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post #1 of 5 (permalink) Old 01-22-2009, 10:27 AM Thread Starter
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Special PCM question

I tried searching this problem but i really cant find the answer to my question.

So anyways i got a special PCM installed a while back and i gave it time to get used to my settings.

However my first - second gear change is really abrupt, like a bad standard driver (clutchless).

Im also not liking the really high rpm shifts in the cold.

SO I put my sxt PCM back in and the rough shift is gone, it shifts nice and smooth now.

So i dont know, i guess i want to know, are these rough shifts especially in first gear ok? It seems like a lot of abuse on our transmissions.

I like the PCM features such as its quick downshifting and the car feels like it has a bit more power, but im afraid it may be at the risk of killing the tranny over time.

Any input would be great.

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post #2 of 5 (permalink) Old 01-22-2009, 10:39 AM
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Could that be why specials have bigger c-v joints and stronger axles?

Are not the gears different in a special,would that matter to the pcm?
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post #3 of 5 (permalink) Old 01-23-2009, 01:45 AM Thread Starter
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Quote:
Originally Posted by gn300 View Post
Could that be why specials have bigger c-v joints and stronger axles?

Are not the gears different in a special,would that matter to the pcm?
ya the special has the 3.89 gears i believe but Ross was saying it wont really matter. Like its more of an acceleration issue but not really one that would mechanically affect the feel of the shifts.

I put it back in after driving one day with the sxt one and i noticed that its a clear difference in the shifts, they are very high compared to the sxt. The 1-2 gear shift doesnt seem to be as rough now or as abrupt rather. I noticed its usually if you are approaching a stop and you accelerate to the legal speed quickly and then begin to brake, it will brutally pull out of 2nd gear and go into first, meanwhile it feels like the motor is falling out of the car. Thats why in those areas i just use autostick or drive very slowly. The SXT pcm doesnt do this because it starts downshifting when the car is basically stopped. That downshift usually freaked me out.

One strange thing i found tho is that if you start accelerating very slowly then it will shift low in the 2000 mark. But if you accelerate really sharply and then level off, it will want to keep on going.

So if i just gently press the pedal it will shift very close to the sxt pcm.

The sxt feels the same in A/S from what i could tell, its just the crazy downshifting the special one exhibits.

Another strange thing was that the sxt one would not take the revs in D beyond 4.5 k or maybe 5, whereas the special hit close to 6000 when i floored it. So the sxt/normal pcm likes to keep the revs low and is always in high gear. Meanwhile the special is usually in the 2nd highest gear and is ready to downshift immediately.

I think i kind of figured it out now after the swap.

BTW, I will probably get the gears installed soon to fix the speed reading issue just as soon as Ross' back gets better.

Thanks for the input.

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post #4 of 5 (permalink) Old 01-23-2009, 02:35 AM Thread Starter
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Quote:
Originally Posted by gn300 View Post
Could that be why specials have bigger c-v joints and stronger axles?

Are not the gears different in a special,would that matter to the pcm?
btw im not sure why the special has bigger drive components, still the same tranny so its not like the cv joints will snap.

Maybe it was for another reason. The special is a lot heavier than most 300ms so i guess it all adds up in various places.

I might look into getting stronger cv joints and axles from the special for towing purposes.
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post #5 of 5 (permalink) Old 01-23-2009, 07:22 AM
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I had a very similar issue, only it was after doing a tranny service. Shifting into third almost launched me out the window. Have you recently put the pcm in, or been doing anything to the car that would cause it to go into :learning mode"? I spoke to Ross when it happened to me, and he told me it had for some reason gone into slow learn and the problem would go away over time. It took two weeks of normal driving for it to go.
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