need advice on my torque arm purchase ...

car is an M6, ~400 NA RWHP .. gonna have about a 100 shot on her at the track .. running 4.10s in a 12 bolt .. street twin .. 26" ET streets for now .. probably stepping upto 27" QTPs as well

planning on running high 10s ..
running FLPs right now ... but also might have true duals in my future.. i really like the BMRs .. but the weldon cross brace seems to stop any true duals from happening ...

also, would the track pack be enough ?! or would i need the extreme duty one !?

about the spohn .. it seems like a REALLY nice unit .. i really like the built in DS loops (i'll have to custom weld in some loops on the BMR if i get that) ... but theonly thing that concerns me with teh SPOHN is the fact that .. where it mounts to the body (the G-load brace,, or tunnel brace) doesnt seem to be strong AT ALL .. looks like a REALLY weak point in the car ... and it doesnt get welded to the frame either like the bmr does !!

what are u opinions on these ?

 

The Spohn arm is attached to a new tranny crossmember. I doubt you could produce enough torque to break the torque arm mount.

The crossmember is bolted to the floor just like a factory crossmember. The torque force from the torque arm is pulling up. There's no stresses on the mounting bolts. Unless you could pull the crossmember through the floor, you're not going to hurt the crossmember or how it's mounted. I really doubt you could hurt the torque arm either.

I really need to get to Mission to see what a sea level run is like.

 

the spohn arm doesnt get mounted to the tranny cross member ..

it gets mounted in place of that tunnel brace.. the ugly looking thing that has grooves in it for ur exh and torque arm .. stamped steel thing ... and its only held up by 4 x 3/8" bolts

i know the TA pushes upwards .. but still .. would u feel comfortable with 4 3/8" bolts holding up ur torque arm ?! what if u decelerated REALLY quickly .. what if u had to floor it in reverese one day to get out of a bind or something !? i should wouldnt want me torque arm falling on my when i go reverse

the plates where it gets mounted to were designed to hold up a 2.5 lbs stamped steel tunnel brace .. not 500 ft/lbs of torque,

 

Under hard braking the force is going down. I know a few road racers who have broke the Spone under heavy breaking.

The new design is supposed to fix this problem

I still went with the BMR for the Peice of mind

 

Guido and I both run Spohn torque arms. He runs the 406 with a T-88 turbo in a 3rd gen and I run a twin turbo charged Grand national motor in a 4th gen. We haven't had any problems yet. I am not scared of it breaking either.....

 

They are metric bolts(no big deal just clearing it up) and yes I had a sphon arm great guy to work with help me out alot with my set-up had to make me two arms till we got it right. I don't think you could break the TA but it does mount the the floor of the car where the g-load brace goes (sheet metal) but a friend of mine who also has one welded braces from the SFC to the TA. I sold my Sphon and made my own TA. Never had a problem with it just needed some thing different.