rfc_13

Alright here is the problem...I have 1987 TII, now about a month ago i noticed that when i would accelerate fast enough for my turbo to boost then let off blue small faint colour of blue would apear behind the car. Honestly didnt think a whole lot of it at first, but as the days went on its been getting worse and worse. For the last week ive been driving so slowly trying not to let the turbo spin up to much, even if i accelerate without the boost gauge moving, but can still here the turbo spool im getting a fairly large puff off blue smoke once i take my foot of the pedal. From what i have searched and read, im fairly certain this is caused by bad seals in the turbo, but im not 100%. When i bought the car, the guy i got it from said it had a rebuilt engine with under 5000kms on it, ive done roughly 4500km. It has RB exhaust, HKS induction kit, FCD, HKS boot controller. The body has 230000km and I think that the once the engine was rebuilt, the original turbo and intercooler were put onto it. If anyone could tell me what they think that would be great. Thanks.
Steve

TII

take the intake snorkle of and look to see if their is alot of oil in the turbo

rotorforce

Sounds like you might be getting oil into the turbo. I am not sure what the easiest and cheapest way would be to remedy the problem but I do know a couple of places where I have had my TII turbos rebuilt. turbocity.com and rotorsportsracing.com

Good luck

rfc_13

well i took off the intake and there was only traces of oil, really not alot. what do you think...

rotorforce

How bad is the blue smoke? Does it only flow out at higher rpm's, or is it when you let off the gas?

Modded TII's usually puff blue smoke when you bring the RPM's up because of the larger amount of oil being injected into the rotor housing. As the throttle opens, so doesn't the oil metering pump. But it shouldn't be that much.

I would be interested in hearing others suggestions and possible remedies...

rfc_13

Thanks for the input. Its been graduly getting worse over the last 5 weeks or so. Its whenever i let off of the accelerator.

About a week ago i put it to redline in 2nd gear then to about 4000 in 3rd and as soon as i let off, i couldnt see out my back window. It puffs blue whenever the car is boosted.

Even why i am accelerating without the boost gauge moving but i can here the whistle of the turbo then change im still getting the puff.
It is worse at higher RMP's and the harder i push the car.

I am driving it real slow right now because im still unsure about what exactly it is.

rotorforce

It sounds like it's not really a turbo issue? You may already know this but, Rx7's have oil injectors which inject oil into the rotor housing to prevent friction between the moving parts. The faster the RPM's go the larger the amount of oil gets injected.

If I am not mistaken this is common with the aftermarket exhaust and FCD mods. I mean is the smoke an embarresing amount?

My car smokes when I let off the gas.

rfc_13

Yeah its alot, i used close to 2 liters of oil well under 1000km, probably closer to 500km.

rotorforce

If the turbo doesn't have a large amount of oil on the intake side then it might be a different problem alltogether? The only reason I say this is because I have alot of blowby in my turbo because I run at a higher PSI than stock, I mean to the effect that it drips out of the AFM into the air filter, but I never add more than a Qt a month even when it was my daily driver.

rfc_13

Yup thats what im starting to think, ive been having problems with my turbo before i noticed oil burning too. It would start boosting then the boost gauge would start to flutter, it would hesitate and drop, then pik up again, i could, or can when it happens feel the power loss..then gain. But this whole oil burning issue ive got no idea at all now, if it probably isnt the turbo.

GUITARJUNKIE28

no, fire it up in the morning for about 30 seconds, then pull off the exhaust to see if there's oil in there. sounds like the rear turbine seal died. don't worry, they're like $5

rfc_13

is that possibly why im losing boost sometimes aswell??

GUITARJUNKIE28

it can account for slow spoolup, but not a sudden drop off.

rfc_13

hmm, ok, well i will check the exhaust in the morning and see if its filled with oil. One thing i did notice was that there is noticible rings around my exhaust tips caused by oil, its fairly recent, i try to keep my car clean as possible in the winter.

rfc_13

Any more thoughts on this problem? Really needing help on this one.

TeamITR

From what i Read i looks like it might be your turbo. Now when you checked the intake side of the turbo did you check for shaft play? (up and down side to side)
and how long has it been since you rebuild your turbo? Also when you take off fast enough for the turbo to spool those smoke come out of the exhaust?
If you do have shaft play,and its been a while since you have done a rebuild and smoke does come out when you floor it then it's your turbo.

If so let me know and I can give you a good price for a rebuild and if you haven't done so u might even want to upgrade to a hybrid.

rfc_13

I check for any shaft play but there was none. The somke only happens when i let off of the gas pedal, and its blue smoke out the exhaust. I dont think the turbo has ever been rebuilt.

Pinfield357

i think your turbo needs rebuilt sounds like the seals are shot just like mine where

rfc_13

Yeah i think so too, but there was not as much oil in the intake as in your picture. i did have a small amount. Is there usually oil there or should there be none at all, there was also thin layer of oil on the pipes of the inter cooler when i too it off.

roro82

That's sounds about right. You're burning oil in the rear turbine. The more you push it, the more oil gets pushed to your turbo. The reason you don't see much is because it gone.

rfc_13

Ok, so is it as simple as pulling of the turbo and replacing the rear turbine seal? Thank for all the help by way!!

buttsjim

GUITARJUNKIE28 -- Do you have a source for those seals? I can find the rebuild kit, but haven't been able to find individual parts. I checked the Mazda parts fiche, but didn't see them there, either.

Thanks!