Hi all this is my first evo after owning an impreza for a number of years and having trouble all ready.

I have a evo 4 jap import 96

Has a 3" stainless system from japan.

Air filter fitted with cold air feed

And a greddy profec B spec ll

Don't know what els has been done.

When I had it I looked through the boost controler at the peek it had been used which was 21 psi.
But I have been running at 14 psi and well it's no good.

10 psi 3rd gear WOT runs perfect.
11.5 psi 3rd gear WOT from 4000rpm it's stuttering misfiring and poping a little and well try to do 14 psi and you don't go anywhere fast.
The best peek I have has is 11 psi.

I have checked for air leaks, turbo pipes, coils, and all wires and can't find anything out of place.
I had a play with an focus st and lost this is how low I'm having to run it.

Also from cold to start it I have to use a tiny bit of throttle as it won't start otherwise after 40 secs it's ok but does hunt a tiny bit now and then. It has had the idal control valve changed but no change.

Any help welcome and anyone near Dudley welcome to look as I am really stuck now.

 

Based on what you said, I am not sure anyone can determine if it is a tune or a mechanical issue. I do not know where Dudley is, but suggest you find a reputable evo shop for help. Sorry I can not help more.

 

Check the spark plugs gap again.
And yeah. Where in the world is Dudley?