I still don't get it really

If you send half of each exhaust port to each turbo surely you are lowering the pressure driving each turbo - when the small turbo is trying to spool half of it's "driving" exhaust gases will be wasted to the big turbo

Scuderia emailed on diesel compounding turbo's for 60psi + plus boost which is the exhaust of the first turbo feeding the second turbo used on US tractor pull and race trucks. One turbo feeding it's outlet of intake air sraight into the "front cover" of the next turbo which compresses it again to make very hi boost levels.

or maybe he is planning a valve system like the supra OE

http://www.max-boost.co.uk/max-boost/supra/turbo.htm

Who says they are 2 different size turbos's, they look the same size to me, i cant see it working very well running one turbo into the next turbo, its probably a simplified version of what lancia did in the late eighties with the ecv triflux engine

look here

http://farm4.static.flickr.com/3221/2679058841_0196f9e5ce_m.jpg

I believe the 2 turbos are the same size also. Twin turbos in parallel will always get half or a percentage of the exhaust flow each. 2 turbos in parallel is just like running a single larger turbo, there are no performance benefit.

Non sequential, twin parallel turbo setups are used by manufacturers for nothing other than space and packaging restraints. It makes common sense. More or less power has nothing to do with it. Twin parallel turbos on an I4 engine is really just for show.

I agree running #1&4 into one turbo and #2&3 into the other would be a better system that having in effect 2 seperate 4 branch headers, one for each turbo

Twin turbo in parallel on inline engines has been used by Nissan and BMW for example. As did some version of the Supra and Volvo also used it.

It's meant to reduce lag. Two Turbo's spool up faster than one (inertia of the larger blades). Albeit marginally.

Bringing up an old thread!!!

What a monster!!

http://farm4.static.flickr.com/3221/2679058841_0196f9e5ce_m.jpg it was a strange idea http://www.ecv1.com/e-motore.htm

1 little turbo for low down revs and torque and a big 1 for higher revs and even more torque just like the 3.0 twin turbo BMW 535d

i remember this post i wonder if theres been any vids yet

It is very hard to achieve that sequential boost pattern properly, and when you start to run high boost the transition between the turbos is a nightmare. I would never even consider trying to get that to work if you were designing the system from scratch.

Single turbo is the way to go - Simpler and less to go wrong, more space in the engine bay etc. I can't think of one highly tuned car that used / uses sequential turbos...

Anything new about this thread?

Any one seen anything new on this?

nothing Gian... must be some where in the world...
not a lot comes up in a google search..