[Gmecm] Was: Geting rid of electronic transmission.

[Don Sauman]

Excellent! Thanks for that Garrett.

Don

Garrett Herning wrote:

> Hi Don,
>
> Yes from tests we've done on the force motors, they seem to operate 
> correctly over a wide range of frequencies. running the later one at 
> 292.5Hz should not be a problem.
>
> Garrett Herning
>
>
>
>> From: Don Sauman <donsauman at cythera.net>
>> Reply-To: gmecm at diy-efi.org
>> To: gmecm at diy-efi.org
>> Subject: Re: [Gmecm] Was: Geting rid of electronic transmission.
>> Date: Mon, 06 Mar 2006 13:15:58 +0800
>>
>> Thanks for that Garrett.
>>
>> We don't see many 4L80Es here in Australia except in private imports 
>> although for a brief period GMH brought RHD Suburbans but they have 
>> stopped carrying parts even.
>>
>> Am I reading you correctly to say that feeding the new force motor 
>> with the lower frequency will work, or do I need to somehow reprogram 
>> to pulse at the higher frequency?
>>
>> Cheers
>> Don
>>
>> Garrett Herning wrote:
>>
>>> Hi Don,
>>>
>>> Where I work we make all kinds of equipt to test transmissions and 
>>> trans parts. (Zoom Technology, Inc... anyone in the trans market has 
>>> probably heard of us). At any rate, the force motor is nothing more 
>>> than a pressure regulator for mainline into the valve body... We 
>>> have a solenoid tester and can run either solenoid at multiple 
>>> frequencies and I've never really seen any differece in pressure vs 
>>> current response between 292.5Hz and 614 Hz... all they are doing is 
>>> PWMing to get an average current to it. All you want is the PWM 
>>> frequency to be much higher than the mechanical response of the 
>>> solenoid so you don't get it buzzing with the frequency. Other than 
>>> that it just sort of regualtes pressure along with the TPS signal 
>>> (stomp the gas and it'll jump mainline up... ease off and it pulls 
>>> it down)
>>>
>>> IMHO I don't see any reason the '94 PCM wounld't run the '96 trans 
>>> just fine. The cleaning pulse is just a quick twitch every so often 
>>> to keep the older force motors from building up dirt and sticking... 
>>> I guess the new one was built better so it couldnt do that... having 
>>> it do that every so often won't hurt it at all.
>>>
>>> Hope this helps!
>>>
>>> Garrett Herning
>>>
>>>
>>>
>>>> From: Don Sauman <donsauman at cythera.net>
>>>> Reply-To: gmecm at diy-efi.org
>>>> To: gmecm at diy-efi.org
>>>> Subject: [Gmecm] Was: Geting rid of electronic transmission.
>>>> Date: Mon, 06 Mar 2006 12:01:49 +0800
>>>>
>>>> I have been following all of this with some interest.
>>>>
>>>> In the spirit of efi and I guess PCMs, I will probably need to 
>>>> reprogram an OBD-I PCM (Don't really want to deal with OBD-II if I 
>>>> can avoid it) to deal with the changed force motor in the 4L80-E 
>>>> autotrans. Previously it operated at 292.5 Hz level but in 1994 was 
>>>> changed to 614 Hz level.
>>>>
>>>> I have a 1996 trans, and a pre-1994 PCM is being sent to me.
>>>>
>>>> Can someone who is knowledgeable explain how the force motor works 
>>>> (perhaps it is solenoid PWM?) and how the PCM may need to be 
>>>> altered to suit the upgraded force motor. Going back to an earlier 
>>>> force motor is not an option is not an option as the torque signal 
>>>> feed passage is no longer drilled.
>>>>
>>>> Also, according to the ATSG Manual, with the new design force 
>>>> motor, the need for the cleaning cycle is eliminated, so the force 
>>>> motor is no longer pulsed every 10 seconds by the PCM/TCM.
>>>>
>>>> The new force motor (8684216) is applicable to 1994- up 4L80-E, 
>>>> 4L60-E, and 4T80-E transmissions.
>>>>
>>>> Cheers
>>>> Don
>>>>
>>>> -- 
>>>> Don Sauman
>>>> 35 Asteroid Way
>>>> Carlisle 6101
>>>> Western Australia
>>>>
>>>> P: 08 9361 0337
>>>> F: 08 9361 0581
>>>> M: 0427 389 547 CDMA
>>>> M: 0413 746 695 GSM
>>>>
>>>>
>>>>
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>>>
>>>
>>>
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>>
>> -- 
>> Don Sauman
>> 35 Asteroid Way
>> Carlisle 6101
>> Western Australia
>>
>> P: 08 9361 0337
>> F: 08 9361 0581
>> M: 0427 389 547 CDMA
>> M: 0413 746 695 GSM
>>
>>
>>
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>> Gmecm mailing list
>> Gmecm at diy-efi.org
>> http://lists.diy-efi.org/mailman/listinfo/gmecm
>
>
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-- 
Don Sauman
35 Asteroid Way
Carlisle 6101
Western Australia

P: 08 9361 0337
F: 08 9361 0581
M: 0427 389 547 CDMA
M: 0413 746 695 GSM