SUPER AFC II--can u vent

[cbellsondsm]

hi i was wondering if you are able to vent with the super afc----basically what would i have to change in the fuel trims to compensate for the air loss.......if possible at all

 

[TSiAWD666]

Sorry to say the afc can't help you in that department

 

[nine5raptor]

The ways to vent:

vpc.

gm maft in blowthrough.

Basically, you have to meter the air after the bov.

 

[92GSXBaltimore]

Originally posted by nine5raptor
The ways to vent:

vpc.

gm maft in blowthrough.

Basically, you have to meter the air after the bov.

....unless you dont car about your engine

 

[kpt4321]

Originally posted by 92GSXBaltimore
....unless you dont car about your engine

It has nothing to do with if you "car" about your engine. Venting will not hurt anything, but it will make the car a pain in the ass to drive (stalling, stumbling, etc) as well as make the car slower.

 

[92GSXBaltimore]

no sir, it will damage your engine by fouling your o2 sensor and therefore making lean conditions more possible.

 

[kpt4321]

Originally posted by 92GSXBaltimore
no sir, it will damage your engine by fouling your o2 sensor and therefore making lean conditions more possible.

This is wrong and wrong.

First of all, it will not foul your O2 sensor. The only time it will cause you to run rich is on a shift. At idle and possibly cruise you will be lean, and at full throttle you will be where you normally would be. The O2 sensor wil not foul.

Second of all, a fouled O2 sensor will read lean, so you will be richer than you should be at idle.

Lastly, the ECU ignores the O2 sensor under boost anyway, so it doesn't matter if it's fouled or not, your A/F ratio will not change.

"Don't give tech advice unless you have first-hand knowledge of the subject. Again, link to the answer and try not to guess the answer to a question. If you are not completely sure about your answer, be sure and state that in your reply. The goal is to not spread hearsay or bad information."

 

[HighPSI TSi Guy]

my BOV is vented and my car runs fine.. oh, and i'm running a 2G MAF w/ SAFC

it's all in the tuning... BUT it's hard to get right.. and most people cant and won't do it.. although i've gotten multiple cars to run SEEMINGLY flawlessly with a vented BOV..

 

[kpt4321]

I bet you money I could make your car sputter, bog, and stall.

 

[HighPSI TSi Guy]

Originally posted by kpt4321
I bet you money I could make your car sputter, bog, and stall.

i can do it it too.. if i forgot to use a clutch :laugh:

i know it's not 100% perfect i never said it was.. but it does drive SEEMINGLY fine... i would bet money i could give you a ride and if you didn't hear the BOV you'd never know it was vented

 

[92GSXBaltimore]

are you ####ing stupid? you just reiterated what i said jackass.

you will eventually foul your o2 sensor by running rich at idle at shift.(if you dont believe me, read what u just said.

you are correct that a fouled o2 sensor will give you a false lean reading, but it will throw your fuel maps off, so get used to buying new spark plugs.

y dont you get off your high horse ****.

p.s. this is an educational forum

 

[1993eclipseGS]

Although there are many threads on this subject already, I believe his question was already answered. So why keep beating the horse If you want to argue, Try doing it in your own topic rather then this guys. All's he asked was a simple question, And recieved a simple answer.

Rob.

 

[kpt4321]

Originally posted by 92GSXBaltimore
blah blah blah something

Since your reading comprehension is obviously lacking, we will work on that first.

Here is what I posted:

"First of all, it will not foul your O2 sensor. The only time it will cause you to run rich is on a shift. At idle and possibly cruise you will be lean, and at full throttle you will be where you normally would be. The O2 sensor will not foul."

Now, in case you're still confused, let me try to clear it up for you. When I say "the O2 sensor will not foul," what I mean is that... THE O2 SENSOR WILL NOT FOUL.

Running rich when you shift under boost isn't nearly enough to foul the O2 sensor. Every time you go WOT, there is 1300*F air ripping through the sensor, I think that might clean it up pretty well.


Ok, next topic. You said:

"therefore making lean conditions more possible."

