my LNF build thread
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^^ With a draw through maf, I 100% agree. With a maf relocate however I do not. Recirc will benefit nothing at that point and will just add unnecessary clutter under the hood. For a straight up track car, sure there are clear benefits, but for 99.8% of stock turbo cars who would like to THINK they're building a race car, it's really minimally beneficial.
Let's face it though, the vast majority of folks who want a vta bov are basing they're decision to do so purely off of sound and not between shift performance aspects. For those, a recirc pretty well defeats the purpose of spending the money on a bov setup in the first place. In those situations, a maf relocate and block off plate are plenty appropriate without a recirc.
Let's face it though, the vast majority of folks who want a vta bov are basing they're decision to do so purely off of sound and not between shift performance aspects. For those, a recirc pretty well defeats the purpose of spending the money on a bov setup in the first place. In those situations, a maf relocate and block off plate are plenty appropriate without a recirc.
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^^ With a draw through maf, I 100% agree. With a maf relocate however I do not. Recirc will benefit nothing at that point and will just add unnecessary clutter under the hood. For a straight up track car, sure there are clear benefits, but for 99.8% of stock turbo cars who would like to THINK they're building a race car, it's really minimally beneficial.
Let's face it though, the vast majority of folks who want a vta bov are basing they're decision to do so purely off of sound and not between shift performance aspects. For those, a recirc pretty well defeats the purpose of spending the money on a bov setup in the first place. In those situations, a maf relocate and block off plate are plenty appropriate without a recirc.
Let's face it though, the vast majority of folks who want a vta bov are basing they're decision to do so purely off of sound and not between shift performance aspects. For those, a recirc pretty well defeats the purpose of spending the money on a bov setup in the first place. In those situations, a maf relocate and block off plate are plenty appropriate without a recirc.
haha 
it will be recirculating because i have heard the sound the synapse makes while recirculating and it seemed pretty loud and gave a good sound. and since i am 100% doing this for the sound thats all that matters to me. i did not order a maf relocate, i will be doing this recirculating but only because if the youtube is realistic it sounds pretty damn good either way just a lot louder not recirculating. so ill start of with it recirc. if i want it louder then ill relocate the maf and unhook the hoses and have that option. thats why i went with the synapse. 
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The DV unit sounds great vta on my car, so you shouldn't disappointed. It's a very fast "clean" and crisp vent sound. No squeaks, chirps or oscillations. I personally can't stand those types bov's. They sound like cheap children's toys to me. I'm not quite sure how it will sound recirc, but I'm sure it will still sound just as good, just quieter.
How did you plan on orienting yours? Push or pull?
How did you plan on orienting yours? Push or pull?
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From: riverside
The DV unit sounds great vta on my car, so you shouldn't disappointed. It's a very fast "clean" and crisp vent sound. No squeaks, chirps or oscillations. I personally can't stand those types bov's. They sound like cheap children's toys to me. I'm not quite sure how it will sound recirc, but I'm sure it will still sound just as good, just quieter.
How did you plan on orienting yours? Push or pull?
How did you plan on orienting yours? Push or pull?
you should send me a video of your VTA DV i havnt heard one on the cobalt yet
Last edited by cblt2469; Jan 10, 2015 at 02:26 PM.
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just about to place an order with altered ego automotive design for this on the fuse box cover, and have a coil plate cover made in the same color scheme that says "COBALT SS"
Last edited by cblt2469; Jan 14, 2015 at 10:16 PM.
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so i forgot to order the 3.3bar map sensors. so i placed that order today. so everything is ordered. just waiting for it to ship out, and all that good stuff. then gotta wait to install it all. 
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i dont know i was actually going to ask you what you thought? i figured id play with it and see what i liked, and what performed better. also where should i recirculate it to? like where at in the intake?
you should send me a video of your VTA DV i havnt heard one on the cobalt yet
you should send me a video of your VTA DV i havnt heard one on the cobalt yet
Also be sure to NOT use the vacuum line going to the bpv off of the bpv solenoid to feed the bov. The bov must have a good unrestricted vac/boost manifold source. Otherwise it will not work or respond correctly.
