DeLorean

Unfortunately more bad news. Had my car running great, got it inspected, and had both turbos running sequentially. Yesterday on hard acceleration when the secondary turbo came on I got a huge cloud of black/gray smoke coming out the back. The engine does not smoke otherwise, and revving it while stationary does not produce any smoke to redline. Now nearly every time I get into the high RPM and the secondary turbo comes on, I get a few seconds of great smoky clouds out the back. Staying in the first turbo range appears to run clear.

I'm pretty sure I already know the answer here, oil is getting into the compressor side and the turbos will need rebuild. Oil is present in the intake however when I had it inspected I was told it didn't seem excessive.

I'd like to keep the stock twins and have these rebuilt if possible. Since mine is a JDM series 7, is the rebuild the same as the series 6 USDM models? Would love to hear any recommendations on rebuild options, and if it can be rebuilt on the car.

DaveW

Usually oil smoke is blue or light gray. Black smoke is usually a too rich mixture.

JuSanBee

iTrader: (3)

You know about BNR? They rebuild turbos. I bet he would know if he can rebuild them(also fairly good upgrade). I know they changed the compressors a bit to make them more efficient from 6 to 7series fwiw. Getting a pair of 99 spec might be the fastest fix, then send your turbos to get rebuilt. I'd try to get one of those snake camera's or take off the down pipe to converter and see if you got lots of oil in there or if the turbine is black instead of the usual light tan-ish color.

DeLorean

I'm not familiar with BNR. Sounds like it might make more financial sense to buy an entirely new set of 99 spec turbos rather than rebuild?

Also I drove again and would characterize the smoke as more of a light gray. Definitely sends out quite a cloud for a few seconds and then stops. Finding more information searching the forum archives, appreciate all the help.

GrapeSoda

Are you in new zealand? Ive had my twin turbos rebuild ( Series 7 ) and im going single turbo, Can sell them to you if you want? Only been running them for about a year, and only driven once a week.

Redbul

iTrader: (26)

Hello:

if you still have the full sequential set up and if you overfilled the oil, the oil will rise and flow down the hose that runs from the oil filler neck to the front turbo.

But that may be happening only when you get into higher boost.

You mentioned oil in the intake.


This may be the cause.

Often happens to new or infrequent users.

Many owners redivert that hose to a catchcan. If you block it off your engine will stall.

(of course if you divert it you need to cap teh inlet at the front turbo intake elbow.)

Redbul

iTrader: (26)

Have you got all you tests done? Testing the car by running it hard is not likely the best way.
So may guys have blown up their cars on the way home from the docks.

DeLorean

Oil is definitely not overfilled, only about halfway up the dipstick.

Taking the car in again on Wednesday to have them diagnose. I'm stumped and suspecting the worst for the turbos. I assumed the primary turbo would have more wear since it's used more.

Definitely a lot of gray smoke on high RPM and also on overrun/decel from high RPM.