[Gmecm] $EE questions/ DRAC questions

[William Lucke]

The Caddy uses an HEI dizzy. The opti-spark pickup was grafted into the
base. We're also running a TPI 400/4L60E in a Jaguar like this.

The 4L80E just has one shift solenoid inverted compared to the 4L60E.
This was accomplished caveman style with a relay.

We've played with the TCC appy/release 2nd gear tables for manual mode 
and normal mode but haven't been able to get it to work for us. I'm 
wondering if there's something we're overlooking.

Sounds like we have to put that DRAC back in. Thanks.


Will



Scott Peitzsch wrote:
>> How many people here do anything with the $EE mask ('94-'95 LT1 apps)?
> 
> I use it quite a bit - owned a few LT! cars and have a few LT1 swaps under
> my belt.
> 
>> We're using an 8051 to control a Caddy 500/4L80E combo in our 1990 
>> Suburban and we have a couple of questions on things that are stumping 
>> us.
> 
> Nice!  Did you adapt the Opti wheel and sensor to the inside of a caddy
> distributor?
> 
> Also, did you correct the inconsistencies in the shift logic between the 
> 4L60E
> and 4L80E in the transmission, in the PCM code, or using an enternal 
> hardware?
> Controlling a 4L80E trans using a PCM originally intended for a 4L60E is a
> project I've had on the back burner for a while now - need to get to it 
> one of
> these days!
> 
>> How does one set the torque convertor to lock in manual 2nd?
> 
> The latest TunerCat definition for the $EE mask has Manual Mode TCC apply
> and release tables that include a 2nd gear column.  Have you tried these 
> yet?
> All of the stock calibrations I;'ve seen have the apply set to 255 in 
> all cells, meaning
> it won't lock up in 2nd manual.
> 
>> The VSS originally fed a DRAC which fed the speedo and goofy 1 channel 
>> rear-only ABS. Since the 8051 has the capability to output almost any 
>> multiple of the VSS frequency, we dumped the DRAC and are running the 
>> speedo and ABS off a PCM output, which mostly works... except that the 
>> ABS is constantly flashing the brake warning light with its trouble 
>> code indicating that it's not getting a good VSS signal. What's 
>> different between the DRAC output and the 8051 speedo output and how 
>> do we get the ABS to work with the speedo output?
> 
> The ABS output from your original DRAC module produced 128,000 PPM.
> The speedo output from that same DRAC module produced 2,000 PPM.  The
> speedo output from the LT1 PCM is also going to produce 2,000 PPM.  The
> speedo and ABS can't be run from the same PCM output since they're looking
> for different pulse ratios.  You may have to reinstall the DRAC just to 
> generate
> the ABS output.  Both the LT1 PCM VSS input and DRAC can be wired to the
> VSS - BTDT.
> 
> Hope this helps!
> 
> -Scott
> 
> 
>