The lockup Torque Convertor.........

[wordski]

Well,I have an 86 olds cultass with the 307/200-4r combo.I am getting a 350 Chevy put in in a couple of weeks and I was wondering if me switching engines would affect the lockup on the torque convertor since it's computer controlled?

 

[HOTTOGO]

As long as your using the ECM and all the sensors and switches from the 307, with everything hooked up the same as before nothing will change.

 

[wordski]

Wow, I was hoping that you'd be the one to respond.Do olds and Chevy's use the same sensors and switches?What does the ECm look at to tell it when to lockup?

 

[HOTTOGO]

Temp, vac, throttle position,brake switch every car is a little differ on switches and sensors so can't make a general statment if Chevy and Olds would all have the same.

 

[wordski]

Geez,you're kinda of an early riser.TPS I wont have because of me switching to a non computerized carb,temp switch im not sure about,OH LORD IM DONE FOR!!CALLING LOCAL TRANNY SHOP FOR POSSIBLE SOLUTIONS................................

 

[85 Riviera]

If you are not going to be using the TPS then you at least need to fool the ECM into thinking the TPS is there. The TPS has 3 wires, 1 is a ground the 2nd is the supplyed power to work the senser which is about 5 volts and the 3rd is the voltage the TPS sends back to the ECM for referance so that the ECM can tell how much throttle you are giving it, it takes that voltage from the 5 volts going to the senser and resest it in amount of throttle to send its reading, In order for the ECM to allow lockup the TPS needs to send at least .5 volt to 2.0 volts back to the ECMs terminal 2 from the TPS's terminal B. The best way to do this is to pull the TPS out the carb after the carb swap and connect the TPS to its harness but set it aside like on the finder well then use a multimeter set on 20 VDC connect the meter to terminal 2 on the ECM while the ECM is fully connected to its harness, the meter should be connected to terminal 2 on the ECM and a ground on the body, put the key in the run postion then move the TPS senser's rod till you reach 1 volt then use a hot soldering iron to melt the plastic on the TPS senser right at the base of the rod so that it fuse's together to the TPS base that way it holds your setting at 1 volt. That way the ECM will allow lockup

 

[85 Riviera]

Oh yeah, whatever that case if you take out the ECM controlled HEI than the module will not get a signal from the pick up coil and this will make the ECM think that the engines not spinning (running) ,at that point you will get no lockup or A/C compressor operation. I'm still wondering how a chevy will handle a olds ignition curve?

 

[wordski]

gonna go in the corner and cry now

 

[85 Riviera]

Do yourself a favor and just forget about the ECM alltogether. Wire a switch for the lock up, wire the A/C cutout relay for full operation as long as the A/C is on and use a carb and HEI that does not require an ECM, oh yeah and take the buld out the check engine light

 

[wordski]

You know,you're absolutly right,I was gonna put an edelbrock intake and carb on there and go to the good ole yard and yank a distributor.How do I wire the switch.I cant find a shop here that'll even touch it.

 

[wordski]

Oh yeah, as a side thought,if the convertor only locks up after 35mph under light throttle or whatever.Since I only do city driving with the car,would it be all that bad if I just drove it for a little while without the TC being locked up?

 

[85 Riviera]

Only if you keep the tranny temp down. its probley ok for short trips in city traffic but I would not put it at highway speeds for longer then 20 minutes or heat can really start to build, It wont hurt anything right off the bat but the long term effect will wear one out. I'm going to check my service manuals wiring diagram for your car and I'l get back to you on how to wire the switch for the lockup, I did it before its easier then changing your oil.

 

[MeanBuicks]

If you'd rather have the TCC operate automatically w/o the ECM, as opposed to a manual switch, consider the TCI 376600 lock-up kit. It was designed with guys like you in mind.

 

[HOTTOGO]

If your planning on non-ECM then you have no probs, carb, distributor, lockup kit and "service eng. soon" light and your done.

http://www.aros.net/~rbuck/tech/4thgear.html

With this diagram you need N/O switch.

 

[HOTTOGO]

Originally posted by wordski
Geez,you're kinda of an early riser.

Yeah! up at 4am, start work at 6am, home at 6pm, kinda sucks but the pay is good!

 

[wordski]

HOTTOGO....let me get this straight,all that I have to do is wire the tranny the way the diagram shows and there is no need for a manual switch?

 

[HOTTOGO]

Yes, for fourth gear only lock-up, but you need a normally open switch on the vb for you 4th gear pressure sw.

 

[85 Riviera]

yeah in that diagram the forth gear switch will supply a ground for TCC silinoid when the tranny goes into 4th But you will still need to supply 12 volts to the red wire. I would run a connection to the red wire supplying 12 volts but put a switch in the middle just for times that you dont want lockup in forth ( like full throttle high speed runs) place the switch under your column kinda hiden but easy to get too. Also take the 12 volts from the fuse box using a connection that would kill the voltage with the ignition key turned off just to be safe. Thats the way I run them.