Subaru Specific Dyno Tuning Info

How can I prevent cracking a ringland?

Most people are quick to say the factory pistons are weak. Yes, they will not have the strength of a forged piston, but with the proper driving techniques, tune, and modifications, they can last quite a while.
● Get an air oil separator or catch can. We recommend an AOS for simplicity. They are low maintenance and are self draining back to the crankcase. Unlike the catch can which would have to be monitored and emptied before it’s full. With a catch can, you may have to monitor the oil level and top off as necessary. The reason for the need of one of these is that an engine develops crankcase vapors that are routed to the intake and burned through the engine. Not good for making consistent power. Oil is introduced through the intake system, through the intercooler and burned in the combustion chamber. Coating the inside of the intercooler, causing it to lose efficiency. Then into the combustion chamber where oil will lower the rated octane inside the combustion chamber, causing knock.
● Driving habits are a huge factor too. High load/low RPM puts a lot of stress on an engine. Believe it or not, it’s actually safer to have your car up in the revs in high boost. Lugging the car around in boost causes heat. For example if you are riding around in 5th or 6th on the highway, it’s advised to not let the car build full boost at cruise rpm for a while. Downshift if you need to get into more than a small amount of boost. There is a lot of cylinder pressure at those levels for the factory pistons.
● Lastly, compile it with a tune that will go along with your driving style of the car. A good calibration is key here.

It does more than prevent cracked ringlands, but our coolant balance kit is a good way to improve the engine operation with very low cost to entry.

How can I prevent a spun bearing?

We are all familiar with subaru’s bearing issues. Here are some tips to help prevent a spun bearing:
● Use a good brand of oil, heavier than recommended. 5w40 or 10w40. When the oil gets hot, oil pressure lowers. Thus why we do not recommend 5w30 oil being used. When on the dyno or street use, you are putting a great amount of load on the car. The thicker oil acts as a cushion between the bearings and crank.
● Change your oil on time. Based on driving style and conditions it may be wise to change the oil before 3,000 miles