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Old 27-03-2019, 19:44   #1
SteveSAS
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How much smoke is normal?

Hi guys,
I get a greyish smoke from exhaust when running from cold (fast idle) & then settles down when warm. I have also noticed a slightly darker grey from exhaust (looking in rear mirror) when flooring it sometimes, especially say in top gear on motorway doing 50, then planting throttle so car under load.
Where my tailpipe is near to brick wall I also have a nice black sooty mess left behind. I would say it smells a bit fuely.

Car is evo 8 FQ330, with decat, DW fuel pump, 1000cc injectors, HKS Turbo & mapped to 380bhp/350torque with only 1.5bar boost. Injectors, turbo, fuel pump are only couple years old & was mapped to 423bhp/400torque with 1.7bar back then with previous owner. I chose to get another map and bring boost down for what I wanted.
Had new plugs (not sure which) 10k miles ago costing £52.

Oh, engine has 70k miles with full service history

Any opinions please let me know.

Thanks Steve
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Old 27-03-2019, 20:26   #2
Sephiro
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I've noticed a lot more soot since switching to a decat with a map on my X. Previously my garage floor wouldn't show any when I started the car, but now I get a bunch of splatters on the floor from both tail pipes. Smoke wise I would get some at WOT before the decat and I'd say I get slightly more now, but it's not enough of a difference to concern me (the person sucking it up in the car behind might disagree though ).
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Old 27-03-2019, 22:01   #3
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I'd say don't worry, I had my car tuned and went back to the tuner with exactly the same issue...turned out there was nothing wrong, it was just fuel, I was worried it was turbo seals and all sorts. It was just fuel when flooring it. I'd suggest the greyish smoke on startup is just likely condensation, assuming you're based in the UK I guess the temperature is cool there at the moment?
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Old 28-03-2019, 00:25   #4
Lolo la Torche
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If it smells fuel and smoke is dark grey/black, no worry. If it smells oïl and smoke is grey, something's maybe wrong
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Old 28-03-2019, 11:34   #5
SteveSAS
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Thanks for sharing your experiences guys.
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Old 30-03-2019, 19:58   #6
Pulsarlee
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sounds just like my evo 7 after i had it decatted and mapped, running sts turbo, mr cams, 1.6 bar boost solenoid and kakimoto 3" 340 / 340.
I know that righ is better than weak, but worried as oil smells petroly and also a bit of smoke when i floor it - especially visable if headlights behind me.
Thoughts guys?
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Old 31-03-2019, 08:12   #7
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why are you running 1000 cc injectors ??? with the power you have there slightly over kill ,and its likely just bunging in to much fuel ,swop them back to some standard 560s and get it remapped there should be NO smoke ANYWHERE if its mapped properly
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Old 31-03-2019, 12:07   #8
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I used to get this with a similar spec Evo when it had the RC injectors but once swapped to the Bosch Motorsport 1000cc's black smoke was just a memory
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Old 07-04-2019, 20:06   #9
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hi guys,
if I need the car weakening off a little, does this mean a full re map? I think my tuner is pretty good and provided the torque and bhp graphs as well as the afr. I just feel sure there is a need for a slight adjustment, as it just smells rich even after a long thrash.
ill be speaking with him, but just thought id see what your thoughts are.
mind you, when the engine was rebuilt and mapped, it was 31 degrees when dynod.
Thanks
Lee
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Old 08-04-2019, 06:28   #10
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just get it remapped PROPERLY, black smoke is over fueling which is bad mapping ,properly mapped it will have no smoke and should go better
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Old 08-04-2019, 08:17   #11
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Quote:
Originally Posted by super rover View Post
just get it remapped PROPERLY, black smoke is over fueling which is bad mapping ,properly mapped it will have no smoke and should go better
This.

Also the overly large injectors may have something to do with it. The standard injectors will suffice for that much power.

'Normal' should be no smoke of any colour.
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