Originally Posted By: clinebarger
Originally Posted By: Farmer
Originally Posted By: clinebarger
Depends on many factors.....Health of the unit, Health of the pump, Is the cooling system up to the task? More pressure equals more heat!
I don't build many 545RFE's but I've built quite a few of it's big sister...The 68RFE, I use the Sonnax line booster kits on every one!
I've used that line booster before. It does absolutely nothing for line pressure. It's a waste of money unfortunately. Line pressure is still at 160. However with a properly built 68RFE you can go to 225-250.
My mechanical pressure gauge disagrees with you......LOL
If you are trying to read the line boost via a scan tool, It will read the same as stock.
The Sonnax line booster is placed between the TCM & Pressure Transducer, The TCM will now see a lower pressure vs commanded PCS duty cycle. The TCM will now command increased PCS duty cycle to compensate for the false readings.
Of coarse this will not produce 250 psi of max forward line pressure that a 68RFE behind a 900# torque modified Cummins will require, Nor was it ever meant to. But it WILL produce the 20-25 psi increase.
I tend to concur with Farmer that this line pressure booster is a waste of money.
Agreeing that a line pressure booster does provide increased line pressure (depending on the spring rate in use), however this increased line pressure does nothing (borrowing a word from Farmer) to the varying actuating pressures of the respective clutch pistons (of various speed) as these clutch actuating pressures are generally very far lower than that of factory set line pressure.
Transmission supply line pressures are not actuating pressures of combinations of various clutch housings/pistons of various (gear) speeds.