tomatoto

Hi

I just installed a High Flow Cat and tested the car this morning. Everything was fine, except a little boost creep (I don't know exactly how to notice it, but I usually have 10psi in WOT, today it may have reached 12psi). After 15 minutes and some boosts, I was in WOT when I suddently lost all pressure. After this "thing" happened, I immediately stopped the car, it was idling well. I took a look and everything looked ok (all visible hoses still connected). But impossible to use the turbos again, it kept stuck at 0psi when WOT.
I thought it may be a limp mode or something, So I eventually stopped the car and the engine off for a couple minutes, and start it again. The same.
What can it be ? Wastegate stuck open ? a charge control/relief problem ?
I will check all the vacuum hoses under there soon, but if you can help me looking in the right direction, I'd appreciate

My setup : PFC (not mapped yet), Greddy SMIC, DP 80mm, Pettitracing HF Cat, RacingBeat dual tip CB.

alexdimen

iTrader: (13)

Could have popped a charge pipe off or ruptured a coupling on the bottom of the SMIC or Y-pipe.

tomatoto

Ok, problem solved, thanks to arghx on another post. (and thanks alexdimen too,you got it as well !)
The coupler from the turbo to the IC was simply unplugged.




btw, it's slightly wet (from gas) in those couplers and since it's slightly smelling gas inside the car after boosting, I guess it's not normal. I've read on another post that it may be caused by a bad atomization lines connection to the LIM. So I must check it soon.

alexdimen

iTrader: (13)

Nice.

BTW I doubt you have uncontrollable creep with just a hf cat. Probably just need to adjust the PFC settings. You can probably reduce the boost by decreasing the WG and PC duty % in the commander under turbo settings. Lower duty means lower boost because the solenoid will be venting less boost pressure and the actuator will see more. I have had to change the settings after pretty much any mod I've done to the intake/exhaust to maintain the same boost levels.

Something else I learned is the boost setting doesn't really control the boost it is more of a target. Control is done mainly by the duty %. The boost setting is used as a basis for overboost fuel cut. For that reason you shouldn't have the boost setting much lower than what your target / actual boost is.

tomatoto

Alright, I took a quick look in the menus this morning but I didn't know how to adjust this in the PFC. thank you very much for those tips !
I will have the car mapped soon by a pro, so I guess he will help me manage this too.

Natey

iTrader: (19)

PFCs are cool to putt around with no map, but be careful stomping on the gas until you get it tuned.

Maybe that coupler was telling you something. No 12psi WOT runs until you're mapped and set!

tomatoto

yes Sir !
I never wanted to go beyond 10psi (even after mapping) and I thought I'd be wise enough to avoid doing it before I get mapped.... but, .. yep, temptations are so big sometimes ^^
Anyway, the coupler lesson is well learned now !