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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
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Originally Posted by thechiller View Post
if i go for a EFI system like this will it be recommended to go with or without dump valve?

Hej Kjell!

Good work on water/air intercooler! You are one of few that pulled the installation, congratulations!

If installing EFI, I certainly recomend using som sort of BOV as it's function is to protect turbo from pressure surges and doesn't have much to do with fuel system. With other words, you need BOV regardless of which fuel system is being used.

If hunting for power, I recomend using Carrera plenum as it flows much better than OEM 930 plenum. It takes more place in engine compartment but as you are using water/air intercooler, place probably won't be the problem in this case. Note that Carrera plenum and 930 heads won't port-match and certain head work must be done. There is info and pictures about that in the forum archives.

OEM plenum is compromise so they could fit the intercooler. It flows badly and has uneven flows to cylinders.

For 550hp you would probably need to ditch KKK turbo (HF or not) and go Garrett, CIS will need to go as well.

The big radiator in front, is it oil cooler or cooler for water/air heat exchanger? If it's used for heat exchanger, it's fairly overbuilt. Heat that needs to be cooled by water/air exchanger isn't so big.

Good thing with water/air is that you can problably route a part of water return trough eventual Garrett turbocharger water-mantle an thus solve usual Garrett watercooling dilemma without extra hardware.

Best regars.
Thank you for your time,
Old 06-21-2008, 12:00 PM
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