Alright, so I'm running a 4-port Defined NA Circuit Spec Streetport, NA tune exhaust port, S4 NA rotors, turbo intake manifolds and TB, S4 high imp. 550cc injectors, S4 high imp. turbo engine harness, S4 NA Ecu and S4 turbo AFM. All other internals for the motor are turbo parts, ie; oil pump, oil metering pump, etc. I know that I could stand to gain some power by going with a Haltech or even a Megasquirt, but I'm just not there yet. So please see if you can help me as is. The car has been completely built by me, motor, everything.

The issue I am running into is that the car is puffing blue smoke out the tail pipe once the car is warmed up. There is a heavy smell of fuel, not oil burning, and I'm not going through oil any faster or anything of the sort. The factory engine wiring is only modified with an extension of AFM wiring.

Thanks for any help or ideas. I'm keeping this in the NA-Forum, if I go anywhere else, they'll spout blasphemy for taking the turbo off.

Thanks guys and girls.

-J

 

I think its a mis-match between the S4 ECU and the S4 Turbo AFM. If I recall correctly, there is a difference in the signal generated by the AFM that will cause the car to run very rich. I have it in my factory manuals somewhere if you need the information exactly. Also, I don't know if the S4 ECU can compensate for the 550 injectors. I believe that the stock injectors are 440's, so the signal from the ecu is dumping 11% more fuel per pulse than it should.

Just a couple of things I would look in to. I am certain that somebody else will have more exact information at their fingertips.

Eric

 

Same N326/7, no difference in AFM between boosted and non boosted.

 

n326 NA AFM is 0-5V across 600 cubic metres per hour

n318 turbo AFM is 0-5V across 720 cubic metres per hour

the turbo injector is 550 cc
the NA injector is 460 cc

that should spell it out for you

 

Thanks for the detail. Its generally what I remembered, but I didn't have the specifics. The car should run very rich with this setup in an NA car.

Eric

 

So the turbo AFM is better for getting more air in on the nonturbo setup, my issue is simply in my injectors? Or both?

I feel stupid for asking these questions, but perhaps I'm just missing it.

Thanks for the help guys.

 

NA Ecu + Turbo Injectors = Too much fuel.

Just get a turbo ecu to run turbo sensors and parts.

 

And if the turbo ECU makes the car run worse?

 

Also, do you think that the over fueling is causing the blue smoke? I know blue smoke is oil, but it smells heavily of gas and is thick blue smoke.

 

Turbo ECU with Turbo Injectors and Turbo AFM, call me crazy, but I think it'll work. The turbo ecu is mapped for operating under vacuum, but I don't know how it compares to an NA map.

Sounds like a mixture of both types of smoke. Try leaving your oil filler cap loose or off and see if you are pressurizing your crankcase. Maybe too much premix. Otherwise, I'd suspect the oil seals.

 

I'll try the turbo ECU again, see if maybe the first time out, it was running bad because it was still barely breaking in.

Also, the oil seals are all brand new, and were installed correctly. I'm thinking the problem is that my exhaust is the same one I used when I was turbo'd and the turbo had some leaking oil seals, so I think I'm just burning off previously dumped oil. It only smokes when the car is warmed up, so it makes sense.

Back to the ECU, if I am running the turbo ECU and it will read and run in vacuum, why am I seeing positive pressure on a NA setup?

 

I like that explanation of the oil smoke a lot better than the oil control rings. :thumbsup:

You would be a hero to this entire forum if you can make boost without a turbo! Unfortunately, your gauge cluster is reading wrong because you are running a turbo (N318) pressure sensor with an NA ecu. Should be fine with the turbo ecu.

 

Plugged in the turbo ECU, still hitting boost!

Runs better, though. Thanks guys.