I performed a pressure test on my 700R4 today and called Bowtie Overdrives to confirm results.
08-16-2001, 11:07 PM
#1
Melting Slicks
Thread Starter
I performed a pressure test on my 700R4 today and called Bowtie Overdrives to confirm results.
Here are the results obtained based on the BTO directions provided with the 300 psi gauge:
_____Pressure @ idle,________Pressure @ idle,______Pressure at high idle,
_____T.V. disconnected_______Minimum T.V.________Full T.V.
-----------------------------------------------------------------------------
Park________72_______________72_________ ________180
Reverse_____135______________135________ ________240
Neutral______72_______________72________ _________180
Overdrive____72_______________72________ _________180
Third________72_______________72________ _________180
Second______180______________180________ ________180
First________N/A______________N/A_________________N/A
-----------------------------------------------------------------------------
After calling BTO, I was referred to a guy named Chris. They said he was the “transmission pressure guy”.
Chris said that the pressure values that I reported sounded fine to him. He asked me to pull ~1/16 of an inch on the T.V. cable to see if there was an immediate indication of pressure increase on the gauge and there was. That was just another indication that the T.V. cable was adjusted correctly.
I told him that my 1-2 shift was WAY too soft and he recommended having the transmission shop increase the pressure by replacing the throttle valve with a different one.
I am going to increase the pressure more but at least I know now that I’m not doing any damage to my transmission due to too low of pressure for now.
I hope that this information will be usefull to someone in the future. (archive filler!)
(does anyone know of an easy way to post a "table" on the forum?) :rolleyes:
_____Pressure @ idle,________Pressure @ idle,______Pressure at high idle,
_____T.V. disconnected_______Minimum T.V.________Full T.V.
-----------------------------------------------------------------------------
Park________72_______________72_________ ________180
Reverse_____135______________135________ ________240
Neutral______72_______________72________ _________180
Overdrive____72_______________72________ _________180
Third________72_______________72________ _________180
Second______180______________180________ ________180
First________N/A______________N/A_________________N/A
-----------------------------------------------------------------------------
After calling BTO, I was referred to a guy named Chris. They said he was the “transmission pressure guy”.
Chris said that the pressure values that I reported sounded fine to him. He asked me to pull ~1/16 of an inch on the T.V. cable to see if there was an immediate indication of pressure increase on the gauge and there was. That was just another indication that the T.V. cable was adjusted correctly.
I told him that my 1-2 shift was WAY too soft and he recommended having the transmission shop increase the pressure by replacing the throttle valve with a different one.
I am going to increase the pressure more but at least I know now that I’m not doing any damage to my transmission due to too low of pressure for now.
I hope that this information will be usefull to someone in the future. (archive filler!)
(does anyone know of an easy way to post a "table" on the forum?) :rolleyes:
08-17-2001, 12:28 AM
#2
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St. Jude Donor '03
Re: I performed a pressure test
Thanks for the info, I'm about a day or two behind you for initial readings. It may be a while before I get to do the road test. :smash: (guess I'll need to put at least the driver's seat in it soon. :lol:
Glad your test went well. From what I have read, you should be able to change the soft shift by adjusting the TV cable. :confused: Maybe someone can educate us on it. Steve at BTO indicated that the shift personality was a function of tv adjustment.
Dave
[Modified by Rolling Thunder, 10:30 PM 8/16/2001]
Glad your test went well. From what I have read, you should be able to change the soft shift by adjusting the TV cable. :confused: Maybe someone can educate us on it. Steve at BTO indicated that the shift personality was a function of tv adjustment.
Dave
[Modified by Rolling Thunder, 10:30 PM 8/16/2001]
08-17-2001, 05:28 AM
#3
Team Owner
Re: I performed a pressure test on my 700R4
I will admit I really don't know a whole lot about auto trannies...but over the years I have heard that Trans-Go will actually REDUCE the line pressures while increasing firmness on shift....as it's handled in differant ways like accumulator mods, etc....reduced line pressures make seals last longer, I"d think...anyway....
not to mention pump life and operating efficiency/cooling....
but this thing of the TV in a 700r4 is a newbie to me,....so I"m not so sure about them...seems strange to be modulating pressures with a TV cable/valve...
GENE
not to mention pump life and operating efficiency/cooling....
but this thing of the TV in a 700r4 is a newbie to me,....so I"m not so sure about them...seems strange to be modulating pressures with a TV cable/valve...
GENE
