Power Steering FAQ

We’ve compiled some of the most common questions we receive regarding power steering systems or components. Do you have a question not answered here? Send us an email using our Contact Form and we’ll help provide you the best information possible!

What is different about a Turn One pump compared to my factory pump?

Turn One starts with a new OEM pump, not reproduction or refurbished parts, and we modify and customize-tune the internal components for specific flow and pressure settings. This allows our pumps to operate with less draw on the engine, reducing horsepower consumption and also lowering fluid temperatures compared to stock systems.

Why does my pump expel fluid out of the cap during high performance driving events (autocross, road racing, oval track racing, etc)?

Some cap “venting” or “purging” can happen even in normal conditions, but excess fluid venting is a symptom when the power steering pump is overheating fluid. Pump reservoirs have calculated air volumes to compensate for fluid expansion as the system warms up during vehicle use. Under normal driving conditions, steering systems reach a normal maximum operating temperature and the reservoir accommodates normal fluid expansion. When the pump is overworking under high performance driving conditions, the fluid temperatures exceed normal conditions, therefore expanding beyond the calculated air volume in the reservoir. This causes the system to purge the fluid out of the valve in the cap. Most reservoirs have both “Low” and “High” fill level markers. It is common for vehicles that see high performance driving conditions to fill to “Low” level to aid in preventing purging.

How do I fix over heating problems in my steering system?

There isn’t necessarily one exact answer to ensure you are best combating temperature issues in your steering system, but most heat issues can be traced back to the power steering pump and the pump’s inability to adequately handle the conditions and steering setup of your specific vehicle. Remember, 99% of stock steering systems were NOT designed to see high performance use. Aggressive driving combined with common vehicle modifications like wide and grippy tires, customized steering geometry, and hydroboost braking systems all require power consumption from the steering system – and pump.

Turn One pumps are designed to perform specifically with these types of vehicle modifications. By changing internal components, we are able to lessen flow within the pump, reducing horsepower consumption needed to build pressure in the system. The reduction in flow also lowers friction heat in the fluid, which allows the pump to run cooler than stock pumps. In most applications, fluid temperatures will be significantly reduced to alleviate over heating issues and problems. We also customize pumps to ensure you’re pump is able to build enough pressure in the system to turn those big wheels while plunging into a tight corner.

What is the maximum steering system operating temperature?

Turn One recommends 275º F as a maximum fluid temperature, as measured in the reservoir.

What is a flow restrictor and what does it do?

The flow restrictor reduces the output flow of the pump by decreasing the orifice size in the fitting. By doing this, it increases the steering effort and gives you a more positive feel in the steering wheel. When matched properly with other components, reducing the flow has no adverse affect pump operation. In fact, many steering gears like rack and pinions on imports and Mustang were designed to operate with a lower flow rate.

How do I install a flow restrictor?

The Turn One flow restrictor is designed to replace the factory restrictor. To install the restrictor, you first must remove the factory restrictor. The factory restrictor is the unit which the high pressure line interfaces with the pump. Using a 22mm socket/wrench, unscrew the factory restrictor and install the Turn One flow restrictor in its place. Tighten the new restrictor to 40 ft-lbs.CAUTION: When removing the factory restrictor, there is a spring loaded plunger behind the restrictor. If the plunger and spring fall out of the pump, install the spring first and then install the plunger with the hex-nut end first.

What power steering fluid should I use?

We recommend using a brand name synthetic power steering fluid with Turn One components. We carry Red Line and Driven – both are quality fluids that our customers have had great success with.

How do I bleed the power steering system?

We recommend bleeding the power steering system of any old fluid when replacing any old steering components to ensure you have fresh, clean fluid with your new parts. Start by lifting the front wheels of the vehicle off the ground. Remove power steering hoses from the pump or steering unit. Place drain pan under front of vehicle. Cycle steering from lock to lock until system is purged of the majority of fluid. This usually takes 12+ full cycles. NOTE: There will still be some residual fluid left in the system. This will mix with the new fluid, and will not cause any adverse side affects.

How do I purge air from the power steering system?

Once your new steering components are installed, it is necessary to purge any air in the system prior to driving the vehicle. To purge, first lift the vehicle so that the front wheels are off the ground. Add fluid to the reservoir so that the fluid level registers on the dipstick. Without the engine running, slowly and smoothly cycle the steering from lock to lock, making sure the reservoir doesn’t go dry. Continue this process until no air is present in the fluid (usually takes ~20-30 full cycles). With the front wheels off the ground, start the engine and make sure the reservoir level doesn’t drop significantly. If it does, add fluid so that the fluid registers on the dipstick. Cycle steering from lock to lock, again until no air is present in the fluid. Shut engine off and set the reservoir fluid level to the “cold” setting on the dipstick. The power steering purging procedure is now complete. If you have problems with this process, please contact us for further assistance.