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Oh dear

Yes, though the overboost function will have been removed with the chipset, i would certainly get a boost guage on there to see what it is producing as too much = BANG !
 
Always difficult to diagnose something like this over a forum, but if you have been turning up the boost to compensate a leak I suggest you turn it back down now the leak is fixed.

Could the stuttering and shaking be knock or pre ignition? Both of these can kill an engine very quickly.

It would be a good idea to get the boost level set up again safely on a rolling road where the AFR can be measured against the boost level.
 
Hmmm


I have both gauges, problem comes in around 15 psi and my afr reads about 12:5 whereas previously it was about 13:5.
 
Now running richer on boost which is fine, 11's is what you need AFR on 18 psi, have you treat her to some new plugs lately, possibly ignition, my car had not been doing too much in the way of miles lately, took her out about 2 weeks ago and gave it some beans when nice and warm, bit of a bang from the back end 9exhaust noise) when coming off boost.
Has been tickety boo after some fresh fuel and miles.
 
Plugs dizzy cap and rotor are three years old and Its currently got some 99 ron in the tank. Googling the problem is doesn't sound unlike a knock type fault. I have ordered a new sensor for good measure and will test and check the wiring to the original at the weekend.

As it was running rich I will clean up the plugs and my wideband sensor and give it a general good look over, hopefully its something simple as i'm running out of time before Rutland.
 
The hole is fixed with some expoy metal.
Click to expand...

Probably OK, but I'd be wondering if that material could ever enter the pipe, the engine would not appreciate it.

It wont go wrong on boost anyway with all that positive pressure. [:)]

George
944t





 
There's a big pudge of it on the back of the hole to make sure it does not happen. Its really quite good stuff as I used it to repair the seated area of a wheel nut when I had to drill one off another car.
 
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