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Black Smoke?

RBert
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RBert Enthusiast

RBert

Posted
Posted

short story.

r32 gts

stock rb20

no cat

dad watched me drive away from the house the other day and when i got home he said there was some black smoke

coming from the exhaust (didnt say how much, but he was like.."you been reving the guts out of it? and i was like umm no more than usual. i usually drive pretty casually reving to no more than 4k..with the occasional 1 gear limiter to 2nd.

anywho he told me to get a compression test and check the oil so on.

basically before i go get a mechanic to tell me theres something wrong for the sake of it.

could the black smoke just be because i have no catalytic converter?

the car seems to be driving fine, as of late i think either the spark plugs or the coil pack needs to be changed as every now and then as i have some boost hesitation.

any help much appreciated

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Spurdo Experienced

Spurdo

Posted
Posted

yeah a little black smoke quite often doesnt mean much at all. unless it really was spewing it out with vigour i wouldn't worry about it. keep in mind the car is ~20 yrs old so its no spring chicken and sometimes it will show its age in more ways than one.

when the smoke is blue thats when you should start getting concerned.

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StevenCJR31 Veteran

StevenCJR31

Posted
Posted

short story.

r32 gts

stock rb20

no cat

dad watched me drive away from the house the other day and when i got home he said there was some black smoke

coming from the exhaust (didnt say how much, but he was like.."you been reving the guts out of it? and i was like umm no more than usual. i usually drive pretty casually reving to no more than 4k..with the occasional 1 gear limiter to 2nd.

anywho he told me to get a compression test and check the oil so on.

basically before i go get a mechanic to tell me theres something wrong for the sake of it.

could the black smoke just be because i have no catalytic converter?

the car seems to be driving fine, as of late i think either the spark plugs or the coil pack needs to be changed as every now and then as i have some boost hesitation.

any help much appreciated

was the engine cold when you left the driveway? if so the smoke may be due to the engine running rich having been on the ecu cold start program

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RBert Enthusiast

RBert

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yeh it would of been cold been cool in perth last few mornings and no i dont have an atmo bov, its blocked off hehe

cheers for you're help guys, i didnt think it was anything to dramatic and i plan on doing some big engine changes in the near future so should be fixed

when i do that.

thanks once again.

ps: if the engine explodes in the next week or so ill be sure to let you know :P

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StevenCJR31 Veteran

StevenCJR31

Posted
Posted

yeh it would of been cold been cool in perth last few mornings and no i dont have an atmo bov, its blocked off hehe

cheers for you're help guys, i didnt think it was anything to dramatic and i plan on doing some big engine changes in the near future so should be fixed

when i do that.

thanks once again.

ps: if the engine explodes in the next week or so ill be sure to let you know :P

yeah she has been cold lately! ice on the car windscreen on a few mornings

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iplen Mentor

iplen

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Posted

The amount of fuel smoke my stagea used to blow could have powered a Prius.. Gtr is not much better at times either, fuel smoke, esspecially when the engine is cold (ie first 5-10 mins if it is -10 or 40) is not a bad thing. Safer for the engine to be rich than lean.

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Hadouken Grand Master

Hadouken

Posted
Posted

The amount of fuel smoke my stagea used to blow could have powered a Prius.. Gtr is not much better at times either, fuel smoke, esspecially when the engine is cold (ie first 5-10 mins if it is -10 or 40) is not a bad thing. Safer for the engine to be rich than lean.

Damn straight! Id rather have my car be puff the magic dragon thab lean out!

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*LOACH* Veteran

*LOACH*

Posted
Posted (edited)

Damn straight! Id rather have my car be puff the magic dragon thab lean out!

True, but also keep in mind that a rich running engine will have less power and will use more fuel than if it has a correct A/F ratio.

Edited by *LOACH*
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gotRICE? Veteran

gotRICE?

Posted
Posted
. Safer for the engine to be rich than lean.

Depends on just how rich though.

I had mine detonate to buggery when the O2 sensor on the dyno was faulty. Was reading almost 2AFR out. Detonation when running rich looks scary from the exhaust end.

Figured this out when we maxxed out 555cc Nismo injectors on an RB25 running 17psi with a GT30. lol.

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