Whoo- Hooo BOV installed....

[Yeagy]

I know, I know - our cars are not ment to run a BOV (TurboXS RFL "Really F'n Loud")but I bought the part before I got the car, and before researching a replacement DV. I also have a 710N at the house so I can switch it out as soon as the BOV gives me a problem. Install took like 30-45 mins. I went into it blind, not know how to do ANYTHING. I had to guess which pipe went to the air-box and so forth. I got all the parts where I thought the needed to be and started up the car. Gave it some gas, like up to 3K rpm and "whoooosh", OMG! I didnt think it would be that loud.Took it for a test drive around the block and noticed the sound as low as 23-2500rpm. A full boost release makes a sound easily heard for 2-3 blocks. Almost annoying because it is soooo loud. I will give up dates on CEL's and so forth. Non-yet ,knock on wood.
If you guys want pics I can email them to somebody who wants to host them for me.
Thanks
Brian

[DDQ]

Yes, please post pics of your car running rich.

I think some guys have run BOVs without CELs, but that doesn't really mean it's not hurting performance, not to mention gas mileage.

Can you make a sound clip? I'd like to hear what it sounds like.

[littlewhite]

High or low pitch ? THe forge i have is like high and sounds like it is sneezing

[A Foore]

Yes, a sound clip would be nice :)
Hmmm? Does anyone know what can be done to have the car run with a BOV properly?

[marked001]

recirc back into the system....but then no sound..

[D Piddy]

Originally posted by ImportRacer
Yes, a sound clip would be nice :)
Hmmm? Does anyone know what can be done to have the car run with a BOV properly?

u just have to reroute the air from the BOV outlet to the airbox. so it's possible to attach a hose from where the air exits the BOV and run it to the airbox. i dunno, i personally don't think it's worth it, but ot each their own. i wouldn't want my car to be heard from blocks around, the only distance i care aout is the few feet b/w me and the other car as a blast by them

[voltronb5]

Originally posted by blackknight
High or low pitch ? THe forge i have is like high and sounds like it is sneezing

you know i notice that during low RPM my forge gives off a low-"WHEEWW" type noise... and when i punch it and switch fast, it PINGS.. kind of like an HKS BOV.... is that normal??

[OverSpun]

rice, rice, baby....

[MR VTEC]

totally!

[D Piddy]

Originally posted by OverSpun
rice, rice, baby....

i didn't wanna be the first one to say it

[JMG]

I'd just save your cat and mileage and put the 710N in now.

[EVIL-AUDI]

As long as you like it fine, but in the long run your car won't.

[Korrect414]

Whoo- Hooo Running Rich !

[littlewhite]

Originally posted by voltronb5
you know i notice that during low RPM my forge gives off a low-"WHEEWW" type noise... and when i punch it and switch fast, it PINGS.. kind of like an HKS BOV.... is that normal??

pings? hm... never on mine. but the sound u are saying is right. Like when u r hitting boost and like 1.1 bar, u get a sneezing sound.

[Yeagy]

Im not really sure on how to post pics of my car running rich. Im not really sure what to compare the sound to, it is way more deep then it is high-pitched though....To make it worse, my car is at its stock trucked up ride height, and the chipped ecu wont be here til the 4th, so my car sounds faster than it should when it is still very slow...

[JMG]

Originally posted by Yeagy
Im not really sure on how to post pics of my car running rich. Im not really sure what to compare the sound to, it is way more deep then it is high-pitched though....To make it worse, my car is at its stock trucked up ride height, and the chipped ecu wont be here til the 4th, so my car sounds faster than it should when it is still very slow...

http://www.urbandictionary.com/defin...e&defid=169319


hehehe not to be mean or anything. Get a recirc kit and you shouldn't have any problems running rich.

[Silvant]

funny post..

[EnvyJK]

What about the blowoff that ECS-tuning sells? It says it's made particularly to run on 1.8t engines. I'm guessing they know what they're doing over there

[AudiMan]

rice cook off

[EVIL-AUDI]

Our cars look for that recirculated air that you are venting out. It's just that simple

[Daft]

Exactly. You let the air out but, the injectors still provide the fuel to go with the air.

Later you can replace the O2 sensors and the cat because they've become fouled with carbon deposits.

