Compound turbo?
inside out
Engine>intake manifold> 8psi turbo > injector > intercooler > bigger turbo?

Probably a lot of buggering around.

I'd love to try it some day, but too much work for an experiment on a stock A12 for me!

Fair enough, I'd also like to try it but time is not my friend at the moment....

Just swapped the R32 bush bearing turbo with the steel wheel upgrade to the slightly larger R34 ball bearing turbo. I'll fire it up later today with everything else the same to see what difference it makes.

It probably will make very little difference to power with the other current restrictions, but will be interesting to see where it comes on. I'm hoping its about the same or even a touch earlier, but probably not.

Just back inside after trying the larger BB turbo. It didn't make 15Psi until 4800 rpm compared to 4200 with the smaller turbo.

190Nm at 5500, 120Kw at 6200 and 22 Psi

That's now 4 times what the same engine made on the stand with the original carby. Good times! would be a bit slow getting going on the road though!

If nothing else Simon this is great information for any further improvements to my poxy 140 h.power out of the bog stock engine in mine

Gold Bert, the advantage I have is that I paid $56 for this engine and feel like I can push the timing and boost to the edge just to see what happens!
The E85 does give me confidence. The air inlet temps only get to 45 degC in the manifold at 22Psi non intercooled.

With those numbers i think i'll jam some big injectors in and crank the boost to 20 psi,based on what your results are it'll still be safe as houses lol

That's the go! I cant remember if your engine is an A12 or A15. Don't be scared of 20Psi if you are using E85 on an A12. I'd be more cautious if its an A15.
Double check your ECU timing table is actually what the engine is getting. Then at 20Psi start with timing around 23 degrees. you might be able to go up a couple from here. This engine is at 26Deg till 5500(peak tq) then i've tapered up to 29 at 7000. That's where MBT (minimum timing for best torque) ended up on this engine. Every engine will be different so let the dyno guide you on this.

If your engine shifts more air than a stock A12, The timing numbers probably will have to be less than mine because it will be making more power at a given boost(higher average cylinder pressure).
That's why I recommend the lower starting timing figure.

One other thing to be aware of.. If you have overlap on your cam, be a little careful about exhaust pressure going higher than inlet pressure. All sorts of problems arise from this. Inlet charge contamination, higher risk of detonation and pre-igntion and rapidly falling power! The last thing you need is too much timing if you get to this point.

Thanks Simon,as always good info,and it's an A12