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I just swapped my old 1227747 ecm for a newer 16197427 pcm after reading about it on binderplanet. I must say, wow, there is quite a diffrence!
My idle is smoother and better. The engine sounds smoother and better, accel is better and smoother, steady cruise is smoother and better, heavy and wot accel is better and stronger, even decel is better and stronger.
Pretty much under all conditions my engine runs better, smoother, and the "butt" dyno even feels like I picked up a couple more ponies. All I did was input my timing table from my old 7747 tune into the new bin file and did a little smoothing of the fuel maps and went for a spin. I am on my 5th data log and have almost got my fuel maps where they need to be.
The pcm splits up the fuel into two diffrent maps, one for near ilde, one for off idle, same thing with spark tables. There is a idle and off idle table. Also if using with a manual trans or non computer controlled auto, there are also a few changes you need to make to turn off the auto trans controlls. I also turned off all the trans error codes and turned off the egr.
The 7427 pcm is found in most 94-95 trucks and vans with the automatics. They were used with the 4L60E, and 4L80E electronicly shifted transmissions. There is also about 4 times as much code in the computer as the old 7747, so theres a little more to learn. But I would reccomend anyone with a 7747 system looking for the next step, to look at swapping in this one. You can re use your current harness, just remove the pins from the old 7747 connectors, and put them in the 7427 connectors.
Another nice thing about this computer, is it can run multi port (batch fire) with just a small mod to the ecm and a little tweaking to the programming.
My idle is smoother and better. The engine sounds smoother and better, accel is better and smoother, steady cruise is smoother and better, heavy and wot accel is better and stronger, even decel is better and stronger.
Pretty much under all conditions my engine runs better, smoother, and the "butt" dyno even feels like I picked up a couple more ponies. All I did was input my timing table from my old 7747 tune into the new bin file and did a little smoothing of the fuel maps and went for a spin. I am on my 5th data log and have almost got my fuel maps where they need to be.
The pcm splits up the fuel into two diffrent maps, one for near ilde, one for off idle, same thing with spark tables. There is a idle and off idle table. Also if using with a manual trans or non computer controlled auto, there are also a few changes you need to make to turn off the auto trans controlls. I also turned off all the trans error codes and turned off the egr.
The 7427 pcm is found in most 94-95 trucks and vans with the automatics. They were used with the 4L60E, and 4L80E electronicly shifted transmissions. There is also about 4 times as much code in the computer as the old 7747, so theres a little more to learn. But I would reccomend anyone with a 7747 system looking for the next step, to look at swapping in this one. You can re use your current harness, just remove the pins from the old 7747 connectors, and put them in the 7427 connectors.
Another nice thing about this computer, is it can run multi port (batch fire) with just a small mod to the ecm and a little tweaking to the programming.
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