As far as getting a vid of the sound. That might be pretty tough for me this time of the year. My car pretty much stays garaged the entire winter unless there's an exceptionally good day and the roads are clean. If the rain that's coming tomorrow or Tuesday melts all the snow in my driveway maybe I'll take it out a little later this week and make a quick vid for you. Although my guess is that it will likely just ice over considering how cold it's been here lately. Which ultimately means more salt being spread on the roads, so no promises unfortunately.
^^This
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I messed around with different configurations and vacuum port setups and found, for my setup, the best combo was in the pull configuration using both the A/B ports. It gave me the fastest response and most audible sound. With a recirc setup you'll likely have to mess around with it a bit to make sure the valve and the engine are working together correctly, and not fighting one another.
Also be sure to NOT use the vacuum line going to the bpv off of the bpv solenoid to feed the bov. The bov must have a good unrestricted vac/boost manifold source. Otherwise it will not work or respond correctly.
As far as getting a vid of the sound. That might be pretty tough for me this time of the year. My car pretty much stays garaged the entire winter unless there's an exceptionally good day and the roads are clean. If the rain that's coming tomorrow or Tuesday melts all the snow in my driveway maybe I'll take it out a little later this week and make a quick vid for you. Although my guess is that it will likely just ice over considering how cold it's been here lately. Which ultimately means more salt being spread on the roads, so no promises unfortunately.
^^This
Also be sure to NOT use the vacuum line going to the bpv off of the bpv solenoid to feed the bov. The bov must have a good unrestricted vac/boost manifold source. Otherwise it will not work or respond correctly.
As far as getting a vid of the sound. That might be pretty tough for me this time of the year. My car pretty much stays garaged the entire winter unless there's an exceptionally good day and the roads are clean. If the rain that's coming tomorrow or Tuesday melts all the snow in my driveway maybe I'll take it out a little later this week and make a quick vid for you. Although my guess is that it will likely just ice over considering how cold it's been here lately. Which ultimately means more salt being spread on the roads, so no promises unfortunately.
^^This
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so get this weekend off of training. and i get to go home. if my parts are in im gonna try and install them. still wondering where i should route the recirculation for the BOV? should i just go to the same place as the stock BPV? thanks
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Since you're running a block off plate on your k04, you can pretty much entirely do away with the bpv solenoid and bypass the vacuum tank as well. Then just have your tuner remove any potential DTC's that might come up from removing these components. That will then free up the vacuum port on the manifold to run direct to the bov. Run your single line up to about 8" away the valve and then install a "Y" fitting. From there you can now utilize both the A & B ports (similar to the vacuum port setup with that synapse valve in the picture, however that valve has an optional C port as well I believe). Using both these ports will give you a much faster response from the valve.
With your synapse dv, I would definitely do a similar setup to the above with your recirc as well (I think that's DartSi's setup if I remember correctly). I personally went a little further away from the turbo with the placement of mine, but I'm also running vta and didn't need to worry about doing a recirc hose.
With your synapse dv, I would definitely do a similar setup to the above with your recirc as well (I think that's DartSi's setup if I remember correctly). I personally went a little further away from the turbo with the placement of mine, but I'm also running vta and didn't need to worry about doing a recirc hose.
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Since you're running a block off plate on your k04, you can pretty much entirely do away with the bpv solenoid and bypass the vacuum tank as well. Then just have your tuner remove any potential DTC's that might come up from removing these components. That will then free up the vacuum port on the manifold to run direct to the bov. Run your single line up to about 8" away the valve and then install a "Y" fitting. From there you can now utilize both the A & B ports (similar to the vacuum port setup with that synapse valve in the picture, however that valve has an optional C port as well I believe). Using both these ports will give you a much faster response from the valve.
With your synapse dv, I would definitely do a similar setup to the above with your recirc as well (I think that's DartSi's setup if I remember correctly). I personally went a little further away from the turbo with the placement of mine, but I'm also running vta and didn't need to worry about doing a recirc hose.
