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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Yes, you should lower the compression ratio. You can do this by having the piston domes machined or buying a set of custom J&E pistons..

If you stay under about 11/1 effective compression ratio under boost (somthing like .8 bar with 8/1 compression), your ignition side should be ok with knock sensing.

The challenge is the fuel side. You will need to relocate the hot wire air flow sensor to before the turbos as any oil from them might kill it. You will probably need larger injectors or a Raising Rate Fuel Pressure Regulator. Then you will need a custom chip to support your build. Try 911CHIPS.com or Protomotive. Otherwise you will need a custom aftermarket programmable EFI system. Another possibility is to use a UniChip piggy back system to fine tune things.

You might want a larger MAF sensor than stock.

That on top of your typical turbo, exhaust, and inter cooling plumbing.

Never done it so this is mostly an educated guess.

Last edited by 911st; 03-25-2010 at 08:19 PM..
Old 03-25-2010, 08:03 PM
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