Just hoping to get some ideas on this before I start messing about too much.

My car has a Rotrex charged F20c, RC750s, Haltech ECU, test pipe and it runs mostly between 11.7-12.2 AFR when under full throttle in all gears. I had originally been having lots of smoke and oil burning issues but I took the head off and had the valve guides replaced, valves refaced and seats recut, new Honda gasket, stem seals, ARPs etc. Since then the oil burning and consumption has reduced greatly but I still leave a cloud of smoke under full throttle.

I can't tell what colour the smoke is because it is hard to see in the mirror and the gopro doesn't capture it very well, however it does look black/dark. It doesn't do it on startup, or deceleration and it doesn't smell like burning oil like it used to so I am starting to think it must be fuel but how can it smoke like that under full throttle and maintain such good AFRs.

Ignition is stock dropping down to 19degrees at 14psi, my charger only boosts to 10-11psi max.

I've just bought a new set of one step colder plugs as recommended by guys on here in case I'm getting poor spark and incomplete combustion (yet to fit), I've also just added a vent to atmosphere catch can which uses both the cam cover vent points (I've done 60 miles or so with it in place now and the only thing that was in it was a little condensation, no oil or oil vapour although it does smell strongly of fuel).

Any ideas gratefully recieved.

 

Post up a video if you can.

FYI at vtec transition everyone with a SC I know smokes out a puff. Just because it runs slightly lean at the vtec transistion I believe. Also the AEM doesn't have dual tables (I would think Haltech does). But just thought

 

Mine does it, I always thought it was oil, then again I am hardly burning any even at 150K miles so, I think it might be just fuel in my case.

Then again I do know AP1s burnt oil where as far as I know my AP2 never did.

 

I'll try and get a decent video of it at the weekend, I'll have to play about with camera positioning to get a shot that shows how bad it really is.

I might play about with the VTEC crossover point to see if that has any effect on it but it isn't just restricted to crossover it is constant all the way until you lift off the throttle, also I have a good AFR at crossover (probably due to the dual tables).

I'm at 117k, recent top end rebuild and when inspected the bores looked great and were true. Might be worth doing a compression check though to rule that one out. My money is still on fuel (probably because I don't want to be sticking a new set of rings on it).

 

I always had a darker smoke under WOT on my SC'd AP1. My tune was set to run steady 12 AFR. I don't know if it had anything to do with ignition settings or what. This happened when I was ~12 PSI and when I was ~16 PSI.

 

Also, I had a VTA catch can coming off my PCV and crankcase vent just like yours. After a few autocrosses it would have a decent amount collected in it and it would drain out in layers... layer of water (condensation), layer of oil, layer of gas, layer of foamy yellowish stuff. Strong smell of gas as well.

 

I get a random puff when changing gear after a hard rev up towards the limiter every so often, wasnt sure if it was normal on s'charged cars

 

I'm turbo's and every once in a while I will get a puff of dark smoke with gear changes at or near redline. I always figured it was a bit normal, because I can't think of a single turbo'd car that i've driven behind that didn't let out a puff at some point. I think that may have to do with using a TP, but I don't know for sure.

 

I also had a TP installed.

 

My 04 supercharged car likes to have the oil changed when the puffs of smoke start happening @wot.

Maybe somebody can comment on the possibility that a catch can would stop this from happening, and cleaning out the intercooler.