kcambron Posted December 25, 2008 Share Posted December 25, 2008 I have a 1981 turbo engine and I'd like to swap a 1975 non EGR manifold for a cleaner look. I have two questions,first, I have a Greddy relief valve with about 1 1/4" threads tapped into the back of my present manifold(81) was this stock or tapped in? My 75 does not have this large hole. Second, I would like to saw off and polish a lot of the (standoffs) on my 75, will I get "into" the manifold if I do this? Thanks! Quote Link to comment Share on other sites More sharing options...
Challenger Posted December 25, 2008 Share Posted December 25, 2008 I have shaved and smoothed several manifolds, 2 n42's. They are pretty simple to shave. You can grind down the linkage towers, almost all the bosses. I believe there are only a few that will actually go through the manifold. The 2 at the rear, one on the bottom, and one in the center between the runners. There might be a few more, I'd check. As for the relief valve, Id consider a BOV so you dont need to drill a hole in the manifold. Quote Link to comment Share on other sites More sharing options...
kcambron Posted December 31, 2008 Author Share Posted December 31, 2008 My car, currently not running,was purchased with a Greddy relief valve on the manifold, I want to swap to a N42 (older EFI manifold) will I still need the relief valve(on the maniold) since I'm running a BOV? Quote Link to comment Share on other sites More sharing options...
nismopick Posted December 31, 2008 Share Posted December 31, 2008 The emergency relief valve & blow off valve serve two diff purposes: Relief valve opens when stock boost levels rise above ~8psi (preventing over-boosting) if the wastegate fails. Technically you don't need it if you trust that your wastegate will always work. BOV releases excess boost pressure once the TB snaps closed. So... no, you don't "need" the relief valve, and yes you should use a bov. Quote Link to comment Share on other sites More sharing options...
kcambron Posted December 31, 2008 Author Share Posted December 31, 2008 Thanks! Quote Link to comment Share on other sites More sharing options...
tyler031734 Posted October 30, 2009 Share Posted October 30, 2009 put that pressure relive valve on your ic piping.... when ever it see's over 8psi it vents... sweet!!! I wonder if this works.. I spent the $50 for the ebay BOV so I guess ill never know Quote Link to comment Share on other sites More sharing options...
Challenger Posted October 30, 2009 Share Posted October 30, 2009 If you just mount it up to the IC piping youll have some fuel issues. Your venting metered air to the atmosphere. Id to some research here, its been talked about alot and the problems associated with it. Quote Link to comment Share on other sites More sharing options...
tyler031734 Posted October 30, 2009 Share Posted October 30, 2009 yeah I should have put something in there that said I was kidding, but i do have a BOV and it is causing some issues between shifts. doing reserch now onj what option to do Quote Link to comment Share on other sites More sharing options...
chipo280z Posted October 30, 2009 Share Posted October 30, 2009 Just to be clear. If i remove the pop off valve and install a BOV on myu intercooler pipping, would my BOV help me in case of a boost spike or my wastegate failing? Should i just re-route the air that the bov vented to the air that goes to the turbo after the AFM? thanks alot Quote Link to comment Share on other sites More sharing options...
Challenger Posted October 30, 2009 Share Posted October 30, 2009 Just use the original valve in runner four, it works fine. Quote Link to comment Share on other sites More sharing options...
tyler031734 Posted October 31, 2009 Share Posted October 31, 2009 no a BOV will not help with a boost spike but running stockish mods Im not worried about it or have had any problems, take the air vented from the BOV and route it after the afm but before the turbo Quote Link to comment Share on other sites More sharing options...
luvmy280zxt Posted December 26, 2009 Share Posted December 26, 2009 Well I've read a few of the posts about venting my bov back inbetween the afm and turbo. Espically how TonyD and Challenger explained it. I have a cheep e-bay bov as a trial one before I decide which type of bov I want to install. There are 3 openenings on it. 2 small ones. 1 which is fwd of the bov and the other at the aft of it. Then there is of course the large opening. With there being 3 openings on it, which one do i need to route down between the afm and turbo. Ive been running it with the bov venting to atmosphere and have been have issues with it stalling on me. So I removed the bov and capped it off. Car runs better but im afraid to go over 9 or 10 psi with out the bov or the pov. Mean while Ill keep searching for a pic of how the bov is routed. Quote Link to comment Share on other sites More sharing options...
luvmy280zxt Posted December 26, 2009 Share Posted December 26, 2009 Sorry bud, didnt realize i just thread jacked you. Mods if your not too pissed off, plz rethread this for me or delete it and ill rethread. Again my bad. 2:20 in the morning here...... 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.