smithyithy Posted December 15, 2013 Share Posted December 15, 2013 As above, are they always required are do some turbo setups eg. TD04/5 not actually require them? Just wondering, as if I fit an FMIC kit I'll also need an aftermarket BOV if they are essential.. Quote Link to post Share on other sites
daniel_g Posted December 15, 2013 Share Posted December 15, 2013 They are not essential, however, they do serve a purpose. You will probably find that whatever FMIC kit you buy will have a port in the piping for a DV.Its personal preference whether to run a DV or not, i like the sound of my HKS, but some DVs (baileys) are prone to leaking boost which is never a good thing. Quote Link to post Share on other sites
mikey4410 Posted December 15, 2013 Share Posted December 15, 2013 Dont like these myself.prefer chatter anywho Quote Link to post Share on other sites
ste91 Posted December 15, 2013 Share Posted December 15, 2013 Dont like these myself.prefer chatter anywho Nice avatar lol Quote Link to post Share on other sites
mikey4410 Posted December 15, 2013 Share Posted December 15, 2013 Lol.its not on the car and all the better for it.It got sold ages ago, but yea should change the picture.ha Quote Link to post Share on other sites
Jim* Posted December 15, 2013 Share Posted December 15, 2013 Nice avatar lol crying at this lol Quote Link to post Share on other sites
The Toffinator Posted December 16, 2013 Share Posted December 16, 2013 (edited) Worth running one IMO chatter is nice but on bigger turbos the lag is noticeable on gear changes when you dont have one fitted. However a good adjustable DV is perfect as you get chatter at low boost and no shit noise, and dump at high revs when needed.A bit of positive pressure on shut throttle is actually goid for response but difficult to achieve! Edited December 16, 2013 by The Toffinator Quote Link to post Share on other sites
daniel_g Posted December 16, 2013 Share Posted December 16, 2013 Worth running one IMO chatter is nice but on bigger turbos the lag is noticeable on gear changes when you dont have one fitted. However a good adjustable DV is perfect as you get chatter at low boost and no shit noise, and dump at high revs when needed.A bit of positive pressure on shut throttle is actually goid for response but difficult to achieve!My pal ran no DV on his VF28 and then put it back on, he said there was a noticeable difference in spool time, it was better and less lag. Quote Link to post Share on other sites
smithyithy Posted December 16, 2013 Author Share Posted December 16, 2013 Would it be possible to have the high boost 'dump' recirculate rather than dump to atmosphere? I like the chatter, but don't really want the 'WOOSH' on high boost... Quote Link to post Share on other sites
The Toffinator Posted December 16, 2013 Share Posted December 16, 2013 My pal ran no DV on his VF28 and then put it back on, he said there was a noticeable difference in spool time, it was better and less lag. Possibly mate. But as i said i ran back to back on both the TF035 And my VF24 And could notice it both times. Possibly if your very quick with gearchanges it may be less noticeable but normal fast driving it was mega noticeable. Properly slows the turbo down and is well documented. BUT as i said a small amount of charged air in the system does help. Hence why i now have my R2D2 Set up to only dump very quickly and when flat out. Try it yourself dan ;) And im not sure unless you set up some sort of system it may be possible, possibly using a forge Split r or whatever they are called Quote Link to post Share on other sites
daniel_g Posted December 16, 2013 Share Posted December 16, 2013 Unless i'm getting mixed up and he ment the other way about lol.Yeah man i'll defo be trying it out in mine when its done Ive only got a crappy HKS rep but it didnt leak in the GT so that was a bonus lol.I do prefer that idea of only dumping at high boost thats why i mentioned it up there ^^^ How do you rate the Sard DV then Toff ? Quote Link to post Share on other sites
The Toffinator Posted December 16, 2013 Share Posted December 16, 2013 Hahaha easily confused mabye! And i also have a hks rep and cant fault it really just wanted a proper adjustable one so got the Sard.Really impressed with it makes an awesome sound and at low revs/boost is pretty quiet but when pushing on a bit its louder but a different noise, then full boost is awesome sounds fantastic and keeps the turbo on song! Deffo recconend one Quote Link to post Share on other sites
smithyithy Posted December 16, 2013 Author Share Posted December 16, 2013 Possibly mate. But as i said i ran back to back on both the TF035 And my VF24 And could notice it both times. Possibly if your very quick with gearchanges it may be less noticeable but normal fast driving it was mega noticeable. Properly slows the turbo down and is well documented. BUT as i said a small amount of charged air in the system does help. Hence why i now have my R2D2 Set up to only dump very quickly and when flat out. Try it yourself dan ;) And im not sure unless you set up some sort of system it may be possible, possibly using a forge Split r or whatever they are called So would this just be a case of running a stiff spring setup? Quote Link to post Share on other sites
The Toffinator Posted December 16, 2013 Share Posted December 16, 2013 No mate they are adjustable on the top of some DVs, preloads the spring i think to tighten them up Quote Link to post Share on other sites
littlegreenmonster Posted December 17, 2013 Share Posted December 17, 2013 what about if you run an external wastegate ?? And if you don't have one could you use a bov instead or will I need a wastegate ?? Quote Link to post Share on other sites
