Aaron's ! Me and 3 other guys here have the same prob as you (#3) ...
when the turbo push more than 9psi, up to 10psi (the more close we are from 10psi, the more "lag" or hesitation we experience) starting at 4000k, the car seems to be pulled back... blocked..
If i run under 9psi (dont go over 8psi) there is no problem at all
I did a Compression test on the engine, 150psi all around..
I did a "injector cleanup" (last resort)... no changes...
We have realy no ideas of what the problem is, since we are no experts..
Things i have in mind :
1- Lack of gaz ? on my Air/Fuel gauge there is almost always 2 leds Orange 2 Leds green
2- Ignition.. bad Wires ? i checked them and they were bad.. (sparks was going from wire to wire) .. changed them, nothing changed.
3- Ignition .. Plugs ? I have Bosh Platinum H4 in the car, seems that those are crap for performance... i will change them for standard ones, or the "iridium" ones... Is the gap on those are too big ?? spark not powerfull or fast enought ?
4- MAF or O2 sensor problem ? O2 not working well ? there again i should be able to read a bad mixture on my Air/Fuel Gauge ?
5- Ecu shutting off the gaz ? It should be more brutal that just that "hezitation" we feel ?
6- Blocked Cat con ? maybe it cannot flow the air at 9psi+++ and that's what causing the problem... i am getting a full TurboBack exaust no cat, 3"downpipe, 2.5" reso+muffler+line in 1-2 months...
7- I'm out of ideas... we realy need expert help
Thanks for posting any developpement concerning this MAJOR problem
![Smile :)](./images/smilies/icon_smile.gif)
as I will do if i find something.