aXeL

Something I keep pondering, having had a twin turbo GTO years ago.

Assuming this is for a newage 2.0 or a newer 2.5

1) Say I were to acquire a couple of identical turbos, e.g. ported TD04s or a pair of some other fast spooling units.

2) I mount the turbos close together, maybe one above the other as close to the stock position as possible.

3) I have access to a facility to produce any stainless steel pipework I require, e.g. has recently manufactured a custom spec ported venturi up-pipe for me.

4) I have custom pipework made to fork the up-pipe and downpipe assemblies. A forked up-pipe would receive less air per fork so it may require a restriction to speed the flow and aid spool but not so restrictive that both forks flow less air than a single up-pipe.

5) I have custom pipework made to fork the turbo inlets and combine the intercooler y-pipes.

6) I split the turbo oil feeds and re-combine the outlets

7) I split the feeds to the wastegate actuators.

8) I modify the induction for a suitable high flowing variant.

9) I create a new boost map, WGDC and IWDC maps (and adjust AFRs, timing accordingly)

I could in theory end up with a fast spooling configuration which also flows twice as much air.

What do we think? I know this has been done on NAISOC.

I was thinking twin turbo as opposed to bi-turbo as the standard ECU would use the same map to control both.

Having said that, would a bi-turbo configuration be possible, e.g. mount my VF35 ahead of my MD321T? Obviously I'd need an ECU that could run multiple boost, WGDC, IWGDC etc maps independently. I would love to try this if I though it was remotely feasible! Although I am about to sell the 35 and I'd probably use something small anyway.

of course I could just stroke the engine but where would the fun be in trying?!

Tazman861

iTrader: (2)

Transplant a legacy twin turbo engine or use as a basis for a rebuild??

aXeL

True, be about as interesting experiment as an engine swap though wouldn't it, i.e. probably not much?

Tazman861

iTrader: (2)

But why re-invent the wheel? all of the awkward bits have already been made. as I suggest, use them as a basis for upgrade not just chuck it in as is.

TonyBurns

iTrader: (3)

There is no real need anymore to use twin turbo's on 4 pot engines, the legacy twin turbo had its flat spots between the TD04 and the TD05 hand over, and with modern turbo technology (twin scroll etc) your turbo will outperform a 4 pot twin turbo (and wasnt the GTO one turbo per bank anyway? not exactly possible on a 4 pot engine )

Tony

dunx

iTrader: (3)

My thoughts exactly !

Tribeca 3.6 motor plus two TD04's = 600 bhp. Easy !

Simples !

dunx

P.S. More seriously, you'd need two smaller turbos to ONLY make around 400 bhp without awful lag, unless you used external wastegates to "block" one at low revs ? ? ?

aXeL

Isn't that a bit of a big heavy motor - for an Impreza?