robin Posted April 19, 2011 Share Posted April 19, 2011 I have removed my bov to try and test it as I suspect it maybe a bit leaky and the hoses are rock solid and I feel need replacing. Blowing through the bov I was able to push a small amount of air through in one direction so I think its likley to be shot. Does anyone know what ID the two larger bov hoses are? Do I even need a BOV? If not what is the best way to block the holes? Quote Link to comment Share on other sites More sharing options...
mellonman Posted April 20, 2011 Share Posted April 20, 2011 you dont need a bov, this is for noise suprestion Mr T didnt want his cars going round making strage noises, there are many threads about this, you decide. any woo i blanked mine off by getting some piping the lengh between the bov conections and then clamping a stopper in the pipe bit of a bodge but works and looks better than when i had end caps on the piping. Quote Link to comment Share on other sites More sharing options...
monsween Posted April 20, 2011 Share Posted April 20, 2011 The pipes are 19-20mm Quote Link to comment Share on other sites More sharing options...
Ric Posted April 20, 2011 Share Posted April 20, 2011 (edited) A car without a Bov will be prone to compressor stall, which is bad. I know a lot of threads say you can run without bov's and it's fine, but mostly these threads are talking about track cars and prepped cars which are regulary changed/rebuilt I personally wouldn't want compressor stall all the time on an ageing 16year old ceramic turbo. Edited April 20, 2011 by Ric morning spelling problems (see edit history) Quote Link to comment Share on other sites More sharing options...
robin Posted April 25, 2011 Author Share Posted April 25, 2011 Thanks for the info, I purchased some marine grade 19mm ID rubber hose which fits perfectly. After reading through the workshop manual and re-testing the bov I think it is working OK and I have refitted it. As the new hoses were straight bits its now mounted sideways as I couldnt really get it to sit in the original orientation without kinking the hoses. I have also been going round replacing every bit of vacuume hose I can but the car is still only making about 0.5 bar on the first turbo and 0.6 on the second. It pulls well, no smoke and there is a definate exhause note change as the 2nd turbo comes on so I think the sequential system is working OK. It will also make positive boost from 2k rpm on even very light thottle so I think the turbos themselves must be at least reasonably healthy (Or am I deluding myself?) My next port of call is to check the intercooler and its hoses. I seem to remeber reading a post where somone used a big inner tube to test the intercooler but I cant find it, can anyone remeber what it was? Quote Link to comment Share on other sites More sharing options...
Lude Posted April 25, 2011 Share Posted April 25, 2011 got a link for the parts you used to block off the pipes? i currently have a wheel nut & walking stick rubber on mine, would like something more correct looking Quote Link to comment Share on other sites More sharing options...
a98pmalcolm Posted April 25, 2011 Share Posted April 25, 2011 Best have on one there so the unused boost has somewere to go other than the turbo. You may get some extemely cool sounds as the unused boost has only one place to go and thats back through the turbo but its really not good and your tubos wont last as long as they should ESPECIALY if your running more boost than stock. My mate did it on his 200SX before we and the turbo went in weeks.. Quote Link to comment Share on other sites More sharing options...
scotty71 Posted April 25, 2011 Share Posted April 25, 2011 got a link for the parts you used to block off the pipes? i currently have a wheel nut & walking stick rubber on mine, would like something more correct looking I have seen a 2 pence used as well on here Quote Link to comment Share on other sites More sharing options...
Lude Posted April 25, 2011 Share Posted April 25, 2011 Best have on one there so the unused boost has somewere to go other than the turbo. You may get some extemely cool sounds as the unused boost has only one place to go and thats back through the turbo but its really not good and your tubos wont last as long as they should ESPECIALY if your running more boost than stock. My mate did it on his 200SX before we and the turbo went in weeks.. really? i know theres a million debates on here, but think there was 1 sientific one which said that 1bar bosst can damage the blades, i know this is opening a can of worms so i dont wish to participate in this thread any longer Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 25, 2011 Share Posted April 25, 2011 Is there anyone that actually stocks bungs to cap the unused pipes? I also use NHS Crutch rubber and some duck tape on mine, Was only meant to be a temp fix till I got something that looked a little less intrusive. Rob Quote Link to comment Share on other sites More sharing options...
