Turbo Grand Prix 3500 swap

[CNCguy]

I was having a hard time getting both signals since the 58x is so much faster but damn it's a clean square wave...

Do you have one showing a full revolution of the LX9? It may help people to understand what a weird signal it uses.

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

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[Superdave]

Not yet, i was running low on time when i got that one. I also need to pick up some floppy disks so i can save the waveform instead of taking a picture of it. I might have to run it at a higher RPM than 900 as well.


If i can talk Abob into coming over to my house again this week i'll get some better captures, i could do a live feed from the scope over the net as well but that's almost too geeky.. even for me.

[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.

[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

[Jonpro03]

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

[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

[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]

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

[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]

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.