In Reply to: Re: Use two throttle return springs! posted by Hoa on June 29, 2001 at 13:57:20:
I had to replace the inner part of the cable because it kept fraying. I've purchased a Lokar "high-tech" braided stainless/teflon lined cable that I will fit one of these days. Meanwhile I replaced the original cable core with a piece of a VW Beetle throttle cable ($3.99 at the local bug house).
Another thing I don't care for regarding the TEP fitment is the throttle return spring setup. Namely, there is none, and the TEP levers sit at a different angle than the orignal levers. The throttle levers require some grinding and fitting at installation, and I drlled them for return springs as well. Trouble is that the TISA manifolds place the spring anchors such that, using TEP's levers, the springs are stretched perfectly in line with the throttle bearing (180 angle from tip of lever, to bearing, to spring mount) at wide-open throttle. This means that if you are not careful with drilling the spring holes in the levers, the throttles might stick wide open due to friction and spring tension. That's not fun.
The original TISA linkage setup used a bellcrank mounted on a post on the #3-4 manifold. A rod ran from the crank to the firewall, where another crank setup transferred the motion to a rotation
of a rod that ran along the firewall. Someday I will probably reproduce this setup, because it leads to solid rods all the way to the pedal.
What linkage and manifolds are you using? Is it off of another BMW? I've heard the linkage from a 2000CS Coupe will work well with minor modifications. TIA.