Need advice on intake and intercooler for a 965 EFI

[moparrob]

Thanks in advance for you input.

My starting point is I have a 1994 3.6 965 (964 turbo) long block that has been fully rebuilt with Pauter rods, dual plugged heads, and GT2 Evo cams from Web Cam. I also have a Motec 130 ECU I plan on running, full sequential, with coil on plug ignition. I have not chosen the turbo yet, though. This will all be installed in a '78 SC widebody with a shortened G50.

Currently installed is a single turbo GMH heat exchanger setup, with individual thermocouples installed in each exhaust runner. I also have the Motec CAN interface for these.





I am at the point where I need to decide what type of intake setup I want to use. I have done a bit of internet research, but I am still undecided. Although the engine is built for serious power, I have no intentions of racing the car and I am looking more for longevity on the 91 octane that is available locally. (Truth be told, I probably would have been fine with a mild 3.3 build, but this is what I had to start with.)

Since I am going with EFI, I see there a few options available. It seems as though the 3.3 manifolds will require the EFI conversion adapters, such as those offered by Turbo Kraft, as I will not be using CIS any longer.





The real issue seems to be which manifold and intercooler setup to use. My goal is to find a solution that is not overly complex, is easy to service if necessary, and is not exorbitantly expensive.

One other thing, I want to keep the AC compressor if that matters.

I have seen people using stock 3.2 intakes, flipped 3.2 intakes, and stock 3.3 intakes in this situation. I also note there are long neck, and short neck intercoolers, but am not sure what size or configuration I would need (full bay, or stock size).

Any input on what others have decided upon, and the pros and cons of your solutions, would be greatly appreciated.

Also, if anyone has a complete system that would work with my 3.6 heads, from which they intend to upgrade from or sell, I would be interested to learn more.

Thanks.

[dos531]

Not sure about the compatibility with 3.6 heads, but the 3.2 carrera intake makes the efi conversion pretty simple and has been shown to make good power. Im using the entire 3.2 fuel system minus injectors. FPR, fuel rails, lines, throttle body, iac etc. Easy and looks factory, because it is.

[moparrob]

I see that there are also adapters made for my 2 bolt 965 heads to use a 964 manifold. Has anyone tried this in a turbo application and if so, what style intercooler would adapt. Is this more difficult than using a 3.2 manifold?





This might be nice with a Bosch 74mm electronic throttle body to go throttle by wire. Seems like it would also avoid the need to plumb in an idle air controller.

[dos531]

IIRC the height of the plastic 964 manifold meant a smaller intercooler had to be used.

[David]

I don't know the 965 3.6 to have advice but I am wondering what the 3.6 port size and bolt pattern is. I assume it's larger than the 3.3 turbo heads.