[RedRocket]

Originally posted by EnvyJK
What about the blowoff that ECS-tuning sells? It says it's made particularly to run on 1.8t engines. I'm guessing they know what they're doing over there

That really bothers me. That's one thing that makes me wonder about those guys.

[Yeagy]

Originally posted by turbo90awd
Exactly. You let the air out but, the injectors still provide the fuel to go with the air.

Later you can replace the O2 sensors and the cat because they've become fouled with carbon deposits.

When did this happen to you?

[DDQ]

Originally posted by RedRocket
That really bothers me. That's one thing that makes me wonder about those guys.

I think just about every tuner sells at least one product that is just there to satisfy their market, even though the product may not add any value or performance.

[JMG]

Originally posted by Yeagy
When did this happen to you?

It's happened to a few people. Chekc this link:

http://forums.audiworld.com/a4gen2/msgs/417318.phtml

[e.van]

You could buy an SAFC and de-tune the fuel injection to make it not run rich. Or buy smaller injectors.

[JMG]

Originally posted by e.van
You could buy an SAFC and de-tune the fuel injection to make it not run rich. Or buy smaller injectors.

or save a few hundred dollars and get a 710N... $30 bucks, works just as well.

[Devious27t]

Originally posted by DDQ
Yes, please post pics of your car running rich.

I think some guys have run BOVs without CELs, but that doesn't really mean it's not hurting performance, not to mention gas mileage.

Can you make a sound clip? I'd like to hear what it sounds like.

a little FYI we were curious to see if this were really true as no one has ever produced data logs to say one way or the other. the test mule was a GFB hybrid which albeit is not a true BOV in the sense but still vents pressure to the atmosphere at WOT. we were using a wideband O2 sensor. the DV we used was the EVO valve a commonly used. the test was 3 multiple gear pulls at WOT. the A/F range for both valves through the rpms was exactly the same for all of the runs with the BOV and DV.... now that our curiosity has been further sparked we will data log with both the vag and the wideband but for now your statement is complete bullshit.

The GFB is now being used on one of the 1.8t challenge cars because it holds more boost and allows for much greater turbo response not to mention the DV does not move enough air and causes his turbo to surge this valve recircs the necessary air and lets the excess out so that his turbo can spool faster without surge.... for those of you who know 2ptzero know that he was the grand high anti dump valve king.... well times change when you have a wide band. continuously variable fuel maps are fun

[DDQ]

Originally posted by DVS18t
a little FYI we were curious to see if this were really true as no one has ever produced data logs to say one way or the other. the test mule was a GFB hybrid which albeit is not a true BOV in the sense but still vents pressure to the atmosphere at WOT. we were using a wideband O2 sensor. the DV we used was the EVO valve a commonly used. the test was 3 multiple gear pulls at WOT. the A/F range for both valves through the rpms was exactly the same for all of the runs with the BOV and DV.... now that our curiosity has been further sparked we will data log with both the vag and the wideband but for now your statement is complete bullshit.

The GFB is now being used on one of the 1.8t challenge cars because it holds more boost and allows for much greater turbo response not to mention the DV does not move enough air and causes his turbo to surge this valve recircs the necessary air and lets the excess out so that his turbo can spool faster without surge.... for those of you who know 2ptzero know that he was the grand high anti dump valve king.... well times change when you have a wide band. continuously variable fuel maps are fun

Not going to get into it.

But, common sense = truth enough. I don't need multiple people to ruin their cars to prove it.

DVS18t ---- I know you're way smarter than that. I'm not sure why this should become a debate over numbers.

[Devious27t]

Originally posted by DDQ
Not going to get into it.

But, common sense = truth enough. I don't need multiple people to ruin their cars to prove it.

