Here you go MarvynDT
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I am concerned about the long term effects that this may have on the car. Yes, it may prove wonders now, but what about a few years down the road? Will it eventually weaken my shock tower welds and rip it out?
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After careful consideration of your question posted +13 hrs ago. I decided to perform a test...and use common sense. I also presented the only knowns I have to the math lab and asked for 400% overdesign tolerance.
The mounting thickness of the shock tower where I mounted it is 3/32. I used 3/8 inch cap screws (grade 3) and nuts. I used 2 of them and drilled through. I torqued them at 15 ft pounds and incorporated lock washers. The shock tower is quite robust there. I used 3/32 plate tool steel for the mount. Took 60+ seconds (with a questionable bit and milwakee 1HP drill) to get through there. I lubed it with zepreserve to aid cooling of the bit.
The maximum torque or push /pull on the mount is absorbed by the shock itself. If it were a solid link, the dynamics would exsert about 2.43X the maximum crank torque of the crankshaft at the distance from the crank (to head mount) with SOLID motor mounts. Since this is to be used with factory motor mounts that 90% of zilvia members are actually using, they absorb shock at 50% load max (220LBS based on testing old ones in a hydrolic press not being shocked with speedshifts) so you must divide this absorbtion and all other absorbtion of the tranny mounts and the rear suspention by an unknow figure. We know it will not equal a direct link of 100% (which even a direct link cannot achieve 100% due to dynamic and static plus frictional loses)
Worst case situation with no mounts. (Shock doing all the work)
Lets consider 100% (probably more like 60 at worst)
Now ****with mounts**** and an X8 formula..
More hyper extrapolation not in favor of this shock..
This means that even if you had 1000 HP, the shock tower would never exceed 120LBS of direct torque and accumulated pressure from a speedshift (lets excersize 8X for kicks and grins) would be with a direct link, no motor mounts, and no tranny mounts, and no rear suspention, would be 920 LB's of pressure...and direct torque is never a constant. Adding in the varables it would be far less than 50% of this and if you take into consideration of what would happen during a speedshift, the total duration of maximum time under maximum stress would be less than 0.2 seconds.
Their are many varables I am not even figuring in here and going to the worst case senerio on each.
Think of U joint flexing and losses in the transmission mounts and suspetion)
This said, the shear rating (to shear it off directly) of the screw I am using on my head is 330LB/ enertia moment at 1/16th (using 3/32). I used this undersized screw to see how the stress would affect the "system".
Since I have taken a basic 220Ft Lb engine and done everything humanly possable to break something..I find that since the vehicle is resting (1/4 to much more during 0.9G cornering/braking more varables) on said shock tower and I am using two bolts for it, not to mention the one to the head is 1/23RD as strong (almost 24 times weaker in shering strength)...and no problem there...the last thing you would have problems with would be the shock tower mount.
I would be much more concerned with the mount to the engine. You will need thermodynamic insulation (no exhaust manifold bolts) and you will need to have the unit secure.
My Mount Man is working out all the mounts and I am certain that each will provide the level of stability needed to have no problems of any type. Everything that has gone into this is engineered to 400% of 300HP and if someone has that much power, the car certainly is not streetable and needs to be solid mounted for track use only.
Email for more explaination if this is not clear.
Bottom line, the shock towers are one of the strongest points of the entire car. Seat belt bolts and mounts are also quite robust....but not needed for this application.
Also remember, this system is sold as is. After 30 days, you can return it if not totally delighted. I also bear no responsability for improper mounting or useage. Use common sense. If you dont have that...then get it...I am sure you do actually.
The dynamics of an automobile is 40% art and 60% science. Then you consider the indivgual driver.
It is safe. But please don't get one if you have any doubts. You either see that it works and then know it once you try it on the track or street, or you wholesale bash it as being a dumb move.
Hey, you don't like it, dont use it and send it back within 30 days...what is the loss?
I ask everyone that does not believe 100% in what I am telling you how it feels on my car to NOT buy it at all.
I do not do dealings with those who really cannot see an advancement.
IF you don't think it will work, I won't let you have it..and they all have stamped numbers on them coming in...so try to pull a fast one.
IF it is not numbered from my lot, I am NOT responsable.
PS, I reserve the right to REFUSE SALE to those..I feel want to try to start some crap. I know who would like to try it and who don't. Each is screened and if you have not received an email from me, sign up...if you have signed up here and no email, you are not signed up.
That simple.
Know what you are getting into.
This is viable, works and will be loved. Simple. Try it. Guaranteed.