boosted

Running at 20g on my ej205, mapping has been going well upto .7 bar boost. Now that I have turned the boost upto 1.0 bar I think I'm experiencing surge.
Not 100% convinced though.
Car will come on boost by 3100, then start to pull, around 4-5000 it will jerk and hold back, then clear and pull cleanly to redline.
AFR good, timing good.
Can't hear an surge, but a do have std airbox.
What's everyone's thoughts?

ScottyPPP

What's the boost doing at that point? Is it flicking about?

boosted

Yeah man.
Although I think I may have more than one problem as it does it even at .7 bar, not sure yet

ScottyPPP

Intake pipe?

boosted

Silicon one yep. But it shouldn't surge at half a bar surley

bengo

iTrader: (17)

What wastegate are you running and have you fitted a 3 port bcs?

boosted

Running a 24mm internal wastegate, I have a homemade manual boost controller on just now.
Fixed one of the problems, ignition setting, not the dwell but the spark time, increased it to 2.0 MS, seems to have completely stopped the "comming and going" through the revs.
However I can make it surge at 1.0 bar boost circa 3500 rpm...
Defiantly surging!
Not planning on keeping this turbo on for much longer anyway as I have something a bit special for it, I'll see if I can map some more boost up the revs a bit so I can at least run the 1/4 mile with this turbo

bengo

iTrader: (17)

Are you running Carberry by any chance?

boosted

What's that?
I'm using MS2 ecu