I have a MY96 STI RA and here's my prob.

I was joining a dual carriageway just of a roundabout when this MX5 pulled up right behind me pushing right up my ****, so I thought ok just alittle faster then, so I put my foot down within speed limits of course in 3rd gear rev's at about 3800rpm when the turbo kicked in but then it was sluggish and you could hear a low sounding whistle. So I went upto 5300rpm and changed gear but again no change it just felt like it was running on normal engine power which also felt sluggish, so i took it easy after that and drove home very carefully.

The car has no major mod's just a blitz ADV and a Ninja exhaust, also it has a knocklink which only lit up the first light when this happened.

Any idea guy's what could be causing this.

Cheers
Mat

 

Check main intercooler hose hasnt come off / worked loose. Check also the jubile clips that hold it in place are tight.

Good Luck!

 

You don't have a boost gauge then...? Would be interested to know what boost it was developing at the point of the fault. As SFG says, it definitely sounds like a blown hose/leak somewhere...