Hey,

Basically...I'm running stock twins with a full exhaust. I have all the reliability mods & a PFC etc. Yes I know that my motor will blow if I boot it. I'm not boosting it. I cannot justify the cost of a cat for only a few months as I'm going single turbo in the very near future.

What I was thinking for a temporary fix:
Fitting a exhaust gasket/restrictor plate between the midpipe and the backbox (80mm exhaust).

My question is, will this create enough back pressure to allow me to boost my car? Also..What internal diameter should I use for the plate? The car over boosts to ~1.1bar in its current state, waaay to high. I would like to drop that to around 0.9bar. My thought was 70mm internal diameter.

Any advice/suggetions would be very much appreciated

Thanks!

Ceylon.

 

Most exhaust piping (not catback) is typically 3" for the FD3S. Most people either use a 2.75" or 2.5" restrictor to control boost. So 70mm or 64mm. If you are going to make one, make both sizes and use whatever works. Start with the 70mm. If that doesn't work, then use the 64mm.

 

Thanks for that Mahjik!

Its much appreciated

Regards

Ceylon.

 

guys can anyone show me or tell me what you guys use to make the plate with.. does it like have to have any sort of seam or anything to seal... ???

@mahjik.. so using the restrictor plate between midpipe and catback is ok right ??? ive got a profec type s and planning to take the cat out.. do you think restrictor will be able to control that... ??