b4 over boost and cutout problems

[gtlegacy]

ok my mate has a b4 that was auto tipronic with ej206 motor has converted to manual and used all of the manual parts including complete loom under dash etc etc

also has a ej20h bottom end with b4 heads and head gasket to get the compression correct or close to

we have been running 98 and testing we have had a few problems with check engine lights but have corrected them but still has airbag light on as broken clock spring on drivers side

anyways it was only boost up to 7 psi on primary and secondary which is wg pressure so we changed to the manual in gaurd solenoid and checked all the lines and they were correct the only problem is now we get boost and and it goes up to 16psi on primary and then when it goes to change over it changes and boosts up to 10psi then just cuts out and we get code 66 Twin turbo system but if u dont go WOT when it chnages it boost to 12 psi fine

we know everything works properly as before he chnaged the car over to manual with parts from his old manual b4 that he crashed it went fine

is it worth trying to use another black box to see if that is the problem has anybody experienced that before?

[gtlegacy]

ok so have lived with this problem for the last couple of months

now when i boost i only get wastegate pressure 7psi in all gears all rpm even after switch over

we have changed everything we can think of

pressure defferential sensor

boost solenoid

Black box

bovs primary and secondary

ecu

have gone through all the lines over and over again

have also tried bov line straight from intake manifold and bov line teed how it goes from factory

today we tried to free boost the car to see the solenoid was actually working at all so we jst pulled the tee out of the line and left it

went for a small drive and only up to 7 psi and cut out after switch over shouldnt it free boost?

also went for a drive with primary bov disconnected from vacumm source and 5psi after switch over?

does this sound like a problem with intercooler valve irexhaust valve? as this is all we havnt changed

[zarnah]

single turbo it, fixed, haha those tt's seem to have such complicated problems

[gtlegacy]

tell me about it hhaha dnt want to single turbo it he wants to sell it

[gazzy2000]

how many plugs at the ECU? i have a 2001 BH5 Twin Turbo ECU you can try if you wanted

This one has 3 plugs like v5/6 WRX

[gtlegacy]

yes it has 3 plugs we have tried a manual and an auto ecu and both do the same thing

[gazzy2000]

 gtlegacy said:

yes it has 3 plugs we have tried a manual and an auto ecu and both do the same thing

ahh yip, i have no further input then sorry ;D apart from i hate TT's

[gtlegacy]

yea would it be worth trying to chnage the exhaust flapper? if the intercooler valve doesnt do anything

[Guest]

carry out "d" check and cycle all the sloenoids this way

[gtlegacy]

yes have done this and no CEL also reset with black and green connected up to 40km and get the consistent flashing when ecu has been reset

[Guest]

sounds like a vac hose is wrong look at another b4 and go from there