Free Web Site - Free Web Space and Site Hosting - Web Hosting - Internet Store and Ecommerce Solution Provider - High Speed Internet
Search the Web

CTCM BOM (Bill Of Materials)

THIS IS STILL IN THE TEST/DEVELOPMENT PHASE

NOTE: R1, R3, R5, R7 = 3006 Ohms,
R2, R4, R6, R8 = 5582 Ohms

HOWEVER, there is no "3006 ohm resistor" made. So one must combine smaller resistors in series to obtain the correct resistance.

So R1 would use a 3000 ohm resistor and two 3 ohm resistors to get 3006 ohms.

Diagram Part #	Digikey Part #	Item	Amount	~Cost ($USD)
N/A	296-1975-5-ND	1.5 Amp, 10volt Voltage Regulator	1	0.52
N/A	LMC555CM-ND	555 Timer IC	4	4 for 2.72
R1, R3, R5, R7 A B C	3.0KH-ND 3.0H-ND 3.0H-ND	3k Ohm, +/-5% @ 0.5 Watts 3 Ohm, +/-5% @ 0.5 Watts 3 Ohm, +/-5% @ 0.5 Watts	4 4 4	5 for 0.27 5 for 0.27 5 for 0.27
R2, R4, R6, R8 A B C D E	2.4KH-ND 2.4KH-ND 200H-ND 560H-ND 22H-ND	2.4k Ohm, +/-5% @0.5 Watts 2.4k Ohm, +/-5% @0.5 Watts 200 Ohm, +/-5% @.5 Watts 560 Ohm, +/-5% @.5 Watts 22 Ohm, +/-5% @.5 Watts	4 4 4 4 4	5 for 0.27 5 for 0.27 5 for 0.27 5 for 0.27 5 for 0.27
D1-D8	1N914CT-ND	1N914 Diode	8	8 for 0.80
C1, C3, C5, C7	311-1199-1-ND	1.2 uF Capasitor	4	10 for 3.08
C2, C4, C6, C8	399-1092-1-ND	.01 uF (10nF) Capasitor	4	10 for 0.80
T1-21	2N3904FS-ND	Basic Transistor	21	0.16 EA
LED	P424-ND	Red LED's	~8	10 for 2.15
N/A	?	SPDT Switch (TCM selector)	1	?
			Total	~$15.59

The construction of the CTCM, TCM Selector, Grounder uses BOM above, not shown is the shifter (would require either 3 or 6 switches- 3 SPDT or 6 SPST, 3 LED's, assorted construction costs (aka the mechanical shifter assembly- would need a shifter, shift knob, enclousure, etc). The switches used inside the shifter should probably be pushbuttons (normally open)- basically when the shifter is moved into position 1, 2, or 3 (for first, 2nd or 3rd gear), it closes a switch(es) which in return is used by the CTCM to control what gear you are in via 555 Timer IC's and the selonoid pack.

This circuit does NOT use lockup. The idea being, lockup is when the torque convertor is turned off (and the engine is "locked" to the tranny). This is essential for long A604 life-spans, however the idea of this circuit is so you could throw a switch (TCM Selector) and use the car as a manual for racing.

This is not something you would want to do while commuting or taking a road trip- hence why the OEM TCM is still intact. The TCM Selector basically uses transistors (relays could be used at stead) to connect the selenoid pack to either the TCM (OEM) or the custom stick TCM. You'd want to use the OEM TCM as often as possible, using this circuit only for, say use at the track/etc in short amounts of time.

This design could be modified to implement lockup (thus allowing for it to REPLACE the OEM TCM altogether). To do this one must use an other 555 Timer IC to give you the same 140 hz, but at a duty cycle that varries. The OEM TCM uses 140 Hz @ 35% Duty Cycle when a solenoid is "on". Partial lockup is when a 3rd solenoid basically modulates from 0 slowly up to 35% duty cycle (35% being full lockup- the use of the 3rd solenoid at full "on"). One MUST be able to duplicate this process of going from 0-35% duty cycle to not destroy the engine. The A604 will literally self destruct if you go from no lockup to full-lockup (0 % duty cycle to 35%)- partial lockup slowly engages lockup over the course of a few seconds.

Partial lockup usually only lasts for a couple secounds however some gears allow for a "partial lockup" mode where the 3rd solenoid modulates without ever reaching 35% (aka "ON").

Then to implement lockup, one must input a combination of a few different signals to duplicate what the OEM TCM does. Basically some conditions the TCM looks for, and when it sees them, will partially or fully engage lockup. This includes: Hot engine temp (lockup cools down the engine and tranny), cruiseing around at a near constant MPH & TBPS, etc.

If using a 180 degree stat in place of the 190 (or less than 180 for that matter as well), I suggest using a 2nd stat for the custom TCM in its lockup applications. A fan control from a place like Summit Racing could be used to varry what temperature (engine temp) is used to turn on lockup/partial lockup.

This circuit to date of this publication, has yet to be constructed, tested and implemented.

EDA's are showing that under computer emulation of this circuit, it *appears* to be working 100% correctly- with present componet values.

Different 555 Timer IC'c can be used, the 7556 (a larger IC which is two 555's placed together into one chip) can also be used in place of the 555. I use seperate 555's (4) so that if one dies, it only takes out one solenoid. If a 7556 dies, you lose two. Which althought may not save your solenoid pack (or your A604 depending on the circumstances involved), it may be helpful while troubleshooting.

I suggest, BTW, testing this circuit extensively with the proper equipment for many hours of use prior to installing it and using it inside the car. One could emulate a A604 solenoid pack on the work bench by using resistors of the same value as the impedance of the solenoids.

As always, especially when moding the A604- this can be risky and is presented As-Is. I am not responsible for what will happen if you build and/or use this.