Hey guys I’m a 17 y/o trying to learn about rotaries and really trying hard to work on this car myself but I have to throw the towel in on this one and really hope someone can help. The leak only starts to occur if I drive longer than 30 mins and I hope you can see the trail it’s leaving dripping down and burns off into white smoke for a few seconds.

 

Sooooo stock, rare to see. Nice! It's coolant or oil. from the location it screams the turbos, which have quite a few connections for both. Best bet is warm it up till it's smoking and then give it a smell, that should tell you which fluid it is.....then the fun begins. Could be a loose connection, could be much worse. Based off the stain I'd say oil, but there are better people than me here. I'm sure Dale will be along shortly with the answer along with more info than most would need. But I'd honestly start with a sniff test....it IS a 25 year old car after all.

Welcome to the forum. Welcome to the weirdness that is the RX7, where everything is the same yet completely different from a piston engine. Never be afraid to ask a question, just do a decent search first to see if it's been asked before. Don't be afraid to do some research, there's so much awesome weirdness to learn!

 

fully stock, production number 100 US spec. But I know for a fact it’s oil. Guessing it’s a seal because I checked multiple times and can’t find lines leaking

 

The turbos have hard lines supplying both of them, they're fed off the front iron, and then Y into each turbo. Plenty of us have spare twins lying around if it comes to needing a set, if it's more than just a loose nut.

 

It looks like the source is actually above the turbos and is dripping onto the turbo heatshield. If so, the source could be oil leaking past the turbo shaft seals and getting blown into the Y-pipe and intake ductwork (leading to the intercooler), where it drips down from one of the following:

a. a leaky Y-pipe O ring,

b. a loose or split big rubber coupler on the top of the Y-pipe, or

c. a loosely clamped hose leading from the Y-pipe nipple to the air bypass valve (blowoff valve).

 

Is the car getting a normal 10-8-10 boost psi to redline?
I thinking you have a broken rubber y-pipe coupler that leaks pcv recirculation oil. Extremely common failure point.

 

The air Y-pipe on top of the turbos is made in 2 halves, the halves join with an O-ring seal. The area where they meet looks packed full of crap, that O-ring may have failed.

There is typically some oil mist that can drip from that spot if the O-ring is bad/old. Also if you change your oil, use a funnel when pouring in new oil. If you just dump the bottle in the oil can go down the PCV pipe to the primary turbo inlet and you've got oil mess there.

Get a new O-ring (should be cheap from Mazda) and swap that out. If the other rubber parts around there are baked hard you may want to replace. That's not a hard spot to get into and work on.

Dale