NastyZ28 Forum



Go Back   NastyZ28.com > Drivetrain & Performance > Transmission & Driveline Topics
User Name
Password

Reply
 
Thread Tools Display Modes
Old 04-08-2006, 08:55:54 PM   #1
sniggle_t
Lifetime Gold Member
 
sniggle_t's Avatar
 
Join Date: Jun 2003
Location: Schenectady, NY
Posts: 1,893
Turbo 350 question

Laying under my car the other day contemplating the replacement of the trans cooler lines, I noticed what looks like a sending unit of some sort just below where the cooler lines go into the case. What is it for? Mine is not connected to anything. Came from a 72 Camaro.

Thanks.
__________________
I recently attended a sexual harassment seminar,
now I think I'll be really good at it!


NASCAR - Non Athletic Sport Centered Around Rednecks

Going to war over religon - "Basically it's killing each other to see who has the best imaginary friend"
sniggle_t is offline   Reply With Quote
Old 04-08-2006, 11:49:56 PM   #2
dustypowers
Lifetime Gold Member
 
dustypowers's Avatar
 
Join Date: Apr 2005
Location: Atoka Tenn
Posts: 295
sounds like kickdown maybe is it cable or line
__________________
http://img489.imageshack.us/img489/1662/mvc165f6cz.jpg
If ya cant baffle em with brilliance, dazzle em with friendship.
Here is a toast to the simple man far and few between r the ones who take life for what it is and strangers as friends for he who knows no strangers make everday a friend .

http://www.nastyz28.com/forum/showthread.php?t=78730
dustypowers is offline   Reply With Quote
Old 04-09-2006, 07:43:42 AM   #3
John Wright
Lifetime Gold Member
 
John Wright's Avatar
 
Join Date: Aug 2002
Location: Rustburg, Va
Posts: 13,360
Quote:
Originally Posted by sniggle_t
Laying under my car the other day contemplating the replacement of the trans cooler lines, I noticed what looks like a sending unit of some sort just below where the cooler lines go into the case. What is it for? Mine is not connected to anything. Came from a 72 Camaro.

Thanks.

Are you asking about the modulator valve? If so, it needs a vac line hooked up to it.
__________________
Life is like a roll of toilet paper. The closer it gets to the end, the faster it goes.
John Wright is offline   Reply With Quote
Old 04-09-2006, 11:14:52 AM   #4
GoldenOne7710
Veteran Member
 
Join Date: Jun 2004
Location: Athens, GA
Posts: 3,191
You say that trans came from a '72 Camaro? Are you sure if was the original trans for the '72? It sounds like late model stuff. Is it an electrical plug or a "port" like a hose would go on it?
__________________
-Andy
1979 Z/28

NRA Life Member
GeorgiaCarry.org Member
GeorgiaPacking.org Member
ΜOΛΩΝ ΛΑΒE

Equal Opportunity Offender
GoldenOne7710 is offline   Reply With Quote
Messages from Our Sponsors !
Awesome NastyZ28.com Merchandise !!

T-shirts, wearing apparel

Drinkware, Mouse Pads, Decals

Old 04-09-2006, 12:26:31 PM   #5
jakeshoe
Lifetime Gold Member
 
jakeshoe's Avatar
 
Join Date: Dec 2000
Location: Republic of Texas
Posts: 8,742
TCS switch
__________________
www.jakesperformance.com
4L80Experts and Performance GM Automatic Transmissions.
Check out www.race-trans-tech.com
jakeshoe is offline   Reply With Quote
Old 04-09-2006, 03:18:56 PM   #6
Crosley
Member
 
Join Date: Jan 2003
Location: AZ
Posts: 33
you can leave it or remove it. install a 1/8 inch pipe thread plug
__________________
Tony
Crosley is offline   Reply With Quote
Old 04-10-2006, 09:27:13 AM   #7
sniggle_t
Lifetime Gold Member
 
sniggle_t's Avatar
 
Join Date: Jun 2003
Location: Schenectady, NY
Posts: 1,893
Hard to photograph but....

Don't know if the tranny is original. Car had a target motor so there is a good chance the trans was swapped also. The sender appears to require an electrical connection.

TCS switch? Does that mean "throttle control switch"? The trans does have a kickdown cable.

Here are some pictures. Not the greatest photos but........

