There is a little confusion in discussions of the cooler bypass, especially when we are in an E4OD
discussion. The E4OD
didn't have a cooler bypass, but did have a rear fitting with a check ball in it. That rear fitting was designed to hold converter charge so you don't have an extended engagement time upon first startup in the morning. When we build an E4OD
, we build the pump for full time converter charge, so the converter is full before you can put it in gear. With this modification to the pump, it allows us the use fittings with no check valves for better cooler flow.
In regards to the 4R100
Cooler bypass: The bypass valve has a valve that operates from fluid pressure differentials primarily from fluid viscosity changes. The rear fitting is calibrated to play against the spring in the CBV. By design, even when the transmission is up to temperature, it will always bypass some fluid. It is never a 100% transfer of cooler fluid to the cooler. In fact, the exact flow loss is about 10% by design. Also, the failure rate of these valves is enough for me to never take the risk of using them again.
On to Cooler Bypass Delete kits: If you remove the cooler valve and leave the rear fitting valve in place, you increase restriction in the cooler line and reduce volume flow through the cooler since the spring pressure is now higher without it's designed counter pressure spring (the one in the cooler bypass valve). The proper way to delete the valve is to remove all the parts out of the rear fitting. We build a new fitting to do just that. Further more, since we don't need the "banjo" part of the either fitting, we made the fittings now shorter with only one washer and less leak potential.
Now, on a cool note. Since the case threads are the same in the E4OD
, you can simply use our new CBV delete kits to convert E4OD
cases to 3/8" cooler lines very easily. ------- If you have on of our builds or you will have delayed engagement every morning.