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Message: <blockquote data-quote="ryclef331" data-source="post: 401319" data-attributes="member: 8067"><p>I go 3/4 turn on my lash. some can get away with a full. I used to do a full turn but the last time I did the car ran fine on motor but when I went to spray it, it backfired and blew the airfilter clean off the car. I checked everything on the nitrous system but nothing was wrong. Called compucar and they said do the valve lash again. Come to find out, it was holding one or more valves slightly open. Not enough to notice on motor but enough to ignite the nitrous in the intake. However, I don't think that is the case with your car. The problems you describe though are typical though for our cars. However, I am not sure why you'd run bigger injectors and maf AND an FMU. What fuel pressure regulator are you running? If you have one that is capable of boost referencing, then you shouldn't need one. Boost referencing meaning that for every 1 lb of boost the car makes, the fuel pressure should go up 1 lb as well. You sound like a smart guy so I won't go in to much into how that works. I can if you need me to though. Running a boost referenced FPR should negate any need for an FMU. I've got a pretty gnarly cam in my car but I've never checked the vaccum signal strength at idle. However, after my last dyno tune session, I have almost zero issues with idle (slight surge when its cold but it settles down once its warmed up).</p></blockquote><p></p>