DODGE RAM FORUM - Ram Forums & Owners Club! - Ram Truck Forum - View Single Post - Sonnax 545RFE Line Pressure Booster
View Single Post
Old 09-24-2011, 07:03 AM
mgh's Avatar
mgh mgh is offline
Dodge Ram Forum Senior Member
Join Date: May 2011
Location: Delaware
Posts: 101
Gender: Male
Vehicle: 2009 Dodge Ram
Trim Level: Sport RCSB
Color: Black
Rep Power: 0
mgh is on a distinguished road

I have been monitoring line pressure since I installed my last trans 2 weeks ago. I have a CMR tune and when I had the dealer quick learn my trans, the pressure increase was only 5psi higher on the gauge than what the computer was reading without the Sonnax. Normal operating pressure in forward gears is 35 - 165psi. At full throttle, without the Sonnax, the max that I read was 175. With the Sonnax the max at full throttle is 225psi. I have also increased the pressure on the bypass spring in the pump to make the pump build more pressure. With the added pressure, the shifts are firm and quick, but not harsh.
Reply With Quote