With mods below, and all the intercooler hoses 100% tight and secure, I have boost set at 1.5 bar, it holds the boost in 1st, but drops in 2nd, 3rd, and 4th. But holds on the dot at 1.5 bar in 5th and 6th. My boost controller is connected 100% correct, could it be something in the ECU since I am running stock ECU at the moment. (Apexi not in the car yet).....

 

Any one, knows the technical explination ?

 

any one cammon guys ? Your not going to get an 'F' for a wrong answer !

 

? Any one ? HELP I just reset the ECU and no luck ?

 

How much of a drop are you talking about ?

 

did you disconnect the factory boost cont

 

what bc you using? and holding in first is hard to beleive IMO i can hold 21psi in all gears but first due to engine load
ecu has not much to do with it other than the fact that it controlls the solenoid valve wich is disconnected from the wastegate and becomes basically useless

 

yes I did

Hallman BC

1st 1.5
2nd 1.3
3rd 1.3
4th 1.3
5th 1.5
6th 1.5

 

my best guess try another b/c i use hks evc 22psi from 2800 rpm to 7300. just a suggestion if you buy another one

 

I have to agree, that sounds like the BC is dropping a few lbs... its hard to get the exact same boost in all gears anyway.. of course normally your boost gets a bit higher in 3rd-4th-5th and is usually a little lower in 1st-2nd because of engine load.

Of course you have a MR, and I am not familiar with its "normal" behavior... I would imagine the same principles apply...

I

 

its from the stock internal wastegate. thats why the stock evo hits 19psi and tapers to 16psi. If you want to hold steady at a certain psi, you have to set it slightly higher.

 

I might try a different MBC to see if it is it ! I already tried different BOV's

I can't set it any higher it will hit over 1.55 then ! in 6th ! Any that is a NO NO