Black smoke, tune?

[mmm240]

I'm looking at a car with a 2nd gen RB25det installed. The seller says that it smokes black because it needs to be tuned. The motor has only FMIC, exhaust, and 50mm Tial BOV. Doesn't make any sense to me why it would smoke because it isn't tuned. Does it make any sense to you?

[Joe]

when does it smoke black?

if its all the time, it runs pig rich and something is wrong (sensor, etc)

if its when he lets off the gas, its because of the BOV.

[BoostFab]

I'm looking at a car with a 2nd gen RB25det installed. The seller says that it smokes black because it needs to be tuned. The motor has only FMIC, exhaust, and 50mm Tial BOV. Doesn't make any sense to me why it would smoke because it isn't tuned. Does it make any sense to you?

black smoke = rich; white smoke = oil /or coolant

[mmm240]

I didn't think it would have anything to do with needing a tune. He said it needed a power f/c to fix the problem. Altleast it's not a big deal. I'll have to think it over.Thanks

[BoostFab]

I didn't think it would have anything to do with needing a tune. He said it needed a power f/c to fix the problem. Altleast it's not a big deal. I'll have to think it over.Thanks

putting in a FPR will lean it out.

you need to make sure the smoking, like kamin said, all the time or only on shifting gears.

otherwise it's not a big of a deal.

[craz4240]

Running rich for sure.......what kind of fuel pump does it have?

[Joe]

when does it smoke black?

if its all the time, it runs pig rich and something is wrong (sensor, etc)

if its when he lets off the gas, its because of the BOV.

[mmm240]

He didn't say about a fuel pump. I just sent him an e-mail asking when it smokes. Maybe he's just selling it because he doesn't feel like figuring out the problem and or shelling out close to 2gs for an EMS

[Cameron]

is he Venting the BOV into the ATmosphere on a draw through (Factory) maf setup? that could cause problems.

[craz4240]

I think there needs to be more specifics..however it doesn't sound major...atmosperic bov,no fpr,vacum leak,bad sensor etc. like said above.

[Shocker]

remove the 50mm, block off the hole for it, reinstall stock bypass valve with recirc hose to intake inlet, I have the standard inlet if you need to buy one.

[gawdzilla]

my tune has been really really bad at points, and i've hardly ever seen black smoke. If it's like diesel truck black smoke all the time I'd be a bit concerned about the health of the motor. If its in small amounts between shifts or only noticeable on heavy load, i'd say its the tune

[Carl H]

proly a dead ecu in limp mode.

[mmm240]

when does it smoke black?

if its all the time, it runs pig rich and something is wrong (sensor, etc)

if its when he lets off the gas, its because of the BOV.

He got back to me about it today. He says only when he lets off the gas. So what type of problem with the BOV would that be?

[craz4240]

The BOV needs to be recirculated to the intake system.

[Cameron]

werd. problem hopefully solved.

[mmm240]

Here's a pic. Looks like it is circulated to the intake. I would prefer it be on the cold pipe, but oh well. I'm just getting started with turbos, so maybe I'm missing something? [IMG] http://img.photobucket.com/alb...8.jpg [/IMG]

I guess i'm new to this function too. Click to see pic.
Modified by mmm240 at 8:30 PM 2/15/2008

[Cameron]

oh so its got a tial. can they be recirced? if it is, its facing down and i cant see it.

[craz4240]

Well basically by the looks of it...you either need to run a blowthrough MAFS,or get a better BOV that can be recirced.However I suggest option #2,and if you do run atmopheric you can run an HKS SSQV BOV,I have mine open air and it never has caused any black smoke.

[Joe]

Here's a pic. Looks like it is circulated to the intake. I would prefer it be on the cold pipe, but oh well. I'm just getting started with turbos, so maybe I'm missing something? [IMG] http://img.photobucket.com/alb...8.jpg [/IMG]

I guess i'm new to this function too. Click to see pic.

Modified by mmm240 at 8:30 PM 2/15/2008

its not recirculated. that small vacuum line is to help the BOV open when you close the throttle.

thats the cause of the smoke. you cant run an open BOV on a RB without a blowthrough maf, or a standalone. i would recommend just putting a stock BOV on. they work fine.

[mmm240]

Thanks everyone!

[Cameron]

if you dont have the stock bypass valve, i got one. throw me a price.

[mmm240]

I don't own the car, I'm still thinking about buying it.

[Cameron]

oh well even if you do buy it i have one for ya, if you decide to change to stock. cause like Kamin said in a thread before, theres really no point for an obnoxiously loud BOV on a stock motor. and the tial is pretty damn loud.

[craz4240]

I love the f&f soundtrack I have on my car...