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Old 12-03-2013, 10:27 AM
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Transmission Pressure Booster Stock Applications

I don't plan on any mass or major HP mods to my '08WK, maybe a CAI at most. I do want to make the drive train last as long as possible however. In a stock setup would the tranny still benefit from the pressure booster or would it be a waste?

45RFE 545RFE Transmission Pressure Booster Sonnax 44957-LB2 45RFE 545RFE Electric Line Pressure Boost
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Old 12-03-2013, 10:49 AM
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Re: Transmission Pressure Booster Stock Applications

Never have seen any test results on this, but the increase of the line pressure will make the shifts quicker and the holding power of the clutches will be bigger, reducing the change of a slipping clutch. On the other hand there is always a time that during the shift one clutch did not release yet and the other clutch already partly engaged. This time is called the overlap and the longer this time or the higher the line pressure, the bigger the clutch wear will be. For that reason I think that increasing the line pressure only will not help reducing wear. It would be better to do the line pressure increase together with a shiftkit, where the shift overlap time will be reduced by the use of stronger accumulator springs.
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Old 12-03-2013, 12:40 PM
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Re: Transmission Pressure Booster Stock Applications

Quote:
Originally Posted by Frango100 View Post
Never have seen any test results on this, but the increase of the line pressure will make the shifts quicker and the holding power of the clutches will be bigger, reducing the change of a slipping clutch. On the other hand there is always a time that during the shift one clutch did not release yet and the other clutch already partly engaged. This time is called the overlap and the longer this time or the higher the line pressure, the bigger the clutch wear will be. For that reason I think that increasing the line pressure only will not help reducing wear. It would be better to do the line pressure increase together with a shiftkit, where the shift overlap time will be reduced by the use of stronger accumulator springs.
+1 Well said.
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