13b 4port turbo smokes when i let off
 

im on the dyno here is the video url http://www.youtube.com/watch?v=G-tLnJOGWlk
any commentes will help thank you

Have the same year car as yours. Looks like you are running the same cartech kit as I have. How many miles do you have on the motor? How many on the turbo system?

Nice looking car. :)

Well that's a problem I don't realy know much about the car one thing I know is that the car pulls really good and yes is a cartech 40 idf webber so what you think ? Have you seen this before?

Well, if we knew a little more about the car it would help. As it is, will take a stab at what it may be. My 94 did the same thing. Engine oil control rings were going as was the compression. At the suggestion of Cam at Pettit, he said to remove the oil filler cap & see what happened. I did & my car quit smoking like yours is doing on a hard run. From what I can figure, the crankcase was pressurizing under turbo use & then when I let off, all of that pressure had nowhere to go but back into the engine. Changed out the pcv & other valves but didn`t help so left the oil filler cap off & just put a rag over the top of the filler tube with a rubber band around it. It worked OK for another 15K miles or so until I replaced the engine recently.

Another thing to throw out there is the possibility that the turbo needs rebuilding. Mine needed a rebuild after about 50K miles of use. Corky Bell recommended John Meyers turbochargers in Alabama I think it was. They are no longer in business from what he told me the last time I talked to him earlier in the year. You would need to take off the inlet pipe to the compressor housing on the turbo & feel how much side to side & in & out play you have on the shaft. If it is excessive, you probably have a bad turbo unit. Garrett turbochargers are out there cheaper than what they used to be so finding one would not be hard. I believe it is a T04B unit. Corky at Cartech could tell you for sure. I have been told that you can tell if the turbo is leaking oil by starting it up from a cold engine. It may smoke for a few seconds but should clear right up. After about 30 seconds or so, if the car starts burning oil, the turbo is leaking & will need replacement.

Have you just recently bought the car from someone else since you don`t know much about it? You could talk to them & find out about the mileage on the motor & turbo system.

Well my mechanic told me he has to take the engine apart he's telling me the compression is good but oil seals are bad but I came to you guys to have another opinion.I have seen cars with bad oil seals and they smoke constanly my only does it at hight rpm when I let off

Is this the first RX7 you have owned? Does the mechanic you are talking to work on very many rotaries?

Yep the first time and the mechanic work on rx7 for 20 years

Out of curiosity, do you know how much boost your car is doing?

8 pounds. In that dyno run the car did 240

1. Too large of oil supply line to the turbo without a restrictor.
2. Too small of a drain line from the turbo or perhaps it is kinked.
3. Not enough oil pan (crankcase for lack of a better term) venting.

I took the cap off put rag on there and drove 15 miles no smoke at all I'm still gonna test it tommorrow and but it looks good for now I'll let you know thanks very helpful