Turbo Grand Prix 3500 swap

[CNCguy]

The accessory terminal on the ignition switch would work but it will be on when you have the key to "accessory". If that is a problem, you could always wire in a normally closed relay and use the wire to the solenoid to "open" the contacts while the engine is cranking.

[Jonpro03]

I take it nobody knows! LOL

I'll just grab a line from the radio.

[Jonpro03]

Where can I get a switched 12v that is switched OFF while cranking? I just need it to trip a relay. I want to get a source off of the engine harness but if I have to run a wire from the radio I will.

[Jonpro03]

It lined up just fine, but I realized that I haven't put the motor mount on yet so that will change a lot.

Last night the oil pan went away to get drilled/tapped and I finished up some loose ends on the engine harness.

[Superdave]

Probably a good thing, it's the correct diameter but just a little too short to work in the external trigger setup.


Did you manage to get the trigger to line up using the 3500 crank pulley? all the rest of us swapped to a 3.1/3400 pulley to get the clearance we needed.

[Jonpro03]

I should probably start another thread but FYI, a 3500 CPS will read the 7x wheel just fine. It even puts out a clean square wave.. (Cell phone pic)

Nah, it's ok. I wasn't sure about that so I used the CPS off of the 3.1

[Superdave]

I should probably start another thread but FYI, a 3500 CPS will read the 7x wheel just fine. It even puts out a clean square wave.. (Cell phone pic)

[Jonpro03]

Today I married the megasquirt harness with the TGP harness. I also installed the ECT that came in today and painted the UIM/LIM TB and valve covers metallic silver. I'll post pics later.

[robertisaar]

well, yeah, the TCC apply circuit.

apply 12V, TCC will lock.

remove it, or break the connection via the brake switch, TCC unlocks.

[Jonpro03]

Great, Does the trans need any input from the ecm to activate the tcc?

[robertisaar]

jon, i think you're making it much harder than it is...

if you take a look at the diagram, you'll see that the brake switch is a necessary part of TCC operation. whenever the brake is pressed, the circuit to apply the TCC is broken, so no more lockup.

and what is this about engaging overdrive? the 4T60 has a VERY minimal set of controls from the ECM, and if you're at a high enough MPH compared to where the TV cable is positioned, it will shift into 4th regardless of ECM intention.

[Jonpro03]

I found this documentation to controll the TCC with Megasquirt2 using the fast idle output to trip the solenoid.

For example, if you wanted to use the FIdle output as a TCC control, and the accel LED as an indicator that the TCC is active, you would set:

* FIdle (PM2):
o Port PM2, enabled
o variable = map < threshold = 75, hysteresis = 10,
o AND
o variable = coolant > threshold = 160, hysteresis = 10,
o Power-on value = 0
o Trigger value = 0
* Accel LED (PM4):
o Port PM4, enabled
o variable = map < threshold = 75, hysteresis = 10,
o AND
o variable = coolant > threshold = 160, hysteresis = 10,
o Power-on value = 0
o Trigger value = 1
Example: Torque Converter Clutch Control

Suppose you want to engage OD (overdrive) over 50 kPa MAP, and engage the LU (torque converter lock-up) clutch at 75 kPa MAP, provided temp is over 140 and RPM is over 2000. For a torque converter clutch control (TCC) using FIdle with 3 conditions (rpm > 1500, CLT > 160, map < 75), set:

PA0 - Knk Enable:

* rpm > 1500
* coolant > 160

and

PM2 - FIdle:

* map < 75
* port0 > 63

Then use the FIdle output to drive the TCC relay (if you have a relay board, you are all set). Not that you also need a 3/4 gear indicator switch and a brake switch in the external circuit:

EDIT: megamanual won't let me copy the image of the TTC Control Circuit so here's the link to the webpage, the image is about 3/4 the way down the page. http://www.megamanual.com/ms2/spare.htm



Is the brake switch already present on the harness or is that controlled by the TGP ecm?
If so, it's as simple as:
30 green/orange = TCC = B7 TAN/BLK

[Jonpro03]

Question about the Transmission. What does it need from the ecm to run?

[Jonpro03]

I finished the wiring harness diagram for the megasquirt swap, this setup is using GMDIS with an external trigger:

Megasquirt = signal = TGP engine harness


20 tan/yellow = intake temp = C22 LT GRN
21 purple = coolant temp = C16 YEL
22 blue = tps signal = C15 DK BLUE
23 lght blue = 02 = A16
24 green = CPS = D13 PPL/WHT
25 gray = iac1 = A1 LT BLU/WHT
26 gray/red stripe = 5v ref = C12 GRY
27 white/blue strp = iac2 = A7 LT BLU/BLK
28 red/white stipe = 12v = D17/C7 ORN
29 green/red str = iac3 = A8 LT GRN/WHT
31 orange/black = iac4 = A2 LT GRN/BLK
32 gray/yellow = bank1 inj\ = D9 LT BLU (2 4 6)
33 gray/yellow = bank1 inj/
34 pink/black = bank2 inj\ = D3 LT GRN (1 3 5)
35 pink/black = bank2 inj/
36 yellow/black = ICM = C9 TAN/BLK
37 orange/white = fuelpump = D7 GRN/WHT

9 SENOR GOUND = C6 BLK/WHT
10 = C5 BLK
11 = C10 BLK
12 = D4 BLK/WHT

[bszopi]

Damn... I still need to get a scope.

After this thread, I had to dig out my Velleman handheld I bought several years ago when I was working on my standalone project on the Beretta. Not sure how many times I used it, but it still looks brand new, and even has the plastic film still on the screen! Too bad I don't have a 3500 to mess with.