So, what would it take to twin turbo my 3.6L engine? Options

[SirAndy]

What would it take to twin turbo my 3.6L engine?
There's a few obvious changes, but my guess is there's a lot more to it.

Could any of the newer factory setups be adapted to fit my engine?
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[Andyrew]

So you wouldnt mind plopping down 15k and gaining 150hp?

When I bought my turbo for my Audi, I made a goal of spool, I wanted FULL spool by 3800 rpm. On my previous turbo I had full spool by 2700 rpm and in honesty it spooled to quickly. I would simply want to merge or drive a LITTLE quickly and it would just spool ridiculously quick. Keep in mind it being a 1.8L it doesnt have much daily driving tq below 2k so I would typically drive it 2500-3500. What I came up with was something that with the wastegate open as much as possible, will start making SOME boost ~ 2k and just keep pushing it up till its making full boost (at the moment) at 4k, which is 10psi (When I have my tuning software I'll adjust fuel trims and timing and close the wastegate more, which will decrease spool time. At that point the max i'll run is 30psi on race gas). Then it just pulls harder and harder till my ECU cuts at 7.2k, however I know this turbo will push me well into 8k rpms and still be within its efficiency.

If you REALLY dont care about the money, and you want twins.. your best bet would probably be a pair of GT2560's. This was what I had previously on my 1.8L, but in single form. It was the perfect match for my engine and it gave me an incredible spool factor but also pulled STRONG all the way to redline, Spool was literally instantaneous above 3500. Since you have twice the displacement, that should scale up. The 2.7L audi guys run them when they want 600+whp. You could even go a pair of GT28r's if you wanted more of a linear power band and not a big tq spike down low (This is the issue with small turbo's).

However if it was my money, I would make some calls to some of the turbo builders (034 motorsports is in your area, they do good work and have a dyno). And ask them what they think. I would think a nice GT35R or GT40 sized turbo (Comp turbo, precision, turbonetics are also good turbo's and have more advanced internals than the 20 year old Garrets) would work well. Heck with that size of an engine you could probably go journal bearing and cut your cost in half. A nice large Holset turbo off a diesel is what the cheap guys use when they want a factory reliable and big turbo for making big power..

[Rand]

So you wouldnt mind plopping down 15k and gaining 150hp?

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No, I think Andy just wants to think, hear, and talk about all kinds of options before deciding on his goals. Makes for an interesting thread.
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