I told you why that was wrong, and since it was a shorter paragraph, I think you'll be able to figure it out. In case you're still confused, the answer is that a fouled O2 sensor would make the car run richer. The O2 sensor won't be fouled in the first case anyway (see above), but my point is that you're wrong there too.


So, in short: The O2 sensor won't fuel, so none of the bad stuff are are talking about will happen.

Now, you still don't want to vent the BOV. It's a bad idea. Not, however, for the reasons put forth by smartie here.

Yes, it is an educational forum. That's why I'd appreciate it if you stopped talking.

 

[92GSXBaltimore]

i wish you were standing in front of me right now........

please dont question my intelect, you obvious dont know anything about me.

unless you are saying that your car never idles or you never shift gears, the fact is that you are incredibly wrong. Do you have any formal training in automotive technology?.......I do. Have you rebuilt multiple engines before?.....I have.

O2 sensors foul from running rich. <--(you aparently already know that)

O2 sensors foul after time from venting. <--(i guess your too ####ing stupid to realize that)

Finally, if your reading comprehension was sufficient, you would realize that what i said was, "making lean conditions more possible." please get a thesaurus, if you know what that is, and see if you see the word "probable" next to the word "possible".

 

[HighPSI TSi Guy]

the rich result of venting a BOV is not even remotely near the ammount required to foul a O2 sensor.

 

[Tallen]

The only time a car will ahve bad idel is if its a leaky stock BOV. Otherwise it'll jsut be rich between shifts and hurt performance a tad as a side effect.

 

[kpt4321]

Originally posted by 92GSXBaltimore i wish you were standing in front of me right now........

Because you can't resolve this by realizing your information was wrong, and instead you feel the need to hit me? Smart.

please dont question my intelect, you obvious dont know anything about me.

I know that your grammar sucks.

unless you are saying that your car never idles or you never shift gears, the fact is that you are incredibly wrong. Do you have any formal training in automotive technology?.......I do. Have you rebuilt multiple engines before?.....I have.

Nope, I'm not trained in "automotive technology." I'm sure I have training that you do not have, what is your point?

Yes, I've rebuilt motors. Mechanical knowledge has no place in this discussion.

O2 sensors foul from running rich. <--(you aparently already know that)

They can, if you run REALLY rich for a long period of time. However, that's not the case. If you run rich for a fraction of a second every shift, and then you run lean at idle, and you run normally everywhere else, your O2 sensor is not going to foul.

O2 sensors foul after time from venting. <--(i guess your too ####ing stupid to realize that)

Like I said above. The richness that comes from the BOV venting to atmosphere happens only a VERY small percentage of your driving time. The heat of the exhaust under the rest of the conditions of driving will be more than enough to keep the O2 sensor clean.

Do you have any reasons why I would be wrong with the above statement? You keep stating the same thing over and over again, but you have not used any information to back up your "theories." I've shot every one of them down, and I've told these people WHY they aren't true.

Finally, if your reading comprehension was sufficient, you would realize that what i said was, "making lean conditions more possible." please get a thesaurus, if you know what that is, and see if you see the word "probable" next to the word "possible".

A foul O2 sensor won't make the A/F ratio leaner. Not at all. Therefore, it is not probable, possible, likely, feasible, or plausible that venting the BOV to atmosphere will cause the motor to run leaner.

Regardless of what word you used, it WILL NOT happen. That makes you wrong.

 

[kpt4321]

Originally posted by Tallen
The only time a car will ahve bad idel is if its a leaky stock BOV.

The stiffness of the spring in the stock BOV is light enough that the BOV will be open at idle, which causes idling problems when vented to atmosphere.

 

[92GSXBaltimore]

i wasnt talking about resorting to violence, i type all day long so i get lazy and make typos.

please read this.....
if the majority of your driving is highway, then your prob not going to foul your o2 sensor. But if the majority of your driving is stop and go city driving, then yes you will foul your sensor. I dont know where you guys get your information from but my old 92 tsi had only 2.5 exhaust, K&N, mbc(14psi), ported o2 housing, and an act2100. when i ported my o2 housing, the o2 sensor looked good. the same day i ported the o2 housing, i vented my cbv. 20k miles later, my gas mileage started to go down so i checked the sensor and it was shot. I then pulled the plugs and they were burnt white. so that led me to believe that they got that way from the o2 sensor sending a bad signal and screwing the a/f ratio.

that is where i got the info for my argument, take it for what you will.

p.s. for the shitty attitude, I apologize. Its been a rough week for a number of reasons I'de rather not go into on the board.

