Vibration transfer into cabin?
2. Whats the design benefit yours has over say that brace that's built by the company starting with a "B"
3. It mounts further away from the diff instead of the closer mount holes possible to use. Wouldn't using the closer holes to the diff eliminate more movement?
1: Vibration transfer into cabin?
2. Whats the design benefit yours has over say that brace that's built by the company starting with a "B"
3. It mounts further away from the diff instead of the closer mount holes possible to use. Wouldn't using the closer holes to the diff eliminate more movement?
2) strength. twin DOM 1.5" .090" wall thickness tubes are extremely strong.
3) Its all about leverage. The further the diff brace mounts, the less force will be applied to the OEM brace mounts. Which as one can figure, they were not designed to take massive forces. With our design all the stress is placed on the twin tubes and not nearly as much on the oem mounts. The twin tubes don't mind taking up the slack
02-01-10, 09:08 PM
#15
1)
3) Its all about leverage. The further the diff brace mounts, the less force will be applied to the OEM brace mounts. Which as one can figure, they were not designed to take massive forces. With our design all the stress is placed on the twin tubes and not nearly as much on the oem mounts. The twin tubes don't mind taking up the slack
3) Its all about leverage. The further the diff brace mounts, the less force will be applied to the OEM brace mounts. Which as one can figure, they were not designed to take massive forces. With our design all the stress is placed on the twin tubes and not nearly as much on the oem mounts. The twin tubes don't mind taking up the slack
I almost agree with you, except you are thinking backwards here. That leverage will still apply the same force (or more) on the mounting points to the chassis, just because of the way a lever works.
Secondly, The cradle style will limit movement more than a long set of tubes reaching over a span. You will have flex in those tubes, as they are nit triangulated (due to space restrictions I am sure).
However, you may have given yourself a fantastic mixed blessing... If the strength of the tubes lowers differential movement considerably... yet still allows the vibrations to be somewhat absorbed because of the length the tubes: This could be like using a poly bushing for a motor mount in comparison to an aluminum motor mount. The performance is there, the harshness isn't.
Just my .02 I think you have a very nice looking piece of fabrication there. If I wasn't selling parts off my car to get money... I would absolutely give one of them a shot.
02-01-10, 09:34 PM
#16
Please read the following post with a purely constructive criticism tone, and in no way am I being attacking.
I almost agree with you, except you are thinking backwards here. That leverage will still apply the same force (or more) on the mounting points to the chassis, just because of the way a lever works.
Secondly, The cradle style will limit movement more than a long set of tubes reaching over a span. You will have flex in those tubes, as they are nit triangulated (due to space restrictions I am sure).
However, you may have given yourself a fantastic mixed blessing... If the strength of the tubes lowers differential movement considerably... yet still allows the vibrations to be somewhat absorbed because of the length the tubes: This could be like using a poly bushing for a motor mount in comparison to an aluminum motor mount. The performance is there, the harshness isn't.
Just my .02 I think you have a very nice looking piece of fabrication there. If I wasn't selling parts off my car to get money... I would absolutely give one of them a shot.
I almost agree with you, except you are thinking backwards here. That leverage will still apply the same force (or more) on the mounting points to the chassis, just because of the way a lever works.
Secondly, The cradle style will limit movement more than a long set of tubes reaching over a span. You will have flex in those tubes, as they are nit triangulated (due to space restrictions I am sure).
However, you may have given yourself a fantastic mixed blessing... If the strength of the tubes lowers differential movement considerably... yet still allows the vibrations to be somewhat absorbed because of the length the tubes: This could be like using a poly bushing for a motor mount in comparison to an aluminum motor mount. The performance is there, the harshness isn't.
Just my .02 I think you have a very nice looking piece of fabrication there. If I wasn't selling parts off my car to get money... I would absolutely give one of them a shot.
However the force is coming from the differential, which the diff mounts to the chassis. The upper diff mounts will see the same force yes. But where the diff brace bolts onto the chassis, it will be less the further out you go. Its simple ratio of ft-lbs vs. length. I am strictly speaking of forces in the upward and downward motion. The left and right twisting is not something the brace is trying to correct, that is the job of the two upper OEM diff mounts. The PPF greatest weakness is the upward forces that can cause failure. Thanks for the compliments to!
02-01-10, 10:50 PM
#17
Very good points. I think considering the two primary diff mounts into the whole picture, the only flexibility will be very minor (at worst). Which could easily help dampen some vibration by nature.
Thanks for completing the mental image of your design and function without tearing me a new one.
I think an almost neccessary upgrade for any FD at this age is to stiffen up the oem diff mounts with at least new oem mounts.
Thanks for completing the mental image of your design and function without tearing me a new one.
I think an almost neccessary upgrade for any FD at this age is to stiffen up the oem diff mounts with at least new oem mounts.
