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Old 05-23-2006, 04:39 PM   #21
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Quote:
Originally Posted by Mortehl
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Originally Posted by jr's3800
I will add that the 94-95 PCM does monitor Tranny temps, and if it gets too hot it will go into limp home mode
This is slightly Offtopic:

Don, define "Limp home mode" please?
Limp mode is pretty much when the PCM detects something that'* REALLY harmfull to the vehicle, that could end it'* life or severly damage the part in check, the PCM defaults back to what I call a "Gimp" program, or "Limp" mode.

Pretty much, it takes and makes the car just driveable enough without doing too much further damage to anything just drivable enough to get to a service shop or dealer.

As for the trans temps, they're still gonna get to optimum I realized last evening if you DO NOT by pass the radiatior tank cooler. 185-210* coolant passing around it will help it get warm and stay in that safety zone. At least that would be my theory.
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Old 05-23-2006, 04:48 PM   #22
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Would you be able to tell that the PCM is in "Limp mode"?

Nate, are you now considering leaving the preheat part of the radiator connected? Going by what Willwren has said on this, I was planning on bypassing the preheater. Hence BillBoost'* concern.
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Old 05-23-2006, 04:54 PM   #23
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You should notice Gimp mode pretty quickly.
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Old 05-23-2006, 05:11 PM   #24
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That'* curious then because my PCM never went into gimp mode even though my transmission was about to die. One minute, I was travelling along. The next I stop at an intersection and never get going again.
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Old 05-23-2006, 05:14 PM   #25
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Quote:
Originally Posted by Mortehl
Would you be able to tell that the PCM is in "Limp mode"?

Nate, are you now considering leaving the preheat part of the radiator connected? Going by what Willwren has said on this, I was planning on bypassing the preheater. Hence BillBoost'* concern.
Trust me.....You'll know "Gimp" mode if your car get'* that bad.

Pretty much you can't leave second gear, no first gear, or won't shift out of first until you redline the **** out of it to force second, and you prolly won't go much faster than 30-40 MPH depending on how these cars were programed.

That'* just a lil bit of what my 94 Chevy 1500 did when it had hit limp mode a few times.

As for the preheater, yes I'm considering leaving it in line. The way I look at it is, this fan is gonna be more than enough to cool the trans while stopped, along with moving down the interstate with the fan off.

The fact too, that we both live in pretty fridgid winter climates, that we will prolly need that preheater to get things moving, and possibly may have to unplug the fan so the op heat will stay in while driving, or stopped....It all really varies depending on situations.

I also haven't really verified wether or not that fan on there is automatic or we need to install a switch. If it'* automatic, then chances are we just need a resistor to change the temp that the fan engages, switched, you have total control of "How Cool" your trans will be.
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Old 05-23-2006, 05:17 PM   #26
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Quote:
Originally Posted by LakevilleSSEi
Quote:
Originally Posted by Mortehl
Would you be able to tell that the PCM is in "Limp mode"?

Nate, are you now considering leaving the preheat part of the radiator connected? Going by what Willwren has said on this, I was planning on bypassing the preheater. Hence BillBoost'* concern.
Trust me.....You'll know "Gimp" mode if your car get'* that bad.

Pretty much you can't leave second gear, no first gear, or won't shift out of first until you redline the **** out of it to force second, and you prolly won't go much faster than 30-40 MPH depending on how these cars were programed.

That'* just a lil bit of what my 94 Chevy 1500 did when it had hit limp mode a few times.

As for the preheater, yes I'm considering leaving it in line. The way I look at it is, this fan is gonna be more than enough to cool the trans while stopped, along with moving down the interstate with the fan off.

The fact too, that we both live in pretty fridgid winter climates, that we will prolly need that preheater to get things moving, and possibly may have to unplug the fan so the op heat will stay in while driving, or stopped....It all really varies depending on situations.

I also haven't really verified wether or not that fan on there is automatic or we need to install a switch. If it'* automatic, then chances are we just need a resistor to change the temp that the fan engages, switched, you have total control of "How Cool" your trans will be.
I know for a fact the B and N model I bought switches automatically at 175. Its thermostically controlled. There'* basically three connections on it: Fan TRans oil in, trans oil out.
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Old 05-23-2006, 05:20 PM   #27
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Quote:
Originally Posted by Mortehl

I know for a fact the B and N model I bought switches automatically at 175. Its thermostically controlled. There'* basically three connections on it: Fan TRans oil in, trans oil out.
3 Electrical connections, or just connections in general?

And since your fan is auto started at 175*....then you wouldn't have to worry anything about that. From the sounds of it, I would leave the stock preheater in the line....or if you want, install the cooler, and in the winter time bypass the preheater and see how it does?
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Old 05-23-2006, 07:10 PM   #28
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Morty, the computers in our cars were not as smart as the OBD2 computers...

But at the same time the Tranny temp sensor is not in the pan.. I believe it resides in the sidepan... and should measure the temp of the fluid passing by it...

But if the Pump went out in your trans, there where was the fluid flow?

When the pump went out, you should have murdered the clutch packs or simply stopped moving as there was no pressure being developed by the pump... The PCM for our cars is not going to know the pump quit, But the lack of fluid can destroy the clutch packs in a hurry...

On the 94-95 the Limp home is based on tranny temps... Above 260F you will be limited... and should be stuck in 2nd gear if memory serves..

92-93 did not have this feature...

Nor did 87-91.... It was drive untill you fry it or untill it quits...


But lets revisit your cooler Morty... I was thinking along the lines of a Thermostaticly controled unit that allows more fluid to pass when the optimum temps have been met, say 150-160F....

Is this a thermostaticly controled unit with a fan turn on of 170?

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Old 05-23-2006, 07:15 PM   #29
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Don, I believe that unit is FAN ONLY. At 170. Not a good idea.
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Old 05-23-2006, 07:23 PM   #30
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Quote:
Originally Posted by willwren
Don, I believe that unit is FAN ONLY. At 170. Not a good idea.
In that case I wouldn't reccomend it...

Again here in FL I run some HD coolers, but thats because of how warm it is here all year round...

I wouldn't want this cooler if it was -30F


Anyone know the coldest temps that a 94/95 trans will read? and weather or not the trans is lloking for the trans to heat up some?

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