First picture is sideways. The sender in question is the one close to the pan rail.

In the second picture it is showing the sender to the right of the dipstick tube.




__________________
I recently attended a sexual harassment seminar,
now I think I'll be really good at it!


NASCAR - Non Athletic Sport Centered Around Rednecks

Going to war over religon - "Basically it's killing each other to see who has the best imaginary friend"
sniggle_t is offline   Reply With Quote
Old 04-11-2006, 02:38:10 AM   #8
siberbunak
Veteran Member
 
Join Date: Mar 2006
Location: Istanbul TÜRKİYE
Posts: 428


I think you need to look for a hydraulic circuit layout diagram of TH350 in order to guesstimate what that switch is.
__________________
Sky is the limit when it comes to bulshit

Siberbunak lives in Istanbul TURKIYE.
siberbunak is offline   Reply With Quote
Old 04-11-2006, 03:04:05 AM   #9
jakeshoe
Lifetime Gold Member
 
jakeshoe's Avatar
 
Join Date: Dec 2000
Location: Republic of Texas
Posts: 8,742
It's a TCS switch...

Screwed into the high gear circuit...

Crosley's suggestion is correct, use it as a plug or if it is unsightly replace with an 1/8th pipe plug.
__________________
www.jakesperformance.com
4L80Experts and Performance GM Automatic Transmissions.
Check out www.race-trans-tech.com
jakeshoe is offline   Reply With Quote
Old 04-11-2006, 07:54:50 AM   #10
sniggle_t
Lifetime Gold Member
 
sniggle_t's Avatar
 
Join Date: Jun 2003
Location: Schenectady, NY
Posts: 1,893
OK, cool! Now I know what it is.

So what does the TCS Switch do exactly?
__________________
I recently attended a sexual harassment seminar,
now I think I'll be really good at it!


NASCAR - Non Athletic Sport Centered Around Rednecks

Going to war over religon - "Basically it's killing each other to see who has the best imaginary friend"
sniggle_t is offline   Reply With Quote
Old 04-11-2006, 08:08:12 AM   #11
manicmechanic
Lifetime Gold Member
 
manicmechanic's Avatar
 
Join Date: Oct 2000
Location: Tulsa, Oklahoma
Posts: 2,079
On 81 model Camaro's a computer controlled the carb and trans to meet emissions standards for that year. You have a Turbo350C in your car, it had a lockup converter controlled by the computer. TCS= Torque Converter Switch
__________________
"A good friend is someone who will bail you out of jail, but your best friend is the one sitting next to you saying "that was awesome"


71 Firebird in waiting
78Z/28 done up like 81 383,350T...
80Z/28 383,2004R vortecs....
2002 T/A WS6 A4
2006 Charger DAYTONA R/T TorRed #1988 of 2000
manicmechanic is offline   Reply With Quote
Old 04-11-2006, 11:35:40 AM   #12
sniggle_t
Lifetime Gold Member
 
sniggle_t's Avatar
 
Join Date: Jun 2003
Location: Schenectady, NY
Posts: 1,893
Should I wire it to a toggle switch for when I am on the highway or just leave it alone?
__________________
I recently attended a sexual harassment seminar,
now I think I'll be really good at it!


NASCAR - Non Athletic Sport Centered Around Rednecks

Going to war over religon - "Basically it's killing each other to see who has the best imaginary friend"
sniggle_t is offline   Reply With Quote
Old 04-11-2006, 12:36:36 PM   #13
Twisted_Metal
L. G. M. / Moderator
 
Twisted_Metal's Avatar
 
Join Date: Feb 2004
Location: Bloomtown, MN
Posts: 22,607
What's it do?
Activates a valve in the tranny to engage the lock-up torque converter clutch.

Quote:
Originally Posted by sniggle_t
Should I wire it to a toggle switch for when I am on the highway or just leave it alone?

Do you have a lock-up torque converter? If not, it won't do anything for you. You need more than a toggle switch for it to operate correctly. (You want it to disengage when you hit the brake.)

There were a couple of parts involved in the lock-up system for the 81 that you don't have in your 72. There is a separate switch on the brake, a vacuum switch on the fender and a couple of wire circuits to complete the system. (My 80 Berlinetta with a TH200 came with a lock-up Torque Converter and I still have these pieces in my car.) The plug is the same 2-pin connection but only one pin is used.

