loss of boost after shifting
#1
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loss of boost after shifting
so i think it could be my boost controller but im not sure i have a hallman mbc im running 19lbs as of now when i pull in any gear weather its 1st 2nd 3rd or 4th when i shift and put it back to wot it will only hold 14psi like its by passing the mbc any ideas could my mbc be bad?
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#9
You may also experience this when you get back-pressure in the exhaust. Can happen when your cat is going bad. The material in the cat can breaks up and in extreme circumstances it can clog the exhaust stopping your turbo from spooling. I had the honeycomb of material actually turn sideways in the exhaust, you can imagine the affect it had on the turbo. More than likely though you just have a boost leak.
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maybe itd help if i did a list of current mods since i just started using the forum anyways as of right now i have a stm intake no maf aem series 1 tail bov unrecirc stm upper intercooler piping buschar racing racing intercooler and lower piping with a fp white rabbit turbo and spooling up cop hallman mbc i think it might be the boost controller going bad to bad no buddy close has one i could hook up
#15
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the OP has an stm intake, he prolly doesnt even have a snorkel. if he does its just to divert air to the filter. how is that going to cut boost?
to build boost u need compressed air in a chambered atmosphere. if he's losing boost its somewhere in the charged air section. the only other area is if his intake is completely closed off resulting in no air induction. i dont see a snorkel doing that.
if the snorkel can really "cut boost" then the evo is horribly made. im sorry to say that, i guess i bought the wrong car.