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#31
06-12-2009, 07:18 AM
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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.
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69 Z28 JL8, #'s match - being restored 
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#32
06-12-2009, 07:40 AM
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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.
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Sam...  
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#33
06-12-2009, 09:14 AM
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Re: 70 L78 Camaro - Dialing in more originality
TCS= temp. controlled spark. Not transmission controlled spark.
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67 Z28, 67 RS/SS 396 Canadian, 73 Camaro Z28/LT Carolina Blue
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#34
06-12-2009, 04:26 PM
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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
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#35
06-12-2009, 07:20 PM
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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  ). 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).
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Sam...
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#36
06-12-2009, 08:55 PM
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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 ...
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Jim R Scottsdale, AZ 
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#37
06-12-2009, 11:43 PM
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Re: 70 L78 Camaro - Dialing in more originality
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Chuck Sharin [email protected] Auburn,WA (30 miles South of Seattle) 70 Camaro R/S Z-28, L-78, R/S SS 69 Camaro COPO "recreation"
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#38
06-13-2009, 04:06 PM
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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.
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70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55 71 Porsche 911 Targa
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#39
06-13-2009, 11:10 PM
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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.
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1969 Z28 1972 Corvette
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#40
06-14-2009, 12:10 AM
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Re: 70 L78 Camaro - Dialing in more originality
Uh, er, sorry 'bout side trackin' your thread Darren
 Lookin' forward to follow on photos. Good luck!!!  
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Sam...
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