hello i own a 2004 evo 8 and i am new to the import seen so i need some info on a problem that has come up. i have done a few mods like full 3inch exhaust and a bigger incooler hard pipeing and a 50mm Bov nothing eles to the engine. so here is my problem when i take off and my car goes under boost and reaches oh say 35000 rpms is acts like it mis fire and has a jerk in it i had a friend pull codes and it said it was overboosting now can some one plz tell me how and what would cause this and how to fix it this is so much of a pain in my ***. thanks alot.

 

boost controller and a tune

 

+1 on the boost controller and tune. what bov do you have?

 

can i use a manal boost controller or what? my BOV is a Tial 50mm BOV and what do you mean by a tune new plug wires and what not? like i said i sort to this so plz bare with me.

 

he means having you car tuned, not a tune-up. Get a manual boost controller or an electronic one with overboost protection.

 

ok great so i guess next question would be whats a good boost controler to buy?

 

Hallman Pro Rx with the ceramic ball.
Before anything you will need a tune to remove the fuel cut you are experiencing.
Cold air, dense charge from the fmic and the turbo back 3" exhaust are all contributing your problems. The stock ecu is programmed to allow a specific amount of load (maf reading), then it will cut the fuel and ignition depending on the severity of overboost.

 

if you are looking for a manual boost controller, go with the hallman like the guy above stated, or forge UNOS. Now are you recirculating the BOV or venting it to the atmosphere? cause if you are venting to atmosphere, its going to cause all sorts of problems.

 

cool ill look into both of those controllers. my BOV is venting to atmosphere and the way it was put i take it thats bad. on the part of getting my car tuned where do i go back to dealership? and tell them whats going on?

 

Step one put your stock BOV back in.
Step two buy a Hallman boost controller
Step three send your ecu to this guy www.dynoflash.com

Also here is a link to the "how too" section of this forum. It will tell you where your ECU is and how to take it out. Also how to install your new Hallman boost controller. These are both very easy to do. https://www.evolutionm.net/forums/evo-how-tos-installations-82/

 

great thanks to all that posted to this you all where a big help just one more thing i need to clear up and that is why is it so bad to vent to atmosphere with BOVs. cause reson why i am my stock one broke and a friend let me have the one im useing. is there something i can do to keep venting to atmosphere or buy a stock BOV and go back to it? thanks again to all.

 

Because our cars use a MAF to read the air that is coming into the engine and when your BOV throws that air back into the atmosphere the ECU still thinks that air is going into the engine and adds fuel for it. So the results are when your BOV vents that air out is more fuel which will make you run rich inbetween shifts which will slow you down and at it will make your car idle bad.

 

You should buy one of these if you want to replace your BOV http://www.lancershop.com/customer/p...&cat=27&page=1

And why I am at it I buy all my stuff from www.lancershop.com they are great here is a link he the MBC you should buy. http://www.lancershop.com/customer/p...2&cat=4&page=1

 

get rid of that blow off valve you dont need ,they run tial on upgraded turbo's,and i defnitly would try to get in touch with sean ivey for tuning.