Trans cooler question - Team Camaro Tech
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post #1 of 16 (permalink) Old Mar 23rd, 01, 08:45 AM Thread Starter
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I have a TH400 with shift kit behind a modified 396. I have the B&M aux cooler in front of radiator, but nothing to the radiator itself.

I am replacing the radiator. (Flex fan came apart; destroyed everything) I am thinking I will get a radiator with the trans cooler in it. I'd like to get rid of the external cooler, but that's probably a bad idea.

Should I use both coolers? Run the hot fluid to the external and the outlet of the externaly to the radiator? Would this make any difference? Or should I just use the external cooler.

I will have to buy the tubing and fittings to use the radiator cooler. It's all hose to the external one now. I guess I can get some inverted flare fittings and an adapter for hose at the local parts store...

I don't have any temperature problems now, but I haven't driven it very far either.

Any advice is appreciated, as always!

Joe
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post #2 of 16 (permalink) Old Mar 23rd, 01, 09:45 AM
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Take advantage if your new rad has the tank for the trans. Run the trans line to the rad first then to the ext cooler. The ext cooler will lower the temp more than the rad will. If you go to the ext cooler first then the rad, the rad will actually negate having the ext cooler by raising the fluid temp.

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post #3 of 16 (permalink) Old Mar 23rd, 01, 10:56 AM
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Just installed an external cooler about a month ago. The manufacturer suggested it be installed just as Dennis described. They also said if you did not use your radiator cooler then the ext. cooler had to be a much larger unit.

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post #4 of 16 (permalink) Old Mar 23rd, 01, 11:38 AM
 
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One more question. If you have an A/C condensor in front of your radiator, where would you mount the transmission cooler?
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post #5 of 16 (permalink) Old Mar 23rd, 01, 11:43 AM
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I mounted mine in front of the A/C Condenser towards the passenger side of the car. Don't know if that was the proper thing to do but everything seems okay.

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post #6 of 16 (permalink) Old Mar 23rd, 01, 08:04 PM Thread Starter
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Thanks for the info guys.

The reason I was thinking of going to the external cooler first was to get the hottest oil to the coolest cooler first, like a countercurrent heat exchanger. That's usually the most efficient method for heat transfer (at least in industrial applications. But these are liquid/liquid heat exchangers).

If the radiator is running at 180-190F, that is as hot as the oil could get (from the radiator). Don't know what the best temperature is for tranny fluid.

I had also read in some of the posts here that using an external cooler could "over cool" the fluid so that it never came up to operating temperature. I don't know if that is really an issue or not. The external cooler is pretty small, anyway.

Any thoughts?
Thanks again
Joe

------------------
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[This message has been edited by Joe G (edited 03-23-2001).]
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post #7 of 16 (permalink) Old Mar 24th, 01, 03:24 AM
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As far as over cool goes, Perma Cool says the ext. cooler only needs to be bypassed in very cold climates. I don't think CA or SC would be included. The guy that I bought my 700r4 from said he likes to see the trans. temp from 150 - 160. That sounds pretty cool to me given, like you say the temp of the radiator 180-190. So, if the ext. cooler would bring the temp. on down after the radiator then I would guess that's what we are after. I plan to stick with the recommended setup and probably add a trans. temp gauge before the weather gets too hot.

Maybe you can get some more info here http://www.permacool.com/Catalog/Cat_page02.html they seem to have some pretty good products maybe you can get an idea of what your after.

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post #8 of 16 (permalink) Old Mar 24th, 01, 08:40 PM Thread Starter
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Thanks. I didn't realize the tranny temp needed to be cooled that much, but it makes sense. Cooler is better. I'll install it going to the radiator first.

Thanks again
Joe

------------------
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post #9 of 16 (permalink) Old Mar 26th, 01, 04:23 AM
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I run a 4500 RPM 8" stall on the street. That puppy will bake tranny fluid quicker that you would think. I ran the lines from the transmission (powerglide) and ran it to a rather large cooler. The tranny dropped from a high of about 275-300 degrees to just over 200. I also switched to Mobil1 synthetic fliud. I then mounted a 9" electric fan to the cooler. Now, running on the street, with the fan, the tran stays between 170 and 190. Not to bad for about $125 worth of parts.

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Mark

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post #10 of 16 (permalink) Old Mar 26th, 01, 07:35 AM Thread Starter
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Thanks, Mark. That's a pretty radical stall for the street, I would think!
Must be fun..

Joe

------------------
69 396 w/SS Trim, B&M TH400, 3.55 12 Bolt Posi, Blue w/White Z28 Stripes, Chrome Rally Wheels
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[This message has been edited by Joe G (edited 03-26-2001).]
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post #11 of 16 (permalink) Old Mar 26th, 01, 07:41 AM
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I bought a contenital converter friday and they recomend just an external cooler without the radiator. he said in calif its no big deal

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post #12 of 16 (permalink) Old Mar 26th, 01, 08:35 PM Thread Starter
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Bypassing the radiator would certainly make it an easier installation, since that's the way it is now.

Thanks
Joe

------------------
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post #13 of 16 (permalink) Old Mar 27th, 01, 04:31 AM
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Joe,

You might want to talk with a tranny guy before bypassing the radiator to make sure you get the right size external cooler. Stuff like converter stall speed and how you drive will effect how much heat the tranny generates.

Personally if the radiator has the core why waste it! It isn't that hard to plumb... If it doesn't make sure your ext cooler is the proper size to do the job!!

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...Dennis
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post #14 of 16 (permalink) Old Mar 27th, 01, 05:17 AM
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Dennis is spot on about talking to the trans people first. I called B&Ms tech line before plumbing mine in. The reason they tell you to run through the radiator first is to pre-heat the trans oil first. they said trans oil would remain cool for quite awhile just using the trans cooler.Run the oil through both coolers.

Brian.
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post #15 of 16 (permalink) Old Mar 27th, 01, 06:45 AM
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You cant over cool a tranny. Think about it, your firmest sharpest shifts are always when you first fire the car up and havent driven far.

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