Take me to school, PWM
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From: Summerville, SC
Alright, I found this: 5-PWM (Pulse Width Modulation). What is it and how does it affect my car? PWM is the controlled slip of your converter, which basically allows the converter clutch to partially lock at lower speeds to improve fuel economy. However, this generates heat and puts wear on the converter clutch. While this is not a big problem with an OEM sized converter, it is a problem with the smaller 8-9-10 inch converters because they do not have enough clutch surface area, and they can’t absorb the extra heat generated. Nor do they have the friction area for the slip to be properly controlled by the PCM. PWM should be eliminated in any high performance application (and really any application). This function is the source of the code 1870. This function is eliminated on all our transmissions.
Now I just need to know how to get rid of it
Now I just need to know how to get rid of it
I myself would install a transgo hd-2 kit. It comes with a new regulator valve that greatly reduces the amount of pwm function. You also should have some tuning done on your car. Either hp tuners or ls1 edit would be a good choice for software for tuning. Try posting this in the tuning section. You might get a better response there. I am not a tuner and really can not help you. Here is a link for hp tuners web site. http://www.hptuners.com/forum/index.php This might help you as well. Vince
Thread Starter
11 Second Club
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From: Summerville, SC
Ok, let me ask you this. My converter will lock up, but if you give it a small percentage of throttle, it the rpms will go up and down. Does this sound like a problem generated from pwm?
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Tuningis a definate here particulary if you are using a 9.5 or 10 inch converter need to eliminate as much PWM as possible
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From: Summerville, SC
In hp tuners, to modify pwm, is it TCC DUTY CYCLE? This is the only thing I can find dealing with PWM. I'd assume I'd put the minumum up to the maximum. Is this correct? Right now its at 10 and the maximum is at 96.
That is my understanding , However I am not a tuner and you may want to ask that in the tuning setion but from my reading here yes thats what you would do
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I found a post on the HP Tuners forum. I'll copy/paste it here. It is from someone that does know what they are doing.
PWM is pulse width modulation. In stock cal's this allows the
TCC to apply smoothly (slip)
You need to fill the max table with 100% and the min table
with 90%
This will allow for 100% TCC duty cycle and a minimum of 10%
variance from the line pressure, meaning no more TCC slip.
The TCC will now be either fully locked or released. Works great!
PWM is pulse width modulation. In stock cal's this allows the
TCC to apply smoothly (slip)
You need to fill the max table with 100% and the min table
with 90%
This will allow for 100% TCC duty cycle and a minimum of 10%
variance from the line pressure, meaning no more TCC slip.
The TCC will now be either fully locked or released. Works great!
Last edited by LS1MCSS; Dec 31, 2007 at 07:03 PM.
