Re: 70 L78 Camaro - Dialing in more originality
 

I never really thought about the TCS setup so what does it really do, pull timing? I know I've seen it on a bunch of LS6 cars but never really noticed it on the L78 cars. The 70 L78 Camaros had a bunch of really strange 1 year only things going on so we still have a lot to learn. https://www.yenko.net/ubbthreads/imag...iggthumpup.gif

Re: 70 L78 Camaro - Dialing in more originality
 

Been learning a bit about TCS (Transmission Controlled Spark) with my '70 Nova recently and basically it does not allow vacuum advance of timing in low gears: 1st & 2nd for TH400 and 4 speeds. It is an emissions reducer.

Re: 70 L78 Camaro - Dialing in more originality
 

TCS= temp. controlled spark. Not transmission controlled spark.

Re: 70 L78 Camaro - Dialing in more originality
 

-----In light of that, Sam, would a guy be wise to make the set-up non functional one way or another??? It could easily be done in a way that still appeared as though the set-up was fully functioning. Sort of like gutted smog-pumps.......Bill S

Re: 70 L78 Camaro - Dialing in more originality
 

Hey Bill,

You bet I plan to discretely disconnect this system (haven't figured that out exactly).

I still contend that, altho temperature is an input to the TCS system, the primary input is what gear the transmission is in, therefore TRANSMISSION Controlled Spark. Temperature input is a go, no-go sytem (I think https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif). Vacuum advance is available while car is cold, but once the water temp switch (I don't think it is a sender but rather a switch) says its warmed up, then the vac. advance is cut out (in low gears).

Re: 70 L78 Camaro - Dialing in more originality
 

The switch on MY 70 Z28 4 speed is a TRANSMISSION Controlled Spark switch, it does not allow any vacuum to the distributor until it is in 4th gear, one of the FIRST things bypassed or thrown away too ...

Re: 70 L78 Camaro - Dialing in more originality
 

http://img.photobucket.com/albums/v4...xterior112.jpg

Re: 70 L78 Camaro - Dialing in more originality
 

You can actually re-route the vacumm lines on and around the TCS switch itself, it will continue to look correct and will void out the operation of the switch.

Re: 70 L78 Camaro - Dialing in more originality
 

Exhaust installed as well as most of the smog. Should be firing it up tomorrow. I'll have more pictures then.

Re: 70 L78 Camaro - Dialing in more originality
 

Uh, er, sorry 'bout side trackin' your thread Darren https://www.yenko.net/ubbthreads/imag...lins/blush.gif Lookin' forward to follow on photos. Good luck!!! https://www.yenko.net/ubbthreads/imag...lins/laugh.gif


https://www.yenko.net/ubbthreads/imag...ins/3gears.gif https://www.yenko.net/ubbthreads/imag...ins/3gears.gif https://www.yenko.net/ubbthreads/imag...ins/3gears.gif