[SCOTTJ]

Hi,

I Don't post much because my 2007 FQ360MR has never had an issue in two years till last couple of week. Now and again i could feel the car hold back under hard boost. Last night this increased to quite bad loss of boost when i really booted it. By the time i'd driven the 20-30 miles back up the A5 I could not use any boost and could hear serious amounts of air escaping under the bonnet. I limped home by 3am fearing the worst and not wanting to use any turbo...

This morning i stripped all the undertray, and using hose pipe to my ear tracked it down to a broken rusty joint on something i've not mananged to pinpoint what it is. Its located next to the battery and air intake at end of pentium chamber on right end of cylinder block. I think it bleeds off boost pressure when the engine is cold but i have no idea what it is called!!! There is a metal bendy tube passing from the top of the exhaust manifold to the vaccume unit (I think this transfers heat to a bimetal strip in the broken valve. Their is a pipe from the feed into the pentium chamber that connects to the bottom of the unit. Where it connects the L shaped metal has rotted inside and it has broken off the bottom of the unit.

What is this? is it a common fault being it will rust internally? Are there any after market ones? I don't like thought of rusty bits of metal entering engine. For now i have pushed a 1 inch round piece of wooden broom handle in the rubber tube from the pressurised inlet tube so i am not loosing boost pressure. (For now at cold i am not going to use boost as i belive possibly this is what it is for)

Any pointer to what to look for to buy or a quick fix would be appreciated.

Cheers

Scott

 

[ant1]

Can you take a picture? Sounds like the DV or the Upper Intercooler pipe.

 

[SCOTTJ]

I'll go have a go! Tad dark...

 

[TerryA]

the bendy pipe is part of the SAS system - do a search loads written on it - a lot of people remove it completely as it doesn't do much and the engine will run OK without it. To block off the bit I think you have stuck a broom handle in get a rubber end cap off a walking stick - that goes over the pipe take off and secure it with a jubilee -

This is my 6 GSR with SAS removed and bit I think you are talking about capped - 6 to a 9 will be very differant but you can get the idea ?

 

[SCOTTJ]

Heres the valve thingy... U can see black rubber tube exiting underneath of ally inlet tube...



Heres the L shaped pipe thats broke off



Click to enlarge (Hopefully!)

 

[SCOTTJ]

SAS System I will have a read! Sounds like some weight saving is in order! I'll get a price from eBay/Mitsubishi n compare that to a rubber end off a walking stick in see which wins! Thanks Terry

 

[SCOTTJ]

Can't understand why Mitsubishi went to the trouble of developing it. Quote a post from JOUNGSYR

"Most of the Evo VI to IXs have a road going version of anti-lag fitted to them called a Secondary Air System. Essentially it diverts air from the intercooler side of the throttle body to the exhaust manifold to help spin the turbo when the throttle is shut.

In standard form it has a very minimal effect and people have removed it without noticing any difference."

Does sound like it should make some difference though... Still not sure what to do, bearing in mind i have totally standard ECU program and can't take advantage of the additonal boost pressure while throttle butterfly is closed.