If you've ever installed a wideband in a custom location, the manufacturer instructions warn against installing it on the underside of a pipe where condensation could pool. You always install it at the top of the pipe. I don't think it's a question of chemical damage, more cracking due to uneven heating (since it heats from the inside). It's a ceramic material after all.

Long term water injection might be fine, dumping a bottle in one sitting might cause too much condensation after the car is turned off, or dumping water into a cold motor could cause droplets in the exhaust.

His car is burning too much gas and throwing a lean code, so the symptoms fit. We need OBD data to know more.

 

Yeah water/meth injection and sucking a container full of water and oil into the intake manifold are two different things. Also, while those rotors look clean, an engine lasting 20k is nothing to brag about.

 

The engine was fine when it was torn apart. We have rx7 guys taking apart engines because they are blowing up turbo's. The engines are lasting longer than their turbo's are. This person took his apart because his t04Z gave up and he decided to take a peek at his internals. Running around 450WHP on his car he decided to look at the engine when he put in his EFR 8374.

The key to keeping a rotary happy is 2 cycle oil, proper rebuilds, as much water/meth the engine can take, a strong ignition, and running cool around the spark plug holes.

Obviously getting the tune. You need to get the ignition as close as possible to where it needs to be as retarded timing can eat the seals and a turbo quickly.

My friend tore up his motor from a bad tune.

The rx8 I suspect to be similar. Carbon in these engines eats them, and running water through them is perfectly fine, people run water through earlier gen rx7's and this engine will benefit from water treatments.

I say, if the engine is still carboned up, run more water through it or run it more frequently.

I don't run a cat convertor, water being thrown into the exhaust runs super hot and can damage cat convertors, so if you leave it in, sip the water more slowly and let it cool down, its going to take a while to do the water treatment. I wouldn't mix oil with the water.


Just for a FYI, the engine is the strongest part of the rx7 for tracking, transmissions, differentials are the weak links as are turbo's. If you track an rx7 hard, its tough keeping the tranny together, the diff cool, and turbo's eat themselves alive. the stock twins are actually pretty robust.

 

Thank you for your vast knowledge, who would of thought that tuning is important on a turbocharged engine. You are probably the first person in history to state that the engine is the strongest part of the RX-7 and that the RX-7 5 speed trans is weak,


Also, you are not the first person to make the mistake of using RX-7 personal theory on the RX-8.