Car Tuned But Blows Black Smoke When Put Foot Down

[skyline_seven]

got my rb25 tuned and highflowed, but since then it blows black smoke when i put my foot into it, and when i just let it sit there and idle it blows a little blue smoke when i take off. any ideas?

[wolverine]

Can you go into more detail on the tune including what ecu, age of engine and how it has been treated to date?

[black bnr32]

you are burning oil

your tuner probably busted a ringland or your turbo highflow guy probably screwed up and oil is getting from the turbo to the exhaust

[Jayden.K]

sounds like oil from your turbo due to the high flow, or if your motor is on its way out it probably has excessive blow by. i would check your turbo first

[MrStabby]

Black smoke = rich tune, Blue/white smoke = oil burning. What AFR it is running at WOT?

[rob82]

  On 17/04/2013 at 9:36 AM, MrStabby said:

Black smoke = rich tune, Blue/white smoke = oil burning. What AFR it is running at WOT?

Not always - you often will see black smoke during detonation...

[MrStabby]

  On 17/04/2013 at 10:41 AM, rob82 said:

Not always - you often will see black smoke during detonation...

If you're getting black smoke from det. would you be able to hear it?

[rob82]

  On 18/04/2013 at 10:14 AM, MrStabby said:

If you're getting black smoke from det. would you be able to hear it?

Sorry to be so vague but generally if you can see puffs of black smoke you could be experiencing fairly heavy knock - so if you've got a good set of ears you may pick it up.

I believe what you are seeing is raw hydrocarbons(un/semi burnt fuel) exiting the chamber - which sounds weird as you've just thermally and physically shocked the chamber which you would think would give you a really good burn however most detonation occurs at the outer edges of the chamber where you may have a localized explosion rather than a progressive flame propagation from the spark plug... This may also be the reason that EGT's drop during det...

[JordansR32]

Isnt like a little bit of black smoke normal when your at high rpm/put your foot down? Obviously not to much.

[GTSBoy]

Not "normal". Common, yes. But not normal.

If your mixtures are around 12:1 at full load then there shouldn't be a noticable black stain following you around. Things start getting black when you have low 11s down into the 10s. Any factory ECU car running extra boost is a good example.

  On 24/04/2013 at 11:07 AM, JordansR32 said:

Isnt like a little bit of black smoke normal when your at high rpm/put your foot down? Obviously not to much.

[89CAL]

I still get black smoke with 18psi and 11.5:1ish AFR's at full load.

Go back and get some dyno sheets (assuming it was done on a dyno) it should be saved and they can bring up high speed air fuel ratio.

[Dobz]

Just need to put it on the dyno to check out afr's. As for the white smoke, does it only puff out for a few seconds when you take off after idling and/or when you start your engine up cold?

[greensa14]

Could be a few things bro.

If it is your turbo seals there are a few tell tale signs to look out for.

Check the intake of the turbo compressor for oil. Also when you are coming up to a set of lights rolling to a stop does it smoke a little?

Random smoke at times when sitting stationary at idle?