I'll have to keep and eye on this now I'm back running stock ECU as I have the Apexi cat and an AutoExe cat back. Still running the standard downpipe so hoping it will be ok.If on the stock ecu, even a high flow cat will likely cause you issues.
I've still got my old CAT in the shed, you're welcome to put it on your car if you wanted to?As an update to my previous post on this topic I can confirm @Ceylon is correct as usual. I have noticed that my car appears to be over boosting now that I can push it after the run in period. Stock ECU/boost control, stock airbox with K&N filter, stock downpipe, Apexi cat, AutoExe catback.
I've seen ~93kPa a couple of times on the "boost gauge". It seems to read slightly higher than the standard gauge would suggest, although it is quite hard to accurately read that. I have had one occasion where I believe I hit boost cut (103kPa peak recorded) so I avoid pushing the car hard now as I don't want to ruin my new engine!
As a temporary work around I've been thinking of fitting a restrictor plate to the exhaust in an attempt to prevent the boost creep like the Supra guys do. At least until I can upgrade the fueling/ECU to deal with higher than standard boost pressures anyway.
Anyone else fitted a restrictor plate/is it worth it/what size orifice did you use?
Mate, gimme your address and ill send you a 3" restrictor plate which will do that for postage.Only reason I want one is to create more restriction in the exhaust so I'm not over boosting on the stock ecu. Im currently building the car back up to stock, it's is straight piped currently by the previous owner probably why the engine went pop.
If you wouldn't mind measuring it I'd be interested to know the size of the hole. I've cut out the outside shape using a gasket as a template but I'm not sure how small to make the central hole, don't want to restrict the flow too much.If you want it gimme a shout and ill measure it exactly and send you a pic. Im not bothered about any money for it as it was gonna get binned anyway