300zxRB26 Posted March 7, 2006 Share Posted March 7, 2006 ok so i have my manual mbc hooked up and wen i punch at like 2700 rpm it spikes to about 10 psi then back to 5 psi what can i do about this? Quote Link to comment Share on other sites More sharing options...
Zlovemachine Posted March 7, 2006 Share Posted March 7, 2006 Yes the same thing is happening to my car ( it jiters back and forth really fast from 5 to 10 psi but when i disconnect MBC a solid 5 psi is what i get ) we need some help guys! I am using the biggest nipple on the stock manifold i am tee it with a blow off valve. can that be a problem? Or can it be cheap MBC (Manual Boost Controllers) Quote Link to comment Share on other sites More sharing options...
mtcookson Posted March 7, 2006 Share Posted March 7, 2006 that's strange... the only thing i could possibly think of would be maybe that the hoses are too long causing a delay... but even then i had decently long hoses on mine and i never noticed any spiking. what type of mbc are you using and what type of wastegate? Quote Link to comment Share on other sites More sharing options...
300zxRB26 Posted March 7, 2006 Author Share Posted March 7, 2006 its a homemade mbc and its a stock internal wastegate on my 1988 300zx Quote Link to comment Share on other sites More sharing options...
Thumper Posted March 8, 2006 Share Posted March 8, 2006 Did you drill a small hole in the wastegate side of the mbc? Also is the ball and spring inside the mbc binding? Those are the two things I would check first. Quote Link to comment Share on other sites More sharing options...
Clifton Posted March 8, 2006 Share Posted March 8, 2006 Did you drill a small hole in the wastegate side of the mbc? This is what I did on my 88'. Holds fine at 12 psi. Without the small hole it would spike to 12 and drop off. Quote Link to comment Share on other sites More sharing options...
300zxRB26 Posted March 8, 2006 Author Share Posted March 8, 2006 when u say drill give me ideas on this im knew to this MBC stuff, just some basic info would help Quote Link to comment Share on other sites More sharing options...
mtcookson Posted March 8, 2006 Share Posted March 8, 2006 This site has a bunch of links on the granger valve based boost controller: http://www.fwdmopar.com/sites/dennis/boostcontrolbible.html Quote Link to comment Share on other sites More sharing options...
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