DVS18t ---- I know you're way smarter than that. I'm not sure why this should become a debate over numbers.

its simple really... i believed the theory some what myself that if air is unmetered than the fuel map would be shifter that was until i got into a discussion about fuel maps in modern cars with a local tuner, he was explaining to me that BOV's are beneficial for cars that flow too much air to be able to recirculate it efficiently. which is the case for cmh's car, his evo valve did not allow all of the remaining charge pressure to recirculate sending it back into the turbo and causing surge (there is your common sense). with the GFB installed he was allowed to recirc air and dump the remainder allowing his turbo to spool up. the thing that might not make as much sense is what happens after the valve closes. the map at WOT is continuously variable which means that once the valve closes and the turbo begins to spool and load is added the fuel map changes which incorporates the closed loop system and keeps the car from being rich. i will get numbers for this because i find it interesting that people are always quick to jump on the hybrids but have never taken the time to do this kind of testing. i dont know about that mistertam site either because our results were totally different.

there are two things i will say are BOV's necessary on something like a k03 probably not they dont flow shit for air. second i have said nothing about true dump valve like that of the greddy, blitz, apexi or HKS name. only that my findings incorporate a particular valve that is a hybrid.

[JMG]

DVS18t, I'd get a BOV in a second if I had proof that the don't do any harm to my car, but all evidence proves otherwise. People running BOVs either are assuming nothing is wrong, or find out later somethign is wrong. People who find out KNOW, while people who assume don't know jack. So i make a judgment call... what you you do?

Besides, all this anti-BOV talk is to combat the fast and furious epidemic of useless products. BPVs are cheaper, do their job, and don't have issues with our cars. Remember that the majority of the 1.8t drivers don't go bigger than KO4.

[Daft]

Originally posted by e.van
You could buy an SAFC and de-tune the fuel injection to make it not run rich. Or buy smaller injectors.

The SAFC doesn't work that way. You can't specify a reduced airflow count at any random time. You can only reduce airflow throughout the rpm range.

If I reduce airflow from 3-4K rpms, it won't help me if I shift at 5K. Then, if you change the whole airflow table to lower levels everywhere, the car runs too lean the rest of the time.

[Daft]

Originally posted by Yeagy
When did this happen to you?

Seriously, you need to read some books on automotive induction systems or something. This stuff is common sense.

If it really matters, this has been a hot topic for many years now with various OEM turbocharged cars.

There have been plenty of MAF equipped turbo cars long before the A4 1.8T. Companies like HKS have been making parts for turbo charged cars since the early 1970's.

[Yeagy]

Originally posted by turbo90awd
Seriously, you need to read some books on automotive induction systems or something. This stuff is common sense.

If it really matters, this has been a hot topic for many years now with various OEM turbocharged cars.

There have been plenty of MAF equipped turbo cars long before the A4 1.8T. Companies like HKS have been making parts for turbo charged cars since the early 1970's.

Im sorry, I didnt ask about books or anything....back to the question at hand; When did this happen to you?

[Daft]

Personally? Never. I always knew better than to put a blow off valve on a metered air intake engine.

[alen]

why would you want to waste air by using a BOV? for sound? not very smart.

[Devious27t]

Originally posted by JMG
DVS18t, I'd get a BOV in a second if I had proof that the don't do any harm to my car, but all evidence proves otherwise. People running BOVs either are assuming nothing is wrong, or find out later somethign is wrong. People who find out KNOW, while people who assume don't know jack. So i make a judgment call... what you you do?

Besides, all this anti-BOV talk is to combat the fast and furious epidemic of useless products. BPVs are cheaper, do their job, and don't have issues with our cars. Remember that the majority of the 1.8t drivers don't go bigger than KO4.

there is no evidence just many people who dont understand what the real use it. there is only so much air that can be recirculated into an intake you have to remember that everything is done very quickly and the DV is only as good as it is big. on a k03 or k04 this is not a necessity as these things flow shit for air. but when you start to creep into the bigger turbos with higher boost things change. some people dont realize what the DV is doing as they just dont know but they can cause surge. my current setup is causing the ever popular evo valve to surge. i have however watched a wideband with my own eyes and seen that the A/F across the revs does not change as the map adjusts when the system returns to closed loop. when i get a chance to take recorded logs i will as no one has ever produced logs to say otherwise with the hybrid valve. i personally ran the valve on my car for 1 1/2 years and felt that turbo response was better than with my evo (which was put in to pass smog and will come back out.)