 

[Cesar]

Venting your blow off valve serves no purpose other the rice effect. The pros do not overcome the cons. Anyone who knows and understands the way the metering system works would see plently of reasons why you should not vent. I would recomend you look into relocating the sensor closer to the throttle body for better response. converting from MAS to MAF for better flow. After these mods are done and you've benefited from them, it is your option to vent filtered air or not.

 

[TurboMeTroy]

I think the BOV is a matter of preference and proper tuning.

My car is fast as #### (for the stupids to comprehend)----
AND vented...w/ the Blitz.



New rings
Valve stem seals
All new gaskets
Revised lifters
Balance Shafts Removed
EGR Removed
Ported Head
Ported/Polished Intake Manifold
Shaved/polished valve cover
Add-ons:
2G TB Elbow
ACT 2600
Apexi S-AFCII
ARP Headstuds
AutoMeter Boost Gauge
Custom FMIC (3 - 1G Intercoolers)
Denso 720cc Injectors
Eibach Sportline Springs
FPR
Fuel Pump Rewire
Joe P. Boost Controller
GAB Front/Rear Struts
Ported 2G Exhaust Manifold
Ported FP Green Turbo
Tial 38mm Wastegate
UR Crank Pulley
Denso FP
NGK Plugs & Wires
Dejon 3" intake
2g MAS
Blitz BOV
Slim condenser fan

thanks,
Troy

 

[kpt4321]

Thanks, I was sitting here all day wondering what your mods were.

 

[Cesar]

Originally posted by TurboMeTroy
I think the BOV is a matter of preference and proper tuning.

My car is fast as #### (for the stupids to comprehend)----
AND vented...w/ the Blitz.



New rings
Valve stem seals
All new gaskets
Revised lifters
Balance Shafts Removed
EGR Removed
Ported Head
Ported/Polished Intake Manifold
Shaved/polished valve cover
Add-ons:
2G TB Elbow
ACT 2600
Apexi S-AFCII
ARP Headstuds
AutoMeter Boost Gauge
Custom FMIC (3 - 1G Intercoolers)
Denso 720cc Injectors
Eibach Sportline Springs
FPR
Fuel Pump Rewire
Joe P. Boost Controller
GAB Front/Rear Struts
Ported 2G Exhaust Manifold
Ported FP Green Turbo
Tial 38mm Wastegate
UR Crank Pulley
Denso FP
NGK Plugs & Wires
Dejon 3" intake
2g MAS
Blitz BOV
Slim condenser fan

thanks,
Troy

It doens't matter how much money you put into your car. Venting has negative side effects. The degree of how negative the effect may be is dependant on who you ask. Vent if you want. I work in a machine shop and I spend countless hours bead blasting carbon deposits from heads and valves.

 

[92TsiTalon]

it does make is more difficult to drive...that much is clear as kpt said. however, baltimore, i dont know where you get this bullcrap that it fouls your O2 sensor. it doesnt. ive run my bov vented for the past 15k miles and a simple inspection of the O2 sensor was enough for me to put your argument to rest. yes, i actually went and checked. and if we want to go with who's got the technical competence....i'll stick with what kpt has to say. i wouldnt let you rebuild my motor if you were the last mechanic on earth (not to mention i'd do it myself anyway).

 

[TurboMeTroy]

No need to be a bi***--->I was just letting you know what I was working with and that it worked fine w/ my set. Save the bickering for the standards of the mindless idiots, that you seem to have lowered yours to, or perhaps not ?



I find it a bit odd, that people run in the 10s, and even 9s when vented to atmosphere...those guys must be pissed it idles rough, huh?
I think that it's just cheaper to pick up a 1g bov....