Biturbo Project

No different to sticking your foot over your exhaust pipe.

EXACTLY. And you get the "phut phut phut noise of an exhaust leak when you do that...

I don't get to hear many leaky exhausts, but you don't get that if you put your hands over both tailpipes on a Z7U.. or most turbo engines..

Heres an audio clip of the unit in operation, fully open at the beginning, then they semi close at 30 seconds in..

http://www.alpinerenaulttuning.co.uk/exvalve.wma

I don't get to hear many leaky exhausts,

You're lucky. 2 studs per port instead of four and a stupid link pipe with almost no flex in it....

Gearbox is going off to one of the famous UN1 bods, (not mentioning names as its a non-warrantied build). Started off with a low milage atmo box, short 4th and 5th gear ratios, gears cryo'd and fitted with a short ratio 3.89 final drive. Its not going to do great top end, but should be very swift in each gear and less overall load on the box, I hope...

Going to fit a remote filler for the box too, as discussed in another thread.

you might want to make provisions for a trans cooler, directing the cool oil at the second gear.

Don't think ill be in second gear too long...

This is quite interesting Dave, where are you up to now?

This is quite interesting Dave, where are you up to now?

Ah, I sold all my parts to a Dutch guy, turbo's, manifolds, link pipes etc..

Flying Dutchman