What size trans cooler do I need? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 11-05-2005, 06:31 PM
84Z 84Z is offline
Gas Raper
 
Join Date: Dec 2003
Location: WI
Posts: 198
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What size trans cooler do I need?

Have a 4500 stall converter with a th400 transmission. Has a trans brake and engine is pushing 597 flywheel hp with an additional 300 shot of nitrous at about 6500 rpm. Rear end ratio is 3.73. What size trans cooler / what gvw cooler do I need, thanks.

Brandon

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-05-2005, 11:34 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
depends on how hot the trans is getting.... honest.

BIG and use a bypass thermostat is the best idea.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-06-2005, 07:29 AM
Member
 
Last photo:
Join Date: Nov 2004
Location: Lakeland FL
Age: 65
Posts: 4,110
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
if "BIG" is a mounting problem or gona block to much radiator air flow....think about 2 smaller units hosed in series, maybe one on the rad and one down in the gravel pan

ha!....the trans cooler from hell!....us a A/C evaporator....now that is "BIG"!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-06-2005, 07:52 AM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Bar under the dash
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,082
Wiki Edits: 1659

Thanks: 328
Thanked 99 Times in 95 Posts
Quote:
Originally Posted by 84Z
Have a 4500 stall converter with a th400 transmission. Has a trans brake and engine is pushing 597 flywheel hp with an additional 300 shot of nitrous at about 6500 rpm. Rear end ratio is 3.73. What size trans cooler / what gvw cooler do I need, thanks.

Brandon
I am curious what the car will be used for.

A trans Brake valve body operates the trans at a high main line pressure. This heats the fluid up besides the heat from the high stall speed converter you have.

If the car is street driven much , a larger cooler will be needed. At the drag strip only, a smaller cooler could be used.
__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-06-2005, 10:47 AM
84Z 84Z is offline
Gas Raper
 
Join Date: Dec 2003
Location: WI
Posts: 198
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
it's for a 84 camaro street/strip car, mostly street, any idea about what size gvw would be good, or should i just go for one of the biggest they have like 24,000 gvw? Is overcooling a problem or is it fine? Thanks, and sorry for the noob questions, never dealt with automatics before. Thanks.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-06-2005, 04:18 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by 84Z
it's for a 84 camaro street/strip car, mostly street, any idea about what size gvw would be good, or should i just go for one of the biggest they have like 24,000 gvw? Is overcooling a problem or is it fine? Thanks, and sorry for the noob questions, never dealt with automatics before. Thanks.
Just be sure to use a bypass thermostat... They are only about $ 20 and prevent the trans from getting too cool when operating and make it warm up quicker when it is cold.. you can use the radiator cooler if you want to. I like them for warm ups.

What's the big deal here.. Hasn't anybody ever heard of one before????
Has anybody ever seen a rusty trans dipstick from too cold of oil???
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-06-2005, 05:03 PM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Bar under the dash
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,082
Wiki Edits: 1659

Thanks: 328
Thanked 99 Times in 95 Posts
Quote:
Originally Posted by xntrik
What's the big deal here.. Hasn't anybody ever heard of one before????
Has anybody ever seen a rusty trans dipstick from too cold of oil???


No , I have not.

With the 4500 rpm stall speed converter and a trans brake / full manual shift tranny he says the car has, I doubt the tranny running too cold will be a problem
__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-06-2005, 05:11 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
cooler thermostats at JEGs....

http://www.jegs.com/webapp/wcs/store...0535&langId=-1
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-07-2005, 07:47 AM
Member
 
Last photo:
Join Date: Nov 2004
Location: Lakeland FL
Age: 65
Posts: 4,110
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
you do need to know what is the temp now.... as xntrik asked in the first post to determine cooling needs

best advise I can give with no temp info: phone the tech lines at Hayden, B&M, etc. and ask what size they recommend....they may know from experience
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 11-07-2005, 11:02 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by red65mustang
you do need to know what is the temp now.... as xntrik asked in the first post to determine cooling needs

best advise I can give with no temp info: phone the tech lines at Hayden, B&M, etc. and ask what size they recommend....they may know from experience
If you use a big cooler and the thermostat I suggested, the temperature is irrelavent.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 11-07-2005, 11:47 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
To answer a PM here:

Yes I have seen a rusty dip stick above the oil level because the oil was staying too cold and the condensation not being evaporated from the ATF. And it was Mobil 1 ATF. Sure the real cool oil is good for parts.... but the water is NOT.

