Boosting Pressure on RFE - JeepForum.com
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post #1 of 8 Old 10-16-2020, 02:48 PM Thread Starter
Wabatuckian
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Boosting Pressure on RFE

Hello,

Anyone know how much pressure is safe to boost the RFE tranny? I've got it shifting where I want it at about +50psi increase.

Shouldn't be an issue, right?

Josh

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post #2 of 8 Old 10-17-2020, 07:53 PM
97Mule
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And how did you accomplish this boost in pressure?


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post #3 of 8 Old 10-18-2020, 11:48 AM Thread Starter
Wabatuckian
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Quote:
Originally Posted by 97Mule View Post
And how did you accomplish this boost in pressure?
Sonnax RFE booster, and one that used a resistor only.

My idea is to boost the initial pressure using the resistor, and the Sonnax unit gives an increase after that according to load, from what I understand.

Josh
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post #4 of 8 Old 10-19-2020, 09:08 AM
Mr. Bitey
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Where are you getting 50psi from? The Sonnax kit only gives up to 25psi at high pressure over stock and that's if you use the included pressure regulator spring. Have you programmed mods to the trans as well?
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2004 WJ, 4.7 N, daily driver.
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post #5 of 8 Old 10-19-2020, 11:09 AM Thread Starter
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The mods are not programmed yet, and shouldn't need to be because of the way the Sonnax operates. However, I'm purchasing a scanner in short order which will be able to put the transmission into quick learn mode.

I'm using the Sonnax RFE unit on top of a resistor unit. The resistor raises it 25 max, and the Sonnax unit raises it 25 max.

I don't like doing it this way, feels like hacking. However, since I'll be spending money on an advanced scanner in short order, I'll likely not have the funds for a performance programmer for a bit longer than I would otherwise, and therefore chose this route for the time being.

Josh
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post #6 of 8 Old 10-19-2020, 12:01 PM
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Quote:
Originally Posted by Wabatuckian View Post
I'm using the Sonnax RFE unit on top of a resistor unit. The resistor raises it 25 max, and the Sonnax unit raises it 25 max.
Sonnax units aren't supposed to be used with other mods. At least that is what Sonnax says. It likely will work fine - they might just say that because they can't guarantee the results of their product when used with other mods. As far as how much pressure is too much, I can't find anything that gives a definitive limit. But I do know the 545rfe is far more beef than the 4.7 needs and will take 400+ hp and/or ft/lbs without complaint...

I am content with the torque mod delete on mine so far - no changes to shifts unless I am to the boards and beatin' on her. I do have an HO slated to be rebuilt - when that build goes into service I have my eyes on the AirRam Stage 3 valve body for a fresh(ish) 545rfe with a stall for those snap-happy shifts and childish tire screamin' launches....
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2004 WJ, 4.7 N, daily driver.
1967 Jeep J100 panel truck (a-rusted development)
1970 'Cuda, 340 4bbl (10.952et @ 123mph)
1972 Dart Swinger, Gen III 6.4l Hemi (in progress)
1974 AMC Gremlin X, 440 6bbl (trailer queen, 9.466et @ 144mph)
1975 Jeep Cherokee Sport 2-door (in progress)
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post #7 of 8 Old 10-19-2020, 02:05 PM Thread Starter
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Quote:
Originally Posted by Mr. Bitey View Post
Sonnax units aren't supposed to be used with other mods. At least that is what Sonnax says. It likely will work fine - they might just say that because they can't guarantee the results of their product when used with other mods. As far as how much pressure is too much, I can't find anything that gives a definitive limit. But I do know the 545rfe is far more beef than the 4.7 needs and will take 400+ hp and/or ft/lbs without complaint...

I am content with the torque mod delete on mine so far - no changes to shifts unless I am to the boards and beatin' on her. I do have an HO slated to be rebuilt - when that build goes into service I have my eyes on the AirRam Stage 3 valve body for a fresh(ish) 545rfe with a stall for those snap-happy shifts and childish tire screamin' launches....
I have a Sonnax reinforced accumulator plate in my current valve body, and I have another valve body that I'll be rebuilding with a shift kit and reinforced accumulator plate. I don't want to put it in this transmission as it currently sets, however. I'm still deciding whether I want to learn to rebuild an automatic tranny or just order one for $1600. I'll have to save my pennies either way.

Faster shifts apparently help save clutch material, and I've always preferred fast shifts.

Josh
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post #8 of 8 Old 10-20-2020, 11:33 PM
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Quote:
Originally Posted by Mr. Bitey View Post
I have my eyes on the AirRam Stage 3 valve body
The core charge is 450$ lol the modification is 325$ thats pretty insane lol

have you put this in a wj?
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