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RE: 4L60E Trans controller
Shift overlap refers to part-throttle upshifts and part-to-no throttle
downshifts. They had to be soft in the car I was working on.
I engage the TCC as early as possible. In a performance application, I may
engage it as early as 30mph. No slippage is a good thing. This allows the
overdrive to be used as a true gear splitter in my application.
You may call it novelty. For a true daily-driven street car that sees equal
time at the dragstrip, road course, and has a programmable nitrous system,
these novelties have become valuable tuning tools. I've dialed this 99 T/A
into running 11.90 on Toyo street tires, the same tires it pulls over 1.0g
in the corners on. Your novelty is my necessity, and I was simply hoping to
share the benefits of this tool with others here.
> -----Original Message-----
> From: nacelp [SMTP:nacelp@bright.net]
> Sent: Friday, March 10, 2000 9:44 AM
> To: gmecm@diy-efi.org
> Subject: Re: 4L60E Trans controller
>
>
> > The other driveability issues I refer to include shift overlap, part
> > throttle shift, and an option to engage overdrive between gears, if
> you'd
> > like to use it as a gear splitter. A connection is also included that
> would
> > permit paddle-type shifters to bang through all 6 possible gear ranges
> > (that's 3 gears plus overdrive after each).
>
> shift overlap?. What do yoiu mean by that?.
>
> engage overdrive between gears. During the gear change engage the TCC?.
> For
> what reason?.
> It's really not a gear splitter, just eliminates the converter slippage.
> A
> flip flop and toggle switch I think would get you the same thing.
>
> I don't see issues, just novel (?) options. Still nothing that editing a
> pcm with available hardware doesn't get you, at a lot less cost.
> Grumpy
>
> > The ecm/tcm trucks I refer to are MY 98-00.
> >
> > > -----Original Message-----
> > > From: nacelp [SMTP:nacelp@bright.net]
> > > Sent: Thursday, March 09, 2000 12:56 PM
> > > To: gmecm@diy-efi.org
> > > Subject: Re: 4L60E Trans controller
> > >
> > > Isn't this an answer that involves just throwing money at the
> problem?.
> > > Or was this an item that was thrown at you to evaluate?.
> > >
> > > > I'd opt for the Speed Pro T-Com aftermarket trans computer. It's a
> > > > stand-alone unit that's programmable via laptop, and allows for
> > > programming
> > > > of shift points, line pressure, converter lockup, and many other
> > > > driveability features.
> > >
> > > What other drivibility features?.
> > >
> > > I did an installation on a 99 T/A, and differences
> > > > are dramatic. The coolest part is that I've programmed it to be real
> > > subtle
> > > > under 75 % throttle position, then past that point, all of the
> changes
> > > > (revised shift points, increased line pressure, etc.) kick in, and
> the
> > > trans
> > > > gives a real Jekyll and Hyde attitude to the car.
> > >
> > > Real subtle can cause excessive heat-wear.
> > >
> > > I recommend it highly. One
> > > > note though, on late model PCU-equipped F-bodies, the stock computer
> > > still
> > > > looks for trans inputs, and the SES light is illuminated. I'm
> creating
> a
> > > > daughterboard to feed the factory trans plug the voltages it's
> seeking
> > > per
> > > > the GM Service Manual, and this should cure the dash light blues.
> Using
> > > the
> > > > T-Com in a pickup truck won't cause any dash light issues, since
> the
> > > truck
> > > > uses separate ECM/TCM computers.
> > >
> > > Which trucks are these other then maybe the diesels?. Last numbers I
> > > looked
> > > at like the 8625 was a PCM, meaning engine tranny were together.
> Course
> > > my
> > > data ends about MY 96.
> > > Grumpy
> > > Originator of CSH, HQ
> > > >
> > > > Scott Parkhurst
> > > > Technical Editor
> > > > Popular Hot Rodding Magazine
> > > >
> > > > > -----Original Message-----
> > > > > From: gene l. clifford [SMTP:genelc@idworld.net]
> > > > > Sent: Thursday, March 09, 2000 9:25 AM
> > > > > To: gmecm@diy-efi.org
> > > > > Subject: 4L60E Trans controller
> > > > >
> > > > > Has any one been able to get a Price on GM part# 12497316
> > > > > This is a stand alone Trans controller for a 4L60E automatic
> > > > > any other info on above part would be welcome?
> > > > > GLC
> > > > > PS part is listed on pg. # 170 of yr. 2000 GM performance Cat.
> > > > >
> > > >
> > > >
> >
> >
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