I considered re-using the controls/wire for the TCS but I wasn't sure if everything still worked. I will be rewiring my 2004R from scratch instead of playing with the 25 year old parts.
Twisted_Metal is online now   Reply With Quote
Old 04-11-2006, 03:13:09 PM   #14
jakeshoe
Lifetime Gold Member
 
jakeshoe's Avatar
 
Join Date: Dec 2000
Location: Republic of Texas
Posts: 8,742
TCS is short for transmission controlled spark.

It does not have anything to do with a TCC solenoid. Torque Converter Clutch...

He said it was a 1972 trans, that is about right for the TCS system, 70-71 I believe.

Lockup TH350's came out in 1979.
__________________
www.jakesperformance.com
4L80Experts and Performance GM Automatic Transmissions.
Check out www.race-trans-tech.com
jakeshoe is offline   Reply With Quote
Old 04-11-2006, 07:13:43 PM   #15
sniggle_t
Lifetime Gold Member
 
sniggle_t's Avatar
 
Join Date: Jun 2003
Location: Schenectady, NY
Posts: 1,893
Thanks everyone for your responces. Looks like the trans was the original 72 piece. Looks like a good place to put a trans temp gauge!

I found some interesting info on the web.

Transmission Controlled Spark (TCS): An emissions-control system to prevent distributor vacuum advance at normal operating temperature until the transmission has shifted into high gear by using a transmission-mounted electric switch controlling a solenoid-actuated vacuum valve.

Transmission Controlled Spark: (TCS) A system to reduce the emission of nitrous oxides by which a vacuum solenoid and a switch in the transmission system prevents the distributor's vacuum advance mechanism from operating in the lower gears and at low speed

From highperformancepontiac.com,

The emission control system used from the start of production in the '73 model year was fairly complex, and Pontiac engineers knew that part-throttle performance would ultimately suffer from it. To prevent any major loss, the system was designed to meet the exact letter of the law. By loosely interpreting the compliance requirements, it appeared as if the engine must be compliant only for the duration of the testing period. So engineers used a time-delay solenoid that allowed the system to operate long enough to pass emissions testing but provide maximum throttle response and efficiency thereafter.

In an attempt to reduce oxides of nitrogen, Pontiac installed a vacuum-actuated EGR valve that circulated metered amounts of exhaust gas into the intake manifold. The first-type system (top) used an electric solenoid to control vacuum to the EGR valve. EGR operated in conjunction with TCS to provide maximum part-throttle performance. This solenoid was eliminated in the second-type system and a thermostatic vacuum switch plumbed into the coolant crossover regulated vacuum (bottom).
Conditions in which the systems operated were limited to a specific range. When coolant temperature was below 71 degrees, TCS allowed full vacuum advance to assist cold engine operation, and EGR was inactive. Normal operation began once coolant temperature reached 125 degrees. TCS then denied vacuum advance any time the transmission was in first gear or for up to 55 seconds after an upshift from First. Under the same condition, the EGR system operated exactly opposite where EGR was present any time the engine was in First gear or for up to 55 seconds after an upshift.
Together, TCS and EGR controlled the amount of hydrocarbons and NOx emitted during testing or for a short period under normal acceleration. Once the time delay solenoid timed out, however, TCS allowed for full vacuum advance for maximum throttle response, while a second switch connected to TCS denied vacuum to the EGR valve for maximum combustion efficiency. The entire system would reset whenever the transmission dropped back into First gear and the timed process began again. In the technical sense, the emissions system was compliant. But it did not take long for the EPA to discover that the system was not fully so. Pontiac was given a limited amount of time to find a solution and recertify every engine within each respective group or engine production would come to a halt. Caught trying to provide the best running car yet comply with loosely interpreted testing requirements, Pontiac engineers worked diligently to produce a fully compliant alternative to the time-delay system.
__________________
I recently attended a sexual harassment seminar,
now I think I'll be really good at it!


NASCAR - Non Athletic Sport Centered Around Rednecks

Going to war over religon - "Basically it's killing each other to see who has the best imaginary friend"
sniggle_t is offline   Reply With Quote
Reply




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



Copyright © 1997 - 2014 NastyZ28.com Inc.
Powered by vBulletin Version 3.5.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.