robin Posted April 25, 2011 Author Share Posted April 25, 2011 There are a number of bungs avaliable online and on ebay. https://www.tyagiracing.com/products/BOV-Bung-Plug-19mm.html?setCurrencyId=4 http://cgi.ebay.co.uk/CNC-ALLOY-HOSE-BLANKING-BUNG-PLUG-BOV-DUMP-VALVE-19mm-/270577734459?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3effb0933b However I have refitted the original dump valve. I ran the car for a day with two champagne corks as makeshift bungs to see if the car boosted any better and I can honestly say I noticed no change at all in the sound, boost level or anything. So I am now turning my attention to other areas, eg intercooler unless anyone else has any ideas as to why im boosting a little low? (0.5 on 1st and 0.6 on 2nd) Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 25, 2011 Share Posted April 25, 2011 Cheers Robin, I guess I'm just too lazy to look for myself. You have given me inspiration to get this sorted though I think you are looking in the right place for your problem, mine was a faulty bov. It does sound like a leak somewhere. I've just taken off my smic to search for an errant piece of airfilter and my smic almost fell apart. It has several small leaks, the bars had corroded away from the end tanks. At least smic or fmic's are cheap Good luck Rob Quote Link to comment Share on other sites More sharing options...
robin Posted April 25, 2011 Author Share Posted April 25, 2011 I bought a spare 2nd hand SMIC which is in good condition from somone who was fitting a big FMIC. However I have never got round to fitted it. Taking off the bumper looks like such a chore on the supra. Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 25, 2011 Share Posted April 25, 2011 I bought a spare 2nd hand SMIC which is in good condition from somone who was fitting a big FMIC. However I have never got round to fitted it. Taking off the bumper looks like such a chore on the supra. I was dreading that as well. Took mine out in no time earlier. Remove airbox, and headlight, this allows you to get to all of the intercooler fixings except 2 bolts and the jubilee clips. Remove the shroud from under the wing approx 10 bolts. then you get to the 2 bolts and the jubilee clips. All of this can be done without even jacking the car up. I was amazed at how easy it was. I did however have to jack the car up to get enough clearance to pull the ic out Quote Link to comment Share on other sites More sharing options...
robin Posted April 26, 2011 Author Share Posted April 26, 2011 Really, so you got the intercooler off and back on without removing the bumper? Quote Link to comment Share on other sites More sharing options...
DaveR Posted April 26, 2011 Share Posted April 26, 2011 Taking the front bumper off isn't that much of a chore. It's ony a few bolts / clips really. Can easily be done start to finish (headlights, wheel arch liners, bumper) in an hour even while drinking a brew! Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 26, 2011 Share Posted April 26, 2011 Yeah, Well not back on, but if it came off it will go back on, or it would if I hadn't just bought a fmic and now need to remove the bumper. You need a 10mm socket,12mm socket and an extension And just to add that nothing needs bending, flexing or breaking to get it off. Would be easier with the front wheel off but not impossible with it left on. Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 26, 2011 Share Posted April 26, 2011 Taking the front bumper off isn't that much of a chore. It's ony a few bolts / clips really. Can easily be done start to finish (headlights, wheel arch liners, bumper) in an hour even while drinking a brew! To be fair, the wings and bonnet can be removed in less than 15 minutes, but they don't need to come off either Quote Link to comment Share on other sites More sharing options...
robin Posted April 26, 2011 Author Share Posted April 26, 2011 I have the UK headlight washers and the bolts are so corroded I cant undo them so I can see me having to remove all the hoses as well. I have removed other bumpers before without even thinking, but theres just something about the supras, plastic clips, covers and radiators everywhere. Quote Link to comment Share on other sites More sharing options...
Lude Posted April 26, 2011 Share Posted April 26, 2011 There are a number of bungs avaliable online and on ebay. https://www.tyagiracing.com/products/BOV-Bung-Plug-19mm.html?setCurrencyId=4 http://cgi.ebay.co.uk/CNC-ALLOY-HOSE-BLANKING-BUNG-PLUG-BOV-DUMP-VALVE-19mm-/270577734459?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3effb0933b do you remove the rubber pipes with the stock BOV connect to when fitting these? - so they connect to the metal take offs of the IC piping? or do the bungs go into the rubber pipes? Quote Link to comment Share on other sites More sharing options...
Robzki Posted April 26, 2011 Share Posted April 26, 2011 do you remove the rubber pipes with the stock BOV connect to when fitting these? - so they connect to the metal take offs of the IC piping? or do the bungs go into the rubber pipes? Into the rubber pipes afaik Quote Link to comment Share on other sites More sharing options...
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.
Note: Your post will require moderator approval before it will be visible.