russj249 2 Posted January 17, 2011 Report Share Posted January 17, 2011 After sorting out the wastegate, with a 0.5bar spring from a Tial F38... I was wondering about blow off valves.Again there's some cheaper ones and some expensive ones. But what does everyone run? I've had a look through a few build threads but these are slightly overlooked in detail.Any suggestions welcome and video's/sound tests will be even better! (even if it's not a VR6T) Link to post Share on other sites
craggsy 91 Posted January 17, 2011 Report Share Posted January 17, 2011 I have one of these on my R32http://www.forgemotorsport.co.uk/images/products/FMDVSUPR.jpgForge supersize Link to post Share on other sites
russj249 2 Posted January 17, 2011 Author Report Share Posted January 17, 2011 is it re-circ back into non boost side or dump to atmosphere? Link to post Share on other sites
craggsy 91 Posted January 17, 2011 Report Share Posted January 17, 2011 Recirc......no whoosh noises from meAlso ive removed the duplicate thread you put up Link to post Share on other sites
russj249 2 Posted January 17, 2011 Author Report Share Posted January 17, 2011 Sorry mate, didn't know it had put 2 up :S was it the exact same thread??I've had a look on the forge website now, and suppose I don't need one as big as yours, but this twin piston one seems ok and suitable for cars with an air flow meter.http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=0006&product=FMDV004What are your thoughts? Link to post Share on other sites
craggsy 91 Posted January 17, 2011 Report Share Posted January 17, 2011 Im not a big expert on these things, really need Jim or Kev to see this thread to advise you really Link to post Share on other sites
russj249 2 Posted January 17, 2011 Author Report Share Posted January 17, 2011 no problem. I appreciate your help, to be honest I'd never given forge a thought until you mentioned it so opened up a whole new world of shiny bits Link to post Share on other sites
FishWick 21 Posted January 18, 2011 Report Share Posted January 18, 2011 I have one of these on my R32http://www.forgemotorsport.co.uk/images/products/FMDVSUPR.jpgForge supersizeYeah that's a good size valve for V6 turbos if you're using a MAF :-)I've got one of those going spare if a certain person wants to buy it ;-) LOL!Because I don't run a MAF, I'm using a Tial 50mm BOV at the moment- http://www.gt3turbo.com/Merchant/product.php?productid=210&cat=350&page=1 which is a very splendid thing indeed! As it flows a huge amount, it gives a much more refined and deeper sound than what you get from little under-sized valves that psssshhhhht all over the place. It also only vents when it needs to aswell and I get absolutely zero compressor surge (that cha cha cha woofing noise some people love so much).In a nut shell, fit the biggest valve your wallet and application will allow ;-) Link to post Share on other sites
russj249 2 Posted January 18, 2011 Author Report Share Posted January 18, 2011 so how many notes do you want for the supersize then kev?the reason i asked about that other one was because i wasn't sure if 25mm would be quick enough to release the pressured air quickly.i'd want the supersize to vent to atmosphere so will it need anything on outlet side or just leave it as it is?can you buy silicone t pieces to fit these then, the only t pieces i see split to 25mm Link to post Share on other sites
FishWick 21 Posted January 18, 2011 Report Share Posted January 18, 2011 Was thinking £50 with some 50mm ally tube and silicon bits thrown in? It's only sitting there unused, so if you can put it to good use :-)The 25mm one you linked to is a bit small for a VRT and if you're going with OE management, you can't vent to atmosphere anyway, you would need to vent all the waste boost back into the intake (post MAF, pre turbo).Well, you can dump to the air but your fuelling will go way too rich on gearchanges and coming back onto the throttle.... you'll have the fume police breathing down your neck!If you're going standalone, you can run a BOV to atmosphere. Link to post Share on other sites
legvw 0 Posted January 18, 2011 Report Share Posted January 18, 2011 I've got a tial 50mm bov an i agree with Kev! Link to post Share on other sites
russj249 2 Posted January 18, 2011 Author Report Share Posted January 18, 2011 I'll have that off you then kev. can't do it just yet because i'm on my phone but if you can send me your paypal address i'll sort it later for you. i'll send money as gift.as for the routing i was going to run standard ecu for a while. so if i have to i'll run it that way.can running rich when coming off the throttle damage anything or just dump fuel through the exhaust? i know it might sound saft but could it help cool the exhaust valves or wouldn't it make a difference? Link to post Share on other sites
legvw 0 Posted January 18, 2011 Report Share Posted January 18, 2011 You'll get some flames out the back! Link to post Share on other sites
russj249 2 Posted January 18, 2011 Author Report Share Posted January 18, 2011 well it does that on gear change anyway loli thought it was a problem with something but maf and everythin's all new and no fault codes!although saying that i do get a mixture adaptation fault come up now and again. Link to post Share on other sites
Mick_F 0 Posted January 18, 2011 Report Share Posted January 18, 2011 I use an NGR Type S on one of my cars and its sounds sweet, basically its a copy of the greddy type s but not a cheap copy and it sounds sweet and doesn't leak unlike the greddy. Link to post Share on other sites
FishWick 21 Posted January 19, 2011 Report Share Posted January 19, 2011 I'll have that off you then kev. can't do it just yet because i'm on my phone but if you can send me your paypal address i'll sort it later for you. i'll send money as gift.as for the routing i was going to run standard ecu for a while. so if i have to i'll run it that way.can running rich when coming off the throttle damage anything or just dump fuel through the exhaust? i know it might sound saft but could it help cool the exhaust valves or wouldn't it make a difference?No worries chap....My first turbo engine was a bog standard lump with spacer, BEGI fuel riser and uprated pump. Totally standard management and injectors etc. On that engine I ran a BOV and on gear changes, the AFR dropped to 9:1 with a nice cloud of black smoke out the back. You don't get flames from fuel THAT rich. What you get is bore wash, which dilutes the oil down and can accelerate bore wear. Petrol engines make best power between 12 - 13.5:1. Anything richer than 10:1 is borderline bore wash. Try and keep your fueling around 14 on cruise and 12 in boost.On standalones you can adjust the gearchange fuelling (known as "Tip out") and really back it off, but there is always a momentary delay in injectors closing and the Lambda responding, so sometimes it's only an 'apparent' richness. But if you're going for a chip tune this will be sorted for you, but you MUST recirc the waste boost mate :-)Using excess fuel to cool the valves is an excuse I see the American tuners who favour over-rich boost fuelling use all the time. Put bluntly, if the motor is built to handle the EGTS it's likely to see, then you don't need to run silly boost fuelling lower than 12:1 Link to post Share on other sites
russj249 2 Posted January 19, 2011 Author Report Share Posted January 19, 2011 Ok kev cheers for the info.. i will recirculate the air back through then. should be easy enough for me to plumb in. you have pm by the way. Link to post Share on other sites
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