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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Jun-02-2019, 06:21:56 AM   #21
Nambo
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Default Re: HOWTO: SMG Accumulator Pressure Test

Good info. Another damn thing to add to the list
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Old Sun, Jun-02-2019, 08:55:25 AM   #22
SteveEvans
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Default Re: HOWTO: SMG Accumulator Pressure Test

What does <F6> Activate do?

Steve
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Old Sun, Jun-02-2019, 09:09:52 AM   #23
SMG cog light
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Default Re: HOWTO: SMG Accumulator Pressure Test

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Originally Posted by WOLFN8TR View Post
Shift and F6



E46 Transmission and M-Gearbox



F5





This only shows the pressure of the smg pump that is built up by the electric motor in bars (45-80 bars in smg 2) It doesn't show the pre-charge of the nitrogen inside the accumulator in psi. (29-41 psi good accumulator) anything less than 29 is defective and needs to be replaced.
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Old Sun, Jun-02-2019, 09:10:58 AM   #24
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Default Re: HOWTO: SMG Accumulator Pressure Test

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Originally Posted by SteveEvans View Post
What does <F6> Activate do?

Steve
Activate will allow you to manually turn the electric motor of the pump on and off to prime up pressure.
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Old Sun, Jun-02-2019, 10:24:26 PM   #25
Trans3900
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Default Re: HOWTO: SMG Accumulator Pressure Test

IMG_0492.jpg

Would you say this pressure values look ok to you? My pressure goes to 46 the most and then goes down to zero. When can we say an accumulator is bad? also i have to mention i have done the up resistor and the bottom
the up is with an 680 resistor didnt do a thing to my shifting , keep going from 1 and R to N after maybe one min. at the bottom i have a 10k resistor
worked for a while the night i did the installation then next morning it didnt switch gears at all. any advices or tips you can give me

Note
what i have replaced so far

1. Smg Motor
2. Salmon Relay
3. Cooling level 2
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Old Sun, Jun-02-2019, 10:50:39 PM   #26
WOLFN8TR
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Default Re: HOWTO: SMG Accumulator Pressure Test

Here is a video of my SMG pressure while driving. The lowest pressure is still higher than yours. I would say you have a bad accumulator but Iím no SMG expert.

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Old Sun, Jun-02-2019, 11:49:26 PM   #27
Trans3900
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Default Re: HOWTO: SMG Accumulator Pressure Test

Afrer seing your vidieo, i came to my conclutions that i should change my pressure Accumulator. I dont even get to drive the car my pressure doesnt hold or goes any near 50. thank again for your video, now does anybody has the DIY for the Pressure accumulator and i should change the temp Sensor on the SmG since it will be easier to do is that correct ? Btw. I think the low hydraulic temp is due to the resistor Mod

Last edited by Trans3900; Mon, Jun-03-2019 at 12:47:56 AM.
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Old Mon, Jun-03-2019, 01:25:18 PM   #28
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Default Re: HOWTO: SMG Accumulator Pressure Test

Quote:
Originally Posted by Trans3900 View Post
Attachment 215792

Would you say this pressure values look ok to you? My pressure goes to 46 the most and then goes down to zero. When can we say an accumulator is bad? also i have to mention i have done the up resistor and the bottom
the up is with an 680 resistor didnt do a thing to my shifting , keep going from 1 and R to N after maybe one min. at the bottom i have a 10k resistor
worked for a while the night i did the installation then next morning it didnt switch gears at all. any advices or tips you can give me

Note
what i have replaced so far

1. Smg Motor
2. Salmon Relay
3. Cooling level 2
1. Are you saying that you have both the top and the bottom resistor on at the same time?

2. And if you put a 10,000 ohm resistor, you need to remove that ASAP 1,000 is plenty and 3,000 is already too high. Doing a resistor mod will make your motor fail prematurely also. 10K resistor; That will literally kill your motor. The max pressure that the pump builds is also dependent to the hydraulic fluid temperature. The accumulator is what holds the pressure that is built up by the pump. Right now you are not building sufficient pressure. That is not an accumulator problem. That is either a dead/failing motor or that resister.

3. Do the live data readings again after you removed the 10k resistor.
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Old Mon, Jun-03-2019, 01:28:51 PM   #29
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Default Re: HOWTO: SMG Accumulator Pressure Test

Quote:
Originally Posted by WOLFN8TR View Post
Here is a video of my SMG pressure while driving. The lowest pressure is still higher than yours. I would say you have a bad accumulator but Iím no SMG expert.

https://youtu.be/2YpgQ_vxzNk
How long does it take for your motor to come back on after the pressure decays and the motor have to prime again without shifting?
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Old Mon, Jun-03-2019, 01:47:41 PM   #30
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Default Re: HOWTO: SMG Accumulator Pressure Test

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Originally Posted by SMG cog light View Post
How long does it take for your motor to come back on after the pressure decays and the motor have to prime again without shifting?
I actually responded to you in this thread about the SMG pressure drop and time. Post #29 down.
http://www.m3forum.net/m3forum/showthread.php?t=606540
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Build Thread - S54 Vanos Thread - Hi-Temp Oring Kits!

BAVSOUND Stage 1 - UltraGauge - Valentine One - Orion V4's - ARC-8's
TTFS Engine/SMG Tune/CSL 255 - SGT Headers/Sect 1/SCZA - Evolve Eventuri
VIS XTS CF Hood - CF Lip/Console/Diffuser - OE CSL Trunk - BWS 500S 9k/11k
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Discussing HOWTO: SMG Accumulator Pressure Test in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)