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jons911 jons911 is offline
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Join Date: Oct 2015
Location: Jacksonville, FL
Posts: 128
Need suggestions for finishing design on 911SC twin turbo conversion

I'm in the design phase for a hot rod build and would like some input. It won't be for a while, but it keeps me occupied. But more importantly I tend to just plow through projects once I start, which means initial planning is important for a project of this scale so that I can have it ready to go and just dive in.

The current setup I had in mind:
-Twin Turbo setup
-Rebuilt '78-'79 SC motor with 100mm Nickies/JE pistons (3.3l engine)
-EFI and twin plug
-Zork tubes with a 2 into 1 on the waste gate to give the 917 exhaust look

Typical driving:
-Mostly for fun on the weekends and ripping through back roads
-A handful of track days

The goal:
-400hp at the engine
-Good mid range (3k to 5.5k) with the ability to rev decently high (I would sacrifice some mid range performance for top end, but not all of it)

Advice needed:
-Cam profile (also for just good mid range, and just top end performance running between ~5k and ~8k)
-Boost level and compression ratio
-Is 8k red line realistic for this short stroke design
-Is short stroke ok, or should I instead go longer stroke and smaller bore

I'll state this now, I'm new to turbo charging. I've tried to read quite a bit, but obviously that is limited when it comes to designing specific setups. Any tips and suggestions are most welcome. If I'm way off base, just say so. That way I can step back and rethink things and come up with a more suitable setup or more appropriate goals.

'79 Copper 911 SC
'88 911 Carrera
Old 02-20-2017, 05:32 PM
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