AFR is air to fuel ratio. eg 12 parts air to 1 part fuel is 12AFR. Innovate products are good value for money and they can be calibrated to give accurate results.

Running your 0.95bar spring will cause your engine to overboost due to how efficient the K27HFS is. Run a lower spring pressure and see what boost level you get. You will need an aftermarket gauge to check your boost pressure. You don't actually need a Tial wastegate but there is an excellent choice of springs to choose from. I went with a .5bar spring with my Tial and will make up the additional boost pressure with my electronic boost controller.

You can get all these gadgets from imagineauto.

EDITED: I wrote .05 bar instead of .5bar

 

Maximum factory boost for a 94 is .85 bar.

Here is a link to a thread that I listed the TSB info for boost pressures.

https://rennlist.com/forums/showpost...1&postcount=10

 

thanks to you all for your input. I'll let you know how it all turns out,
cheers Graeme

 

Intermediate update.
A good mate who knows the older Porsche's inside out popped round today to give me a hand removing the turbocharger. Or should I say I gave him a hand. Well it took a while but the turbo is off. The inlet side of the impeller is mullered. We poured the oil out of the turbocharger into a plastic container and guess what, out popped the head of a cross head screw. We all know that it is impossible for it to have got there itself, or that there is anything around the top end of the engine that requires the use of a cross head screw with a 6mm head. I will leave you to draw your own conclusions as I have done, yours very dissolussioned, Graeme

 

It is VERY common for FOD damage to occur with these engines.. All it takes is someone removing the IC and having a screw or bolt dropping into the uncovered compressor outlet piping.

Again this is a very common occurance around the world, with all the 930s and 965 getting worked on..