My car(protuned) and even with the earlier ots map does that puh puh from exhaust. Same for the dipping idle. My idle dip got worse after tgv delete and protune. Never stalls but comes very close a few times before out of cold start. Seems to be pretty normal stuff for our cars. The preturbo exhaust leak will likely cause more afterfire between shifts since it will cause erratic rich than lean conditions. For your header leak, have you tried a fresh gasket smeared with 22B exhaust gasket(red tube) sealer? I use it around all my tbe flanges.

The AP can only read to -10 vacuum. A real boost gauge reads like -20 at idle.

 

My car(protuned) and even with the earlier ots map does that puh puh from exhaust. Same for the dipping idle. My idle dip got worse after tgv delete and protune. Never stalls but comes very close a few times before out of cold start. Seems to be pretty normal stuff for our cars. The preturbo exhaust leak will likely cause more afterfire between shifts since it will cause erratic rich than lean conditions. For your header leak, have you tried a fresh gasket smeared with 22B exhaust gasket(red tube) sealer? I use it around all my tbe flanges.

Thanks for the response. I have tried everything for the header leak and have kept track of it here: http://www.iwsti.com/forums/engine-...ms/engine-power-performance/131449-maddad-headers-leaking-need-gasket-help.html

I will say when I used the graphite gasket and revved the engine it didnt afterfire anymore. I assume because the leak was sealed until I did a few pulls with the car and demolished the gasket. So it makes sense the leak is causing the afterfire. I dont ever remember having this "puh" sound before though and it has me concerned.

I am ditching the maddads and going back to a PnP stock with Grimmspeed UP/Xpipe and all brand new OEM gaskets, most likely this coming weekend as long as all the parts get here in time.

 

You've got a good bit of mods done. You should really consider getting a wideband gauge. it has saved me a few times when hoses and lines have popped off or a leak somewhere developed.

 

I can look into it, but wont be able to afford it for a while. I just dumped a bunch of money into this header issue and just got my Boost and Oil Pressure gauge last week.

 

Seriously, look into it with intent. A VERY important gauge.

 

Bump for you daytime guys..

Any ideas on the "puh" sound and vibration?

 

Ive seen that with long intakes and idling the car...i guess its lack of air when idling. I have a buddy with a ver4 in his GF and hes got pre-turbo leaks it doesnt stutter but it backfires (for lack of better term) between hard shifts. He doesnt have gauges yet but you can tell hes not got enough boost. I dont know if that gives you any insight, the pops in your exhaust in shifts are propbably due to the leak and like someone said due to the car running rich and the stuttering i would thing again is due to the leak because the cars not pushing enough air into the motor and it kinda wants to stall.

It def sounds frustrating when you have to swap headers, x-pipe up pipe out and hope thats your problem

 

a preturbo doesn't cause a misfire. you would throw a code for a misfire...an air leak will cause a misfire though.

the idling is normal for subarus, they always dip around and is actually more related to the tuning. i know my car did it and after doug and chris tuned it, it was gone and was steady at 1000rpm all the time.

aside from the maddad leak, the stumbling can be a tuning issue. if you had a leak somewhere, the computer would find it, even if it's the tiniest of hoses that is popped off. check all the hoses and check that silly little circle thing that is to the right of the turbo inlet in front of the manifold..those little hoses seem to find their way off sometimes.