With your synapse dv, I would definitely do a similar setup to the above with your recirc as well (I think that's DartSi's setup if I remember correctly). I personally went a little further away from the turbo with the placement of mine, but I'm also running vta and didn't need to worry about doing a recirc hose.
okay so thats my engine bay. the guy already took the hoses there and did the vacuum box delete thing that people do. so that black hose coming off the manifold can i just tap into that black hose and tee it off and have that go to where its going now and to the DV? and then a few inches from the DV just tee it off again and run both A&B ports? im not sure what you mean by get rid of that completely? or am i talking about something completely different? sorry i dont have the car in front of me so im trying to see how to hook it up the best i can by pictures i find online or by pictures my brother sends me when i ask him for them. haha thanks for the help i truly appreciate the patience ya'll have shown with me..
Last edited by cblt2469; Jan 21, 2015 at 12:33 AM.
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also i have been doing a little bit of reading on BOV placement. as i didnt know it mattered until you guys mentioned it. so from what i gathered is kinda like what you guys were saying. closer to the TB and it will improve throttle response, and cause less air to travel backwards towards the turbo trying to get out of the BOV. which causes the turbo to slow down (acting almost like a brake.) and closer to the turbo relieves pressure from the turbo immediately causing less turbo speed loss because the air gets vented immediately. someone did mention that the closer to the turbo it is the hotter the air is. 250-300* and that he has seen BOV fail with the high temps. idk how true this is. and im still not sure which route i wanna take so i think ill just put smack dab in the middle and say **** it :P HAHA.... no but seriously what do you guys think and do you have any data on both positions? whether its facts or just something you felt. etc etc. thanks
As I said before put it as close to the turbo as possible.
You have the zzp around the motor pipe so it will look the best and perform the best and have the least amount of plumbing if you put it right on the straight part that runs parallel to the valve cover.
You have the zzp around the motor pipe so it will look the best and perform the best and have the least amount of plumbing if you put it right on the straight part that runs parallel to the valve cover.
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I appreciate the input. I'm just curious if anyone has any data as to why that is the better place to put it.
And as for me having the zzp around the motor pipe? I'm confused on what you mean? Nothing on the car is zzp. I had pretty much planned on putting it in the same spot as the picture with the bov already installed. As he has the same charge piping as me. And all that.
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Just picked up my pipes from my buddy. He tag welded my bungs on for my DV. Headed home to install. Will tune it on Monday. Block off plate gets here Monday or So. Just gonna pull the vacuum lines from the stock bpv. And that should keep it closed till I get the block off plate in. Will poat pics when it's done.
at what horsepower level are these stock fmic good for? ive heard several people say with just a tune they blew the caps off of the stock IC. i may only be planning for 300 but i want it reliable. and i have future mods that will put me into the 400's so im getting some of that stuff out of the way now. im okay with "over doing" supporting mods. as long as im not under doing anything then im happy. and as for the vented being a waste. in your opinion its a waste, but to me its not. the stock is prone to leaking and not being reliable in the mid 20 psi range, the forge is more reliable, and if im going to replace it with a forge BPV i want the vented one so i get the sound and the reliability with it. i may lose a little spool time but in all honesty these cars make such good torque down low an extra 100-200 rpm out of boost will help with traction. so no the stock isnt broke but its a precautionary measure im taking to make sure it doesnt break 
. i appreciate input as i thought it was a lot harder to hit the 300 mark before i made this thread, but hearing several people say ill be hitting 300 easily that makes me happy, and theres never enough horsepower so if with my setup i hit 320 then fuckit i hit 320. im not gonna complain over to much horsepower lol.
. i appreciate input as i thought it was a lot harder to hit the 300 mark before i made this thread, but hearing several people say ill be hitting 300 easily that makes me happy, and theres never enough horsepower so if with my setup i hit 320 then fuckit i hit 320. im not gonna complain over to much horsepower lol.
i would have those welds redone...... looks like you will have some boost leaks. not trying to knock his skill but pressurized pipe welds need to be spot on.
and i thought you had the zzp style piping for some reason that went around the motor not over it.
and i thought you had the zzp style piping for some reason that went around the motor not over it.
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The welds don't look that we'll because when I took it to him I had left some oil on the pipes not realizing that affected welding. They are air tight. They look sloppy but i promise they aren't. He's a great welder. These just look shitty. But i will definitely keep an eye out on them. I got the dv installed. Just gotta figure out how to send the pic here as my uploads are full. It seems to run great. Not much flutter expect when it builds like 1-2 psi then just a little bit.