daniel_g Posted December 17, 2013 Share Posted December 17, 2013 what about if you run an external wastegate ?? And if you don't have one could you use a bov instead or will I need a wastegate ??This is where Topgear has confused everyone lol, they are different things. Quote Link to post Share on other sites
littlegreenmonster Posted December 17, 2013 Share Posted December 17, 2013 I didnt see it on top gear lop it just crossed my mind that surely a blow off valve would still open if it had a 0.5 bar spring in it to let pressure escape but then again I thought you could monitor it through an external wastegate Quote Link to post Share on other sites
Zeldoz Posted December 17, 2013 Share Posted December 17, 2013 I'm running a Zisco TD04 kit externally gated. 0.7spring. I had a baileys DV on my CT9 but having got rid of the long route pipe work, I had no place to fit it. So basically no DV currently I don't THINK it's laggy... But I've never had a DV fitted an I don't think I particularly want one as I'm enjoying chatter. I do plan on mapping mine at 1bar without one so were see how that goes... Quote Link to post Share on other sites
ste91 Posted December 17, 2013 Share Posted December 17, 2013 (edited) what about if you run an external wastegate ?? And if you don't have one could you use a bov instead or will I need a wastegate ?? BOV and wastegate are not related, the BOV is on the inlet side, wastegate is exhaust side. A wastegate (whether it is internal or external doesn't matter) is what controls your boost, it opens to let excess exhaust gases bypass the turbine wheel once you have reached full boost (this will either be down to your boost controller, or the wastegate spring itself if you don't have a boost controller). A blow off valve releases pressure from the inlet side, when you lift off the throttle the turbo will still be spinning but because the throttle is shut the air can't go into the engine, the only way it can go is back the way it came - through the turbo. It isn't good for the turbo, so the blow off valve releases the excess air. Edited December 17, 2013 by ste91 Quote Link to post Share on other sites
daniel_g Posted December 17, 2013 Share Posted December 17, 2013 Send an email to Topgear with that piece of info ^^^ haha, i'm sure i'm not the only one whos noticed they have mixed up wastegates and DVs before lol. Quote Link to post Share on other sites
Chops Posted December 18, 2013 Share Posted December 18, 2013 i use the original recirculating bov and get chatter from compressor stall, ive always reckoned it was because it's too pussy to depressurise the whole intake fast enough, but im not certian. kind of a safer middle ground to not running one at all if it is. Quote Link to post Share on other sites
AdamB Posted December 18, 2013 Share Posted December 18, 2013 BOV and wastegate are not related, the BOV is on the inlet side, wastegate is exhaust side. A wastegate (whether it is internal or external doesn't matter) is what controls your boost, it opens to let excess exhaust gases bypass the turbine wheel once you have reached full boost (this will either be down to your boost controller, or the wastegate spring itself if you don't have a boost controller). A blow off valve releases pressure from the inlet side, when you lift off the throttle the turbo will still be spinning but because the throttle is shut the air can't go into the engine, the only way it can go is back the way it came - through the turbo. It isn't good for the turbo, so the blow off valve releases the excess air.Technically they are the same and you can use a BOV as a means of controlling boost pressure, look back a few years to the frenzy turbo era of rally engines and you will find they used a BOV to control boost pressure on the compressor side of the turbo. Quote Link to post Share on other sites
ste91 Posted December 18, 2013 Share Posted December 18, 2013 (edited) Technically they are the same and you can use a BOV as a means of controlling boost pressure, look back a few years to the frenzy turbo era of rally engines and you will find they used a BOV to control boost pressure on the compressor side of the turbo. Sounds like a poor way of controlling boost to me, letting the turbo spin much faster than it would if it was controlled by a wastegate, would surely put the turbo out of it's efficiency range and then keeping the BOV open to release air you've essentially just got a massive boost leak... Technically they may be the "same" as they are just valves that allow air through them but in that sense you are just going to confuse people. Edited December 18, 2013 by ste91 Quote Link to post Share on other sites
AdamB Posted December 18, 2013 Share Posted December 18, 2013 Not at all a poor way of controlling boost pressure, there are still many people that use this method because its cheaper, simpler, accurate and responsive. The BOV's are modified with the use of much stiffer springs, some even utilise a twin BOV arrangement. The only downside is that those using air flow meters, may upset the AFR's if routing back into the inlet as the incoming air has already been accounted for. Some people have numerous trophies to back up this system, so it works well enough. But hey thats the world we live in where external wastegates are considered the best thing since sliced bread, when infact it couldn't be further from the truth Quote Link to post Share on other sites
ste91 Posted December 18, 2013 Share Posted December 18, 2013 Are you seriously suggesting that having a massive boost leak is a better way of controlling boost than a proper external wastegate? Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.