The thermostat splices into both of the lines. When the oil is cold the output oil from the trans is routed directly back into the trans bypassing all cooler function until the thermostat opens the path to the cooler. That makes the transmission warm up faster and maintains a minimum operating temperature just like an engine radiator thermostat does.

Just like an engine coolant radiator, the size of the oil cooler and the airflow across it determines the maximum trans oil temperature.

Contrary to popular belief, the best place to put a transmission cooler is behind the radiator..... between the radiator and the mechanical fan. = Lots of airflow in all conditions and does not increase radiator coolant temperature.

check out site www.readershotrods.com drag cars/georges

Last edited by xntrik; 11-07-2005 at 11:55 PM.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 11-08-2005, 08:13 AM
Member
 
Last photo:
Join Date: Nov 2004
Location: Lakeland FL
Age: 65
Posts: 4,110
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
xntrik, Ha! you got me,

weird....? B&M offers and recommends the same bypass thermostat for their oil coolers.....don't say anything about using it with their tranny coolers

(edited from $20)...$40-60 to know the oil is not "too thick" on a cold day......good plan

(xntrik, $20 if you fab your own ???....just messin')

Last edited by red65mustang; 11-13-2005 at 05:52 AM.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 11-08-2005, 11:11 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The Jegs add link I gave shows specifies them for transmission coolers at $ 40 plus fittings.... $ 60 so what?
Hey, they work, used one for years.

Let's all help each other learn.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 11-11-2005, 03:20 AM
M&M CUSTOM's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Transmission identification
Last journal entry: 1988 Suburban, the project continues.
Last photo:
Join Date: Mar 2003
Location: Northwest Pennsylvania.
Age: 43
Posts: 2,231
Wiki Edits: 9

Thanks: 0
Thanked 1 Time in 1 Post
Until this thread- I have never seen or heard of a transmission suffering from being too cold either, and exactly how were you made aware your transmission fluid WAS indeed not warm enough to evaporate moisture out of itsself? This would be more of a problem in Canada, than Arkansas, and then limited to the cooler months of the winter.

All irrelevance aside the subject here is not enough cooling and what is a figure to go by for enough?

You cannot accurately go by the GVW rating put forth on most of the coolers sold by nearly everyone who sells aftermarket coolers.

A rough generalization is still only a guess, but if you intend on running street with that and want to keep a better eye on it a- transmission temperature gauge with the sensor mounted in the transmission pan would be the BEST starting point. Several threads here on Hotrodders have indicated the pan is THE BEST source of transmission fluid temperature for accuracy. Only after you know how much over the optimum 175(f) degree temperature you are, can you make the most effective purchase of cooler for YOUR particular needs.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 11-11-2005, 10:32 AM
Member
 
Last photo:
Join Date: Nov 2004
Location: Lakeland FL
Age: 65
Posts: 4,110
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
M&M,

Typical cooler will lower the fluid temp anywhere from 80 to 140 deg in series with the radiator depending on the ambient temp/amount of air flow (vehicle speed)/gpm of fluid.....not hard to be "to cool" on a cold day

Agree a $50 guage is worth the money because ATF viscosity (thickness) is so sensitive to temp changes:
kenetic velocity@ 40*C (112F?)=36
kenetic velocity @ 100*C (212F)=7.5

(and now to prove I'm crazy)
Don't have a oil/tranny temp guage...use a turkey oven thermometer ($5?)...the trick was a hand full of plumbers putty and aluminum foil on the steel trans oil line to get a good "ballpark" reading....175*=beef well done!

xntrik, thanks, the bypass thermostat (on my xmas list) beats hell out of my 2 coolers in parallel in summer, 1 in the winter plumbing mess!

Last edited by red65mustang; 11-14-2005 at 08:46 AM.
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
First time trans rebuilder...need tips! 4 Jaw Chuck Transmission - Rearend 14 06-23-2004 02:29 PM
????about putting a trans cooler on??? Robbie Transmission - Rearend 1 04-17-2004 08:53 PM
Trans Down Shifting 71gtx Transmission - Rearend 0 04-15-2004 06:33 AM
Allison Trans deseldr Transmission - Rearend 5 10-19-2003 07:45 PM
Turbo 350 Trans cooler Redshiba Transmission - Rearend 3 09-02-2002 09:17 PM


All times are GMT -6. The time now is 12:38 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.