[Gmecm] TPS for diesel and now PCM Algorithm

[Burntkat@sc.rr.com]

Well I will have a vacuum pump on the engine, it normally runs the HVAC
controls. Would this be a good enough vac source?

Thanks again for your help!


-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Ne14RoxCJ
Sent: Tuesday, January 17, 2006 8:33 PM
To: gmecm at diy-efi.org
Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm

You could do without the 4th gear switch if you wanted to lock-up in lower
gears (burnout in 1st or 2nd?) Not recommended, but I have heard of it.
Definitely use the brake switch to open the circuit for safety. Stopping
with the TCC locked would be like stopping a manual without pushing the
clutch in. this is all really primitive, and probably not recommended by any
transmission builder, but it works. I still like the vacuum switch if
possible. The wiring in the valve body changes so much between years and
models, I can't say for sure, but one side of the TCC solenoid should be
grounded and the other side should be the switched power. Hard to say how
your 700R4 is wired without taking the pan down.
Beau

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Burntkat at sc.rr.com
Sent: Tuesday, January 17, 2006 5:52 PM
To: gmecm at diy-efi.org
Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm

Beau-

So, with your idea applied to the diesel, the logic would be:

4th gear pressure switch to only allow lockup in 4th gear, to a foot switch
to enable me to select lockup, with the brake switch breaking the circuit

Correct? As long as that logic is right, I can take the wiring from there.

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Ne14RoxCJ
Sent: Tuesday, January 17, 2006 6:12 PM
To: gmecm at diy-efi.org
Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm

All of the pre-EFI trucks with a 700R4 used a vacuum switch on the firewall
to activate the TCC. The vacuum went through a coolant temp switch to stop
TCC lock-up when cold. I have been using just the vacuum switch on my TBI
and, now TPI Blazer for years and I can say that I like the set-up better
than letting the ECM control it. Other trucks I've worked on have ALWAYS
needed some adjusting of the TCC parameters to make them right with bigger
tires/lower gears. Imagine the TCC locking up in third gear at 35 mph and
RPMs drop to 1200. Give it a little gas and it starts locking and unlocking.
Sure, it's nice to be able to adjust those settings, but it is just an
un-needed hassle in most cases I've seen. My vacuum switch set-up uses a 4th
gear pressure switch in the valve body to only allow lock-up in 4th (OD) the
only time I need TCC lockup. It unlocks above 90-92 kPa and locks back under
about 85-88 kPa.

Oops, I just remembered that you're using this on a diesel. They don't make
the same vacuum as a gas, do they. Anyway, that's my view of the types of
factory TCC control systems. A really simple option would be to run the TCC
solenoid to a floor mounted dimmer switch and activate it manually. Just
remember to also run it through a brake pedal switch and a 4th gear switch
for safety.
Beau

-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Burntkat at sc.rr.com
Sent: Tuesday, January 17, 2006 3:35 PM
To: gmecm at diy-efi.org
Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm

It does TCC lockup, and if he's running a 700R4, that's all he needs.

So the info helps me- thanks! 


-----Original Message-----
From: gmecm-bounces at diy-efi.org [mailto:gmecm-bounces at diy-efi.org] On Behalf
Of Steve Ravet
Sent: Tuesday, January 17, 2006 3:17 PM
To: gmecm at diy-efi.org
Subject: RE: [Gmecm] TPS for diesel and now PCM Algorithm

 
> I located both types of TPS and the one I have settled on is 
> a potentiometer type TPS that was used in mechanical injector 
> pump 6.2 in Hummers when used with a 4L80E trans.
> 
> As I have a couple of 1227747 PCMs handy I was thinking of 
> disabling the fuel side and letting it just run the trans.
> 
> Am I nuts to try this aproach?

Maybe...  The 747 doesn't do transmission.

--steve


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