[JMG]

Originally posted by DVS18t
there is no evidence just many people who dont understand what the real use it. there is only so much air that can be recirculated into an intake you have to remember that everything is done very quickly and the DV is only as good as it is big. on a k03 or k04 this is not a necessity as these things flow shit for air. but when you start to creep into the bigger turbos with higher boost things change. some people dont realize what the DV is doing as they just dont know but they can cause surge. my current setup is causing the ever popular evo valve to surge. i have however watched a wideband with my own eyes and seen that the A/F across the revs does not change as the map adjusts when the system returns to closed loop. when i get a chance to take recorded logs i will as no one has ever produced logs to say otherwise with the hybrid valve. i personally ran the valve on my car for 1 1/2 years and felt that turbo response was better than with my evo (which was put in to pass smog and will come back out.)

Just to get a straight answer. What about KO3 cars? So you are saying that running a BOV is perfectly okay or not?

[JMG]

Originally posted by DVS18t
there is no evidence just many people who dont understand what the real use it. there is only so much air that can be recirculated into an intake you have to remember that everything is done very quickly and the DV is only as good as it is big. on a k03 or k04 this is not a necessity as these things flow shit for air. but when you start to creep into the bigger turbos with higher boost things change. some people dont realize what the DV is doing as they just dont know but they can cause surge. my current setup is causing the ever popular evo valve to surge. i have however watched a wideband with my own eyes and seen that the A/F across the revs does not change as the map adjusts when the system returns to closed loop. when i get a chance to take recorded logs i will as no one has ever produced logs to say otherwise with the hybrid valve. i personally ran the valve on my car for 1 1/2 years and felt that turbo response was better than with my evo (which was put in to pass smog and will come back out.)

The A/F is dynamic throught the band is it not? You wold have to do a plot graph of the A/F throughout and do a side by side comparison. You are also saying you haven't done this yet, so basiscally we still don't have solid proof. I'm basing my opinion on BOV from the fact that this guy had problems:

http://forums.audiworld.com/a4gen2/msgs/417318.phtml

and that it's a closed turbo system. The air is metered then it is gone... thats running rich. Remember we are talking about KO3s and KO4s here. Thats what Yeagy has.

I'm really interested in your results, but then again it sounds like you have a totally different setup then Yeagy or I or the majority of the people here on AZ.

What kind of boost are you producing? IMHO the EVO is surging because it can't handle that amount of boost. How much boost can the BOV in question hold?

[Devious27t]

Originally posted by JMG
The A/F is dynamic throught the band is it not? You wold have to do a plot graph of the A/F throughout and do a side by side comparison. You are also saying you haven't done this yet, so basiscally we still don't have solid proof. I'm basing my opinion on BOV from the fact that this guy had problems:

http://forums.audiworld.com/a4gen2/msgs/417318.phtml

and that it's a closed turbo system. The air is metered then it is gone... thats running rich. Remember we are talking about KO3s and KO4s here. Thats what Yeagy has.

I'm really interested in your results, but then again it sounds like you have a totally different setup then Yeagy or I or the majority of the people here on AZ.

What kind of boost are you producing? IMHO the EVO is surging because it can't handle that amount of boost. How much boost can the BOV in question hold?

we used a wideband o2 but were in a hurry so didnt take time to save any logs it was just more of an I wonder type deal that had very unexpected results. the car by no means ran rich with the hybrid valve installed. my set up or the one we were using but the fact remains that the ecu we were using in both cases the changes made to the fuel maps react the same in each case no matter the turbo. my car right now is only holding about .7 bar and spiking to 1 bar. i am running low boost because i am still in the process of tuning the car and getting everything in tip op shape. as for that guy on audiworld he had some parts fail that are not uncommon to fail on audis i am not saying that his HKS did cause it but there was no hard evidence there. i am having a hard time fathoming how a blow off valve can cause engine temp sensor failure and he simply thinks that his cat is on the way he has not taken the time to log the post cat o2 sensor temps and post them which is why i am skeptical of his accusations. but i will still say that the BOV is unnecessary for a k03 and a k04 because the DV will recirc all the air that the turbo could flow, i also dont think people should use them for the sound because that is just gay. i urge people if they are skeptical to do what i am goin to do when i get my valve back after the 1.8t challenge and take some logs and post them if they think they run rich dont just say "oh i heard from so and so that the car runs rich and its just common sense" the lack of hard evidence with many things is what hinders the audi community. after all the fastest 1.8t vw's run BOV's and they pull perfect A/F ratios with them.